Storm Prediction Center

WW 0408 Status Updates
STATUS REPORT ON WW 408 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 10 SSW SDY TO 25 NW GDV TO 45 SSW OLF TO 60 SSW GGW. ..KERR..06/28/26 ATTN...WFO...GGW... STATUS REPORT FOR WS 408 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC019-021-033-055-083-085-091-105-280340- MT . MONTANA COUNTIES INCLUDED ARE DANIELS DAWSON GARFIELD MCCONE RICHLAND ROOSEVELT SHERIDAN VALLEY THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0407 Status Updates
STATUS REPORT ON WW 407 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..CHALMERS..06/28/26 ATTN...WFO...BOU...LBF...CYS... STATUS REPORT FOR WS 407 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC095-115-280240- CO . COLORADO COUNTIES INCLUDED ARE PHILLIPS SEDGWICK NEC005-013-029-033-045-049-063-069-075-085-091-101-111-113-117- 123-135-165-171-280240- NE . NEBRASKA COUNTIES INCLUDED ARE ARTHUR BOX BUTTE CHASE CHEYENNE DAWES DEUEL FRONTIER GARDEN GRANT HAYES HOOKER KEITH LINCOLN LOGAN MCPHERSON MORRILL PERKINS SIOUX THOMAS THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES Read more

MD 1359 CONCERNING TORNADO WATCH 406... FOR PORTIONS OF NORTHWESTERN NEBRASKA
Mesoscale Discussion 1359 NWS Storm Prediction Center Norman OK 0756 PM CDT Sat Jun 27 2026 Areas affected...portions of northwestern Nebraska Concerning...Tornado Watch 406... Valid 280056Z - 280230Z The severe weather threat for Tornado Watch 406 continues. SUMMARY...A discrete supercell in the Nebraska Panhandle will pose a risk for all severe hazards over the next 1-2 hours. DISCUSSION...Regional radar imagery depicts an intensifying, discrete supercell located in Box Butte County, South Dakota. Latest objective analysis places this storm in an environment favorable for all severe hazards, with 4000+ J/kg MLCAPE, SHIP values of 3-4, and effective layer STP of 4-5+ noted within the inflow region. This is supported by strengthening low-level flow and increasingly curved low-level hodographs noted within the LNX VWP, with 40+ kts of southerly flow sampled at 1 km AGL and 0-500 m SRH approaching 200 m2/s2. While modest capping/inhibition remains in this environment, strong dynamical lifting within the mesocyclone should continue to overcome this inhibition for at least another 1-2 hours as it progresses eastward across northwestern Nebraska. ..Chalmers.. 06/28/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LBF...CYS... LAT...LON 42550293 42710262 42800199 42700141 42420126 42060159 41980219 42100291 42320304 42550293 MOST PROBABLE PEAK TORNADO INTENSITY...100-125 MPH MOST PROBABLE PEAK WIND GUST...65-80 MPH MOST PROBABLE PEAK HAIL SIZE...2.00-3.50 IN Read more

MD 1358 CONCERNING TORNADO AND SEVERE THUNDERSTORM WATCHES 406...407... FOR PORTIONS OF SOUTHWESTERN SOUTH DAKOTA INTO THE NEBRASKA PANHANDLE
Mesoscale Discussion 1358 NWS Storm Prediction Center Norman OK 0710 PM CDT Sat Jun 27 2026 Areas affected...portions of southwestern South Dakota into the Nebraska Panhandle Concerning...Tornado and Severe Thunderstorm Watches 406...407... Valid 280010Z - 280145Z The severe weather threat for Tornado and Severe Thunderstorm Watches 406, 407 continues. SUMMARY...Isolated to widely scattered convection continues to pose a risk for primarily large hail and damaging wind gusts. DISCUSSION...Isolated to widely scattered supercells have developed across far southwestern South Dakota and northwestern Nebraska as of 2350 UTC to the west of a diffuse dryline. In the near-term, the primary risk associated with this convection will be large to very large hail (perhaps to 2.5+ inches in diameter) given strong effective shear, elongated hodographs, and ample buoyancy within the hail growth zone (as supported by SHIP values ranging form 1-3+ per latest objective analysis). Recent high-res guidance and regional radar imagery suggest that rapid upscale growth may occur with the ongoing convection across southwestern South Dakota, which would favor a transition towards damaging/severe wind gusts as the primary risk. Farther south, ongoing convection is likely to remain more isolated within the Nebraska Panhandle, with large to very large hail and damaging wind gusts being possible with supercells. Additional development farther south into southwestern Nebraska remains uncertain at this time. Some increase in tornado potential may occur with time and as convection progresses eastward given greater moisture to the east of the diffuse dryline and a strengthening nocturnal low-level jet that will yield increasingly clockwise-curved low-level hodographs. A more linear storm mode and greater convective inhibition/capping to the east of the dryline lend uncertainty to the magnitude of the tornado risk, however. The greatest risk for a tornado is likely to occur with any discrete supercell that can persist farther east into this evening. ..Chalmers.. 