US Short Term Forecast to Oct 1

...Wet and windy conditions expected for the Pacific Northwest into

...A narrow band of showers and thunderstorms should accompany a cold front sweeping through the Mississippi Valley and Great Lakes....

A wet pattern continues over the northwestern corner of the Country into Monday due to a deep vortex spinning off the British Columbia coast, dragging a slug of moisture into the region due to significant onshore flow from the Pacific ocean.

Upper-level energy rotating around the main vortex will push a pair of frontal boundaries and related surges of moisture across the Pacific Northwest. The anomalous moisture will fuel widespread moderate to heavy rains within showers and thunderstorms moving across the region...with the heftiest totals expected along the favored western slopes of the terrain.

Enough moisture should spill inland to produce heavy rains across the Northern Continental Divide. In addition to the soaking rains... winds will become strong and gusty as the pressure gradient increases over the Northwest. Snows should pick up in the wake of the second system Sunday night into Monday across the higher levations of the Washington Cascades.

Showers and thunderstorms will continue to light up along a cold front
sweeping through the Mississippi Valley and Great Lakes.

As upper level energy lifts northeast into Canada...precipitation will become increasingly sparse as minimal inflow from the Gulf of Mexico weakens with time.

Strong surface ridging and cold air advection around the western side of an ocean cyclone should keep much of the Eastern Seaboard rain-free during the short range period. Low-level northeasterly flow off the Atlantic could bring showers and thunderstorms inland across Florida and the Carolina coast.

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