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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.

Saturday, April 9, 2022

SPC Apr 9, 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 Sat Apr 09 2022 Valid 092000Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected through tonight. ...20Z Update... Overall conditions outlined in the previous discussion (appended below) remain valid and on track. Only change for this outlook was to include more of central and southwest PA in general thunder given the deeper cores beginning to show up on radar imagery. ..Mosier.. 04/09/2022 .PREV DISCUSSION... /ISSUED 1119 AM CDT Sat Apr 09 2022/ ...Synopsis... A few low-topped thunderstorms have formed as of late morning across southern New England. The convection will persist through the afternoon in conjunction with ascent attendant to a midlevel trough ejecting northeastward over southern New England, and pockets of weak buoyancy with surface heating in cloud breaks. Isolated low-topped thunderstorms may also occur this afternoon across southeast OH and WV with the midlevel thermal trough and an embedded shortwave trough. Otherwise, a midlevel trough will continue to slowly amplify over the northern Rockies, as an associated cold front sags southward into the central High Plains. Despite limited low-midlevel moisture, isolated high-based thunderstorms may form this afternoon/evening along the front, in the zone of ascent preceding the midlevel trough. Given the high-based nature of the convection, gusty outflow winds will be possible in the inverted-v environment. Onshore flow and weak buoyancy will persist across western WA and northwestern OR, and an embedded shortwave trough will approach this area tonight. Occasional lightning flashes will be possible through tonight in this regime. Read more CHECK UPDATE ZOOM GRAPHIC
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