06/28/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LBF...UNR...BOU...CYS... LAT...LON 42850344 43350333 44010309 44450267 44570214 44510176 44290145 43770139 42630136 41790140 41220147 40990164 40850201 40800247 41030294 41680332 42170338 42850344 MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH MOST PROBABLE PEAK WIND GUST...65-80 MPH MOST PROBABLE PEAK HAIL SIZE...2.00-3.50 IN Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0759 PM CDT Sat Jun 27 2026 Valid 280100Z - 281200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS THROUGH EARLY TONIGHT ACROSS WESTERN NORTH DAKOTA AND VICINITY... ...SUMMARY... The threat for isolated very large hail (2+ inches in diameter) and swaths of severe outflow gusts (potentially exceeding 80 mph) will persist through early tonight across the Dakotas and far eastern Montana. A couple of tornadoes will also be possible with lingering supercells this evening and embedded circulations within the larger clusters. ...Northern Plains... Thunderstorms have been growing upscale into the primary cluster over southwest ND, with additional frontal convection into eastern MT and another cluster moving off the lee trough in southwest SD. Vertical shear and buoyancy remain favorable for supercells with isolated very large hail, though the clear trend to the expected cluster/linear mode suggests that severe outflow gusts of 60-85+ mph will be the main threat across the western Dakotas through early tonight. A few tornadoes are still possible late this evening with lingering supercells from west central ND to northwest NE per the 00z BIS and LBF soundings, though the threat will transition more to embedded circulations within line segments across SD/ND. The ND cluster is expected to weaken late tonight across central/eastern ND, while the SD cluster may persist longer in a strengthening warm advection regime, though the severe threat will slowly diminish with eastward extent as the convection becomes elevated. ...Eastern MO to KY/TN... Multiple, remnant MCVs are moving eastward from eastern MO across KY to NC. Prior convection has overturned much of NC, where the threat for wind damage has diminished. There will still be a low-end wind damage threat where the MCVs move along the northern gradient of somewhat larger buoyancy from eastern MO to KY/TN. A brief tornado may also occur in the short term with supercell structures in the warm advection zone where low-level shear is slightly enhanced on the southwest flank of the primary MCV moving across KY. ...West TX/southeast TX Panhandle in the short term... Only isolated deep convection has formed as of this evening across the Pecos Valley and near CDS. Lingering hot surface temperatures and inverted-V profiles could still support isolated severe outflow gusts through about 02-03z. ..Thompson.. 06/28/2026 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0759 PM CDT Sat Jun 27 2026 Valid 280100Z - 281200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS THROUGH EARLY TONIGHT ACROSS WESTERN NORTH DAKOTA AND VICINITY... ...SUMMARY... The threat for isolated very large hail (2+ inches in diameter) and swaths of severe outflow gusts (potentially exceeding 80 mph) will persist through early tonight across the Dakotas and far eastern Montana. A couple of tornadoes will also be possible with lingering supercells this evening and embedded circulations within the larger clusters. ...Northern Plains... Thunderstorms have been growing upscale into the primary cluster over southwest ND, with additional frontal convection into eastern MT and another cluster moving off the lee trough in southwest SD. Vertical shear and buoyancy remain favorable for supercells with isolated very large hail, though the clear trend to the expected cluster/linear mode suggests that severe outflow gusts of 60-85+ mph will be the main threat across the western Dakotas through early tonight. A few tornadoes are still possible late this evening with lingering supercells from west central ND to northwest NE per the 00z BIS and LBF soundings, though the threat will transition more to embedded circulations within line segments across SD/ND. The ND cluster is expected to weaken late tonight across central/eastern ND, while the SD cluster may persist longer in a strengthening warm advection regime, though the severe threat will slowly diminish with eastward extent as the convection becomes elevated. ...Eastern MO to KY/TN... Multiple, remnant MCVs are moving eastward from