454
WWUS75 KTWC 200907
NPWTWC

URGENT - WEATHER MESSAGE
National Weather Service Tucson AZ
207 AM MST Wed Aug 20 2025

AZZ501>507-509-202300-
/O.CON.KTWC.XH.W.0006.250820T1700Z-250823T0300Z/
Western Pima County-Tohono O`odham Nation-Upper Santa Cruz River
Valley/Altar Valley-Tucson Metro Area-South Central Pinal County-
Southeast Pinal County-Upper San Pedro River Valley-Upper Gila
River Valley-
Including the cities of Sierra Vista, Nogales, Green Valley,
Clifton, Vail, Safford, Sells, Tucson, Mammoth, Picacho Peak
State Park, Ajo, Benson, Organ Pipe Cactus N.M., Marana, and
Oracle
207 AM MST Wed Aug 20 2025

...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO
8 PM MST FRIDAY...

* WHAT...Dangerously hot conditions with temperatures ranging from
  105 to 110 across much of Pima and southeastern Pinal counties
  leading to Major Heat Risk. In other areas of southeastern
  Arizona, high temperatures will range from 100 to 105 degrees.

* WHERE...South Central Pinal County, Southeast Pinal County, Tohono
  O`odham Nation, Tucson Metro Area, Upper Gila River Valley, Upper
  San Pedro River Valley, Upper Santa Cruz River Valley/Altar
  Valley, and Western Pima County.

* WHEN...From 10 AM this morning to 8 PM MST Friday.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat events.

* ADDITIONAL DETAILS...Major Heat Risk is when heat will affect
  anyone without cooling or hydration as well as health systems and
  industries.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

$$

KJS