171 FXUS66 KHNX 270527 AAB AFDHNX Area Forecast Discussion...UPDATED National Weather Service Hanford CA 1027 PM PDT Sat Apr 26 2025 .UPDATE...Updated Aviation Section. && .KEY MESSAGES... 1. Windy conditions are expected across the Mojave Desert until early Sunday morning with a High Wind Warning for the Mojave Slopes. 2. Temperatures will be much cooler than climatological average this weekend then trending warmer next week. && .DISCUSSION...Satellite loops show the upper-level low along the coast near Pt Conception. At this time, this feature is bringing showers to our southern areas, including in the valley and West Side hills, as well as Southern CA. These showers are spreading northward and are approaching Fresno. This is a cold system for this time of year, with snow levels expected around 5,000 feet. It will also produce unstable conditions, sufficient for a slight chance of isolated thunderstorms for this afternoon and evening. In addition, gusty winds will develop this afternoon and continue until late tonight/early Sat AM. Showers will continue overnight into Sunday morning, though mainly over the higher terrain. Amounts will generally be light over most of the region, based on latest best/worst case scenario amounts (or anywhere from a few hundredths of an inch to just above 0.25 inch in the SJ Valley). Also, amounts in the Sierra Nevada will range from 0.50 inch to over 1.00 inch in the highest elevations, with several inches of snow up to a foot; however, in the worst case scenario, amounts could exceed 1.50 inches (about a 10 percent chance). By Sunday morning, some low clouds will linger above the Central Valley, though the favored areas are towards the southern and eastern sides due to northwest flow aloft. Cooler than normal temperatures will last through at least Sunday, before a ridge of high pressure moves in and builds. Expect temperatures closer to seasonal averages on Monday and back to above normal by Tuesday. Well above average temperatures are in store for Wednesday until Friday before temperatures lower back towards normal by next weekend. Another trough of low pressure will bring a chance for some precipitation to mainly the mountains next Saturday, although it doesn`t appear quite as cold as the current one. More to follow, as we get closer. Current 6-10 day and 8-14 day outlooks from the Climate Prediction Center, overall favor above normal temperatures but near to above average precipitation. However, it appears periods with cooler or seasonal temperatures combined with precipitation will be relatively brief, as both of these periods cover the early part of May. && .AVIATION...06Z Update: In the San Joaquin Valley and West Side Hills, VFR prevailing with local MVFR in low clouds thru 06Z Mon. Across the Sierra Nevada, adjacent foothills and Tehachapi Mountains, widespread mountain obscuring IFR in low clouds thru 06Z Mon. Across the Kern County portion of the Mojave Desert, expect wind gusts 40-50 kts through 18Z Sunday. Otherwise VFR thru 06Z Mon. && .AIR QUALITY ISSUES...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... Wind Advisory until 11 AM PDT Sunday for CAZ337-339. High Wind Warning until 5 AM PDT Sunday for CAZ338. Winter Weather Advisory until 11 AM PDT Sunday for CAZ323- 325>331-333>336. && $$ public...BSO aviation...DAS weather.gov/hanford