Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 111, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Sep 29, 2021, 10:27 PM MST for Pinal County, Arizona. It was in force for 48 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
- Sep 29, 2021, 10:27 PM MST (05:27 UTC)
- Expired
- Sep 29, 2021, 11:15 PM MST
- In force
- 48 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Pinal County, AZ
The radar
The Phoenix radar (KIWA), 44 km from the middle of the area, began a volume at 05:30 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
Tuscon, AZ (KTUS), launched 00:00Z, 5.5 hours before the alert went out and 116 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
- 314 J/kg
- Mixed-layer CIN
- -91 J/kg
- Mixed-layer LCL
- 2898 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
824
WUUS55 KPSR 300527
SVRPSR
AZC021-300615-
/O.NEW.KPSR.SV.W.0111.210930T0527Z-210930T0615Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
1027 PM MST Wed Sep 29 2021
The National Weather Service in Phoenix has issued a
* Severe Thunderstorm Warning for...
Pinal County in southeastern Arizona...
* Until 1115 PM MST.
* At 1027 PM MST, a severe thunderstorm was located near Casa Grande,
moving east at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Casa Grande, La Palma, Arizola, Randolph, Blackwater, Sacaton and
Stanfield.
This includes the following highways...
AZ Interstate 10 between mile markers 180 and 200.
AZ Interstate 8 between mile markers 166 and 178.
AZ Route 87 between mile markers 124 and 128, and between mile
markers 138 and 150.
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 3296 11201 3314 11169 3288 11148 3283 11154
3278 11184 3279 11187
TIME...MOT...LOC 0527Z 252DEG 13KT 3289 11181
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SDB2 follow-up statements
271
WWUS55 KPSR 300553
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
1053 PM MST Wed Sep 29 2021
AZC021-300615-
/O.CON.KPSR.SV.W.0111.000000T0000Z-210930T0615Z/
Pinal AZ-
1053 PM MST Wed Sep 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM MST
FOR PINAL COUNTY...
At 1052 PM MST, a severe thunderstorm was located over Arizola, or
near Casa Grande, moving east at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Casa Grande, La Palma, Arizola, Randolph and Blackwater.
This includes the following highways...
AZ Interstate 10 between mile markers 184 and 200.
AZ Interstate 8 between mile markers 168 and 178.
AZ Route 87 between mile markers 124 and 128, and between mile
markers 138 and 146.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3278 11184 3294 11193 3309 11165 3288 11148
3283 11154
TIME...MOT...LOC 0552Z 266DEG 12KT 3284 11173
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SDB324
WWUS55 KPSR 300610
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
1110 PM MST Wed Sep 29 2021
AZC021-300620-
/O.EXP.KPSR.SV.W.0111.000000T0000Z-210930T0615Z/
Pinal AZ-
1110 PM MST Wed Sep 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR PINAL COUNTY WILL EXPIRE AT
1115 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 small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.
LAT...LON 3278 11184 3294 11193 3309 11165 3288 11148
3283 11154
TIME...MOT...LOC 0610Z 252DEG 13KT 3286 11167
$$
SDBThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 29, 5:09 PM MST | Special Weather Statement | PSR | Yuma | 51 min |
| Sep 29, 6:34 PM MST | Special Weather Statement | PSR | 26 min | |
| Sep 29, 7:36 PM MST | Special Weather Statement | PSR | La Paz | 39 min |
| Sep 29, 8:00 PM MST | Areal Flood Advisory | PSR | Yuma | 3 hr |
| Sep 29, 8:20 PM MST | Special Weather Statement | PSR | La Paz | 40 min |
| Sep 29, 10:10 PM MST | Special Weather Statement | PSR | Pinal | 35 min |
| Sep 29, 11:02 PM MST | Areal Flood Advisory | PSR | Pinal | 3 hr |
| Sep 29, 11:13 PM MST | Special Weather Statement | PSR | Pinal | 32 min |
| Sep 29, 11:45 PM MST | Special Weather Statement | PSR | Pinal | 45 min |
| Sep 29, 11:55 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 35 min |
| Sep 30, 12:42 AM MST | Severe Thunderstorm Warning | PSR | Gila, Pinal | 48 min |
| Sep 30, 1:00 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Sep 30, 1:30 AM MST | Special Weather Statement | PSR | 30 min | |
| Sep 30, 2:47 PM MST | Special Weather Statement | PSR | 43 min | |
| Sep 30, 3:39 PM MST | Areal Flood Advisory | PSR | Maricopa | 8 hr |
| Sep 30, 4:21 PM MST | Special Weather Statement | PSR | 39 min | |
| Sep 30, 4:26 PM MST | Special Weather Statement | PSR | 49 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.