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MOBILE DEVICE? Turn sideways. Weather conditions directly above are near Lakefront. Top tabs refer to O'Hare (official).

Archives for the SPC Convective Outlook are updated daily (approximately) with a live map at the beginning of each article. Follow the link at the end of the article to check for current updates on the NOAA/NWS Storm Prediction Center website. Also, see Archives for Chicago's hourly weather data on CARDINAL NEWS Magazine.

Saturday, September 25, 2021

SPC Sep 25, 2021 2000 UTC Day 1 Convective Outlook

SPC 2000Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0246 PM CDT Sat Sep 25 2021 Valid 252000Z - 261200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected through tonight. ...20Z Update... No changes have been made to the prior outlook. ..Gleason.. 09/25/2021 .PREV DISCUSSION... /ISSUED 1115 AM CDT Sat Sep 25 2021/ ...Synopsis... A midlevel low will move eastward from the north shore of Lake Superior, while a trailing shortwave trough progresses from the OH Valley to the Appalachians, along with a surface cold front. Low-level moisture and buoyancy will remain quite limited along the front, with areas closer to eastern Upper MI and the lower Great Lakes slightly more favorable for isolated lightning flashes with low-topped convection this afternoon/evening. Farther east and overnight, there will be a low chance for elevated thunderstorms across eastern New England, along and to the immediate cool side of a slow-moving baroclinic zone as the ejecting Appalachians midlevel trough approaches from the southwest. The greater chances for thunderstorms are expected this afternoon across south FL in association with local sea breeze circulations in a moist environment south of a stalled front. Scattered thunderstorms are also expected through tonight in the zone of weak ascent and sufficient low-midlevel moisture across AZ/NM, northeast of a closed midlevel low over northern Baja. Read more LIVE: