Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA
Issued by NWS San Joaquin Valley, CA
138 FXUS66 KHNX 040855 AFDHNX Area Forecast Discussion National Weather Service Hanford CA 1255 AM PST Thu Dec 4 2025 .KEY MESSAGES... 1. Fog and low clouds will continue each night and morning across the San Joaquin Valley for the remainder of this week. Fog will also continue through this afternoon along the Interstate 5 corridor through the lower portions of the Grapevine. 2. A dry disturbance will introduce increasing winds across the deserts and mountain peaks until Thursday; cold morning lows also anticipated for the high Sierra. && .DISCUSSION... Low clouds mainly persist in the San Joaquin Valley into the lower Sierra Nevada foothills and Kern County mountains. Some dense fog, however, will linger towards the base of the Grapevine to elevations just above 2,000 feet into this afternoon. Thus, have issued a Dense Fog Advisory for this particular area until 3 PM this afternoon. Additional fog development tonight into Thursday morning will depend on whether the low clouds clear out over the Central Valley by this afternoon. Some high clouds may also delay fog development tonight, as well as eroding the stratus cloud deck. At this time, we are seeing about a 50-70 percent chance for visibilities to drop below one quarter of a mile late tonight until late Thursday morning. As for the higher elevations of the Sierra Nevada, expect cold overnight lows combined with strong and gusty winds tonight into Thursday morning. A Cold Weather Advisory remains in effect for these areas until 9 AM PST Thursday, due to a passing upper- level disturbance. Otherwise, seasonably cool weather will continue into next week, though with mainly dry conditions. Increased probabilities of below average precipitation will last for at least the next week or two, which includes up to a 50-60% chance for the 6-10 day period, per the Climate Prediction Center. For the Central Valley, this will mean either dense fog in the nights and mornings or a persistent stratus deck. && .AVIATION... MVFR visibility and ceilings will persist across the San Joaquin Valley for the next 24 hours. VFR condition expected elsewhere. Between 12Z and 18Z today...a 30% to 50% chance of IFR visibility and a 50% to 65% chance of IFR ceilings will exist across the San Joaquin Valley. && .AIR QUALITY ISSUES... On Thursday December 4 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... Cold Weather Advisory until 9 AM PST Thursday for CAZ323- 326>328-330-331. && $$ Aviation....Molina weather.gov/hanford