Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 186, NWS Tucson, AZ

September 5, 2021Graham County, Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Sep 5, 2021, 5:01 PM MST for Graham County, Pinal County, Arizona. It was in force for 59 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: Sep 5, 2021, 5:01 PM MST (00:01 UTC)
Expired: Sep 5, 2021, 6:00 PM MST
In force: 59 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Graham County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 91 km from the middle of the area, began a volume at 00:04 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

Phoenix, AZ (KPSR), launched 00:00Z, 0.0 hours before the alert went out and 123 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: 48 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 3562 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

588 
WUUS55 KTWC 060001
SVRTWC
AZC009-021-060100-
/O.NEW.KTWC.SV.W.0186.210906T0001Z-210906T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
501 PM MST Sun Sep 5 2021

The National Weather Service in Tucson has issued a

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

* Until 600 PM MST.

* At 501 PM MST, severe thunderstorms were located along a line
  extending from near Aravaipa Canyon Wilderness to near Dudleyville
  to near Kearny to 13 miles southeast of Superior, moving south 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...
  Mammoth, Kearny, Dudleyville, Aravaipa Canyon Wilderness, Kelvin
  and San Carlos Reservoir.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3319 11044 3261 11041 3269 11089 3286 11126
      3310 11111 3318 11104 3310 11086 3298 11078
      3303 11073 3307 11072 3309 11068 3311 11067
      3316 11053 3318 11053
TIME...MOT...LOC 0001Z 019DEG 17KT 3293 11046 3297 11068 3303 11088
3312 11099

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JRM

2 follow-up statements

768 
WWUS55 KTWC 060048
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
548 PM MST Sun Sep 5 2021

AZC009-021-060100-
/O.CON.KTWC.SV.W.0186.000000T0000Z-210906T0100Z/
Graham-Pinal-
548 PM MST Sun Sep 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MST
FOR WESTERN GRAHAM AND EAST CENTRAL PINAL COUNTIES...

At 547 PM MST, severe thunderstorms were located along a line
extending from near Aravaipa Canyon Wilderness to 7 miles south of
Dudleyville to 15 miles southwest of Winkelman to 13 miles southwest
of Kearny, moving south 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...
Mammoth, Dudleyville and Aravaipa Canyon Wilderness. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3291 11047 3261 11041 3269 11089 3286 11126
      3305 11111 3295 11086 3298 11078 3298 11073
TIME...MOT...LOC 0047Z 018DEG 16KT 3287 11054 3280 11075 3283 11096
3292 11107

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JRM

483 
WWUS55 KTWC 060055
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
555 PM MST Sun Sep 5 2021

AZC009-021-060105-
/O.EXP.KTWC.SV.W.0186.000000T0000Z-210906T0100Z/
Graham-Pinal-
555 PM MST Sun Sep 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN GRAHAM AND EAST
CENTRAL PINAL COUNTIES WILL EXPIRE AT 600 PM MST...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However gusty 
winds and heavy rain are still possible with these thunderstorms.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Tucson.

LAT...LON 3291 11047 3261 11041 3269 11089 3286 11126
      3305 11111 3295 11086 3298 11078 3298 11073
TIME...MOT...LOC 0055Z 019DEG 17KT 3284 11055 3277 11076 3280 11097
3289 11108

$$

JRM

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 5:09 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	111 min
Sep 5, 5:18 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham, Pima	42 min
Sep 5, 5:37 PM MST	Dust Storm Advisory	TWC	Pima, Pinal	95 min
Sep 5, 5:41 PM MST	Flash Flood Warning	TWC	Pinal	2 hr
Sep 5, 5:58 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	47 min
Sep 5, 6:02 PM MST	Special Weather Statement	TWC		43 min
Sep 5, 6:39 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	2 hr
Sep 5, 7:05 PM MST	Special Weather Statement	TWC	Pima	40 min
Sep 5, 10:09 PM MST	Areal Flood Advisory	TWC	Pima	3 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.