US Short Term Forecast to Sep 24

...Moderate to heavy rainfall expected along the I-95 corridor through
early Sunday morning...

...A stalled front will lead to unsettled conditions over the Gulf Coast

...Light snowfall accumulations are possible over sections of Western CO on Monday...

A rather potent upper trof currently advancing through the lower Great
Lakes is dragging a cold front toward the Eastern Seaboard.

Anomalous moisture content emerging from the Gulf of Mexico will continue to fuel periods of moderate to heavy rainfall along and ahead of the frontal zone.

The progressive nature of this system should allow for improving
conditions by midday Sunday over much of the Northeastern U.S. as high pressure builds in from the west. The exception to this will be across upper New England as the closed upper low crosses overhead leading to persistent rainfall until late Sunday.

As the aforementioned upper trof continues lifting north and east toward Nova Scotia late in the period, the associated frontal boundary is forecast to stall along the Gulf Coast region.

Lift along the boundary in combination with enhanced moisture levels and local sea breeze effects will maintain a threat for thunderstorms into early next week. The better chance for heavier rainfall amounts will be near the series of surface waves expected along the stalled front.

The upper pattern over the West to conclude the weekend and entering next week will feature a persistent trof resulting in cool and inclement weather.

The initial system currently advancing through the San Francisco Bay Area will keep rain in the forecast through this evening before bringing the threat to more interior locations.

The models agree this upper trof will intensify while moving through the Four Corners region aiding in widespread precipitation over the Central Rockies by Sunday afternoon.

It appears snow levels should fall enough to support light accumulations over the highest elevations of Western CO. While this system marches into the Central Plains by Monday morning, another series of impulses are expected to advance into the Pacific Northwest.

In response, the onshore flow will increase with moderate to heavy rainfall across coastal WA and OR. Orographics will as usual play a key role in locally enhancing amounts across the Olympics and Cascades.

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