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An excessive heat warning is a notice issued by the National Weather Service of the United States within 12 hours of the heat index reaching one of two criteria levels. In most areas, a warning will be issued if there is a heat index of at least 105 °F (41 °C) for more than three hours per day for two consecutive days, or if the heat index is greater than 115 °F (46 °C) for any period of time.^[1]

Excessive heat can pose a threat to human life and other animals, through conditions such as heat stroke, heat exhaustion, dehydration, and other heat-related illnesses.^[1]

Criteria

Local offices, particularly those where excessive heat is less frequent or in areas with deserts or mountainous terrain, often have their own criteria.^[1]

Dangers

Due to the extreme illnesses that can occur, athletes should limit their physical activity when an excessive-heat warning is issued. According to the National High-School Sports-Related Injury-Surveillance System, High-School RIO, an estimated number of 51,943 excessive-heat illnesses occurred in nine of the high-school sports observed between 2005, 2011, and 2020.^{[full citation needed]}

Example

The following is an example of an excessive heat warning issued by the National Weather Service office in San Antonio, Texas on June 11, 2022 during a severe heat wave.


692
WWUS74 KEWX 111801
NPWEWX

URGENT - WEATHER MESSAGE
National Weather Service Austin/San Antonio TX
101 PM CDT Sat Jun 11 2022

TXZ171>173-191>193-203>208-219>222-120900-
/O.UPG.KEWX.HT.Y.0005.000000T0000Z-220613T0000Z/
/O.NEW.KEWX.EH.W.0001.220611T1801Z-220613T0000Z/
Llano-Burnet-Williamson-Hays-Travis-Bastrop-Uvalde-Medina-Bexar-
Comal-Guadalupe-Caldwell-Frio-Atascosa-Wilson-Karnes-
Including the cities of Llano, Burnet, Georgetown, San Marcos,
Austin, Bastrop, Uvalde, Hondo, San Antonio, New Braunfels,
Seguin, Lockhart, Pearsall, Pleasanton, Floresville,
and Karnes City
101 PM CDT Sat Jun 11 2022

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 7 PM CDT SUNDAY...

* WHAT...Air temperatures ranging from 103 to 107, as well as heat
  index values up to 105 to 110 expected.

* WHERE...Portions of south central Texas.

* WHEN...Until 7 PM CDT Sunday.

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

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. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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. 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.

&&

$$

^[2]

References

^ ^a ^b ^c National Weather Service. "Excessive Heat Warning". Glossary - National Weather Service. Retrieved 17 June 2024.
^ "Excessive Heat Warning". Iowa Environmental Mesonet. Retrieved 20 June 2022.

External links

National Weather Service

[nws-1] National Weather Service. "Excessive Heat Warning". Glossary - National Weather Service. Retrieved 17 June 2024.

[2] "Excessive Heat Warning". Iowa Environmental Mesonet. Retrieved 20 June 2022.

[1]

[2]

