908 FXUS66 KHNX 071805 AFDHNX Area Forecast Discussion National Weather Service Hanford CA 1105 AM PDT Mon Jul 7 2025 && .KEY MESSAGES... 1. Elevated fire weather conditions for Northwest Kern County this afternoon due to low RH around 20 percent and stronger wind gusts near 30 MPH. 2. Temperatures near season averages across the region today before a gradual warm up into the triple digits later this week. 3. Low RH values 15 to 25 percent will stretch across much of the San Joaquin Valley and Sierra Nevada with values 5 to 10 percent in the Mojave Desert. RH will decrease over the region later in the week with warming temperatures. && .DISCUSSION... An upper level are of low pressure has made it to the central California coast where it is expected to remain mostly stationary through late Tuesday. Meanwhile, an area of high pressure continues to strengthen over the Four Corners region. The two synoptic-scale areas are anticipated to cause overall flow across central California to track out of the southwest, resulting in near average temperatures, but increased winds in the lee of the West Side Hills and Tehachapi Mountains and in typical wind-prone areas. These winds will combine with seasonably low RH values around 20 percent to result in conditions favorable for elevated fire danger, especially in places such as west of Lost Hills and at Lake Isabella. The aforementioned low is expected to lift into northern California on Wednesday, allowing the ridge of high pressure to slide westward over central and southern California. The increasing pressure will cause temperatures to warm across the region, with a moderate to high probability (40 to 70 percent) to reach over 100 degrees on Thursday and a high probability (75 to 95 percent) for Friday. The rising temperatures will cause a decrease in relative humidity, with much of the San Joaquin Valley and Sierra Nevada having between 10 and 20 percent RH values; Kern Desert values are expected to remain in single digits through the forecast period. However, the subsiding air aloft later in the week will cause a decrease in winds in the valley areas, and mainly diurnal and terrain driven winds in the foothill, mountain, and desert areas. && .AVIATION... 18Z Update: VFR conditions will prevail for the next 24 hours across the Central California Interior. && .AIR QUALITY ISSUES... ISSUED: 07/06/2025 14:42 EXPIRES: 07/07/2025 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