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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).

Saturday, September 18, 2021

SPC Sep 18, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1114 AM CDT Sat Sep 18 2021 Valid 181630Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING OVER PARTS OF THE GREAT BASIN... ...SUMMARY... A few storms may produce severe wind and/or hail this afternoon and evening across parts of the Great Basin region. ...Great Basin... Water vapor loop shows a strong upper trough digging onto the coast of OR, with a lead shortwave trough lifting northeastward across CA/NV toward UT. Large scale forcing is overspreading parts of NV/AZ/UT, resulting in increasing coverage of thunderstorms. This activity will spread northeastward across much of UT this afternoon, and eventually into southern ID/WY. Instability will be limited due to marginal moisture values and pockets of cloudiness. However, rather strong southwesterly flow will result in fast-moving showers and thunderstorms capable of gusty and locally damaging winds. Hail will also be possible in the higher terrain of northwest AZ into central UT. ..Hart/Squitieri.. 09/18/2021 Read more LIVE: spc.noaa.gov
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