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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, October 21, 2021

SPC Oct 22, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0752 PM CDT Thu Oct 21 2021 Valid 220100Z - 221200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL APPALACHIANS...AND FROM NORTH-CENTRAL ALABAMA INTO THE SOUTHERN APPALACHIANS... ...SUMMARY... Thunderstorms associated with strong wind gusts and a brief tornado will be possible this evening in parts of the central Appalachians, and from parts of north-central Alabama into the southern Appalachians. ...Central Appalachians... The latest water vapor imagery shows a shortwave trough over the Great Lakes region. At the surface, a cold front is located in the upper Ohio Valley with a narrow corridor of maximized low-level moisture across West Virginia and western Pennsylvania. A line of thunderstorms is located along this corridor, where the RAP is showing weak instability with MLCAPE estimated in the 100 to 300 J/kg range. In addition, regional WSR-88D VWPs have strong deep-layer shear suggesting that a marginal wind-damage threat may persist for another hour or so. Strong wind gusts will be possible along parts of the line that remain semi-organized. ...North-central Alabama into Southern Appalachians... An upper-level trough is present on water vapor imagery across the Ohio and Tennessee Valleys. At the surface, a cold front is located in middle Tennessee with a moist airmass ahead of the front. The RAP is estimating MLCAPE in the 1000 to 2000 J/kg range from north-central Alabama into far southeast Tennessee. In addition, regional WSR-88D VWPs show moderate deep-layer shear suggesting that a marginal wind-damage threat could continue for another hour or so this evening. The stronger multicells may be capable of producing a few marginally severe wind gusts. ..Broyles.. 10/22/2021 Read more LIVE: spc.noaa.gov