Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA
Issued by NWS San Joaquin Valley, CA
116 FXUS66 KHNX 101112 AFDHNX Area Forecast Discussion National Weather Service Hanford CA 312 AM PST Wed Dec 10 2025 .UPDATE...Updated Air Quality and Aviation sections. && .KEY MESSAGES... 1. Fog and low clouds will continue each night and morning across the San Joaquin Valley this 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 across the mountains and desert this week, as the high pressure pattern continues over the region. && .DISCUSSION... Central California saw very little change in the last 24 hours as low clouds covered the San Joaquin Valley. The stagnant weather pattern is still in place over the Southwest as the region remains dry. While outside of the San Joaquin Valley, temperatures across the Mountains and Kern Desert have seen a slow rise conditions warm under the ridge of high pressure. Over the next 2 to 3 days, probability of seasonal normal values across the valley struggle to reach any percentage higher than 20 percent. On the contrary, outside of the San Joaquin Valley, the probability of reaching 65 degrees for elevations below 6,000 feet sits between 60 and 90 percent. With these high percentage value showing up for much of the week, will expect little change in the stratus plaguing the San Joaquin Valley. In the realm of precipitation, ensemble moisture analysis is showing the blocking high maintaining its position over the Eastern Pacific, and placing the steering current in the direction of the Pacific Northwest. With little change in the next 5 day, Central California will remain dry and covered in low clouds. Longer range ensemble analysis does show a change in the pattern with a hint toward the introduction of precipitation as early as next Tuesday (16 Dec 2025). Ensemble analysis still hints toward precipitation around the middle to late next week. Yet, uncertainty is still too high on the actual magnitude of the next storm. Further analysis is needed to gauge the next storm potential. && .AVIATION... IFR to MVFR ceilings and visibilities are expected to prevail for much of the San Joaquin Valley during the next 24 hours. 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 mountain and desert areas over the next 24 hours. && .AIR QUALITY ISSUES... On Wednesday December 10 2025, Unhealthy for Sensitive Groups in Fresno, Kern, Madera, and Tulare Counties. Fireplace/Wood Stove Burning Status is: No Burning For All in Fresno, Kern, and Madera Counties. No Burning Unless Registered in Kings, 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 this morning for CAZ300-304- 308-313-316>322-334>336. && $$ Molina/BSO weather.gov/hanford