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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.


Thursday, August 31, 2023

SPC Aug 31, 2023 0600 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1200Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1244 AM CDT Thu Aug 31 2023 Valid 311200Z - 011200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF ARIZONA... ...SUMMARY... Gusty winds may accompany convection across Arizona late Thursday afternoon and evening. ...Arizona... Upper anticyclone currently centered over the southwestern US is forecast to shift east and weaken a bit by the end of the period. As this large-scale feature moves east, mid-level flow will become southeasterly across northwestern Mexico into AZ. As a result, higher PW air mass will advance north across the lower CO River Valley and adjacent lower desert regions by 01/00z. Scattered convection that developed Wednesday evening over southeast AZ continues to propagate southwest into northern Mexico. It appears convective debris will not inhibit boundary layer heating Thursday and surface temperatures will likely soar above 100F again at lower elevations, effectively removing inhibition as convective temperatures are breached. High-based convection is once again expected to develop by 21z then propagate northwest within strengthening southeasterly mid-level flow. Gusty winds are the primary risk with this activity. ...TS Idalia... TS Idalia is forecast to move off the Carolina Coast around sunrise, then curve east over the western Atlantic. This evolution should result in stronger shear focusing offshore along with any meaningful supercell threat. ..Darrow/Thornton.. 08/31/2023 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)