The primary focus of today’s brief centers on the significant impacts of a powerful Pacific storm train, which is anticipated to bring excessive rainfall and heavy snow across various regions, particularly California, Nevada, and the Pacific Northwest. We begin by addressing the heightened risk of flooding in California, where coastal downpours are likely to raise river levels and exacerbate travel difficulties due to road closures and chain controls in mountainous areas. As the storm progresses, we will see its effects extend into Nevada and other states, with advisories for high winds and winter weather being issued.

Takeaways:

* A powerful Pacific storm train is currently affecting multiple regions across the United States.

* California faces a slight risk of excessive rainfall, impacting coastal areas and Sierra Nevada mountains.

* Travelers should anticipate road closures and chain control requirements due to severe weather conditions.

* Nevada has winter storm warnings in place, with significant snow expected in various counties.

* Wind and rain are expected to increase in Washington, accompanied by flood warnings in certain areas.

* Arizona will experience moisture from the Pacific storm, leading to potential flooding and winter weather advisories.

Sources

[USGS M4.5+ Past Day | https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/4.5_day.geojson]

[NWS Bay Area | https://www.weather.gov/mtr/]

[NWS Hanford (San Joaquin Valley/Sierra) | https://www.weather.gov/hnx/]

[NWS LOX Gale Warning | https://forecast.weather.gov/wwamap/wwatxtget.php?cwa=lox&wwa=gale+warning]

[WPC — Excessive Rainfall (CA Slight Risk today) | https://www.wpc.ncep.noaa.gov/qpf/ero.php?day=1&opt=curr]

[SFGATE — Bay Area flood watch & storm timing | https://www.sfgate.com/bayarea/article/flood-watch-bay-area-through-christmas-21256885.php]

[NWS Reno — Warnings/Travel briefing | https://www.weather.gov/rev/]

[NWS Las Vegas — Flood Watch & wind messaging | https://www.weather.gov/vef/]

[NWS Reno — Flood Watch text (issued 1:45 AM PST) | https://forecast.weather.gov/wwamap/wwatxtget.php?cwa=usa&wwa=flood+watch]

[NWS Portland — hazards | https://www.weather.gov/pqr/]

[WPC — CA-to-OR heavy rain corridor (Slight/Marginal) | https://www.wpc.ncep.noaa.gov/qpf/ero.php?day=1&opt=curr]

[NWS Seattle — hazards & hydrology | https://www.weather.gov/sew/]

[NWS Phoenix — Flood Watch & event timeline | https://www.weather.gov/psr/]

[NWS Flagstaff — winter headlines | https://www.weather.gov/fgz/]

[NWS Buffalo — Hazardous Weather Outlook (Lake Ontario counties) | https://www.weather.gov/buf/BUFHWOBUF]

[NWS Buffalo — hazards | https://www.weather.gov/buf/]

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