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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.

Monday, August 2, 2021

SPC Aug 2, 2021 0600 UTC Day 1 Convective Outlook

SPC 1200Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1220 AM CDT Mon Aug 02 2021 Valid 021200Z - 031200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER CENTRAL OREGON... ...SUMMARY... A few storms with downburst winds will be possible over central Oregon this afternoon and early evening. ...Oregon... With near-surface dewpoints mostly in the 40s F, the atmosphere will become marginally unstable later this afternoon (400-800 J/kg MLCAPE) supported by strong surface heating in presence of steep (7.5-8 C/km) mid-level lapse rates. A shortwave trough currently near the northern CA coast will continue into this region today, and widely scattered thunderstorms are expected to develop as the boundary layer destabilizes during the afternoon. Storms will be high-based with updrafts rooted near 650 mb. Steep lapse rates and inverted-v profiles in the sub-cloud layer will support a threat of isolated downburst winds through early evening. ...Rockies through the Gulf Coast states... Widely scattered to scattered thunderstorms will once again develop from the Rockies through the Gulf Coast states within environments characterized by marginal to moderate instability and weak vertical shear. While some of these storms will become capable of producing a few strong wind gusts, any severe events are expected to remain too sparse for a categorical risk area. ..Dial/Moore.. 08/02/2021 Read more LIVE: spc.noaa.gov