Alert archive / Arizona / Excessive Heat Warnings in 2021
Excessive Heat Warning 3, NWS Tucson, AZ
NWS Tucson, AZ issued this excessive heat warning at Aug 24, 2021, 2:23 PM MST for 6 counties in Arizona. It took effect at Aug 25, 2021, 10:00 AM MST. It was in force for 58 hr. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 24, 2021, 2:23 PM MST (21:23 UTC)
- In effect from
- Aug 25, 2021, 10:00 AM MST
- Expired
- Aug 27, 2021, 8:00 PM MST
- In force
- 58 hr
- Issued by
- NWS Tucson, AZ
Counties Cochise County, AZ, Graham County, AZ, Greenlee County, AZ, Pima County, AZ, Pinal County, AZ, Santa Cruz County, AZ
The radar
The Tucson radar (KEMX), 61 km from the middle of the area, began a volume at 21:24 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 27, 4:36 PM MST | TSTM WND GST 62 | 4 Ene Safford, AZ | ASOS STATION KSAD SAFFORD REGIONAL AIRPORT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 9.4 hours before the alert went out and 49 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 97 J/kg
- Mixed-layer CIN
- -266 J/kg
- Mixed-layer LCL
- 1989 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- -2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
215 WWUS75 KTWC 242123 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 223 PM MST Tue Aug 24 2021 AZZ501-502-504-505-250530- /O.UPG.KTWC.EH.A.0003.210825T1700Z-210828T0300Z/ /O.NEW.KTWC.EH.W.0003.210825T1700Z-210828T0300Z/ Western Pima County-Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County- Including the cities of Ajo, Organ Pipe Cactus N.M., Sells, Tucson, Green Valley, Marana, Vail, and Picacho Peak State Park 223 PM MST Tue Aug 24 2021 ...EXCESSIVE HEAT WARNING IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM MST FRIDAY... * WHAT...Dangerously hot conditions. Afternoon temperatures 105 to 112 degrees. * WHERE...Western Pima County, Tohono O'odham Nation, Tucson Metro Area, and South Central Pinal County. * WHEN...From 10 AM Wednesday to 8 PM MST Friday. * 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... Keep in mind you may need to adjust your plans based on the latest health and safety guidelines from CDC and your local officials. Cooling shelters may need to take your temperature or ask questions about how you are feeling. 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. && $$ AZZ506-507-509-250530- /O.NEW.KTWC.EH.W.0003.210825T1700Z-210828T0300Z/ Southeast Pinal County-Upper San Pedro River Valley- Upper Gila River Valley- Including the cities of Mammoth, Oracle, and Safford 223 PM MST Tue Aug 24 2021 ...EXCESSIVE HEAT WARNING IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM MST FRIDAY... * WHAT...Dangerously hot conditions. Afternoon temperatures 105 to 111 degrees. * WHERE...Southeast Pinal County, Upper San Pedro River Valley and Upper Gila River Valley. * WHEN...From 10 AM Wednesday to 8 PM MST Friday. * IMPACTS...Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Keep in mind you may need to adjust your plans based on the latest health and safety guidelines from CDC and your local officials. Cooling shelters may need to take your temperature or ask questions about how you are feeling. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
8 follow-up statements
392 WWUS75 KTWC 250446 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 946 PM MST Tue Aug 24 2021 AZZ501-502-504>507-509-251300- /O.CON.KTWC.EH.W.0003.210825T1700Z-210828T0300Z/ Western Pima County-Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County-Southeast Pinal County- Upper San Pedro River Valley-Upper Gila River Valley- Including the cities of Ajo, Organ Pipe Cactus N.M., Sells, Tucson, Green Valley, Marana, Vail, Picacho Peak State Park, Mammoth, Oracle, and Safford 946 PM MST Tue Aug 24 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM MST FRIDAY... * WHAT...Dangerously hot conditions. Afternoon temperatures 105 to 112 degrees. * WHERE...Western Pima County, Tohono O'odham Nation, Tucson Metro Area, and South Central Pinal County. * WHEN...From 10 AM Wednesday to 8 PM MST Friday. * 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... Keep in mind you may need to adjust your plans based on the latest health and safety guidelines from CDC and your local officials. Cooling shelters may need to take your temperature or ask questions about how you are feeling. 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. && $$ Meyer Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
