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Weather conditions on bar directly above are near Lakefront. Tabs under Moon Phases refer to O'Hare (official).

Archives for SPC Convective outlook are updated daily with a live map a the beginning of the article. Touch or click map to get possible update, and follow link at end of article for referral to NOAA/NWS Storm Prediction Center. Archives for Chicago's hourly weather data were updated 24-48 hours after end of each day prior to Dec. 2020.

Friday, July 2, 2021

SPC Jul 2, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1119 AM CDT Fri Jul 02 2021 Valid 021630Z - 031200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHEAST STATES AND COASTAL CAROLINAS... ...SUMMARY... Isolated severe hail and locally damaging winds are possible over parts of the Northeast States, mainly from mid-afternoon to early evening. Localized damaging winds are also possible across the coastal Carolinas. ...Carolinas... Focused along convective outflow, bands of showers and thunderstorms persist at midday across the coastal Carolinas parallel to an upstream southeastward-moving cold front. A moisture-rich air mass precedes the front while the strongest insolation is occurring along the immediate coast, roughly to about 35 miles inland from the coast as of 16Z. The primary concern for isolated severe thunderstorm development would be in this near-coastal zone this afternoon where stronger destabilization is expected coincident with 30-35 kt effective shear. However, while appreciable cloud cover will persist near the front much of the afternoon, there is some potential that additional thunderstorms could develop near the front later this afternoon into evening. Although overall destabilization should remain weak, a few stronger storms could occur across Piedmont areas pending near/pre-frontal air mass recovery later today. Overall, some multicellular clusters capable of localized wind damage are possible this afternoon through early evening. ...Northeast States... Relatively cool mid-level temperatures (near -18C at 500mb as per this morning's observed Buffalo NY sounding) will accompany an east-southeastward-moving upper low centered over Pennsylvania/southern New York. As additional cloud breaks/heating occur, semi-steep lapse rates and 500-1000 J/kg MLCAPE should support some strong to locally severe low-topped thunderstorms this afternoon. Quasi-long hodographs accentuated by strong anvil-level southwesterly winds will support the potential for hail, particularly across north-central/eastern Pennsylvania and nearby southern New York. Gusty winds and isolated tree damage could also occur. ...North-central High Plains... A few strong storms may develop late this afternoon and early evening across eastern Wyoming/southeast Montana into western South Dakota/southwest North Dakota. These storms will be in proximity to a weak and slow east/northeastward-moving mid-level impulse, coincident with a modestly moist air mass to the east of a surface trough/front. While steep lapse rates and upwards of 1000-1500 J/kg MLCAPE could support stronger storms, weak effective shear (20-25 kt or less) and warm mid-level temperatures/high freezing levels are expected to limit the potential for consequential hail and overall storm organization/sustenance. For these reasons, severe probabilities do not appear to be currently warranted. ..Guyer/Lyons.. 07/02/2021 Read more LIVE: spc.noaa.gov