SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1053 AM CST Fri Jan 22 2021 Valid 231200Z - 241200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected across the U.S. on Saturday. ...Synopsis... An upper shortwave trough, embedded in the larger-scale western U.S. trough will dig along the CA coast during the day on Saturday, before ejecting eastward over northwest Mexico and the lower Colorado Valley. Forecast soundings near the southwest CA coast and nearby mountains indicated cooling temperatures aloft, resulting in steepening lapse rates. Instability will remain low, generally less than 150 J/kg MUCAPE, but sufficient given strong forcing, and isolated thunderstorms are possible. Further east, an upper trough will move offshore from the Atlantic coast, replaced by a weak upper ridge across the eastern half of the CONUS. Surface high pressure over the Midwest will slowly shift east toward the Mid-Atlantic/central Appalachians, mitigating much in the way of Gulf return flow. As such, dry and stable conditions will persist for much of the period, and thunderstorms are not expected east of the Rockies. ..Leitman.. 01/22/2021
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