FXUS65 KVEF 092156 AFDVEF Area Forecast Discussion National Weather Service Las Vegas NV 255 PM PDT Fri May 9 2025 .SYNOPSIS...Temperatures will continue to climb, peaking tomorrow. An incoming system will bring gusty winds and cooler temperatures to the early starting Sunday through the first half of next week. && .DISCUSSION...through next Friday. Afternoon temperatures will top out around 3 to 6 degrees warmer than they did yesterday. This warming trend, along with light winds and mostly sunny skies will continue through tomorrow as a ridge of high pressure builds over the southwestern US. These temperatures will bring Moderate HeatRisk (Level 2 of 4) to the valleys and lower elevations of southern Nevada, northwest Arizona, and southeastern California today and tomorrow. Death Valley and the lower elevations of the Colorado River Valley will see HeatRisk increase to Major (Level 3 of 4) on Saturday. People planning on recreating outdoors over the weekend should take proper precautions to ensure they are adequately hydrated and protected from the sun to help minimize any adverse heat impacts. A upper-level trough will approach the Pacific Northwest on Sunday, resulting in an increase in southerly to southwesterly winds across the the region. These winds will make for choppy waters on area lakes with 1 to 2 foot waves expected on Lake Mead and Lake Mohave. As this trough pushes into the Pacific Northwest we will see 500 mb heights fall slightly on Sunday. However, increased winds aloft will help us to mix, keeping temperatures from falling too quickly from Saturday into Sunday. Winds will increase further with widespread 40+ mph wind gusts expected on Monday as this trough begins to dig into the Desert Southwest. These gustier winds will linger across the Mojave Desert through southern Nevada and into northwest Arizona on Tuesday as the trough axis swings through. As you would expect, we will see temperatures drop off quickly as this system swings through. Temperatures will drop 5 to 10 degrees from Sunday into Monday, cooling an additional 10 to 15 degrees from Monday into Tuesday. This system will be much drier than the system that impacted the region last weekend, with chances for isolated showers being confined to the mountains of Inyo County and the southern Great Basin on Tuesday. Beyond Tuesday, the upper-level pattern will remain trough-y with temperatures gradually warming back up during the second half of the week. && .AVIATION...For Harry Reid...For the 00Z Forecast Package...Mainly light winds favoring a northeast direction through the remainder of the afternoon with light southwest winds overnight. Wind speeds will remain under 8KT through the period. Dry conditions will persist with only a few afternoon clouds around 12kft expected today and around 14kft Saturday. Breezy southeast winds will develop early Saturday afternoon with gusts to 20 kts likely. Winds are expected to become more southerly after 22Z with occasional gusts between 20-25 kts. For the rest of southern Nevada, northwest Arizona and southeast California...For the 00Z Forecast Package...KBIH will see breezy southeast to south winds into this evening before decreasing and becoming northwest around 7kts overnight. Southeast winds will redevelop Saturday and become gusty after 18z with gusts to around 22kts. KDAG will see winds become westerly overnight with speeds around 8kts and then become east after 18z Saturday with speeds around 10kts. Elsewhere, southeast to south winds will develop in the afternoon with most areas seeing gusts between 20-25kts. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && $$ DISCUSSION...Stessman AVIATION...Gorelow For more forecast information...see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter