On Wednesday, June 15, 2016 at 3:00:48 PM UTC+1, Dawlish wrote:
Keep your eye on the news. Record-breaking temperatures are quite possible:

http://mashable.com/2016/06/14/south.../#jMEfa8xniSq3

Record temperatures very possible this weekend/early next week. National Weather service has an excessive heat warning out:

"The Excessive Heat Warning remains in effect from 10 AM PDT /10 AM mst/ Sunday to 9 PM PDT /9 PM mst/ Wednesday.

Temperatu Excessive Heat will begin to be noticeable across the Mojave Desert region Sunday but the hottest days will likely be Monday and Tuesday with record high temperatures possible for many sites. The following temperature ranges are expected during the 4 day period, 108 to 115 in the Las Vegas Valley, Boulder City and Pahrump, 110 to 115 for much of San Bernardino, Southern Mohave and Northeast Clark counties, 115 to 120 along the Colorado River from Laughlin and Bullhead City down to Lake Havasu, and 117 to 125 in Death Valley.

Impacts: An Excessive Heat Warning means that a prolonged period of dangerously hot temperatures will occur. Heat related illnesses such as heat exhaustion and heat stroke will be likely. People Most Vulnerable include those who are spending lots of time outdoors, those who do not have air conditioning, young children, the elderly, and those with chronic ailments."

This appears to have been a good 'heads up' from several sources. Outcome temperatures will determine the accuracy of these warnings, but it's an interesting situation for meteorologists and weather watchers.