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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.


Tuesday, June 15, 2021

SPC Jun 15, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0228 AM CDT Tue Jun 15 2021 Valid 171200Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM IOWA INTO WISCONSIN... ...SUMMARY... Scattered strong to severe storms are possible over the upper Mississippi and Great Lakes region on Thursday. ...Upper MS Valley/Great Lakes... A positive-tilt shortwave trough will gradually shift southeastward across the northern Plains and upper MS valley on Thursday, with cooling aloft most prominent overnight. This will shunt the upper ridge eastward across MI during the day and into the Northeast by 12Z Friday. At the surface, a trough/wind shift will extend roughly from MN into NE, with mid to upper 60s F dewpoints from the mid MO Valley northward into MN, WI, and the U.P. of MI. The surface trough is forecast to be quasi-stationary through the period, providing several bouts of thunderstorms. Thursday morning, storms may be ongoing across southern MN or IA, depending on how much nocturnal convection occurs Wednesday night, with strong wind gusts possible. Additional storms are likely near the surface trough (and perhaps residual outflow boundaries) farther north and west, though drying will increase late in the period with veering 850 mb winds. Over 2000 J/kg MUCAPE is possible by late afternoon where the air mass remains undisturbed from earlier storms. Effective shear is forecast to be around 50 kt, which will support a wind and hail threat. ..Jewell.. 06/15/2021 Read more LIVE:
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)