SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1106 AM CST Mon Dec 21 2020 Valid 221200Z - 231200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Tuesday. ...Synopsis... A progressive upper level pattern will bring a digging shortwave trough eastward from the western U.S. to the Plains by the end of the period. A surface low attendant to the trough will likely track eastward along the international border near MT toward the upper Great Lakes. A trailing cold front will push east/southeast across the northern and central Plains during the afternoon and overnight hours, with the front oriented from northeast MN into central OK and northwest TX by Wednesday morning. Modest Gulf return flow is expected ahead of the front, with dewpoints in the 50s F reaching as far north as the Red River along the OK/TX border. Some shower activity is possible across parts of central into northern TX after 06z in this warm advection regime. However, moisture return is expected to be modest and even elevated instability will be meager. While a lightning flash or two could occur towards the very end of the forecast period, thunderstorms do not appear likely before 12z Wednesday. ..Leitman.. 12/21/2020
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