379 FXUS66 KHNX 140510 AFDHNX Area Forecast Discussion National Weather Service Hanford CA 1010 PM PDT Sun Apr 13 2025 .UPDATE... Aviation Section Updated && && .KEY MESSAGES... 1. Unseasonably warm temperatures will continue through this week with highs approaching 15 degrees above average on Monday. 2. There is a slight chance for showers and thunderstorms across the Sierra Nevada each afternoon Tuesday through Friday. && .DISCUSSION... The region is currently under the out edge of a trough centered over Montana, resulting in a slight cool off from yesterday. This will be short lived as a ridge pushes in from the Pacific and creates an area of lower pressure underneath the axis of said ridge. This will lead to increased temperatures in Central California tomorrow, with highs reaching to around 15 degrees above normal. After tomorrow begins a series of troughs dipping into the southwest, the first coming in on Tuesday and the second on Friday. During that time, just enough moisture may be pulled in from the ocean that showers and thunderstorms can develop in the Sierra Nevada each afternoon from Tuesday through Friday. The weaker of these two is first trough, as it is much wider than the second, which is looking to be narrower. A narrow trough concentrated energy while a wide trough spreads energy out. This may lead to more wide spread thunderstorms on Friday due to this feature. These troughs will also have the added effect of cooling the region back into the 70`s on Wednesday as the first trough passes through and until Saturday when the trough moves away. Sunday will see the return of 80+ degree highs in the Valley. && .AVIATION... 6Z Update VFR Conditions will prevail over the central California interior for the next 24 hours. && .AIR QUALITY ISSUES... ISSUED: 04/13/2025 14:17 EXPIRES: 04/14/2025 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......EW aviation....JPK dss/pio.....FC weather.gov/hanford