The primary focus of today's discourse pertains to the impending atmospheric conditions that are anticipated to impact various regions across the western United States, particularly California. A rapidly advancing atmospheric river is expected to instigate flood watch conditions spanning from the Yosemite Valley and Sierra foothills into the Southern Cascades, while a robust onshore flow will generate wind advisories within the Sacramento Valley and inclement winter weather in the High Sierra. Furthermore, the Weather Prediction Center has indicated a significant likelihood of flash flooding across central Northern California, particularly in urban areas. In addition, the episode delineates the potential hazards of rock falls and debris flows in proximity to recently burned areas, emphasizing the manifold risks associated with these weather patterns. As we navigate through these forecasts, we remain committed to providing timely and pertinent information to ensure the safety and preparedness of our listeners.

Takeaways:

• The atmospheric river is bringing significant flood watch conditions across various regions in California.
• Flash flooding is highly probable in central Northern California, particularly in urban areas today.
• Winter storm warnings are in effect for Mono County, predicting hazardous travel conditions.
• High surf advisories are in place for Hawaii's east-facing shores, with surf reaching heights of 14 feet.
• Nevada is experiencing expanded winter headlines, indicating severe weather near the Sierra front.
• Coastal regions of Oregon and Washington are under small craft advisories due to rough sea conditions.

Sources

[NWS/WPC MPD | https://www.wpc.ncep.noaa.gov/metwatch/metwatch_mpd_multi.php?md=1221&yr=2025]

[NHC | https://www.nhc.noaa.gov/]

[SPC Day 1 Outlook | https://forecast.weather.gov/product.php?site=JKL&issuedby=DY1&product=SWO&format=txt&version=1]

[NWS/WPC MPD | https://www.wpc.ncep.noaa.gov/metwatch/metwatch_mpd_multi.php?md=1221&yr=2025]

[NWS Hanford — Flood Watch | https://forecast.weather.gov/product.php?issuedby=HNX&product=ZFP&site=NWS]

[NWS Sacramento — Advisories | https://www.weather.gov/sto/]

[NWS Reno — Winter Storm Warning | https://forecast.weather.gov/showsigwx.php?warnzone=CAZ073&warncounty=CAC051&firewxzone=CAZ274]

[NWS Los Angeles — Surf/Rip Current | https://forecast.weather.gov/product.php?issuedby=LOX&product=SRF]

[NWS Honolulu —

Watches/Warnings | https://www.weather.gov/hfo/watchwarn]

[Hawaii News Now — Advisory extended | https://www.hawaiinewsnow.com/2025/11/12/high-surf-advisory-extended-east-shores/]

[NWS Reno — Warning/Advisories | https://www.weather.gov/rev/]

[NWS Reno — Winter Storm Warning text | https://forecast.weather.gov/product.php?issuedby=REV&product=WSW&site=rev]

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

[NWS Medford — Wind Advisory | https://forecast.weather.gov/zipcity.php?inputstring=Medford%2COR]

[NWS Seattle — Marine AFD | https://forecast.weather.gov/product.php?issuedby=sew&product=AFD&site=sew]

[NWS Marine — East Entrance Strait (PZZ132) | https://marine.weather.gov/MapClick.php?zoneid=pzz132]) National Weather Service+1]