Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 143, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 16, 2021, 4:44 PM MST for Graham 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 16, 2021, 4:44 PM MST (23:44 UTC)
- Expired
- Aug 16, 2021, 5:30 PM MST
- In force
- 46 min
- Issued by
- NWS Tucson, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Graham County, AZ
The radar
The Tucson radar (KEMX), 137 km from the middle of the area, began a volume at 23:47 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 16, 3:54 PM MST | Severe Thunderstorm Watch | SPC | 10 hr |
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 11.7 hours before the alert went out and 144 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
- 1291 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1297 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- -3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
052
WUUS55 KTWC 162344
SVRTWC
AZC009-170030-
/O.NEW.KTWC.SV.W.0143.210816T2344Z-210817T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
444 PM MST Mon Aug 16 2021
The National Weather Service in Tucson has issued a
* Severe Thunderstorm Warning for...
Southeastern Graham County in southeastern Arizona...
* Until 530 PM MST.
* At 444 PM MST, a severe thunderstorm was located 14 miles southeast
of Solomon, or 18 miles southeast of Safford, 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.
* This severe thunderstorm will remain over mainly remote areas of
southeastern Graham County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3279 10953 3276 10932 3243 10928 3246 10973
TIME...MOT...LOC 2344Z 006DEG 4KT 3269 10944
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
AH2 follow-up statements
468
WWUS55 KTWC 170009
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
509 PM MST Mon Aug 16 2021
AZC009-170030-
/O.CON.KTWC.SV.W.0143.000000T0000Z-210817T0030Z/
Graham-
509 PM MST Mon Aug 16 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MST
FOR SOUTHEASTERN GRAHAM COUNTY...
At 508 PM MST, a severe thunderstorm was located 14 miles southeast
of Solomon, or 19 miles southeast of Safford, and is nearly
stationary.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe thunderstorm will remain over mainly remote areas of
southeastern Graham County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3279 10953 3276 10932 3243 10928 3246 10970
TIME...MOT...LOC 0008Z 006DEG 4KT 3266 10944
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
AH590
WWUS55 KTWC 170025
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
525 PM MST Mon Aug 16 2021
AZC009-170035-
/O.EXP.KTWC.SV.W.0143.000000T0000Z-210817T0030Z/
Graham-
525 PM MST Mon Aug 16 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GRAHAM COUNTY
WILL EXPIRE AT 530 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.
A Severe Thunderstorm Watch remains in effect until midnight MST for
southeastern Arizona.
LAT...LON 3279 10953 3276 10932 3243 10928 3246 10970
TIME...MOT...LOC 0025Z 006DEG 4KT 3264 10944
$$
AHThe 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 15, 8:30 PM MST | Severe Thunderstorm Warning | TWC | Graham, Pinal | 46 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 |
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.