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Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Washington CWSU

Center Weather Service Unit

PDWB_PCT

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The Pre-Duty Controller Weather Briefing is designed to increase controller situational awareness. It is produced by the Center Weather Service Unit three times daily. After hours or during changing weather this briefing may not represent the latest information. This product does not replace pilot pre-flight briefings.

 

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DCA

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DC Metro Gate Forecast website here.

.AVIATION /18Z TUESDAY THROUGH SUNDAY/... Mainly VFR conditions are expected through Thursday across the area. Canadian high pressure initially centered over the region will gradually push offshore tonight. Some elevated breezes continue into the evening/night. Removed LLWS from the TAFs given not much directional change with height and a steady surface wind persisting through much of the night. By Wednesday, southerly winds further increase ahead of a quick moving clipper system. Some brief restrictions are possible 15Z-21Z Wednesday at northern terminals as light precip tracks through. Otherwise, most stay dry through the day with southerly gusts to around 20 to 25 knots. The accompanying cold front races across the region by Wednesday evening which ushers in a gusty west-northwesterly wind in the wake. Northwesterly breezes remain elevated into Thursday as an upper low passes to the north. VFR conditions are expected Friday morning. Sub-VFR conditions appear possible Friday afternoon into Friday evening, and then potentially again Saturday night in association with snow. Winds are forecast to be out of the southwest on Friday, before turning out of the west on Saturday. AVIATION...BRO/DHOF/KJP Update as of: 207 PM EST Tue Dec 9 2025

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