Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 51, NWS Tucson, AZ

July 11, 2021Graham County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 11, 2021, 6:52 PM MST for Graham County, Arizona. It was in force for 38 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: Jul 11, 2021, 6:52 PM MST (01:52 UTC)
Expired: Jul 11, 2021, 7:30 PM MST
In force: 38 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 Phoenix radar (KIWA), 174 km from the middle of the area, began a volume at 01:54 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
Jul 11, 1:23 PM MST	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 1.9 hours before the alert went out and 176 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 727 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 3094 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

191 
WUUS55 KTWC 120152
SVRTWC
AZC009-120230-
/O.NEW.KTWC.SV.W.0051.210712T0152Z-210712T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
652 PM MST Sun Jul 11 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  North central Graham County in southeastern Arizona...

* Until 730 PM MST.

* At 652 PM MST, a severe thunderstorm was located 26 miles south of
  Seven Mile, or 40 miles northwest of Clifton, moving south at 10
  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...
  Point-Of-Pines.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3352 10982 3348 10981 3349 10980 3347 10978
      3350 10974 3348 10968 3322 10972 3332 11002
      3353 10986
TIME...MOT...LOC 0152Z 020DEG 10KT 3343 10979 

HAIL...1.00IN
WIND...60MPH
 
$$

AH

2 follow-up statements

764 
WWUS55 KTWC 120208
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
708 PM MST Sun Jul 11 2021

AZC009-120230-
/O.CON.KTWC.SV.W.0051.000000T0000Z-210712T0230Z/
Graham-
708 PM MST Sun Jul 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM MST
FOR NORTH CENTRAL GRAHAM COUNTY...

At 708 PM MST, a severe thunderstorm was located 28 miles south of
Seven Mile, or 38 miles north of Safford, moving south at 10 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...
Point-Of-Pines.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3345 10986 3341 10971 3322 10972 3332 11000
TIME...MOT...LOC 0208Z 020DEG 10KT 3339 10981 

HAIL...1.00IN
WIND...60MPH
 
$$

AH

432 
WWUS55 KTWC 120224
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
724 PM MST Sun Jul 11 2021

AZC009-120234-
/O.EXP.KTWC.SV.W.0051.000000T0000Z-210712T0230Z/
Graham-
724 PM MST Sun Jul 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL GRAHAM COUNTY
WILL EXPIRE AT 730 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 900 PM MST for
southeastern Arizona.

LAT...LON 3345 10986 3341 10971 3322 10972 3332 11000
TIME...MOT...LOC 0224Z 020DEG 10KT 3335 10983 

$$

AH

The office that day

Everything else NWS Tucson, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 11, 5:08 PM MST	Severe Thunderstorm Warning	TWC	Greenlee	37 min
Jul 11, 6:51 PM MST	Special Weather Statement	TWC	Cochise	39 min
Jul 11, 7:25 PM MST	Special Weather Statement	TWC	Cochise	50 min
Jul 11, 9:22 PM MST	Dust Storm Warning	TWC	Cochise, Graham, Greenlee	53 min
Jul 11, 9:59 PM MST	Dust Storm Warning	TWC	Cochise, Graham, Greenlee	61 min
Jul 11, 11:17 PM MST	Special Weather Statement	TWC	Cochise	28 min
Jul 12, 1:56 PM MST	Flash Flood Watch	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	4 days
Jul 12, 1:59 PM MST	Blowing Dust Advisory	TWC	Pima, Pinal	9 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2021 Every 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.