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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.

Thursday, May 20, 2021

SPC May 21, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0803 PM CDT Thu May 20 2021 Valid 210100Z - 211200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF THE NORTHERN HIGH PLAINS AND ALSO THE UPPER MS VALLEY... ...SUMMARY... A few strong thunderstorms remain possible this evening across the northern High Plains and also in the upper Mississippi Valley vicinity. ...Northern High Plains... Thunderstorms across the northern High Plains have struggled to maintain severe intensity, and are now moving into a region of somewhat diminished effective shear. The severe threat should generally decrease this evening as instability weakens, but isolated hail will remain possible with the strongest cells. Some upscale-growing clusters will also pose a threat of isolated strong wind gusts until convection weakens with time or moves north of the surface boundary that is situated across central ND. ...Portions of IA/MN/WI... An increasing low-level jet will become focused into portions of IA/MN/WI this evening. Weak instability has limited convective intensity across this region thus far, but with low-level flow/shear remaining favorable, the strongest convective elements may be capable of producing a brief tornado or locally strong wind gusts for a period of time this evening. ...ArkLaTex... Convection will persist tonight from near the southeast LA coast into the ArkLaTex vicinity. While remaining convection may attain brief rotation, the organized severe risk is generally expected to diminish with time this evening. ..Dean.. 05/21/2021 Read more LIVE: spc.noaa.gov