854 WWUS75 KTWC 250923 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 223 AM MST Wed Aug 25 2021 AZZ501-502-504>507-509-252000- /O.CON.KTWC.EH.W.0003.210825T1700Z-210828T0300Z/ Western Pima County-Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County-Southeast Pinal County- Upper San Pedro River Valley-Upper Gila River Valley- Including the cities of Ajo, Organ Pipe Cactus N.M., Sells, Tucson, Green Valley, Marana, Vail, Picacho Peak State Park, Mammoth, Oracle, and Safford 223 AM MST Wed Aug 25 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM MST FRIDAY... * WHAT...Dangerously hot conditions. Afternoon temperatures 105 to 112 degrees. * WHERE...Western Pima County, Tohono O'odham Nation, Tucson Metro Area, and South Central Pinal County. * WHEN...From 10 AM Wednesday to 8 PM MST Friday. * 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... Keep in mind you may need to adjust your plans based on the latest health and safety guidelines from CDC and your local officials. Cooling shelters may need to take your temperature or ask questions about how you are feeling. 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. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
565 WWUS75 KTWC 252133 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 233 PM MST Wed Aug 25 2021 AZZ501-502-504>507-509-260545- /O.CON.KTWC.EH.W.0003.000000T0000Z-210828T0300Z/ Western Pima County-Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County-Southeast Pinal County- Upper San Pedro River Valley-Upper Gila River Valley- Including the cities of Ajo, Organ Pipe Cactus N.M., Sells, Tucson, Green Valley, Marana, Vail, Picacho Peak State Park, Mammoth, Oracle, and Safford 233 PM MST Wed Aug 25 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY... * WHAT...Dangerously hot conditions. Afternoon temperatures 105 to 112 degrees. * WHERE...Western Pima County, Tohono O'odham Nation, Tucson Metro Area, South Central Pinal County, Southeast Pinal County, Upper San Pedro River Valley and Upper Gila River Valley. * WHEN...Until 8 PM MST Friday. * 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... Keep in mind you may need to adjust your plans based on the latest health and safety guidelines from CDC and your local officials. Cooling shelters may need to take your temperature or ask questions about how you are feeling. 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. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
647 WWUS75 KTWC 260446 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 946 PM MST Wed Aug 25 2021 AZZ501-502-504>507-509-261300- /O.CON.KTWC.EH.W.0003.000000T0000Z-210828T0300Z/ Western Pima County-Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County-Southeast Pinal County- Upper San Pedro River Valley-Upper Gila River Valley- Including the cities of Ajo, Organ Pipe Cactus N.M., Sells, Tucson, Green Valley, Marana, Vail, Picacho Peak State Park, Mammoth, Oracle, and Safford 946 PM MST Wed Aug 25 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY... * WHAT...Dangerously hot conditions. Afternoon temperatures 105 to 112 degrees. * WHERE...Western Pima County, Tohono O'odham Nation, Tucson Metro Area, South Central Pinal County, Southeast Pinal County, Upper San Pedro River Valley and Upper Gila River Valley. * WHEN...Until 8 PM MST Friday. * 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... Keep in mind you may need to adjust your plans based on the latest health and safety guidelines from CDC and your local officials. Cooling shelters may need to take your temperature or ask questions about how you are feeling. 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. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
