


Area Forecast Discussion
Issued by NWS Las Vegas, NV
Issued by NWS Las Vegas, NV
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100 FXUS65 KVEF 151706 AFDVEF Area Forecast Discussion National Weather Service Las Vegas NV 1006 AM PDT Tue Jul 15 2025 .KEY MESSAGES... * Temperatures will decrease through the remainder of the week, before slowly increasing over the weekend. * An increase in monsoonal moisture later in the week will result in increased chances for afternoon showers and thunderstorms. * Gusty southerly winds today will result in areas of critical fire weather concerns across portions of southern Nevada. && .DISCUSSION...Today through Monday. Temperatures will average 1-3 degrees cooler today compared to Monday, and this downward trend will continue through the end of the week. By Friday, high temperatures will dip to below normal levels with afternoon highs topping out around 100F in Las Vegas (there is a 40% chance of the high on Friday remaining less than 100F). Temperatures will slowly rebound over the weekend and return to near normal levels by early next week. Hazy skies will continue over much of the region as smoke from area wildfires continues to be transported into the area. The highest concentrations of smoke are expected in the Colorado River Valley and Mohave County today and tomorrow, but this will be highly dependent on the intensity of the fire activity in the coming days. Moisture spreading up from southern Arizona will result in a few isolated showers and thunderstorms today and tomorrow across far eastern portions of Mohave County. By late tomorrow, a cut-off area of low pressure is forecast to develop off Baja California, which will help to spread increased moisture levels into portions of the region for the second half of the week. The best chance of precipitation in the Las Vegas valley appears to be on Friday, although a few isolated storms will be possible over the higher terrain in southern Nevada by Thursday afternoon. Beyond Friday, there is still quite a bit of uncertainty regarding how much and how long the moisture will remain in place. Still, the threat of a few storms will likely persist through the weekend, especially over northwest Arizona. && .FIRE WEATHER...A short wave moving through the Great Basin today will result in gusty southwest winds across portions of the southern Great Basin. A dry airmass will also remain in place, and afternoon relative humidity values of 7 to 14 percent will be common. The combination of these two factors will result in critical fire weather conditions across Nevada Fire Weather Zones 461 and 462, and a Red Flag Warning remains in effect for these areas through this evening. Breezy south winds are also expected along the lower Colorado River Valley this afternoon, leading to some elevated fire weather concerns. However, wind speeds are expected to remain below Red Flag Criteria, and RH values in the valley will be a bit higher in the afternoon, with values of 12 to 25 percent expected. Fire Weather concerns will decrease later in the week as increased moisture levels spread over the area and afternoon RH values increase to greater than 25 percent by Friday. && .AVIATION...For Harry Reid...For the 18Z Forecast Package...Breezy south winds persist throughout the TAF period. Best chances of SSE component during the morning hours, with a more SSW component expected during the afternoons and evenings. Gusts largely 20-25 knots, though a few gusts around 30 knots are possible. A few mid- level clouds around during peak heating, but otherwise just some lingering wildfire haze. Temperatures to exceed 100F between 18z and 05z, with a peak around 109F. For the rest of southern Nevada, northwestern Arizona and southeastern California...For the 18z Forecast Package...Gusty southerly to westerly winds across the region today with gusts largely 20-30 knots. Winds weaken after sunset but remain elevated through the night. A few mid-level clouds around during peak heating, but otherwise just some lingering wildfire haze. Thunderstorm activity should remain east of Mohave County this afternoon. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && $$ DISCUSSION...Planz AVIATION...Woods FIRE WEATHER...Planz For more forecast information...see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter