SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0214 AM CST Wed Dec 23 2020 Valid 251200Z - 261200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Friday. ...Synopsis... A deep upper trough, with an embedded closed circulation over the middle OH Valley, will cover the eastern CONUS early Friday morning. Very strong flow aloft will surround this system as it gradually moves eastward throughout the day. An associated surface low will begin the period over eastern Ontario/southern Quebec. A cold front will extend southeastward from this low to just off the southern New England coast before arcing more southward. With the front already offshore by early Friday morning and stable conditions in its wake, no thunderstorms are expected across the central and eastern CONUS. Farther west, upper ridging initially in place over the western CONUS will gradually progress eastward as a shortwave trough approaches the Pacific Northwest. Strong forcing for ascent and cold temperatures aloft will accompany this shortwave, and a lightning flash or two may occur in the deeper convection within the frontal band offshore. However, any lightning is not expected to continue once the band moves onshore. ..Mosier.. 12/23/2020
There’s more click here.