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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.

Friday, April 8, 2022

SPC Apr 8, 2022 2000 UTC Day 1 Convective Outlook

SPC 2000Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0230 PM CDT Fri Apr 08 2022 Valid 082000Z - 091200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected today or tonight. ...20Z Update... Only change to the previous outlook was to extend the general thunder line eastward into more of the VA Tidewater and Delmarva. Otherwise, previous forecast remains on track. ..Mosier.. 04/08/2022 .PREV DISCUSSION... /ISSUED 1104 AM CDT Fri Apr 08 2022/ ...Synopsis... A broad upper level low will drift slowly east across the eastern CONUS today with ridging building into the Western CONUS with a trough across the Pacific Northwest. Shallow convection is expected across much of the Ohio Valley and the central Appalachians beneath very cold air aloft (-31 C per ILN 12Z RAOB). Only minimal surface heating was needed for surface based convection and unsurprisingly, extensive shower activity hs developed. As surface temperatures warm a bit more, CAPE profiles will be deep enough to support lightning across much of the region. Additionally, some gusty winds are possible with these showers with steep lapse rates and 30 to 35 knots at 850mb. Additional thunderstorm activity is expected in western Washington today beneath cooling temperatures aloft. Areas east of the Cascades will be rain shadowed, but additional thunderstorm activity is expected this evening and overnight from central Idaho into southwest Montana as the trough shifts east. Read more CHECK UPDATE ZOOM GRAPHIC
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