[:ph on :ra 207]
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...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM THIS
MORNING TO 7 PM MST THIS EVENING BELOW 4000 FEET...

 WHAT...Dangerously hot conditions with temperatures of 105 to
 110 degrees are expected below 4000 feet.
 WHERE...The Grand Canyon...especially near Phantom Ranch.

 WHEN...From 11 AM to 7 PM MST Friday.

 IMPACTS...Extreme heat will significantly increase the potential
 for heat related illnesses, particularly for those working or
 participating in outdoor activities.

This warning is reserved for very hot conditions 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. Between 11 am and 7 pm...physical activity is
discouraged. Hikers should attempt to be out of the canyon...at
Indian Garden or Bright Angel campgrounds between these hours. 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.