Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 31, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 10, 2021, 4:32 PM MST for Graham County, Arizona. It was in force for 43 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 10, 2021, 4:32 PM MST (23:32 UTC)
- Expired
- Jul 10, 2021, 5:15 PM MST
- In force
- 43 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), 140 km from the middle of the area, began a volume at 23:33 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 10, 4:56 PM MST | TSTM WND DMG | 1 Wnw Safford, AZ | TREES DOWN AND UTILITY POLES DOWN IN SAFFORD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 11.5 hours before the alert went out and 139 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
- 1505 J/kg
- Mixed-layer CIN
- -302 J/kg
- Mixed-layer LCL
- 1767 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
982
WUUS55 KTWC 102332
SVRTWC
AZC009-110015-
/O.NEW.KTWC.SV.W.0031.210710T2332Z-210711T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
432 PM MST Sat Jul 10 2021
The National Weather Service in Tucson has issued a
* Severe Thunderstorm Warning for...
Southeastern Graham County in southeastern Arizona...
* Until 515 PM MST.
* At 431 PM MST, a severe thunderstorm was located over Safford
Regional Airport, or near Safford, moving west 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...
Safford, Thatcher, Solomon, Roper Lake State Park, Safford Regional
Airport, Pima, Central, Swift Trail Junction, Mount Graham and Frye
Mesa Dam.
This includes the following highways...
Route 70 between mile markers 331 and 357.
Route 191 between mile markers 109 and 138.
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 3299 10947 3274 10941 3261 10987 3286 10999
TIME...MOT...LOC 2331Z 068DEG 16KT 3285 10961
HAIL...1.00IN
WIND...60MPH
$$
GL1 follow-up statement
845
WWUS55 KTWC 102355
SVSTWC
Severe Weather Statement
National Weather Service Tucson AZ
455 PM MST Sat Jul 10 2021
AZC009-110015-
/O.CON.KTWC.SV.W.0031.000000T0000Z-210711T0015Z/
Graham-
455 PM MST Sat Jul 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MST
FOR SOUTHEASTERN GRAHAM COUNTY...
At 455 PM MST, a severe thunderstorm was located over Safford, moving
west at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Safford, Thatcher, Solomon, Roper Lake State Park, Safford Regional
Airport, Pima, Central, Swift Trail Junction, Mount Graham and Frye
Mesa Dam.
This includes the following highways...
Route 70 between mile markers 331 and 357.
Route 191 between mile markers 109 and 138.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3299 10947 3274 10941 3261 10987 3286 10999
TIME...MOT...LOC 2355Z 068DEG 16KT 3281 10973
HAIL...1.00IN
WIND...60MPH
$$
GLThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 5:11 PM MST | Special Weather Statement | TWC | 49 min | |
| Jul 9, 6:09 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 26 min |
| Jul 9, 7:54 PM MST | Special Weather Statement | TWC | Graham | 36 min |
| Jul 9, 8:17 PM MST | Severe Thunderstorm Warning | TWC | Graham | 43 min |
| Jul 9, 10:16 PM MST | Special Weather Statement | TWC | Pinal | 29 min |
| Jul 9, 10:55 PM MST | Special Weather Statement | TWC | Pima | 35 min |
| Jul 10, 1:55 PM MST | Blowing Dust Advisory | TWC | Pima, Pinal | 9 hr |
| Jul 10, 3:09 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 51 min |
| Jul 10, 3:18 PM MST | Special Weather Statement | TWC | Greenlee | 42 min |
| Jul 10, 3:40 PM MST | Special Weather Statement | TWC | 35 min | |
| Jul 10, 3:43 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 19 min |
| Jul 10, 4:03 PM MST | Special Weather Statement | TWC | Graham | 42 min |
| Jul 10, 4:27 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 48 min |
| Jul 10, 4:39 PM MST | Special Weather Statement | TWC | Santa Cruz | 51 min |
| Jul 10, 4:45 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 45 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.