288 WWUS75 KTWC 260939 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 239 AM MST Thu Aug 26 2021 AZZ501-502-504>507-509-262000- /O.CON.KTWC.EH.W.0003.000000T0000Z-210828T0300Z/ Western Pima County-Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County-Southeast Pinal County- Upper San Pedro River Valley-Upper Gila River Valley- Including the cities of Ajo, Organ Pipe Cactus N.M., Sells, Tucson, Green Valley, Marana, Vail, Picacho Peak State Park, Mammoth, Oracle, and Safford 239 AM MST Thu Aug 26 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY... * WHAT...Dangerously hot conditions. Afternoon temperatures 105 to 112 degrees. * WHERE...Western Pima County, Tohono O'odham Nation, Tucson Metro Area, South Central Pinal County, Southeast Pinal County, Upper San Pedro River Valley and Upper Gila River Valley. * WHEN...Until 8 PM MST Friday. * 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... Keep in mind you may need to adjust your plans based on the latest health and safety guidelines from CDC and your local officials. Cooling shelters may need to take your temperature or ask questions about how you are feeling. 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. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
322 WWUS75 KTWC 262153 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 253 PM MST Thu Aug 26 2021 AZZ501-502-504>507-509-271700- /O.CON.KTWC.EH.W.0003.000000T0000Z-210828T0300Z/ Western Pima County-Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County-Southeast Pinal County- Upper San Pedro River Valley-Upper Gila River Valley- Including the cities of Ajo, Organ Pipe Cactus N.M., Sells, Tucson, Green Valley, Marana, Vail, Picacho Peak State Park, Mammoth, Oracle, and Safford 253 PM MST Thu Aug 26 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY... * WHAT...Dangerously hot conditions. Afternoon temperatures 102 to 110 degrees. Hottest temperatures in the lower deserts west of Tucson. * WHERE...Western Pima County, Tohono O'odham Nation, Tucson Metro Area, South Central Pinal County, Southeast Pinal County, Upper San Pedro River Valley and Upper Gila River Valley. * WHEN...Until 8 PM MST Friday. * 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... Keep in mind you may need to adjust your plans based on the latest health and safety guidelines from CDC and your local officials. Cooling shelters may need to take your temperature or ask questions about how you are feeling. 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. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
076 WWUS75 KTWC 271659 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 959 AM MST Fri Aug 27 2021 AZZ501-502-504>507-509-280300- /O.CON.KTWC.EH.W.0003.000000T0000Z-210828T0300Z/ Western Pima County-Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County-Southeast Pinal County- Upper San Pedro River Valley-Upper Gila River Valley- Including the cities of Ajo, Organ Pipe Cactus N.M., Sells, Tucson, Green Valley, Marana, Vail, Picacho Peak State Park, Mammoth, Oracle, and Safford 959 AM MST Fri Aug 27 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING... * WHAT...Dangerously hot conditions. Afternoon temperatures 102 to 110 degrees. Hottest temperatures in the lower deserts west of Tucson. * WHERE...Western Pima County, Tohono O'odham Nation, Tucson Metro Area, South Central Pinal County, Southeast Pinal County, Upper San Pedro River Valley and Upper Gila River Valley. * WHEN...Until 8 PM MST Friday. * 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... Keep in mind you may need to adjust your plans based on the latest health and safety guidelines from CDC and your local officials. Cooling shelters may need to take your temperature or ask questions about how you are feeling. 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. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
427 WWUS75 KTWC 280254 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 754 PM MST Fri Aug 27 2021 AZZ501-502-504>507-509-280400- /O.EXP.KTWC.EH.W.0003.000000T0000Z-210828T0300Z/ Western Pima County-Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County-Southeast Pinal County- Upper San Pedro River Valley-Upper Gila River Valley- Including the cities of Ajo, Organ Pipe Cactus N.M., Sells, Tucson, Green Valley, Marana, Vail, Picacho Peak State Park, Mammoth, Oracle, and Safford 754 PM MST Fri Aug 27 2021 ...EXCESSIVE HEAT WARNING WILL EXPIRE AT 8 PM MST THIS EVENING... Temperatures will continue to lower through the rest of this evening. Therefore, the warning will be allowed to expire at 8 pm MST. $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 5:09 PM MST | Special Weather Statement | TWC | Graham | 51 min |
Nearby
Excessive Heat Warnings in Arizona, 2021Every excessive heat warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.