eastern MO across KY to NC. Prior convection has overturned much of NC, where the threat for wind damage has diminished. There will still be a low-end wind damage threat where the MCVs move along the northern gradient of somewhat larger buoyancy from eastern MO to KY/TN. A brief tornado may also occur in the short term with supercell structures in the warm advection zone where low-level shear is slightly enhanced on the southwest flank of the primary MCV moving across KY. ...West TX/southeast TX Panhandle in the short term... Only isolated deep convection has formed as of this evening across the Pecos Valley and near CDS. Lingering hot surface temperatures and inverted-V profiles could still support isolated severe outflow gusts through about 02-03z. ..Thompson.. 06/28/2026 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0759 PM CDT Sat Jun 27 2026 Valid 280100Z - 281200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS THROUGH EARLY TONIGHT ACROSS WESTERN NORTH DAKOTA AND VICINITY... ...SUMMARY... The threat for isolated very large hail (2+ inches in diameter) and swaths of severe outflow gusts (potentially exceeding 80 mph) will persist through early tonight across the Dakotas and far eastern Montana. A couple of tornadoes will also be possible with lingering supercells this evening and embedded circulations within the larger clusters. ...Northern Plains... Thunderstorms have been growing upscale into the primary cluster over southwest ND, with additional frontal convection into eastern MT and another cluster moving off the lee trough in southwest SD. Vertical shear and buoyancy remain favorable for supercells with isolated very large hail, though the clear trend to the expected cluster/linear mode suggests that severe outflow gusts of 60-85+ mph will be the main threat across the western Dakotas through early tonight. A few tornadoes are still possible late this evening with lingering supercells from west central ND to northwest NE per the 00z BIS and LBF soundings, though the threat will transition more to embedded circulations within line segments across SD/ND. The ND cluster is expected to weaken late tonight across central/eastern ND, while the SD cluster may persist longer in a strengthening warm advection regime, though the severe threat will slowly diminish with eastward extent as the convection becomes elevated. ...Eastern MO to KY/TN... Multiple, remnant MCVs are moving eastward from eastern MO across KY to NC. Prior convection has overturned much of NC, where the threat for wind damage has diminished. There will still be a low-end wind damage threat where the MCVs move along the northern gradient of somewhat larger buoyancy from eastern MO to KY/TN. A brief tornado may also occur in the short term with supercell structures in the warm advection zone where low-level shear is slightly enhanced on the southwest flank of the primary MCV moving across KY. ...West TX/southeast TX Panhandle in the short term... Only isolated deep convection has formed as of this evening across the Pecos Valley and near CDS. Lingering hot surface temperatures and inverted-V profiles could still support isolated severe outflow gusts through about 02-03z. ..Thompson.. 06/28/2026 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0759 PM CDT Sat Jun 27 2026 Valid 280100Z - 281200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS THROUGH EARLY TONIGHT ACROSS WESTERN NORTH DAKOTA AND VICINITY... ...SUMMARY... The threat for isolated very large hail (2+ inches in diameter) and swaths of severe outflow gusts (potentially exceeding 80 mph) will persist through early tonight across the Dakotas and far eastern Montana. A couple of tornadoes will also be possible with lingering supercells this evening and embedded circulations within the larger clusters. ...Northern Plains... Thunderstorms have been growing upscale into the primary cluster over southwest ND, with additional frontal convection into eastern MT and another cluster moving off the lee trough in southwest SD. Vertical shear and buoyancy remain favorable for supercells with isolated very large hail, though the clear trend to the expected cluster/linear mode suggests that severe outflow gusts of 60-85+ mph will be the main threat across the western Dakotas through early tonight. A few tornadoes are still possible late this evening with lingering supercells from west central ND to northwest NE per the 00z BIS and LBF soundings, though the threat will transition more to embedded circulations within line segments across SD/ND. The ND cluster is expected to weaken late tonight across central/eastern ND, while the SD cluster may persist longer in a strengthening warm advection