989 FXUS65 KVEF 261154 AFDVEF Area Forecast Discussion National Weather Service Las Vegas NV 454 AM PDT Sat Jul 26 2025 .KEY MESSAGES... * Temperatures will remain below normal throughout the weekend before a slow warm-up begins early next week. * Moisture levels will remain low through the weekend, keeping most of the area dry. A slight uptick in monsoonal moisture across Arizona next week will bring some precipitation chances to eastern Mohave County by mid-week. && .DISCUSSION...through Thursday. A long wave trough over the eastern Pacific will remain in place through the weekend helping to keep temperatures a few degrees below normal. A weak closed low just off the central California coast will open and become absorbed into the main long wave trough. Due to the increased surface gradient of this weak low, we will see another day of breezy afternoon south to southwest winds. By Sunday, winds will weaken as the pressure gradient relaxes. There will still be some mid level moisture over the southern Sierra which will lead to one more day of isolated afternoon thunderstorms, generally north of Mount Whitney, but by Sunday any convection should remain north of Inyo County. AS we go into next week, a strong ridge of high pressure over the central portions of the US will begin to shift west. This will increase heights and bring temperatures back to near normal to slightly above normal starting Monday. Although we will begin the warm up, the good news is that the HeatRisk will generally remain at 1 (Minor) to 2 (Moderate) through much of the week. Later in the week as the strong high pressure over the central plains will spreads west, we will see an increase in monsoonal flow across Arizona. How far west the moisture will get is still in question as it will be fighting the southwest flow that is associated with the long wave trough off the coast. At this point, the models are indicating PWATs increasing to around .70" to .80" across far southern and eastern Mohave County by Tuesday, leading to increased chances of thunderstorms in these areas. Only time will tell if this deeper moisture is able to make is west of the Colorado River, but with the latest model runs, that looks unlikely. && .AVIATION...For Harry Reid...For the 12Z Forecast Package...Light winds this morning will gradually settle out of the south- southwest this afternoon. Another round of gusty winds is expected, with sustained speeds increasing to 10-15KT and intermittent gusts to around 20KT this afternoon through sunset. Thermally-induced gusts will result in some variability in wind direction between southwest and southeast during peak heating, before winds become light overnight through the end of the period. VFR conditions prevail, with increasing high clouds through the afternoon and temperatures topping out near 100 degrees around 00Z. For the rest of southern Nevada, northwest Arizona and southeast California...For the 12Z Forecast Package...Light winds this morning will shift to the south and southwest across most of the region by this afternoon, with gusts to 20-25KT. Exceptions are across the Western Mojave where winds will generally remain westerly, and through the Owens Valley including KBIH where winds are expected to gust out of the southeast late afternoon through late evening. Areawide, gusts will diminish and winds become lighter overnight, with passing high clouds and VFR conditions prevailing. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && $$ DISCUSSION...Gorelow AVIATION...Phillipson For more forecast information...see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter