Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 131, NWS Tucson, AZ

August 8, 2021Pima County, Santa Cruz County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 8, 2021, 8:45 PM MST for Pima County, Santa Cruz County, Arizona. It was in force for 45 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 8, 2021, 8:45 PM MST (03:45 UTC)
Expired: Aug 8, 2021, 9:30 PM MST
In force: 45 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Pima County, AZ, Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 43 km from the middle of the area, began a volume at 03:46 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, 3.8 hours before the alert went out and 42 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: 742 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 2449 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -60 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

303 
WUUS55 KTWC 090345
SVRTWC
AZC019-023-090430-
/O.NEW.KTWC.SV.W.0131.210809T0345Z-210809T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
845 PM MST Sun Aug 8 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  Southeastern Pima County in southeastern Arizona...
  North central Santa Cruz County in southeastern Arizona...

* Until 930 PM MST.

* At 845 PM MST, a severe thunderstorm was located over Green Valley,
  moving west at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Sahuarita, Green Valley, Amado and Arivaca Junction. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3192 11097 3176 11090 3163 11123 3189 11134
TIME...MOT...LOC 0345Z 068DEG 13KT 3182 11103 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RH

1 follow-up statement

112 
WWUS55 KTWC 090424
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
924 PM MST Sun Aug 8 2021

AZC019-023-090433-
/O.EXP.KTWC.SV.W.0131.000000T0000Z-210809T0430Z/
Pima-Santa Cruz-
924 PM MST Sun Aug 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PIMA AND NORTH
CENTRAL SANTA CRUZ COUNTIES WILL EXPIRE AT 930 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.

LAT...LON 3192 11097 3176 11090 3163 11123 3189 11134
TIME...MOT...LOC 0423Z 068DEG 13KT 3177 11117 

$$

RH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 5:03 PM MST	Special Weather Statement	TWC	Cochise	42 min
Aug 8, 5:18 PM MST	Special Weather Statement	TWC	Santa Cruz	27 min
Aug 8, 5:22 PM MST	Special Weather Statement	TWC	Pima	38 min
Aug 8, 5:22 PM MST	Severe Thunderstorm Warning	TWC	Cochise	38 min
Aug 8, 5:28 PM MST	Special Weather Statement	TWC	Cochise	47 min
Aug 8, 5:51 PM MST	Special Weather Statement	TWC	Pima	24 min
Aug 8, 6:09 PM MST	Severe Thunderstorm Warning	TWC	Cochise	66 min
Aug 8, 6:10 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Aug 8, 6:13 PM MST	Special Weather Statement	TWC	Pima	32 min
Aug 8, 6:14 PM MST	Severe Thunderstorm Warning	TWC	Cochise	20 min
Aug 8, 6:19 PM MST	Severe Thunderstorm Warning	TWC	Pima	41 min
Aug 8, 6:37 PM MST	Areal Flood Advisory	TWC	Cochise	5 hr
Aug 8, 6:46 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	5 hr
Aug 8, 6:56 PM MST	Dust Storm Advisory	TWC	Cochise, Pima, Pinal	70 min
Aug 8, 9:03 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	117 min
Aug 8, 9:28 PM MST	Areal Flood Advisory	TWC	Cochise, Pima, Santa Cruz	2 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.