Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 140, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 15, 2021, 8:30 PM MST for Graham County, Pinal County, Arizona. It was in force for 46 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 15, 2021, 8:30 PM MST (03:30 UTC)
- Expired
- Aug 15, 2021, 9:16 PM MST
- In force
- 46 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Graham County, AZ, Pinal County, AZ
The radar
The Phoenix radar (KIWA), 120 km from the middle of the area, began a volume at 03:33 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, 3.5 hours before the alert went out and 133 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
- 1359 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1761 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
220
WUUS55 KTWC 160330
SVRTWC
AZC009-021-160430-
/O.NEW.KTWC.SV.W.0140.210816T0330Z-210816T0430Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
830 PM MST Sun Aug 15 2021
The National Weather Service in Tucson has issued a
* Severe Thunderstorm Warning for...
Northwestern Graham County in southeastern Arizona...
Eastern Pinal County in southeastern Arizona...
* Until 930 PM MST.
* At 829 PM MST, a severe thunderstorm was located 13 miles east of
San Carlos, or 30 miles east of Globe, moving southwest at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
San Carlos Reservoir and Peridot.
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 3337 10997 3298 11050 3310 11068 3314 11064
3313 11059 3316 11053 3318 11053 3320 11040
3328 11046 3339 11044 3340 11041 3340 11036
3343 11032 3347 11012 3347 11009
TIME...MOT...LOC 0329Z 052DEG 32KT 3339 11023
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JRM2 follow-up statements
394
WWUS55 KTWC 160357
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
857 PM MST Sun Aug 15 2021
AZC009-021-160430-
/O.CON.KTWC.SV.W.0140.000000T0000Z-210816T0430Z/
Graham-Pinal-
857 PM MST Sun Aug 15 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM MST
FOR WEST CENTRAL GRAHAM AND EASTERN PINAL COUNTIES...
At 857 PM MST, a severe thunderstorm was located 8 miles southeast of
San Carlos, or 23 miles east of Globe, moving southwest at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
San Carlos Reservoir.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3321 11019 3298 11050 3310 11068 3314 11064
3313 11059 3316 11053 3318 11053 3320 11040
3328 11046 3339 11044 3335 11037 3329 11029
TIME...MOT...LOC 0357Z 042DEG 24KT 3327 11036
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JRM862
WWUS55 KTWC 160416
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
916 PM MST Sun Aug 15 2021
AZC009-021-160426-
/O.CAN.KTWC.SV.W.0140.000000T0000Z-210816T0430Z/
Graham-Pinal-
916 PM MST Sun Aug 15 2021
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL GRAHAM AND
EASTERN PINAL COUNTIES IS CANCELLED...
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 has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
LAT...LON 3321 11019 3298 11050 3310 11068 3314 11064
3313 11059 3316 11053 3318 11053 3320 11040
3328 11046 3339 11044 3335 11037 3329 11029
TIME...MOT...LOC 0414Z 052DEG 32KT 3316 11052
$$
JRMThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 7:02 PM MST | Special Weather Statement | TWC | Greenlee | 43 min |
| Aug 15, 7:47 PM MST | Special Weather Statement | TWC | Graham | 58 min |
| Aug 16, 12:20 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 55 min |
| Aug 16, 12:39 PM MST | Flash Flood Warning | TWC | Pinal | 3 hr |
| Aug 16, 1:27 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 48 min |
| Aug 16, 1:49 PM MST | Flash Flood Warning | TWC | Pinal | 3 hr |
| Aug 16, 3:06 PM MST | Areal Flood Advisory | TWC | Graham, Greenlee | 3 hr |
| Aug 16, 3:11 PM MST | Special Weather Statement | TWC | Santa Cruz | 34 min |
| Aug 16, 3:14 PM MST | Special Weather Statement | TWC | Graham | 46 min |
| Aug 16, 3:58 PM MST | Special Weather Statement | TWC | Graham | 47 min |
| Aug 16, 4:38 PM MST | Areal Flood Advisory | TWC | Graham, Greenlee | 3 hr |
| Aug 16, 4:44 PM MST | Severe Thunderstorm Warning | TWC | Graham | 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.