Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA
Issued by NWS San Joaquin Valley, CA
863 FXUS66 KHNX 132303 AFDHNX Area Forecast Discussion National Weather Service Hanford CA 403 PM PDT Fri Jun 13 2025 .UPDATE... Updated Aviation Section. && .KEY MESSAGES... 1. Minor Heat Risk will be present for most of the lower elevations today with Moderate Heat Risk in the Kern County Desert. 2. Drier air will cause minimum relative humidity to fall between 10 and 20 percent for much of the region through the forecast period. 3. A minor cooling trend continues into the weekend with seasonably warm temperatures by Saturday. 4. Stronger wind gusts are possible in the Mojave Desert Slopes later this evening with a 40 to 60 percent chance to exceed 35 mph. && .DISCUSSION... Seasonable temperatures will continue across the lower elevations of central California today as zonal flow causes winds to propagate from the west. Much of the incoming air will be drier than in previous weeks and widespread minimum relative humidity values 10 to 20 percent are expected as a result. As we move further into the weekend, the zonal pattern will erode as an upper level trough makes its way through the Pacific Northwest region. Cyclonic flow around the trough will cause flow over central California to shift from the southwest, resulting in temperatures a few degrees cooler than during the work week and near average for this time of year. Some elevated winds are possible across the area, especially on the east side of the Sierra, in the Mojave Desert, and in wind-channeling terrain. The aforementioned trough is favorable to hold stationary through the early portion of next week before progressing further eastward Tuesday afternoon. High pressure will gradually build in, causing warmer temperatures to return; there is a 20 to 60 percent chance for 100 degree highs for Wednesday and Thursday. However, these will be short-lived as ensemble guidance shows increasing potential for another trough to approach the Pacific coast late next week. && .AVIATION... 00Z Update: VFR conditions will prevail for the next 24 hours across the Central California Interior. && .FIRE WEATHER... Minor risk for fire development through the weekend and into next week due to low minimum relative humidity values between 10 and 20 percent. The greatest threat for new fires will be in areas with cured fine fuels, though the upcoming low RH`s will cause a relatively sharp decrease in 100-hr fuel moisture. Wind gusts across the valley areas will reach 15 to 20 knots each day. && .AIR QUALITY ISSUES... ISSUED: 06/12/2025 15:01 EXPIRES: 06/13/2025 23:59 None. && .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... None. && $$ public/aviation...mccoy weather.gov/hanford