I have WeatherBug installed on my computer. Every once in a while there will be an alert. When it went off just now I thought they were going to display that a storm was coming through. Instead I got what you see below. I already KNEW that! 
It is August in Las Vegas after all. 
Andy - Las Vegas
EXCESSIVE HEAT WARNING FROM NOON
UNTIL 8 PM PDT/MST TODAY AND WEDNESDAY
Urgent - Weather Message National Weather Service Las Vegas NV 1014 AM PDT Tue Aug 10 2004
2300 - Death Valley National Park - Lake Havasu And Fort Mojave - Lake Mead National Recreation Area - Las Vegas Valley - Northeast Clark County - Northwest Deserts - San Bernardino County Deserts - San Bernardino County - Upper Colorado River Valley - Southern Clark County - Western Clark And Southern Nye County - 1014 AM PDT (1014 AM Mst) Tue Aug 10 2004
... Excessive Heat Warning From Noon Until 8 PM Pdt/Mst Today And Wednesday...
A Strong Area Of High Pressure Over The Area Will Contribute To High Temperatures Peaking Out Above Normal Today And Wednesday. Temperatures Will Be Around 111 Degrees In The Las Vegas Valley... 115 Degrees Along The Colorado River Valley And 123 Degrees At Death Valley.
It Appears There Will Be 3 Or 4 Successive Days With Temperatures Above Normal. Children... The Elderly... And People With Chronic Ailments Are Usually The First To Suffer From The Heat. Heat Exhaustion... Heat Cramps... Or In Extreme Cases... Heat Stroke May Result From Prolonged Exposure To These Conditions. Friends... Relatives... Or Neighbors Should Check On People At Risk.
Effects Can Be Minimized By Reducing Outdoor Activities... Drinking Plenty Of Water Or Non - Alcoholic Beverages... And Wearing Light - Colored Clothing.
Stay Tuned To Noaa Weather Radio... Commercial Radio Or Television Stations... Or Your Cable Television Provider For The Latest Information Concerning This Excessive Heat Event.
