Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA
Issued by NWS San Joaquin Valley, CA
293 FXUS66 KHNX 051812 AFDHNX Area Forecast Discussion National Weather Service Hanford CA 1012 AM PST Fri Dec 5 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 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... Model ensembles are in a strong agreement that the ridge of high pressure will move onshore but remains strong and in place. The subsidence often found in the ridges will help keep the stratus and fog pattern going for a few more days which will keep the San Joaquin Valley cooler than average. However, the NBM is still showing 50 to 100 percent chances of high temperatures cracking 50 degrees for the next week. The stratus also will lead to fog over some of the passes including Pacheco and Tejon Pass over the next few days. However, eastern Kern County and the Sierra Nevada foothills and mountains will have increasing temperatures with the ridge. The desert area even has a 65 to 80 percent chance of highs of at least 70 degrees by Wednesday of next week. The latest CPC outlooks have the Valley, the Sierra Nevada, and the Mojave Desert under a 70 to 90 percent chance of above average temperatures due to the persisting ridge. However, the outlooks show a shift from a 40 to 50 percent probability of below average precipitation to a 33 to 40 percent probability of above average precipitation for the much of the Valley and Sierra Nevada. && .AVIATION... IFR visibilities are expected to persist through 21Z for much of the Valley before improving to MVFR. MVFR to IFR ceilings will continue through 21Z. After 21Z, there is a 50 to 95 percent chance of MVFR to VFR ceilings through 6Z. After 6Z, MVFR to IFR conditions will return. LIFR conditions are possible in the foothills due to the low stratus deck. && .AIR QUALITY ISSUES... On Friday December 5 2025, Fireplace/Wood Stove Burning Status is: No Burning Unless Registered in Fresno, Kern, Madera and Merced Counties. Burning Discouraged in Kings and Tulare Counties, 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 until 1 PM PST this afternoon for CAZ300. Dense Fog Advisory until 11 AM PST this morning for CAZ314-316- 335. && $$ JPK weather.gov/hanford