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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 9, 2021

SPC Aug 9, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0208 AM CDT Mon Aug 09 2021 Valid 111200Z - 121200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER MUCH OF THE MIDWEST AND PARTS OF THE GREAT LAKES... ...SUMMARY... Sporadic severe storms are possible on Wednesday across much of the Midwest and Great Lakes states. ...Upper MS Valley/Midwest/Great Lakes... A weak surface trough will develop across the upper MS valley on Wednesday as a lead wave moves across Ontario and a stronger upper trough develops into ND and northern MN. Robust low-level moisture and instability will again exist ahead of the surface wind shift, from WI and IA eastward toward Lake Erie. It is unclear how much diurnal activity will develop along the surface trough from WI into IA, but very strong instability will result in a conditional threat of severe storms. Weak shear over much of the area again suggests damaging wind gusts are possible, but sufficient shear may exist for a hail threat across WI and MI. Model output again shows an array of solutions regarding initiation and convective coverage, thus will only introduce a Marginal Risk. Greater probabilities may eventually be issued within the larger Marginal Risk area as predictability increases. ..Jewell.. 08/09/2021 Read more LIVE: spc.noaa.gov