regime, though the severe threat will slowly diminish with eastward extent as the convection becomes elevated. ...Eastern MO to KY/TN... Multiple, remnant MCVs are moving eastward from eastern MO across KY to NC. Prior convection has overturned much of NC, where the threat for wind damage has diminished. There will still be a low-end wind damage threat where the MCVs move along the northern gradient of somewhat larger buoyancy from eastern MO to KY/TN. A brief tornado may also occur in the short term with supercell structures in the warm advection zone where low-level shear is slightly enhanced on the southwest flank of the primary MCV moving across KY. ...West TX/southeast TX Panhandle in the short term... Only isolated deep convection has formed as of this evening across the Pecos Valley and near CDS. Lingering hot surface temperatures and inverted-V profiles could still support isolated severe outflow gusts through about 02-03z. ..Thompson.. 06/28/2026 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0759 PM CDT Sat Jun 27 2026 Valid 280100Z - 281200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS THROUGH EARLY TONIGHT ACROSS WESTERN NORTH DAKOTA AND VICINITY... ...SUMMARY... The threat for isolated very large hail (2+ inches in diameter) and swaths of severe outflow gusts (potentially exceeding 80 mph) will persist through early tonight across the Dakotas and far eastern Montana. A couple of tornadoes will also be possible with lingering supercells this evening and embedded circulations within the larger clusters. ...Northern Plains... Thunderstorms have been growing upscale into the primary cluster over southwest ND, with additional frontal convection into eastern MT and another cluster moving off the lee trough in southwest SD. Vertical shear and buoyancy remain favorable for supercells with isolated very large hail, though the clear trend to the expected cluster/linear mode suggests that severe outflow gusts of 60-85+ mph will be the main threat across the western Dakotas through early tonight. A few tornadoes are still possible late this evening with lingering supercells from west central ND to northwest NE per the 00z BIS and LBF soundings, though the threat will transition more to embedded circulations within line segments across SD/ND. The ND cluster is expected to weaken late tonight across central/eastern ND, while the SD cluster may persist longer in a strengthening warm advection regime, though the severe threat will slowly diminish with eastward extent as the convection becomes elevated. ...Eastern MO to KY/TN... Multiple, remnant MCVs are moving eastward from eastern MO across KY to NC. Prior convection has overturned much of NC, where the threat for wind damage has diminished. There will still be a low-end wind damage threat where the MCVs move along the northern gradient of somewhat larger buoyancy from eastern MO to KY/TN. A brief tornado may also occur in the short term with supercell structures in the warm advection zone where low-level shear is slightly enhanced on the southwest flank of the primary MCV moving across KY. ...West TX/southeast TX Panhandle in the short term... Only isolated deep convection has formed as of this evening across the Pecos Valley and near CDS. Lingering hot surface temperatures and inverted-V profiles could still support isolated severe outflow gusts through about 02-03z. ..Thompson.. 06/28/2026 Read more

MD 1355 CONCERNING TORNADO WATCH 406... FOR PARTS OF THE WESTERN DAKOTAS
Mesoscale Discussion 1355 NWS Storm Prediction Center Norman OK 0547 PM CDT Sat Jun 27 2026 Areas affected...parts of the western Dakotas Concerning...Tornado Watch 406... Valid 272247Z - 280045Z The severe weather threat for Tornado Watch 406 continues. SUMMARY...The risk for supercells capable of producing sizable hail and increasing potential for a couple strong tornadoes is probably highest between now and 6-7 PM MDT. DISCUSSION...Strong thunderstorm development is now well underway within clusters developing north and northeast of the Big Horn Mountains, and within deep surface troughing, near the northeastern Montana international border. More recent, and still discrete, storm initiation has been occurring in the vicinity of the surface trough axis near the southeastern Montana/Dakotas state border through western South Dakota to the north of the Black Hills. Immediately to the north and east of the latter activity, boundary-layer instability is currently maximized in a narrow corridor and appears to include CAPE in excess of 3000 J/kg. Prior to the arrival of consolidating and strengthening outflow emanating from the upstream convection, there appears a couple of hour window