911 FXUS65 KVEF 131202 AFDVEF Area Forecast Discussion National Weather Service Las Vegas NV 502 AM PDT Fri Jun 13 2025 .SYNOPSIS...Temperatures will gradually increase through the remainder of the work week into the weekend, peaking on Sunday. An Extreme Heat Warning is in effect for lower elevations of southeastern California, southern Nevada, and northwestern Arizona. Meanwhile, expect breezy-to-gusty southwesterly winds each afternoon through the forecast period. && .DISCUSSION...Today through Thursday. A building area of high pressure over the southeastern Pacific Ocean will increase heights across the Desert Southwest, resulting in increasing temperatures each day through the remainder of the work week into the weekend. Temperatures will peak on Sunday at 8 to 12 degrees above seasonal normals, with a forecast temperature of 108 for Las Vegas. "Major" HeatRisk is spreading across desert valley locations of our forecast area. The NBM deterministic high temperatures are around the 25th percentile, with the bulk of the ensemble indicating that temperatures will be a degree or two hotter, which would further increase the spatial coverage of Major HeatRisk. Given that Sunday is Father`s Day, so people are more likely to spend time outside this weekend, went ahead and issued an Extreme Heat Warning for valley locations of southeastern California, southern Nevada, and northwestern Arizona on Sunday. This includes Death Valley National Park, western San Bernardino County, far southern Nye County, lower elevations of Clark County including Las Vegas, southern Mohave County, and the Colorado River Valley including the Lake Mead National Recreation Area. If planning to spend time outdoors this weekend, avoid the hottest parts of the day, bring plenty of water, and wear sunscreen. Meanwhile, a dry southwesterly flow aloft continues, as a closed area of low pressure meanders slowly southward out of the Gulf of Alaska and a growing ridge of high pressure builds across the southwestern United States. As such, expect breezy southwest winds each afternoon through the remainder of the week and into the weekend. This will result in increased fire concerns across the forecast area, so be aware of this if recreating outside with sparks or flames. Early next week, a shortwave will move through the flow aloft, which will increase gusty winds on Monday. Greatest chances for speeds over 40 mph exist in western San Bernardino (30-50%), with most locations remaining sub-advisory. This shortwave will drop temperatures 4 to 6 degrees through Tuesday before the ridge sets back up and increases temperatures through the remainder of the work week. && .AVIATION...For Harry Reid...For the 12Z Forecast Package...Similar to previous days, gusty south-southwesterly winds remain the primary aviation concern. Gusts to 20-25KT will be intermittent this morning, becoming more prevalent this afternoon as winds veer southwesterly. Gusty winds then persist overnight, backing to the south. Otherwise, VFR conditions will prevail with high clouds that are not expected to impact operations. Temperatures are expected to reach or exceed 100 degrees between 21Z-03Z, peaking at 103 degrees around 00Z. For the rest of southern Nevada, northwest Arizona and southeast California...For the 12Z Forecast Package...Gusty southwesterly winds are the primary aviation concern across the region, with widespread gusts to 20-25KT expected late this morning through this evening. The exception will be across the Western Mojave Desert, including KDAG, where winds this morning will gust to 30-35KT, diminishing briefly, with gusts to 25-30KT returning this afternoon onward. VFR conditions will prevail, with passing high clouds with bases around 25kft. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && $$ DISCUSSION...Soulat AVIATION...Phillipson For more forecast information...see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter