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Short Range Public Discussion
(Caution: Version displayed is not the latest version. - Issued 0737Z Dec 04, 2023)
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Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 237 AM EST Mon Dec 04 2023 Valid 12Z Mon Dec 04 2023 - 12Z Wed Dec 06 2023 ...Excessive rainfall and instances of flooding are likely across parts of western Washington and Oregon over the next few days... ...Moderate snowfall to diminish throughout northern New England today... ...Heavy upslope snow potential forecast across the central Appalachians Tuesday night into Wednesday... A strong atmospheric river is anticipated to soak the Pacific Northwest today and continue the heavy rainfall potential through midweek. Main impacts associated with this storm system are expected to include the threat of flooding caused by heavy rainfall and snowmelt. A broad stream of anomalous atmospheric moisture content extending from just north of Hawaii is forecast to move inland into western Washington and Oregon by tonight along a frontal boundary, which is also connected to a very strong low pressure system entering the Gulf of Alaska. The subtropical connection will lead to a very mild system with high snow levels. This means much of the Cascades and coastal ranges will experience heavy rain as opposed to heavy snow, exacerbating the potential flood threat due to increased runoff. Flood Watches have been issued for much of western Washington and Oregon, where most areas could see 2-3"+ rainfall amounts by Wednesday. Moderate rainfall may also extend east of the Cascades and into northern Idaho. Residents are advised to never drive through flooded roadways and have an action plan to protect property if within a flood zone. Outside of the Northwest, mostly light precipitation is forecast throughout the rest of the country by midweek. The ongoing snowstorm impacting northern New England is forecast to slowly subside today. A few additional inches of snowfall are expected across northern Vermont and New Hampshire, as well as much of Maine, which could lead to treacherous travel early this morning. The next system spreading snowfall potential into parts of the U.S. will be an Alberta Clipper diving from the Dakotas today to off the North Carolina coast on Wednesday. Strong winds are expected as the low pressure system moves across the northern Plains today, which has prompted High Wind Warnings and Wind Advisories for parts of Montana, Wyoming, and the Dakotas. Scattered snow showers will also accompany this system until feeding the upslope snow potential across the central Appalachians beginning Tuesday night. Subfreezing temperatures along the Allegheny Front and increased moisture due to northwesterly flow into the terrain will allow for potentially heavy snow. WPC probabilities for at least 4" of snow reach to around 40-60% in the higher terrain of West Virginia on Wednesday. Snell Graphics available at