for intensifying discrete storm development, in the presence of strong deep-layer shear beneath 40-50 kt southerly flow around 500 mb. Some further strengthening of south-southeasterly flow around 850 mb through 00-01Z may contribute to enlarging clockwise-curved low-level hodographs increasingly conducive to the development of tornadoes, in addition to large hail and localized strong downbursts. ..Kerr.. 06/27/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...ABR...BIS...UNR... LAT...LON 45840350 46200350 46740357 47460386 47720339 47360277 46960220 46110128 44810162 44490194 44650237 45410301 45840350 MOST PROBABLE PEAK TORNADO INTENSITY...120-145 MPH MOST PROBABLE PEAK WIND GUST...75-90 MPH MOST PROBABLE PEAK HAIL SIZE...2.00-3.50 IN Read more

MD 1356 CONCERNING SEVERE THUNDERSTORM WATCH 405...408... FOR PARTS OF EASTERN MONTANA INTO THE WESTERN DAKOTAS
Mesoscale Discussion 1356 NWS Storm Prediction Center Norman OK 0615 PM CDT Sat Jun 27 2026 Areas affected...parts of eastern Montana into the western Dakotas Concerning...Severe Thunderstorm Watch 405...408... Valid 272315Z - 280115Z The severe weather threat for Severe Thunderstorm Watch 405, 408 continues. SUMMARY...Storms posing a risk for large hail and localized downbursts will transition to primarily broader swaths of strong to severe wind gusts through 6-8 PM MDT. DISCUSSION...Forcing for ascent associated with one or two short wave impulses pivoting around the eastern periphery of the large-scale upstream low continues to support increasing thunderstorm development off the higher terrain and within the lee surface troughing. This includes a couple of notable clusters spreading north and northeast of the Big Horns and one progressing across the northeastern international border area. Strongest boundary-layer instability is focused in higher moisture content to the east of the surface trough axis, but modestly moist upslope flow to the west of the trough axis appears unstable enough to maintain upscale growth during the next few hours. Gradually, the severe hail and localized damaging downburst threat will shift to primarily a broader strong to severe gust threat with enlarging, strengthening and consolidating surface cold pools, which should tend to surge east-northeastward toward the western Dakotas state border vicinity as they consolidate toward 00-02Z. ..Kerr.. 06/27/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...BIS...UNR...BYZ...GGW... LAT...LON 48770447 47440326 45400399 45510628 47470652 48120623 48770447 MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH MOST PROBABLE PEAK WIND GUST...75-90 MPH MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN Read more

WW 0406 Status Updates
STATUS REPORT ON WW 406 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..KERR..06/28/26 ATTN...WFO...BIS...LBF...UNR...ABR... STATUS REPORT FOR WT 406 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS NEC031-161-280140- NE . NEBRASKA COUNTIES INCLUDED ARE CHERRY SHERIDAN NDC001-007-011-013-023-025-033-037-041-053-057-059-061-065-085- 087-089-105-280140- ND . NORTH DAKOTA COUNTIES INCLUDED ARE ADAMS BILLINGS BOWMAN BURKE DIVIDE DUNN GOLDEN VALLEY GRANT HETTINGER MCKENZIE MERCER MORTON MOUNTRAIL OLIVER SIOUX SLOPE STARK WILLIAMS SDC007-019-031-041-055-063-071-081-093-102-103-105-137-280140- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE Read more

WW 0406 Status Updates
STATUS REPORT ON WW 406 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..KERR..06/28/26 ATTN...WFO...BIS...LBF...UNR...ABR... STATUS REPORT FOR WT 406 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS NEC031-161-280140- NE . NEBRASKA COUNTIES INCLUDED ARE CHERRY SHERIDAN NDC001-007-011-013-023-025-033-037-041-053-057-059-061-065-085- 087-089-105-280140- ND . NORTH DAKOTA COUNTIES INCLUDED ARE ADAMS BILLINGS BOWMAN BURKE DIVIDE DUNN GOLDEN VALLEY GRANT HETTINGER MCKENZIE MERCER MORTON MOUNTRAIL OLIVER SIOUX SLOPE STARK WILLIAMS SDC007-019-031-041-055-063-071-081-093-102-103-105-137-280140- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE Read more

WW 0405 Status Updates
STATUS REPORT ON WW 405 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 65 SW RAP TO 30 S BHK TO 20 SW MLS TO 45 NW MLS. SOUTHWESTERN SOUTH DAKOTA COUNTIES PROBABLY WILL BE LOCALLY EXTENDED AN HOUR, OTHERWISE THE REMAIN VALID PORTION OF THE WW MAY BE CANCELLED AT OR PRIOR TO 28/01Z. ..KERR..06/28/26 ATTN...WFO...BYZ...UNR...RIW... STATUS REPORT FOR WS 405 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC017-025-280100- MT . MONTANA COUNTIES INCLUDED ARE CUSTER FALLON SDC033-047-280100- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE CUSTER FALL RIVER THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0405 Status Updates
