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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.

Sunday, July 18, 2021

SPC Jul 18, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1126 AM CDT Sun Jul 18 2021 Valid 181630Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER A PORTION OF THE CENTRAL PLAINS AS WELL AS THE LOWER MISSISSIPPI VALLEY... ...SUMMARY... Isolated large hail and strong wind gusts remain possible this afternoon and evening mainly across a portion of the central High Plains. A few strong wind gusts are also possible over the lower Mississippi Valley area. ...Central Plains... The boundary layer continues to destabilize across western KS to the south of a small complex of storms and its associated MCV currently located across northwest KS. This activity may continue to pose a risk for isolated large hail and strong wind gusts as it develops southward next few hours though some uncertainty remains regarding its longevity. Warm advection storms are forecast to develop later tonight from central NE into north central KS. Some of these storms could pose a risk for mainly isolated marginally severe hail. ...Lower Mississippi Valley... The boundary layer is recovering south of a line of scattered storms situated across southern AR. This activity might become capable of producing a few strong gusts as it develops southeast into the destabilizing boundary layer where moderate instability will reside this afternoon. ..Dial/Wendt.. 07/18/2021 Read more LIVE: spc.noaa.gov