Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 168, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 28, 2021, 8:03 PM MST for Pima County, Arizona. It was in force for 57 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
- Aug 28, 2021, 8:03 PM MST (03:03 UTC)
- Expired
- Aug 28, 2021, 9:00 PM MST
- In force
- 57 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Pima County, AZ
The radar
The Phoenix radar (KIWA), 149 km from the middle of the area, began a volume at 03:06 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 00:00Z, 3.1 hours before the alert went out and 149 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
- 645 J/kg
- Mixed-layer CIN
- -152 J/kg
- Mixed-layer LCL
- 3094 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
275
WUUS55 KTWC 290303
SVRTWC
AZC019-290400-
/O.NEW.KTWC.SV.W.0168.210829T0303Z-210829T0400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
803 PM MST Sat Aug 28 2021
The National Weather Service in Tucson has issued a
* Severe Thunderstorm Warning for...
Northwestern Pima County in southeastern Arizona...
* Until 900 PM MST.
* At 803 PM MST, a severe thunderstorm was located 7 miles northwest
of Gu Vo, or 20 miles southeast of Ajo, and is nearly stationary.
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...
Gu Vo, Hickiwan, Organ Pipe Cactus National Monument, Why, Charco
27, Gunsight and Kuakatch.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3203 11255 3212 11286 3243 11269 3239 11231
TIME...MOT...LOC 0303Z 200DEG 2KT 3215 11264
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
GL2 follow-up statements
991
WWUS55 KTWC 290326
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
826 PM MST Sat Aug 28 2021
AZC019-290400-
/O.CON.KTWC.SV.W.0168.000000T0000Z-210829T0400Z/
Pima-
826 PM MST Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MST
FOR NORTHWESTERN PIMA COUNTY...
At 826 PM MST, a severe thunderstorm was located 10 miles southwest
of Hickiwan, or 17 miles southeast of Ajo, and is nearly stationary.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Gu Vo, Hickiwan, Organ Pipe Cactus National Monument, Why, Charco 27,
Gunsight and Kuakatch.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3203 11255 3212 11286 3243 11269 3239 11231
TIME...MOT...LOC 0326Z 073DEG 3KT 3225 11262
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
GL352
WWUS55 KTWC 290353
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
853 PM MST Sat Aug 28 2021
AZC019-290402-
/O.EXP.KTWC.SV.W.0168.000000T0000Z-210829T0400Z/
Pima-
853 PM MST Sat Aug 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN PIMA COUNTY WILL
EXPIRE AT 900 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 and a
Flash Flood Warning remains in effect.
LAT...LON 3203 11255 3212 11286 3243 11269 3239 11231
TIME...MOT...LOC 0352Z 200DEG 2KT 3226 11262
$$
GLThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 5:03 PM MST | Flash Flood Warning | TWC | Pima, Pinal | 117 min |
| Aug 28, 5:12 PM MST | Special Weather Statement | TWC | Pinal | 48 min |
| Aug 28, 5:20 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 40 min |
| Aug 28, 6:31 PM MST | Severe Thunderstorm Warning | TWC | Pima | 44 min |
| Aug 28, 6:47 PM MST | Special Weather Statement | TWC | Pinal | 43 min |
| Aug 28, 7:01 PM MST | Areal Flood Warning | TWC | Pima, Pinal | 3 hr |
| Aug 28, 7:14 PM MST | Severe Thunderstorm Warning | TWC | Pima | 61 min |
| Aug 28, 7:41 PM MST | Flash Flood Warning | TWC | Pima | 109 min |
| Aug 28, 8:25 PM MST | Flash Flood Warning | TWC | Pima | 2 hr |
| Aug 29, 2:32 PM MST | Special Weather Statement | TWC | Cochise | 43 min |
| Aug 29, 3:53 PM MST | Special Weather Statement | TWC | Pima | 37 min |
| Aug 29, 4:23 PM MST | Areal Flood Advisory | TWC | Pima | 112 min |
| Aug 29, 4:46 PM MST | Special Weather Statement | TWC | Pinal | 59 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.