Western Heat Wave – Las Vegas ties highest everJune 29th, 2013 at 4:21 pm by Bill Steffen under Bill's Blog, Weather
Click the graphic to enlarge - 4 pm EDT/1 PM Pacific Time – Temperatures: 108 LAS, 107 PHX, 110 Yuma. The low temperature at Stovepipe Wells/Death Valley Monday AM was 101. Las Vegas tied their highest temperature ever Sunday PM at 117. That temperature was also reached on 7/19/2005 and 7/24/1942. This also sets an all-time record high for June. 7 PM EDT Sunday – At 4 PM local time, it was 116 in Las Vegas (variable at 3 mph), 114 in Phoenix, 122 in Needles CA (humidity 6%) – much cooler at the ocean, 74 in San Diego and 63 in Crescent City CA in NW California. The Saturday night low temperature at Salt Lake City was 80. That will likely be the warmest low temperature ever at SLC. Needles CA had a low of 95 Saturday night. At 10 AM they were already a lot of temperatures over 100 in the desert areas. The high temperature Saturday at Death Valley was 128 depending on which NWS site you care to believe). Check out this article on the weather station at Death Valley and this article on the difference in the 2 weather stations at Mercury NV. The thermometer reached 115 in Las Vegas (humidity 6% and wind 6 mph). It was the warmest temperature in Las Vegas since 1994. Phoenix AZ hit119 (humidity 6%), the low temperature in Phoenix Sat. and Sun. morning was 91. Palm Springs CA hit 122 (humidity 5%). Needles CA climbed to 123 (low of 93 Fri. night)(highest ever in June). Bullhead City AZ has reached 123 and Blythe CA has made 119. The all-time hottest temperature for Las Vegas is 117 – reached in 1942 and 2005. Las Vegas has seen phenomenal population growth (urbanization). The weather station at the McCarren Airport is now surrounded by a lot of asphalt and concrete that wasn’t there in 1942. Between the evaporation of water from the city (fountains, etc.) raising the dew point and urbanization, it’s nearly impossible for Las Vegas to set a record low temperature now. Also: All-time record high June temperatures at Houston (107) and San Antonio TX (108). Check out the 500 mb map. This is a map of a constant pressure surface. The higher heights (note the high pressure ridge over the Western U.S.) show the core of the heat. Note the lower heights in the Great Lakes, where we have more clouds, showers and cooler than average high temperatures. This link updates the days high temperatures usually shortly before midnight. (graphic from nbcbayarea.com and the NWS in Las Vegas). This heat wave should last a good 5-6 days. There will be a few scattered thundershowers in the SW U.S. over the next several days. This often happens when it gets real hot. You get warm air running up the mountains and forming scattered t-showers. It looks like Death Valley made 128 – six degres shy of their all-time record. Check out this article on the weather station at Death Valley. The Average HIGH/LOW at Death Valley for June 30 is 114/85 (mean of 100). At the end of December, the average HIGH/LOW is 65/37.