Extreme Heat Warning for Grand Canyon Country
Official alert fields
What you need to know
- Applies to
- Grand Canyon Country
- Effective
- Ends or expires
- Official severity
- Severe
- Official urgency
- Expected
- Official certainty
- Likely
What is happening
What: Dangerously hot conditions expected below 4000 feet, with daytime temperatures ranging from 94 to 99 degrees at Havasupai Gardens, and 107 to 111 degrees at Phantom Ranch. Impacts: Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with...
What the bulletin says to do
This warning is reserved for only the hottest days of the year and is issued when temperatures are expected to rise to dangerous levels. Day hikers on Bright Angel Trail should descend no farther than 1 1/2 miles from the upper trailhead. Between the hours of 10 AM and 4 PM, hikers should be out of the canyon or at Havasupai Gardens or Bright Angel campgrounds, physical activity is discouraged. All hikers should have adequate gear, including a wide-brimmed hat, sunscreen, salty snacks, sufficient water, and electrolyte mix. Doubling your calorie intake helps maintain your energy. Hike smart.
Full official description
Bulletin details
* WHAT...Dangerously hot conditions expected below 4000 feet, with daytime temperatures ranging from 94 to 99 degrees at Havasupai Gardens, and 107 to 111 degrees at Phantom Ranch. * WHERE...Lower elevations of the Grand Canyon. * WHEN...From 10 AM Tuesday to 8 PM MST Thursday. * IMPACTS...Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure.
Official geometry where available
Alert boundary
Lifecycle record
Official revisions
- Alert
Extreme Heat Warning issued August 17 at 9:28PM MST until August 20 at 8:00PM MST by NWS Flagstaff AZ
Official revision
Source and limitations
Publisher: Weather Alert Watch. Primary source: NWS Flagstaff AZ. This page reorganizes official fields and does not add a forecast or expand the affected area.
- CAP status
- Actual
- Message type
- Alert
- Last collected