Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA
Issued by NWS San Joaquin Valley, CA
218 FXUS66 KHNX 242351 AFDHNX Area Forecast Discussion National Weather Service Hanford CA 351 PM PST Mon Nov 24 2025 .UPDATE... Updated Aviation and Air Quality Issues Sections. && .KEY MESSAGES... 1. Dense Fog Advisory issued for the San Joaquin Valley valid from 12AM Tuesday morning through 1 PM Thursday due to persistent chances for fog each night and morning through that timeframe. 2. Temperatures near to just below season averages through the week. Low probability for freezing temperatures in the Mojave Desert for much of the week, high probability for the Sierra Nevada. 3. Indications for a low pressure system over the western US to end the month, though uncertainty remains for exact location and impacts for central California. && .DISCUSSION... Latest model ensembles have the ridge of high pressure moving onshore today in tomorrow but also strengthening. The ensembles agree that it will be remain strong for much of the week. This ridge will help keep the atmosphere stable for fog formation every morning this week. A Dense Fog Advisory is in effect through 11 AM this morning. High temperatures will remain near to just below seasonal normals through Thursday. In the Desert areas near Edwards AFB, the latest NBM has a 20 to 35 percent chance of below freezing lows through Wednesday morning before becoming 10 to 20 percent for the rest of the week. The model ensembles have a trough sliding into Nevada late Friday and Saturday into Sunday. This will help bring temperatures down in the Valley. However, the latest ensembles and NBM have any possible precipitation coming in later as Saturday has a 10 to 15 percent chance of rain accumulating but Sunday is more favorable at a 45 to 50 percent chance of any rain for the Valley and snow in the Sierra Nevada. However, this trough is expected to be cold by the ensembles as it is tilted towards a very deep cold airmass that will be over Nunavut and northern Manitoba and Ontario provinces. && .AVIATION... IFR ceilings are expected to persist throughout the Valley through at least 18Z Tuesday, with IFR/LIFR visibilities expected to return by 09Z Tuesday. && .AIR QUALITY ISSUES... On Tuesday November 25 2025, Fireplace/Wood Stove Burning Status is: No Burning Unless Registered in Fresno, Kern, Kings, Madera, and Tulare Counties. Burning Discouraged in Merced County and Kern (Greater Frazier Park Area) and Sequoia National Park and Forest. && .CERTAINTY... The level of certainty for days 1 and 2 is medium. The level of certainty for days 3 through 7 is medium. Certainty levels include low...medium...and high. Please visit www.weather.gov/hnx/certainty.html for additional information and/or to provide feedback. && .HNX WATCHES/WARNINGS/ADVISORIES... Dense Fog Advisory from midnight tonight to 1 PM PST Thursday for CAZ301>303-305>307-309>312-314-315. && $$ public/aviation...JPK/EW weather.gov/hanford