365 FXUS65 KVEF 151747 AFDVEF Area Forecast Discussion National Weather Service Las Vegas NV 1046 AM PDT Sun Jun 15 2025 .KEY MESSAGES... * Above-normal temperatures continue through the forecast period, with afternoon temperatures peaking today. An Extreme Heat Warning in effect from 10 AM to 10 PM today. * Breezy southwesterly winds will continue each afternoon, peaking on Monday, resulting in increased fire danger. A Fire Weather Watch is in effect from 12 PM to 8 PM Monday. * Breezy winds peak once again late-week as temperatures decrease heading into the weekend. && .DISCUSSION...Today through Saturday. High pressure centered over northern Mexico will continue to build across the Desert Southwest, resulting in temperatures 8 to 12 degrees above seasonal normals. An Extreme Heat Warning is in effect today from 10 AM to 10 PM for western San Bernardino County, Death Valley National Park, lower elevations of Clark County, far southern Nye County, southern Mohave County, and the Colorado River Valley (including the Lake Mead National Recreation Area). Those spending time outdoors today are encouraged to stick to the cooler parts of the day, bring extra water & electrolytes, and avoid heavy meals before heading outdoors. "Major" HeatRisk (Level 3 on a scale from 0 to 4) will expand across the desert valleys today, with widespread "Moderate" HeatRisk elsewhere. Expect above-normal temperatures to continue through the remainder of the forecast period. The region will remain sandwiched between an area of low pressure in the Gulf of Alaska and the aforementioned area of high pressure over northern Mexico. As a result of this dry southwesterly flow aloft, expect breezy southwesterly winds each afternoon through the week. To exacerbate wind speeds, a shortwave will push into the Desert Southwest on Monday, which will increase southwesterly winds to 30 to 35 mph across the western Mojave Desert, Owens Valley, and higher terrain across the forecast area (20-30 mph elsewhere). There is a 30-50% chance of an isolated gust to 40 mph, but these will be isolated in space and time, so opted out of a Wind Advisory. These winds coupled with bone dry conditions will elevate wildfire concerns, so a Fire Weather Watch has been hoisted from 12 PM to 8 PM on Monday, as a result. Find the FIRE WEATHER discussion below. Late-week, ensembles indicate that the Gulf of Alaska closed low will quickly push southward into the Great Basin. As the Desert Southwest remains sandwiched between this system and the northern Mexico high, pressure gradients will tighten substantially, resulting in strong, gusty winds Thursday and Friday. Through the weekend, the low`s associated trough will push through our forecast area, allowing heights to fall and temperatures to drop closer to seasonal normals. && .FIRE WEATHER...A Fire Weather Watch is in effect from 12 PM to 8 PM on Monday across southern Nevada (Zones 462, 464, 465, 466) and northwestern Arizona (Zones 101, 102). A shortwave trough will push into the region, resulting in gusty southwest winds. Speeds will generally range from 25 to 35 mph, with occasional gusts to 40 mph in the western Mojave Desert, Owens Valley, and the higher terrain of the forecast area. The Storm Prediction Center`s Day 2 Fire Weather Outlook has highlighted Clark County, northern Mohave County, and Washington County as "Critical". Increased risk of wildfire starts and spreads is a result of these breezy southwest winds coupled with single-digit minimum relative humidities and poor overnight recoveries (5-15%). Subsequent days have lighter wind speeds and marginally improved overnight RHs. Be sure to safely dispose of cigarette butts, avoid activities with sparks or flames (camp fires, target practice, fireworks), and report any fire starts to local officials. && .AVIATION...For Harry Reid...For the 18Z Forecast Package...Gusty southerly to southwesterly winds will continue to be the concern through the forecast period. Gusts of 20 to 25 knots are likely through the afternoon and into the evening, before diminishing by 06Z. Winds will remain elevated overnight with sustained speeds of 10 to 12 knots expected. Gustiness will return after 16Z tomorrow with similar gusts to today, likely after 18Z. VFR conditions will prevail through the TAF period with only a FEW clouds with bases AOA 20kft AGL through the afternoon, then mainly clear skies thereafter. Temperatures over 100F can be expected through 04Z, peaking around 108F around 00Z. Tomorrow, temperatures in excess of 100F are likely between 16Z and 04Z. For the rest of southern Nevada, northwest Arizona and southeast California...For the 18Z Forecast Package...All areas, except for the lower Colorado River Valley, will see gusty winds out of the south to southeast through the afternoon and into the evening. Winds in the river valley will be lighter, with winds generally remaining 12 knots or less. Overnight, winds are expected to diminish, but similar conditions are likely on Monday, with gusts in the 20 to 30 knot range anticipated at all regional TAF sites. VFR conditions will prevail through tomorrow with only a FEW clouds with bases AOA 15kft AGL expected, mainly over the northern half of the region. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && $$ DISCUSSION...Soulat AVIATION...Planz For more forecast information...see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter