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An excessive heat watch is a notice issued by the National Weather Service of the United States when the high temperatures reach anywhere within the range of 95 °F (35 °C) and 100 °F (38 °C) in the continental US. Exposure to those temperatures could become very deadly to humanity, as when people are exposed to those temperatures, they are at high risk of getting heat stroke and heat exhaustion.

Example

The following is an example of an excessive heat watch issued by the National Weather Service office in Pendleton, Oregon.

661 
WWUS76 KPDT 021949
NPWPDT
URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
1249 PM PDT Tue Jul 2 2024
ORZ041-044-505-507-508-510-511-WAZ024-026>029-521-032200-
/O.NEW.KPDT.EH.A.0001.240705T1900Z-240710T0500Z/
Eastern Columbia River Gorge of Oregon-Lower Columbia Basin of
Oregon-John Day Basin-Foothills of the Northern Blue Mountains of
Oregon-Foothills of the Southern Blue Mountains of Oregon-North
Central Oregon-Central Oregon-Eastern Columbia River Gorge of
Washington-Kittitas Valley-Yakima Valley-Lower Columbia Basin of
Washington-Foothills of the Blue Mountains of Washington-Simcoe
Highlands-
Including the cities of Toppenish, Mitchell, Ione, White Salmon,
Ellensburg, Connell, Yakima, Monument, Pendleton, Sunnyside,
Goldendale, Moro, Thorp, Spray, Fossil, Waitsburg, Heppner,
Redmond, Dayville, Dayton, Prosser, Arlington, John Day,
Prineville, Bickleton, Condon, Madras, Boardman, Maupin, Pilot
Rock, Hermiston, Walla Walla, The Dalles, Dufur, Bend, Naches,
Tri-Cities, and Athena
1249 PM PDT Tue Jul 2 2024
...EXCESSIVE HEAT WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH 
TUESDAY EVENING...
* WHAT...Dangerously hot conditions with heat index values or 100 
  degrees and higher Friday through Tuesday and possibly longer.
* WHERE...Portions of central, north central, and northeast Oregon 
  and central, south central, and southeast Washington.
* WHEN...From Friday afternoon through Tuesday evening.
* IMPACTS...Heat related illnesses increase significantly during 
  extreme heat and high humidity 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.
&&
$$
JS

See also

• Severe weather terminology (United States)

References

1. National Weather Service. "Excessive Heat Watch". Glossary - National Weather Service. Retrieved 18 May 2011.
2. herzmann, daryl. "IEM :: Valid Time Event Code (VTEC) App". mesonet.agron.iastate.edu. Retrieved 2024-07-02.

External links

• National Weather Service

• Weather warnings and advisories