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Archives for Chicago's hourly weather data updated 24-48 hours after end of each day. MOBILE CHGOWX.COM ...
Weather conditions on bar directly above are near Lakefront. Weather conditions with Moon are O'Hare (official).

Thursday, September 9, 2021

SPC Sep 10, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0751 PM CDT Thu Sep 09 2021 Valid 100100Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk for severe thunderstorms appears negligible across the U.S. through tonight. ...01Z Outlook Update... Some convection continues to produce lightning near and to the lee of the lower Great Lakes vicinity, beneath seasonably cool mid-level air associated with mid/upper troughing gradually progressing across the Northeast and Mid Atlantic. In lower levels, the surface front is in the process of advancing offshore of much of the Atlantic Seaboard, with the exception of parts of northern Florida. It appears that any appreciable risk for thunderstorms overnight will generally become focused across parts of the northeastern Gulf of Mexico into the peninsula north of the Tampa area, perhaps aided by forcing for ascent associated with a weak perturbation along a remnant mid-level shear axis. A short wave perturbation migrating around the southwestern through western periphery of the mid-level high shifting east-southeastward across the Four Corners vicinity, and large-scale forcing for ascent downstream of mid-level troughing approaching the Oregon/northern California coast, may be contributing to ongoing thunderstorm development across parts of the West. Although the number of storms probably will begin to diminish with boundary-layer cooling, widely scattered thunderstorm development may persist overnight, particularly near and north-northeast of the northern Sierra Nevada into parts of central and eastern Oregon. ..Kerr.. 09/10/2021 Read more LIVE: spc.noaa.gov
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