Extreme Heat Warning
Extreme Heat Warning
URGENT - WEATHER MESSAGE
National Weather Service Tucson AZ
101 PM MST Wed Mar 18 2026
AZZ503-507>509-191215-
/O.CON.KTWC.XH.W.0001.260319T1800Z-260323T0300Z/
Upper Santa Cruz River Valley/Altar Valley-Upper San Pedro River
Valley-Eastern Cochise County below 5000 feet-Upper Gila River
Valley-
Including the cities of Clifton, Sierra Vista, Nogales, Benson,
Safford, Douglas, and Willcox
101 PM MST Wed Mar 18 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 11 AM THURSDAY TO 8 PM
MST SUNDAY...
* WHAT...Dangerously hot conditions with high temperatures of 95 to
100 degrees expected. The hottest days are currently expected to be
Friday March 20 and Saturday March 21.
* WHERE...Eastern Cochise County below 5000 feet, Upper Gila River
Valley, Upper San Pedro River Valley, and Upper Santa Cruz River
Valley/Altar Valley.
* WHEN...From 11 AM Thursday to 8 PM MST Sunday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
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.
Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when possible and
drink plenty of water.
