Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 150 PM EST Mon Nov 11 2024 Valid 00Z Tue Nov 12 2024 - 00Z Thu Nov 14 2024 ...An Atmospheric River will bring heavy, low elevation rain and high elevation mountain snow to the Pacific Northwest and northern California beginning Tuesday evening... ...Lingering precipitation chances for the Northeast and Carolinas Monday with some locally heavier rainfall along the Lower Mississippi/Tennessee Valley areas... ...Above average temperatures continue for much of the country, more seasonable temperatures for the Northeast and the West on Tuesday... A deep upper-level trough will bring a substantial plume of Pacific moisture to the Northwest U.S. beginning Tuesday evening. This atmospheric river event will produce low elevation rainfall along with high elevation heavy snowfall throughout the day on Wednesday. Between 1-3 feet of snow can be expected over the highest elevations of the Cascades while between 1-2 feet of snow are possible for parts of the Northern/Central Rockies by Wednesday evening. Some light precipitation may occur from the Lower Great Lakes into the Northeast through Tuesday morning. Light rain is probable out ahead of a cold front moving through the Northeast tonight before transitioning into post-frontal light mixed precipitation early Tuesday morning when temperatures bottom out in the 20s and winds begin to blow out of the northwest. Mid-level troughing above a low pressure system moving through the Mississippi Valley will support return flow of moisture from the Gulf of Mexico leading to showers and thunderstorm activity across the Mississippi Valley and Midwest/Southeast on Wednesday and Thursday. Some pockets of heavy rainfall are possible over the Lower Mississippi/Tennessee Valley on Wednesday. Temperatures are likely to remain above average across much of the Central and Southern U.S. this week. Cold fronts moving through the East and West will support below average temperatures over the next couple of days. Kebede Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php