A deep upper-level low will push off into the western Atlantic this weekend, putting an end to a period of sustained light precipitation across the Great Lakes and Northeast.
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Light rain, scattered to isolated thunderstorms and snow showers are likely to persist across the Great Lakes, Ohio Valley and interior Northeast today before winding down on Sunday.
Cool air will filter into the eastern half of the country on the backside of the associated surface cold front through Sunday.
Another deep upper trough centered over central Canada will eject a pair of surface low pressure systems into the Great Plains today.
Some light rain/snow showers and thunderstorms are possible along the Front Range through Sunday.
By Sunday night the more southern system will arrive over the Midwest, bringing with it the chance for additional thunderstorm activity.
The threat of severe weather remains marginal for the midsection of the country this weekend.
Warm air will ride out ahead of this system and spread from the Great Plains on Saturday to the Mississippi Valley on Sunday.
A colder airmass will settle over the Northwest this weekend as the aforementioned cold front sweeps through the Rockies today.
A sustained period of moderate to heavy rainfall and heavy mountain snow are set to ensue over the Pacific Northwest this weekend as onshore flow and a subsequent shortwave pull moisture into the region.
Some scattered to isolated thunderstorms are possible over parts of the coastal and inland Pacific Northwest today.
Light to moderate snowfall is also expected over parts of the Northern Rockies through the Weekend.
The Cascades will experience a weekend of heavy snow with accumulations of 1-2 feet likely.
A deep low pressure system is forecast to arrive over the Pacific Northwest by Monday morning.
This system is forecast to carry a substantial amount of Pacific moisture, but there is some lingering uncertainty with respect to its timing and track at the moment. ■