SPC Jul 19, 2026 2000 UTC Day 1 Convective Outlook
SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0253 PM CDT Sun Jul 19 2026 Valid 192000Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHERN PLAINS AND PARTS OF THE SOUTHEAST AND MID-ATLANTIC... ...SUMMARY... Scattered damaging wind gusts are possible this afternoon over portions of the Southeast. Scattered severe thunderstorms capable of severe wind gusts and large hail are possible late this afternoon through tonight from the Dakotas into Minnesota. ...20z Update... The previous forecast largely remains on track with only minor adjustments made based on recent convective trends and latest high-res ensemble guidance. ...Georgia and Mid-Atlantic... Across northern Georgia, convection has thus far exhibited mostly pulse-like behavior with transient and weak updrafts. Regional velocity imagery shows occasional swaths of strong winds embedded within downbursts, so some localized damaging wind threat will likely persist across the region through early evening given hot low-level conditions surrounding ongoing storms. However, based on these observed trends, limited clustering, and weak convective signals in latest guidance, the 15% wind probabilities have been trimmed eastward to align with more favorable thermodynamic conditions (particularly steeper low-level lapse rates) and where guidance continues to show some thunderstorm potential through late afternoon. See MCD #1660 for additional near-term forecast information. Further east, a mix of thunderstorm clusters and loosely organized cells has been observed with occasional reports of wind damage noted over the past few hours. Based on recent mesoanalyses, the best thermodynamic and kinematic environment remain across eastern VA/NC, and consideration was made for introducing 5% hail probabilities. However, MRMS VIL/MESH trends show relatively transient and weak hail cores, suggesting that damaging winds will remain the predominant threat through early evening. ...Northern High Plains... Latest HRRR/RRFS time-lagged ensembles continue to show a strong signal for severe wind across south-central ND and far northern SD later this evening as thunderstorms develop along the approaching cold front. Observational trends seem to support this as low 70 dewpoints continue to spread north into ND and pre-frontal cumulus begins to develop along the western SD/ND border. Aside from minor adjustments of probability/intensity lines to better align with recent guidance and satellite trends, forecast thoughts outlined in the previous discussion (below) remain on track. ..Moore.. 07/19/2026 .PREV DISCUSSION... /ISSUED 1124 AM CDT Sun Jul 19 2026/ ...Dakotas/MN this afternoon into tonight... A midlevel trough over southern SK will suppress the northern extent of the ridge over the Great Plains as an associated surface trough/front moves into ND this afternoon. Strong surface heating/mixing and weak ascent along the wind shift could support thunderstorm development after about 22z beginning in south central ND and expanding into northern SD and northeast ND through late evening. The initial storms will be relatively high based with forecast hodographs favoring splitting supercells capable of producing significant outflow gusts (80+ mph) and isolated very large hail (2-3+ inch diameter). Storms are expected to evolve into a cluster or two tonight while spreading east-southeastward toward western MN with a continued threat for occasional severe outflow gusts and large hail. ...Carolinas and vicinity this afternoon/evening... A weak cold front will continue to drift southward across VA/KY toward NC through the afternoon, in association with the southern periphery of a midlevel trough moving over the Mid-Atlantic and southern New England. The southern extent of ~30 kt midlevel flow overlaps the baroclinic zone and northern extent of the unstable warm sector. Though midlevel lapse rates are not steep per 12z soundings, surface temperatures warming into the 90-95 F range with dewpoints in the low-mid 70s will drive MLCAPE of 2500-3500 J/kg with negligible convective inhibition and steepening low-level lapse rates. Scattered thunderstorm development is likely by early-mid afternoon along the differential heating zone near the cold front, as well as along a subtle surface trough across eastern NC. Multicell clusters are the primary expected storm mode with the potential to produce occasional wind damage with downbursts this afternoon/evening. Vertical shear will be a little stronger across southeast VA/northeast NC where some storm organization will be possible. ...Tropical Depression 2 in the eastern Gulf... NHC has initiated advisories on Tropical Depression 2 in the eastern Gulf, centered roughly 130 n mi west of Tampa as of 15z. Though some outer eastern bands will affect the FL Gulf coast this afternoon, it appears that enhancements to flow/shear are too marginal to support any substantial threat of outer band supercells/tornadoes along the FL Gulf coast through tonight. Still, isolated strong outflow gusts will be possible with broken thunderstorm bands this afternoon/evening across central/north FL and south GA. ...AL area this afternoon... Strong surface heating to the west and south of ongoing storm clusters in northern and eastern AL will contribute to destabilization and the potential for stronger storms within the clusters that will spread south/southwestward through the afternoon. Precipitation loading and steepening low-level lapse rates could support isolated downbursts and wind damage with the strongest storms. Read more
