Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 30, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 21, 2021, 4:01 PM MST for Maricopa County, Arizona. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2021, 4:01 PM MST (23:01 UTC)
- Expired
- Jul 21, 2021, 4:30 PM MST
- In force
- 29 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 124 km from the middle of the area, began a volume at 23:04 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.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 12:00Z, 11.0 hours before the alert went out and 93 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
- 5 J/kg
- Mixed-layer CIN
- -244 J/kg
- Mixed-layer LCL
- 2438 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
353
WUUS55 KPSR 212301
SVRPSR
AZC013-212330-
/O.NEW.KPSR.SV.W.0030.210721T2301Z-210721T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
401 PM MST Wed Jul 21 2021
The National Weather Service in Phoenix has issued a
* Severe Thunderstorm Warning for...
Maricopa County in south central Arizona...
* Until 430 PM MST.
* At 401 PM MST, a severe thunderstorm was located over Wickenburg,
moving northwest at 10 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Wickenburg.
* This includes US Highway 60 between mile markers 103 and 119.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3398 11269 3396 11257 3384 11266 3399 11293
3400 11292 3400 11273
TIME...MOT...LOC 2301Z 122DEG 8KT 3397 11273
HAIL...<.75IN
WIND...60MPH
$$
CK3 follow-up statements
360
WWUS55 KPSR 212318
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
418 PM MST Wed Jul 21 2021
AZC013-212330-
/O.CON.KPSR.SV.W.0030.000000T0000Z-210721T2330Z/
Maricopa AZ-
418 PM MST Wed Jul 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM MST
FOR MARICOPA COUNTY...
At 417 PM MST, a severe thunderstorm was located over Wickenburg,
moving northwest at 10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Wickenburg.
This includes US Highway 60 between mile markers 103 and 119.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3398 11269 3396 11257 3384 11266 3399 11293
3400 11292 3400 11273
TIME...MOT...LOC 2317Z 122DEG 8KT 3399 11277
HAIL...0.75IN
WIND...60MPH
$$
CK307
WWUS55 KPSR 212321
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
421 PM MST Wed Jul 21 2021
AZC013-212330-
/O.CON.KPSR.SV.W.0030.000000T0000Z-210721T2330Z/
Maricopa AZ-
421 PM MST Wed Jul 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM MST
FOR MARICOPA COUNTY...
At 420 PM MST, a severe thunderstorm was located near Wickenburg,
moving east at 10 mph.
HAZARD...70 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Wickenburg.
This includes US Highway 60 between mile markers 103 and 119.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3398 11269 3396 11257 3384 11266 3399 11293
3400 11292 3400 11273
TIME...MOT...LOC 2320Z 266DEG 7KT 3396 11266
HAIL...0.88IN
WIND...70MPH
$$
CK564
WWUS55 KPSR 212329
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
429 PM MST Wed Jul 21 2021
AZC013-212339-
/O.EXP.KPSR.SV.W.0030.000000T0000Z-210721T2330Z/
Maricopa AZ-
429 PM MST Wed Jul 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR MARICOPA COUNTY WILL EXPIRE AT
430 PM MST...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
LAT...LON 3398 11269 3396 11257 3384 11266 3399 11293
3400 11292 3400 11273
TIME...MOT...LOC 2329Z 122DEG 8KT 3397 11267
$$
CKThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 5:15 PM MST | Special Weather Statement | PSR | La Paz | 45 min |
| Jul 20, 5:21 PM MST | Special Weather Statement | PSR | Gila | 39 min |
| Jul 20, 5:32 PM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 20, 6:22 PM MST | Special Weather Statement | PSR | 38 min | |
| Jul 20, 7:22 PM MST | Special Weather Statement | PSR | Pinal | 53 min |
| Jul 20, 8:19 PM MST | Special Weather Statement | PSR | Pinal | 41 min |
| Jul 20, 8:56 PM MST | Special Weather Statement | PSR | Pinal | 49 min |
| Jul 20, 11:51 PM MST | Special Weather Statement | PSR | 39 min | |
| Jul 21, 2:21 AM MST | Flash Flood Watch | PSR | Gila, Maricopa, Pinal | 5 days |
| Jul 21, 8:12 AM MST | Blowing Dust Advisory | PSR | La Paz, Maricopa, Yuma | 12 hr |
| Jul 21, 2:45 PM MST | Special Weather Statement | PSR | 45 min | |
| Jul 21, 2:46 PM MST | Dust Storm Warning | PSR | Pinal | 40 min |
| Jul 21, 3:07 PM MST | Special Weather Statement | PSR | 38 min | |
| Jul 21, 3:34 PM MST | Special Weather Statement | PSR | Maricopa | 41 min |
| Jul 21, 3:37 PM MST | Special Weather Statement | PSR | La Paz | 38 min |
| Jul 21, 3:42 PM MST | Special Weather Statement | PSR | Yuma | 48 min |
| Jul 21, 3:45 PM MST | Special Weather Statement | PSR | Maricopa | 45 min |
| Jul 21, 3:46 PM MST | Special Weather Statement | PSR | 29 min | |
| Jul 21, 3:51 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 21, 3:53 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 37 min |
| Jul 21, 3:55 PM MST | Special Weather Statement | PSR | Maricopa | 50 min |
| Jul 21, 4:11 PM MST | Special Weather Statement | PSR | La Paz | 49 min |
| Jul 21, 4:26 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 21, 4:28 PM MST | Special Weather Statement | PSR | Maricopa | 47 min |
| Jul 21, 4:32 PM MST | Special Weather Statement | PSR | 28 min | |
| Jul 21, 4:55 PM MST | Flash Flood Warning | PSR | La Paz | 4 hr |
| Jul 21, 4:59 PM MST | Special Weather Statement | PSR | 46 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2021Every severe thunderstorm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.