STATUS REPORT ON WW 405 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 65 SW RAP TO 30 S BHK TO 20 SW MLS TO 45 NW MLS. SOUTHWESTERN SOUTH DAKOTA COUNTIES PROBABLY WILL BE LOCALLY EXTENDED AN HOUR, OTHERWISE THE REMAIN VALID PORTION OF THE WW MAY BE CANCELLED AT OR PRIOR TO 28/01Z. ..KERR..06/28/26 ATTN...WFO...BYZ...UNR...RIW... STATUS REPORT FOR WS 405 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC017-025-280100- MT . MONTANA COUNTIES INCLUDED ARE CUSTER FALLON SDC033-047-280100- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE CUSTER FALL RIVER THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0405 Status Updates
STATUS REPORT ON WW 405 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 65 SW RAP TO 30 S BHK TO 20 SW MLS TO 45 NW MLS. SOUTHWESTERN SOUTH DAKOTA COUNTIES PROBABLY WILL BE LOCALLY EXTENDED AN HOUR, OTHERWISE THE REMAIN VALID PORTION OF THE WW MAY BE CANCELLED AT OR PRIOR TO 28/01Z. ..KERR..06/28/26 ATTN...WFO...BYZ...UNR...RIW... STATUS REPORT FOR WS 405 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC017-025-280100- MT . MONTANA COUNTIES INCLUDED ARE CUSTER FALLON SDC033-047-280100- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE CUSTER FALL RIVER THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0405 Status Updates
STATUS REPORT ON WW 405 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 65 SW RAP TO 30 S BHK TO 20 SW MLS TO 45 NW MLS. SOUTHWESTERN SOUTH DAKOTA COUNTIES PROBABLY WILL BE LOCALLY EXTENDED AN HOUR, OTHERWISE THE REMAIN VALID PORTION OF THE WW MAY BE CANCELLED AT OR PRIOR TO 28/01Z. ..KERR..06/28/26 ATTN...WFO...BYZ...UNR...RIW... STATUS REPORT FOR WS 405 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC017-025-280100- MT . MONTANA COUNTIES INCLUDED ARE CUSTER FALLON SDC033-047-280100- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE CUSTER FALL RIVER THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0405 Status Updates
STATUS REPORT ON WW 405 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 65 SW RAP TO 30 S BHK TO 20 SW MLS TO 45 NW MLS. SOUTHWESTERN SOUTH DAKOTA COUNTIES PROBABLY WILL BE LOCALLY EXTENDED AN HOUR, OTHERWISE THE REMAIN VALID PORTION OF THE WW MAY BE CANCELLED AT OR PRIOR TO 28/01Z. ..KERR..06/28/26 ATTN...WFO...BYZ...UNR...RIW... STATUS REPORT FOR WS 405 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC017-025-280100- MT . MONTANA COUNTIES INCLUDED ARE CUSTER FALLON SDC033-047-280100- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE CUSTER FALL RIVER THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 405 SEVERE TSTM MT WY 271905Z - 280100Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 405 NWS Storm Prediction Center Norman OK 105 PM MDT Sat Jun 27 2026 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southeast Montana Northeast Wyoming * Effective this Saturday afternoon and evening from 105 PM until 700 PM MDT. * Primary threats include... Scattered large hail likely with isolated very large hail events to 2.5 inches in diameter possible Scattered damaging winds and isolated significant gusts to 80 mph possible A tornado or two possible SUMMARY...Steady severe storm development including supercells are expected relatively early today, steadily increasing through the afternoon across the region, including the potential for very large hail and severe-caliber wind gusts. The severe thunderstorm watch area is approximately along and 75 statute miles east and west of a line from 60 miles south southwest of Gillette WY to 25 miles north northwest of Miles City MT. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU5). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 403...WW 404... AVIATION...A few severe thunderstorms with hail surface and aloft to 2.5 inches. Extreme turbulence and surface wind gusts to 70 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 22030. ...Guyer Read more

WW 0403 Status Updates
STATUS REPORT ON WW 403 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 E MDH TO 45 SW EVV TO 20 NE OWB TO 35 WNW SDF TO 35 ESE BMG. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1357 ..CHALMERS..06/27/26 ATTN...WFO...PAH...LMK...MEG...OHX... STATUS REPORT FOR WS 403 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS ILC003-069-087-127-151-153-181-280040- IL . ILLINOIS COUNTIES INCLUDED ARE ALEXANDER HARDIN JOHNSON MASSAC POPE PULASKI UNION INC025-061-123-175-280040- IN . INDIANA COUNTIES INCLUDED ARE CRAWFORD HARRISON PERRY WASHINGTON KYC003-007-009-027-031-033-035-039-047-055-059-061-075-083-085- 091-093-099-105-107-123-139-141-143-145-149-157-163-177-183-213- 219-221-227-233-280040- Read more