Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 154, NWS Tucson, AZ

August 23, 2021Graham County, Greenlee County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 23, 2021, 4:37 PM MST for Graham County, Greenlee 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: Aug 23, 2021, 4:37 PM MST (23:37 UTC)
Expired: Aug 23, 2021, 5:15 PM MST
In force: 38 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Graham County, AZ, Greenlee County, AZ

The radar

The Tucson radar (KEMX), 150 km from the middle of the area, began a volume at 23:40 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 12:00Z, 11.6 hours before the alert went out and 155 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2559 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

817 
WUUS55 KTWC 232337
SVRTWC
AZC009-011-240015-
/O.NEW.KTWC.SV.W.0154.210823T2337Z-210824T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
437 PM MST Mon Aug 23 2021

The National Weather Service in Tucson has issued a

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

* Until 515 PM MST.

* At 437 PM MST, a severe thunderstorm was located 12 miles southeast
  of Solomon, or 17 miles southeast of Safford, moving northeast 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.

* This severe thunderstorm will remain over mainly remote areas of
  southeastern Graham and west central Greenlee Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3260 10940 3270 10959 3297 10943 3284 10915
TIME...MOT...LOC 2337Z 217DEG 14KT 3273 10944 

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

$$

AH

2 follow-up statements

926 
WWUS55 KTWC 232355
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
455 PM MST Mon Aug 23 2021

AZC009-011-240015-
/O.CON.KTWC.SV.W.0154.000000T0000Z-210824T0015Z/
Graham-Greenlee-
455 PM MST Mon Aug 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MST
FOR SOUTHEASTERN GRAHAM AND WEST CENTRAL GREENLEE COUNTIES...

At 455 PM MST, a severe thunderstorm was located 14 miles east of
Solomon, or 17 miles south of Clifton, moving northeast 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.

This severe thunderstorm will remain over mainly remote areas of
southeastern Graham and west central Greenlee Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3260 10940 3270 10959 3297 10943 3284 10915
TIME...MOT...LOC 2355Z 217DEG 14KT 3279 10939 

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

$$

AH

255 
WWUS55 KTWC 240009
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
509 PM MST Mon Aug 23 2021

AZC009-011-240019-
/O.EXP.KTWC.SV.W.0154.000000T0000Z-210824T0015Z/
Graham-Greenlee-
509 PM MST Mon Aug 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GRAHAM AND WEST
CENTRAL GREENLEE COUNTIES WILL EXPIRE AT 515 PM MST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 3260 10940 3270 10959 3297 10943 3284 10915
TIME...MOT...LOC 0009Z 217DEG 14KT 3282 10936 

$$

AH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 6:24 PM MST	Special Weather Statement	TWC	Cochise	36 min
Aug 23, 12:11 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Aug 23, 12:42 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Aug 23, 1:12 PM MST	Special Weather Statement	TWC	Cochise	48 min
Aug 23, 1:26 PM MST	Special Weather Statement	TWC	Cochise	49 min
Aug 23, 1:28 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Aug 23, 1:42 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Aug 23, 1:50 PM MST	Severe Thunderstorm Warning	TWC	Cochise	40 min
Aug 23, 1:54 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Aug 23, 2:09 PM MST	Excessive Heat Watch	TWC	Pima, Pinal	24 hr
Aug 23, 2:13 PM MST	Special Weather Statement	TWC	Cochise	47 min
Aug 23, 2:22 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Aug 23, 2:37 PM MST	Special Weather Statement	TWC	Cochise	38 min
Aug 23, 2:43 PM MST	Severe Thunderstorm Warning	TWC	Cochise	24 min
Aug 23, 3:00 PM MST	Special Weather Statement	TWC	Cochise	45 min
Aug 23, 3:32 PM MST	Areal Flood Advisory	TWC	Cochise	118 min
Aug 23, 4:03 PM MST	Special Weather Statement	TWC	Graham	42 min
Aug 23, 4:59 PM MST	Flash Flood Warning Considerable damage threat	TWC	Graham	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.