Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 27, NWS Tucson, AZ

July 9, 2021Graham County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 9, 2021, 8:17 PM MST for Graham County, Arizona. It was in force for 43 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 9, 2021, 8:17 PM MST (03:17 UTC)
Expired: Jul 9, 2021, 9:00 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 Phoenix radar (KIWA), 125 km from the middle of the area, began a volume at 03:17 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, 3.3 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.

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: 902 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 3170 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

155 
WUUS55 KTWC 100317
SVRTWC
AZC009-100400-
/O.NEW.KTWC.SV.W.0027.210710T0317Z-210710T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
817 PM MST Fri Jul 9 2021

The National Weather Service in Tucson has issued a

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

* Until 900 PM MST.

* At 816 PM MST, a severe thunderstorm was located 10 miles east of
  San Carlos, or 26 miles east of Globe, moving southwest at 15 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...
  San Carlos Reservoir.

This includes Route 70 between mile markers 272 and 288.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3338 11015 3302 11024 3317 11044 3320 11040
      3328 11046 3338 11044 3340 11040 3340 11037
      3343 11034 3343 11029 3344 11028
TIME...MOT...LOC 0316Z 029DEG 13KT 3336 11029 

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

1 follow-up statement

099 
WWUS55 KTWC 100351
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
851 PM MST Fri Jul 9 2021

AZC009-100401-
/O.EXP.KTWC.SV.W.0027.000000T0000Z-210710T0400Z/
Graham-
851 PM MST Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL GRAHAM COUNTY
WILL EXPIRE AT 900 PM MST...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 3338 11015 3302 11024 3317 11044 3320 11040
      3328 11046 3338 11044 3340 11040 3340 11037
      3343 11034 3343 11029 3344 11028
TIME...MOT...LOC 0351Z 029DEG 13KT 3326 11036 

$$

The 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, 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, 4:32 PM MST	Severe Thunderstorm Warning	TWC	Graham	43 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, 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.