Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 197, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Sep 26, 2021, 2:56 PM MST for Pima County, Arizona. It was in force for 49 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 26, 2021, 2:56 PM MST (21:56 UTC)
- Expired
- Sep 26, 2021, 3:45 PM MST
- In force
- 49 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 Tucson radar (KEMX), 54 km from the middle of the area, began a volume at 21:56 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 12:00Z, 9.9 hours before the alert went out and 50 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
- 252 J/kg
- Mixed-layer CIN
- -123 J/kg
- Mixed-layer LCL
- 1157 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
916
WUUS55 KTWC 262156
SVRTWC
AZC019-262245-
/O.NEW.KTWC.SV.W.0197.210926T2156Z-210926T2245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
256 PM MST Sun Sep 26 2021
The National Weather Service in Tucson has issued a
* Severe Thunderstorm Warning for...
East central Pima County in southeastern Arizona...
* Until 345 PM MST.
* At 256 PM MST, a severe thunderstorm was located 13 miles north of
Arivaca, or 16 miles west of Green Valley, moving northeast at 20
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...
Sahuarita, Green Valley and Arivaca Junction.
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 3175 11140 3193 11140 3198 11109 3187 11082
3173 11103 3173 11116 3170 11117 3170 11125
TIME...MOT...LOC 2156Z 228DEG 16KT 3177 11128
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
KRG1 follow-up statement
654
WWUS55 KTWC 262239
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
339 PM MST Sun Sep 26 2021
AZC019-262249-
/O.EXP.KTWC.SV.W.0197.000000T0000Z-210926T2245Z/
Pima-
339 PM MST Sun Sep 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PIMA COUNTY WILL
EXPIRE AT 345 PM MST...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small hail
and gusty winds are still possible with this thunderstorm.
LAT...LON 3175 11140 3193 11140 3198 11109 3187 11082
3173 11103 3173 11116 3170 11117 3170 11125
TIME...MOT...LOC 2239Z 228DEG 16KT 3190 11112
$$
KRGThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 25, 5:03 PM MST | Areal Flood Advisory | TWC | Cochise | 3 hr |
| Sep 25, 6:27 PM MST | Areal Flood Advisory | TWC | Cochise, Graham, Pima, Pinal | 3 hr |
| Sep 25, 6:46 PM MST | Flash Flood Warning | TWC | Pima, Pinal | 3 hr |
| Sep 25, 7:17 PM MST | Areal Flood Advisory | TWC | Pima | 3 hr |
| Sep 26, 11:51 AM MST | Special Weather Statement | TWC | Cochise | 39 min |
| Sep 26, 11:57 AM MST | Severe Thunderstorm Warning | TWC | Cochise | 28 min |
| Sep 26, 12:20 PM MST | Special Weather Statement | TWC | 40 min | |
| Sep 26, 12:44 PM MST | Special Weather Statement | TWC | Santa Cruz | 46 min |
| Sep 26, 12:58 PM MST | Special Weather Statement | TWC | Cochise | 47 min |
| Sep 26, 1:21 PM MST | Special Weather Statement | TWC | 39 min | |
| Sep 26, 1:40 PM MST | Severe Thunderstorm Warning | TWC | Pima, Santa Cruz | 50 min |
| Sep 26, 2:18 PM MST | Special Weather Statement | TWC | Santa Cruz | 42 min |
| Sep 26, 2:33 PM MST | Areal Flood Advisory | TWC | Pima, Santa Cruz | 104 min |
| Sep 26, 3:43 PM MST | Special Weather Statement | TWC | Santa Cruz | 47 min |
| Sep 26, 4:24 PM MST | Special Weather Statement | TWC | Pima | 51 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.