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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).

Tuesday, August 3, 2021

SPC Aug 4, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0730 PM CDT Tue Aug 03 2021 Valid 040100Z - 041200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF EASTERN WASHINGTON/OREGON AND COASTAL NORTH CAROLINA... ...SUMMARY... Isolated severe thunderstorms remain possible this evening over parts of central/eastern Oregon and Washington into far western Idaho. A low-probability risk for a brief tornado is forecast across far eastern North Carolina overnight. ...01z Update... Only minor changes have been made to the 20z outlook, mostly to reflect latest lightning trends. Latest water-vapor imagery depicts a substantial short-wave trough progressing inland along the WA Coast. Deep convection has developed in two primary areas ahead of this feature, the strongest being thunderstorm clusters east of the Cascade Range where surface temperatures warmed into the 90s. This activity is likely producing gusty winds and perhaps marginally severe hail. Another cluster of storms developed in closer proximity to the upper ridge over eastern OR. This air mass is a bit drier but gusty winds may also be noted with this convection for the next few hours. Large-scale support should aid longevity of convection across WA as heights will be more suppressed near the international border overnight. Numerous showers and isolated thunderstorms continue across the eastern portions of NC, extending southwest along the coast into southeastern GA. Will maintain low tornado probabilities for any weak supercells that evolve within this marginally supportive environment. ..Darrow.. 08/04/2021 Read more LIVE: spc.noaa.gov
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