National Weather Service Weather Prediction Center Extended Forecast Issued November 11: Multiple Rounds of Rain and Mountain Snow for the West Coast from November 14 to 18, Locally 1 to 2 Inches Near the Texas Gulf Coast
United States — The National Weather Service Weather Prediction Center issued a preliminary extended forecast discussion at 2:20 a.m. Eastern Time on November 11, 2026, valid from November 14 to 18, saying an amplified upper level flow pattern will be in place, with large scale troughs encompassing both the West Coast and the East Coast.
Multiple rounds of rain and mountain snow are expected from California to Washington, and a return to colder weather across the East Coast region with some lingering lake effect and upslope precipitation, the center said.
The first round of frontal boundaries will arrive on Friday across California, and then reach the Intermountain West by Saturday with valley rain and mountain snow.
A second and stronger front heralds the arrival of colder conditions with lowering snow levels across the Sierra and northern California ranges, with moderate accumulations likely, the center said.
South of the ridge, a southern stream trough crossing from the Desert Southwest to the southern Plains through Monday will likely bring showers and storms to parts of Texas and the Gulf Coast region in general, according to the discussion.
Another area of moderate to locally heavy rainfall is also expected across portions of southern Texas over the weekend, with locally 1 to 2 inches possible near the Texas Gulf coast as a wave of low pressure develops, the center said.
The center said the model guidance suite features good overall agreement across the United States domain for this weekend. The figures above are from the forecast discussion text and remain subject to updated forecasts.
Published by GSM · USA (original Chinese edition)
Photo: 图：卫星云图上覆盖美国西海岸的风暴云系。GOES imagery: CSU/CIRA & NOAA 供图，公共领域，经 Wikimedia Commons / Photo: Storms Batter the California Coast (CIRA 2023-12-21). By GOES imagery: CSU/CIRA & NOAA, public domain, via Wikimedia Commons
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