Heat advisory

A Heat Advisory is issued by the National Weather Service of the United States. Local offices often have their own criteria. High values of the heat index are caused by temperatures being significantly above normal and high humidities, and such high levels can pose a threat to human life through conditions such as heat stroke.[1]

Example

The following is an example of a Heat Advisory issued by the National Weather Service office in Norman, Oklahoma.[2]

URGENT - WEATHER MESSAGE
National Weather Service Norman OK
401 AM CDT Wed Jul 18 2018

...Hot Weather Continues Through The Work Week...

.Today will be another hot day with even hotter conditions
expected on Thursday and Friday afternoons.

OKZ007-008-012-013-018>020-023>048-050>052-TXZ083>090-181715-
/O.NEW.KOUN.HT.Y.0013.180718T1700Z-180721T0000Z/
Grant-Kay-Garfield-Noble-Kingfisher-Logan-Payne-Caddo-Canadian-
Oklahoma-Lincoln-Grady-McClain-Cleveland-Pottawatomie-Seminole-
Hughes-Harmon-Greer-Kiowa-Jackson-Tillman-Comanche-Stephens-
Garvin-Murray-Pontotoc-Coal-Cotton-Jefferson-Carter-Johnston-
Atoka-Love-Marshall-Bryan-Hardeman-Foard-Wilbarger-Wichita-Knox-
Baylor-Archer-Clay-
Including the cities of Medford, Pond Creek, Lamont, Wakita,
Ponca City, Blackwell, Enid, Perry, Kingfisher, Hennessey,
Okarche, Guthrie, Stillwater, Anadarko, Hinton, Yukon, Concho,
El Reno, Mustang, Oklahoma City, Chandler, Stroud, Prague,
Meeker, Davenport, Wellston, Chickasha, Tuttle, Purcell,
Newcastle, Blanchard, Norman, Moore, Shawnee, Seminole, Wewoka,
Holdenville, Wetumka, Hollis, Mangum, Granite, Hobart, Snyder,
Altus, Frederick, Lawton, Duncan, Pauls Valley, Lindsay,
Wynnewood, Sulphur, Davis, Ada, Coalgate, Walters, Temple,
Waurika, Ringling, Ryan, Ardmore, Tishomingo, Atoka, Marietta,
Thackerville, Madill, Kingston, Durant, Quanah, Crowell, Vernon,
Sheppard AFB, Wichita Falls, Munday, Knox City, Seymour,
Archer City, Holliday, Lakeside City, Scotland, and Henrietta
401 AM CDT Wed Jul 18 2018

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 7 PM CDT FRIDAY...

The National Weather Service in Norman has issued a Heat
Advisory, which is in effect from noon today to 7 PM CDT Friday.

* TEMPERATURES AND HEAT INDEX VALUES...Temperatures will reach 105
  to 110 across western north Texas and southwest Oklahoma, with
  heat index values of 105 to 110 across north central, central
  and south central Oklahoma. Low temperatures will only fall into
  the mid 70s to lower 80s overnight.

* TIMING...Through Friday afternoon.

* IMPACTS...The heat and humidity may cause heat stress during
  outdoor exertion or extended exposure.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Heat Advisory means that a period of hot temperatures is
expected. The combination of hot temperatures and high humidity
will combine to create a situation in which heat illnesses are
possible. Drink plenty of fluids, stay in an air-conditioned
room, stay out of the sun, and check up on relatives and
neighbors.

&&

$$

See also

References
  1. National Weather Service. "Heat Advisory". Glossary - National Weather Service. Retrieved 18 May 2011.
  2. National Weather Service. "Heat Advisory". Iowa Environmental Mesonet NWS Product Archive. Retrieved 18 May 2011.
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