SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1245 AM CST Thu Dec 24 2020 Valid 251200Z - 261200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected on Friday. ...Synopsis... A deep upper trough and embedded closed circulation will be in place over the eastern CONUS early Friday morning. This upper trough is forecast to progress northeastward, moving through the Mid-Atlantic and ending the period with strong negative tilt from eastern Ontario/western Quebec to off the NC coast. Upper ridging will also be in place west of this trough, from northern Mexico into Alberta. This ridge is expected to progress eastward into the High Plains while dampening. Farther west, a shortwave trough is expected to move into the Pacific Northwest late in the period. At the surface, low associated with the eastern CONUS trough 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. Strong forcing for ascent and cold temperatures aloft will accompany the shortwave trough approaching the Pacific Northwest, 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.. 12/24/2020
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