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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.


Sunday, December 18, 2022

SPC Dec 18, 2022 0600 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1200Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1151 PM CST Sat Dec 17 2022 Valid 181200Z - 191200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few thunderstorms are possible Sunday night across parts of southern and southeastern Texas and southwest Louisiana, and over South Florida during the day. Severe storms are unlikely. ...Synopsis... A pronounced shortwave trough currently approaching the southern CA/northern Baja Peninsula will move east across the southwest and south-central U.S. on Sunday. Strengthening southerly flow at 850 mb will result in warm/moist advection above a cool/stable boundary layer late, resulting in MUCAPE of a few hundred J/kg late Sunday night. The increasing warm advection, coupled with glancing ascent with the shortwave trough, should contribute to the development of showers and scattered thunderstorms over southern/southeast TX and southwest Louisiana mainly after 06z. Severe storms are not expected. Isolated thunderstorms will be possible across South FL and the Keys mainly during the day associated with a southward-moving cold front. As low-level flow becomes northerly with time, drying/stabilization will diminish thunderstorm potential. ..Bunting/Weinman.. 12/18/2022 Read more CHECK UPDATE ZOOM GRAPHIC
SUNRISE AND SUNSET TIMES IN UTC (if you're not logged in to Google)
CHICAGO UTC-6 during CST (Central Standard Time, e.g., winter)
CHICAGO UTC-5 during CDT (Daylight Savings Time, e.g., summer)