Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA
Issued by NWS San Joaquin Valley, CA
676 FXUS66 KHNX 070659 AFDHNX Area Forecast Discussion National Weather Service Hanford CA 1059 PM PST Sat Dec 6 2025 .UPDATE... AQ and Aviation Updated && && .KEY MESSAGES... 1. Fog and low clouds will continue each night and morning across the San Joaquin Valley into early next week. Dense fog will also develop at times in the lower Sierra foothills, coastal ranges, and the Grapevine. 2. A gradual warming trend will occur in the mountains and desert until next week, as the high pressure pattern continues over the region. && .DISCUSSION... Overcast conditions continue to linger over the San Joaquin Valley this morning, with foggy conditions and low visibilities in the foothill areas where the cloud deck is interacting with the local terrain. Clearing is less favorable today compared to previous days due to a prominent high pressure ridge building in from the west. This ridge will maintain the low level temperature inversion currently in place for much of the day, keeping the moisture trapped around one thousand feet above ground level. With minimal clearing, fog has less potential for tomorrow morning in the valley areas, with less than a 30 percent chance for visibilities less than a quarter mile. These chances improve to 50 to 60 percent for the foothill areas of the Sierra Nevada, Kern County Mountains, and the Coastal Range. This pattern is expected to continue through the weekend as the high pressure remains present over the region. As we move into next week, cluster analysis expresses confidence in the high pressure strengthening over central California. As the high pressure builds, a warming trend will take place, especially in the area mountains and foothills where afternoon highs will rise well above season averages. By Wednesday, areas including (but not limited to) Oakhurst, Tehachapi, and Three Rivers have a 50 to 60 percent probability to exceed 65 degrees, some five to ten degrees above season average. Yosemite Valley, which averages around 45 degrees at this time of year, has a 70 to 80 percent probability to exceed 70 degrees Wednesday, Thursday, and Friday of next week. && .AVIATION... IFR to MVFR ceilings and visibilities are expected to prevail for much of the San Joaquin Valley. These conditions will continue through 18Z Sunday. LIFR conditions will also persist in the coastal ranges, Sierra foothills, and the Kern County mountains due to the low stratus deck. Otherwise, VFR conditions will prevail in the Sierra Nevada and in the Kern County Mountains and Desert over the next 24 hours. && .AIR QUALITY ISSUES... ISSUED: 12/06/2025 15:02 EXPIRES: 12/07/2025 23:59 On Sunday December 7 2025, Unhealthy for Sensitive Groups in Fresno and Kern Counties. Fireplace/Wood Stove Burning Status is: No Burning For All in Fresno and Kern Counties. No Burning Unless Registered in Kings, Madera, Merced, and Tulare Counties. Burning Discouraged in Kern (Greater Frazier Park Area) and Sequoia National Park and Forest. && .CERTAINTY... The level of certainty for days 1 and 2 is high. 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 until 11 AM PST Sunday for CAZ300-335. && $$ public...SM aviation....JPK weather.gov/hanford