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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, February 20, 2022

SPC Feb 20, 2022 2000 UTC Day 1 Convective Outlook

SPC 2000Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0142 PM CST Sun Feb 20 2022 Valid 202000Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few lighting flashes will be possible with showers across parts of the Northwest this afternoon and evening. Isolated thunderstorms may occur late tonight across portions of the lower Mississippi Valley/ArkLaTex region. ...20Z Update... No changes have been made to the outlook. See the previous discussion below for more details regarding the general thunderstorm threat in the Pacific Northwest and lower MS Valley. ..Dean.. 02/20/2022 .PREV DISCUSSION... /ISSUED 1005 AM CST Sun Feb 20 2022/ ...Pacific Northwest... Water vapor imagery shows an upper trough digging toward the WA/OR coast. Cold temperatures aloft and strong onshore flow will pose a risk of isolated lightning flashes throughout the forecast period in this area. More diurnally-driven thunderstorms are possible farther east over portions of eastern WA/OR and northern ID as the steeper lapse rates overspread the region. ...Lower MS Valley... Southerly low-level winds are forecast to strengthen tonight over the Arklatex region, helping to transport Gulf moisture northward and slowly destabilize the region. Enhanced warm-advection and lift may lead to a few elevated thunderstorms after 06z. No severe storms are forecast. Read more CHECK UPDATE ZOOM GRAPHIC
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