NWS Las Vegas NVXH.W 0004August 17, 2026
Extreme Heat Warning: Lake Havasu and Fort Mohave, Lake Mead - AZ side, Lake Mohave - AZ side and 13 more, AZ and CA
The National Weather Service office in Las Vegas issued an extreme heat warning for Lake Havasu and Fort Mohave, Lake Mead - AZ side, Lake Mohave - AZ side and 13 more in Arizona, California, Nevada, which was in force until 8:00 p.m. local time on August 21. It was the 4th extreme heat warning the NWS office in Las Vegas issued in 2026. Arizona had 7 extreme heat warnings in August 2026, against 6 in an average August of 2008-2025 (Arizona's extreme heat warnings by year).
ExpiredWarning
In force for 3 days; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Las Vegas NV
- Area
- Lake Havasu and Fort Mohave, Lake Mead - AZ side, Lake Mohave - AZ side and 13 more
- State
- Arizona
- Level
- Warning
- Issued
- 2:14 a.m. PDT, August 17, 2026
- In force from
- 10:00 a.m. PDT, August 18, 2026
- Expires
- 8:00 p.m. PDT, August 21, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Expected
- VTEC event
- KVEF XH.W 0004
- Official source
- National Weather Service: the notice at its source
Source: National Weather Service: the notice at its source. AreaZine rebuilds this page from the agency's record; the agency's page is the one to act on. A U.S. Government work, in the public domain.
The notice as issued
* WHAT...Dangerously hot conditions with temperatures up to 115 to 118 degrees expected through Death Valley and the lower Colorado River Valley, with highs between 107 to 110 degrees elsewhere. * WHERE...Portions of northwest Arizona, southeast California, and southern Nevada. * WHEN...From 10 AM PDT / MST Tuesday to 8 PM PDT / MST Friday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events.
What the agency told people to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose-fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. Monitor the latest forecasts and warnings for updates.
Source: National Weather Service: the notice at its source. The text is the agency's, unedited. A U.S. Government work, in the public domain.