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0253 PM CDT Sun Jul 19 2026 Valid 192000Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHERN PLAINS AND PARTS OF THE SOUTHEAST AND MID-ATLANTIC... ...SUMMARY... Scattered damaging wind gusts are possible this afternoon over portions of the Southeast. Scattered severe thunderstorms capable of severe wind gusts and large hail are possible late this afternoon through tonight from the Dakotas into Minnesota. ...20z Update... The previous forecast largely remains on track with only minor adjustments made based on recent convective trends and latest high-res ensemble guidance. ...Georgia and Mid-Atlantic... Across northern Georgia, convection has thus far exhibited mostly pulse-like behavior with transient and weak updrafts. Regional velocity imagery shows occasional swaths of strong winds embedded within downbursts, so some localized damaging wind threat will likely persist across the region through early evening given hot low-level conditions surrounding ongoing storms. However, based on these observed trends, limited clustering, and weak convective signals in latest guidance, the 15% wind probabilities have been trimmed eastward to align with more favorable thermodynamic conditions (particularly steeper low-level lapse rates) and where guidance continues to show some thunderstorm potential through late afternoon. See MCD #1660 for additional near-term forecast information. Further east, a mix of thunderstorm clusters and loosely organized cells has been observed with occasional reports of wind damage noted over the past few hours. Based on recent mesoanalyses, the best thermodynamic and kinematic environment remain across eastern VA/NC, and consideration was made for introducing 5% hail probabilities. However, MRMS VIL/MESH trends show relatively transient and weak hail cores, suggesting that damaging winds will remain the predominant threat through early evening. ...Northern High Plains... Latest HRRR/RRFS time-lagged ensembles continue to show a strong signal for severe wind across south-central ND and far northern SD later this evening as thunderstorms develop along the approaching cold front. Observational trends seem to support this as low 70 dewpoints continue to spread north into ND and pre-frontal cumulus begins to develop along the western SD/ND border. Aside from minor adjustments of probability/intensity lines to better align with recent guidance and satellite trends, forecast thoughts outlined in the previous discussion (below) remain on track. ..Moore.. 07/19/2026 .PREV DISCUSSION... /ISSUED 1124 AM CDT Sun Jul 19 2026/ ...Dakotas/MN this afternoon into tonight... A midlevel trough over southern SK will suppress the northern extent of the ridge over the Great Plains as an associated surface trough/front moves into ND this afternoon. Strong surface heating/mixing and weak ascent along the wind shift could support thunderstorm development after about 22z beginning in south central ND and expanding into northern SD and northeast ND through late evening. The initial storms will be relatively high based with forecast hodographs favoring splitting supercells capable of producing significant outflow gusts (80+ mph) and isolated very large hail (2-3+ inch diameter). Storms are expected to evolve into a cluster or two tonight while spreading east-southeastward toward western MN with a continued threat for occasional severe outflow gusts and large hail. ...Carolinas and vicinity this afternoon/evening... A weak cold front will continue to drift southward across VA/KY toward NC through the afternoon, in association with the southern periphery of a midlevel trough moving over the Mid-Atlantic and southern New England. The southern extent of ~30 kt midlevel flow overlaps the baroclinic zone and northern extent of the unstable warm sector. Though midlevel lapse rates are not steep per 12z soundings, surface temperatures warming into the 90-95 F range with dewpoints in the low-mid 70s will drive MLCAPE of 2500-3500 J/kg with negligible convective inhibition and steepening low-level lapse rates. Scattered thunderstorm development is likely by early-mid afternoon along the differential heating zone near the cold front, as well as along a subtle surface trough across eastern NC. Multicell clusters are the primary expected storm mode with the potential to produce occasional wind damage with downbursts this afternoon/evening. Vertical shear will be a little stronger across southeast VA/northeast NC where some storm organization will be possible. ...Tropical Depression 2 in the eastern Gulf... NHC has initiated advisories on Tropical Depression 2 in the eastern Gulf, centered roughly 130 n mi west of Tampa as of 15z. Though some outer eastern bands will affect the FL Gulf coast this afternoon, it appears that enhancements to flow/shear are too marginal to support any substantial threat of outer band supercells/tornadoes along the FL Gulf coast through tonight. Still, isolated strong outflow gusts will be possible with broken thunderstorm bands this afternoon/evening across central/north FL and south GA. ...AL area this afternoon... Strong surface heating to the west and south of ongoing storm clusters in northern and eastern AL will contribute to destabilization and the potential for stronger storms within the clusters that will spread south/southwestward through the afternoon. Precipitation loading and steepening low-level lapse rates could support isolated downbursts and wind damage with the strongest storms. Read more