...A slow-moving cold front will be the focus for heavy rain and a threat
of severe weather today and Thursday...
...Much cooler conditions for the Pacific Northwest...with scattered
convection and high-elevation snowfall possible through Thursday...
A slow-moving upper trough and its associated surface cold front edges slowly eastward across the eastern half of the US during the next few days...reaching the Atlantic coast on Friday morning.
Warm humid air ahead of the front...courtesy of a southerly flow off the Gulf of Mexico will allow showers and thunderstorm development to produce locally heavy rainfall and the threat of severe weather for the Ohio Valley today and tonight.
These conditions will translate to the East Coast on Thursday and
Thursday evening. Please refer to the Storm Prediction Center for the
latest information and updates on the severe weather potential through Thursday night.
Out west...a deep Pacific cold front will slowly migrate eastward across the Intermountain West...with localized snowfall possible across the Washington Cascades and Olympic Mountains. Across the northern Rockies and lee of the Cascades...gusty winds... scattered showers and isolated thunderstorms will accompany the front which surges to the Continental Divide tonight and early Thursday. This front then stalls along the Divide until late Thursday night into Friday morning. With an easterly flow from the Plains over running the slowing front from central Montana into southern Wyoming... additional precipitation is expected to develop east of the Divide.