578
WWUS75 KFGZ 180806
NPWFGZ

URGENT - WEATHER MESSAGE
National Weather Service Flagstaff AZ
106 AM MST Mon Aug 18 2025

AZZ006-181615-
/O.NEW.KFGZ.XH.W.0005.250819T1700Z-250821T0300Z/
/O.NEW.KFGZ.XH.A.0003.250821T0300Z-250823T0300Z/
Grand Canyon Country-
Including the cities of Supai, North Rim, and Grand Canyon
Village
106 AM MST Mon Aug 18 2025

...EXTREME HEAT WARNING IN EFFECT FROM 10 AM TUESDAY TO 8 PM MST
WEDNESDAY BELOW 4000 FEET...
...EXTREME HEAT WATCH IN EFFECT FROM WEDNESDAY EVENING THROUGH
FRIDAY EVENING BELOW 4000 FEET...

* WHAT...Dangerously hot conditions expected below 4000 feet, with
  daytime temperatures ranging from 102 degrees at Havasupai
  Gardens, to 112 degrees at Phantom Ranch.

* WHERE...Lower elevations of the Grand Canyon.

* WHEN...For the Extreme Heat Warning, from 10 AM Tuesday to 8 PM
  MST Wednesday. For the Extreme Heat Watch, from Wednesday evening
  through Friday evening.

* IMPACTS...Most individuals will be at risk for heat-related
  illnesses without effective cooling or adequate hydration,
  especially with prolonged outdoor exposure.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

Take action when you see symptoms of heat exhaustion and heat
stroke. Anyone overcome by heat should be moved to a cool and shaded
location. Heat stroke is an emergency! Call 9 1 1.

Stay cool, stay hydrated, stay informed.

&&

$$

Humphreys