@@ Line 1: / Line 1: @@
+{{short description|Weather warning issued by the U.S. National Weather Service indicating excessive heat index values}}
-An '''Excessive Heat Warning''' is issued by the [[National Weather Service]] of the [[United States]] when within 12 hours of the the [[heat index]] reaching one of two criteria levels.  A warning will be issued if there is a heat index of at least 105°F for more than 3 hours per day for 2 consecutive days, or if the heat index is greater than 115°F for any period of time.  High values of the heat index are caused by [[temperatures]] being significantly above normal and high [[Relative humidity|humidities]], and such high levels can pose a threat to human life through condidtions such as [[heat stroke]].<ref>{{cite web|title=Excessive Heat Warning|url=http://www.weather.gov/glossary/index.php?word=excessive+heat+warning|work=Glossary - National Weather Service|accessdate=18 May 2011|author=National Weather Service}}</ref>
+An '''excessive heat warning''' is a notice issued by the [[National Weather Service]] of the [[United States]] within 12 hours of the [[heat index]] reaching one of two criteria levels. In most areas, a warning will be issued if there is a heat index of at least {{convert|105|F|C}} for more than three hours per day for two consecutive days, or if the heat index is greater than {{convert|115|F|C}} for any period of time.<ref name="nws">{{cite web|title=Excessive Heat Warning|url=https://forecast.weather.gov/glossary.php?word=excessive+heat+warning|work=Glossary - National Weather Service|access-date=17 June 2024|author=National Weather Service}}</ref>
+Excessive heat can pose a threat to human life and other animals, through conditions such as [[heat stroke]], [[heat exhaustion]], [[dehydration]], and other heat-related illnesses.<ref name="nws" />
+==Criteria==
+Local offices, particularly those where excessive heat is less frequent or in areas with deserts or mountainous terrain, often have their own criteria.<ref name="nws" />
+==Dangers==
+Due to the extreme illnesses that can occur, athletes should limit their physical activity when an excessive-heat warning is issued.  According to the National High-School Sports-Related Injury-Surveillance System, High-School RIO, an estimated number of 51,943 excessive-heat illnesses occurred in nine of the high-school sports observed between 2005, 2011, and 2020.{{full citation needed|date=December 2019}}
 ==Example==
-The following is an example of an Excessive Heat Warning issued by the National Weather Service office in [[Nashville, Tennessee]].<ref>{{cite web|title=Excessive Heat Warning|url=http://mesonet.agron.iastate.edu/vtec/2008-O-NEW-KDMX-TO-W-0013.html#2010-O-NEW-KOHX-EH-W-0001|work=Iowa Environmental Mesonet NWS Product Archive|accessdate=18 May 2011|author=National Weather Service}}</ref>
+The following is an example of an excessive heat warning issued by the National Weather Service office in [[San Antonio, Texas]] on June 11, 2022 during a severe heat wave.
 <pre>
-WWUS74 KOHX 040750
+WWUS74 KEWX 111801
-NPWOHX
+NPWEWX
 URGENT - WEATHER MESSAGE
+National Weather Service Austin/San Antonio TX
-NATIONAL WEATHER SERVICE NASHVILLE TN
-AM CDT WED AUG 4 2010
+PM CDT Sat Jun 11 2022
+TXZ171>173-191>193-203>208-219>222-120900-
-...EXCESSIVE HEAT WARNING IS IN EFFECT FOR THE WESTERN HALF OF
+/O.UPG.KEWX.HT.Y.0005.000000T0000Z-220613T0000Z/
-MIDDLE TENNESSEE UNTIL 7 PM CDT THURSDAY...
+/O.NEW.KEWX.EH.W.0001.220611T1801Z-220613T0000Z/
+Llano-Burnet-Williamson-Hays-Travis-Bastrop-Uvalde-Medina-Bexar-
+Comal-Guadalupe-Caldwell-Frio-Atascosa-Wilson-Karnes-
+Including the cities of Llano, Burnet, Georgetown, San Marcos,
+Austin, Bastrop, Uvalde, Hondo, San Antonio, New Braunfels,
+Seguin, Lockhart, Pearsall, Pleasanton, Floresville,
+and Karnes City
+PM CDT Sat Jun 11 2022
+...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 7 PM CDT SUNDAY...
-...HEAT ADVISORY CONTINUES FOR PORTIONS OF EASTERN MIDDLE TENNESSEE
-UNTIL 7 PM CDT THURSDAY...
+* WHAT...Air temperatures ranging from 103 to 107, as well as heat
-.A STRONG UPPER LEVEL HIGH PRESSURE SYSTEM WILL PRODUCE HOT AND
+  index values up to 105 to 110 expected.
-HUMID CONDITIONS THROUGH THURSDAY.
+* WHERE...Portions of south central Texas.
-TNZ005>008-022>028-056>062-075-093>095-042100-
-/O.UPG.KOHX.HT.Y.0005.000000T0000Z-100806T0000Z/
-/O.NEW.KOHX.EH.W.0001.100804T0750Z-100806T0000Z/
-STEWART-MONTGOMERY-ROBERTSON-SUMNER-BENTON-HOUSTON-HUMPHREYS-
-DICKSON-CHEATHAM-DAVIDSON-WILSON-PERRY-HICKMAN-LEWIS-WILLIAMSON-
-MAURY-MARSHALL-RUTHERFORD-BEDFORD-WAYNE-LAWRENCE-GILES-
-INCLUDING THE CITIES OF...DOVER...CLARKSVILLE...SPRINGFIELD...
-GALLATIN...CAMDEN...ERIN...WAVERLY...DICKSON...ASHLAND CITY...
-NASHVILLE...LEBANON...MOUNT JULIET...LOBELVILLE...CENTERVILLE...
-HOHENWALD...FRANKLIN...BRENTWOOD...COLUMBIA...LEWISBURG...
-MURFREESBORO...SHELBYVILLE...WAYNESBORO...LAWRENCEBURG...PULASKI
-AM CDT WED AUG 4 2010
-...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 7 PM CDT THURSDAY...
+* WHEN...Until 7 PM CDT Sunday.
+* IMPACTS...Extreme heat and humidity will significantly
-THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED AN EXCESSIVE
+  increase the potential for heat related illnesses,
-HEAT WARNING...WHICH IS IN EFFECT UNTIL 7 PM CDT THURSDAY. THE
+  particularly for those working or participating in outdoor
-HEAT ADVISORY IS NO LONGER IN EFFECT.
+  activities.
-* HEAT INDEX READINGS WILL RANGE FROM 107 TO 115 DEGREES THIS
-  AFTERNOON.
-* IMPACTS: DANGEROUS HEAT LEVELS WILL OCCUR THROUGH THURSDAY FOR
-  THOSE PEOPLE WHO MUST BE OUTDOORS. YOUNG CHILDREN...ELDERLY
-  PEOPLE...THOSE WITH ILLNESSES OR HEART CONDITIONS...AND THOSE
-  WHO WORK OR PLAY OUTDOORS ARE MOST AT RISK.
 PRECAUTIONARY/PREPAREDNESS ACTIONS...
+Drink plenty of fluids, stay in an air-conditioned room, stay out
-AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
+of the sun, and check up on relatives and neighbors. Young
-DANGEROUSLY HOT TEMPERATURES WILL OCCUR. THE COMBINATION OF HOT
+children and pets should never be left unattended in vehicles
-TEMPERATURES AND HIGH HUMIDITY WILL COMBINE TO CREATE A DANGEROUS
+under any circumstances.
-SITUATION IN WHICH HEAT ILLNESSES ARE LIKELY. DRINK PLENTY OF
-FLUIDS...STAY IN AN AIR-CONDITIONED ROOM...STAY OUT OF THE SUN...
+Take extra precautions if you work or spend time outside. When
-AND CHECK UP ON RELATIVES AND NEIGHBORS.
+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. 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.
 &&
 $$
-</pre>
-==See also==
+</pre><ref>{{cite web |title=Excessive Heat Warning |url=https://mesonet.agron.iastate.edu/vtec/#2022-O-NEW-KEWX-EH-W-0001/USCOMP-N0Q-202206111800 |website=Iowa Environmental Mesonet |access-date=20 June 2022}}</ref>
-* [[Severe weather terminology (United States)]]
+== See also ==
+* [[Extreme cold warning]] – the polar opposite of an Excessive heat warning
 ==References==
 {{Reflist}}
 ==External links==
 * [http://www.nws.noaa.gov/ National Weather Service]