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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, October 9, 2021

SPC Oct 10, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0750 PM CDT Sat Oct 09 2021 Valid 100100Z - 101200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS A PORTION OF THE UPPER MISSISSIPPI VALLEY REGION... ...SUMMARY... The threat for mainly damaging wind and a brief tornado or two will persist this evening across the upper Mississippi Valley region. ...Upper Mississippi Valley region... A severe squall line with embedded bowing segments and mesovortices currently extends from southeast ND through far western MN. Farther downstream the atmosphere remains at least marginally unstable with latest objective analysis indicating 500-1000 J/kg MLCAPE. Forcing for ascent and favorable storm-relative inflow associated with a strengthening southeasterly low-level jet will maintain this line of storms through central and north central MN next several hours. The storms are moving through a strongly sheared environment with 40-50 kt effective bulk shear as well as large low-level hodographs with 250-350 m2/s2 0-1 km storm relative helicity. This environment will continue to promote embedded organized structures with an attendant threat for damaging wind and a brief tornado or two next several hours. Storms should gradually weaken later tonight as instability becomes increasingly marginal. ..Dial.. 10/10/2021 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)