Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 103, NWS Tucson, AZ

August 2, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 2, 2021, 6:37 PM MST for Pima County, Arizona. It was in force for 38 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 2, 2021, 6:37 PM MST (01:37 UTC)
Expired: Aug 2, 2021, 7:15 PM MST
In force: 38 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Pima County, AZ

The radar

The Tucson radar (KEMX), 5 km from the middle of the area, began a volume at 01:37 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.

What was reported inside it

Time	Report	Where	Remark
Aug 2, 6:42 PM MST	TSTM WND GST 77	20 Wsw Benson, AZ	MEASURED WIND GUST FROM PIMA COUNTY WEATHER STATION ON KEMX RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 1.6 hours before the alert went out and 36 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: 1093 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 2632 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

425 
WUUS55 KTWC 030137
SVRTWC
AZC019-030215-
/O.NEW.KTWC.SV.W.0103.210803T0137Z-210803T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
637 PM MST Mon Aug 2 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  East central Pima County in southeastern Arizona...

* Until 715 PM MST.

* At 636 PM MST, a severe thunderstorm was located near Vail, or 18
  miles west of Benson, moving southwest 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...
  Vail.

This includes the following highways...
 Interstate 10 between mile markers 282 and 293.
 Route 83 between mile markers 43 and 58.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3204 11068 3201 11050 3175 11050 3183 11081
TIME...MOT...LOC 0136Z 030DEG 9KT 3195 11063 

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

AH

2 follow-up statements

563 
WWUS55 KTWC 030155
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
655 PM MST Mon Aug 2 2021

AZC019-030215-
/O.CON.KTWC.SV.W.0103.000000T0000Z-210803T0215Z/
Pima-
655 PM MST Mon Aug 2 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MST
FOR EAST CENTRAL PIMA COUNTY...

At 655 PM MST, a severe thunderstorm was located 7 miles south of
Vail, or 18 miles east of Sahuarita, moving southwest 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...
Vail.

This includes the following highways...
 Interstate 10 between mile markers 283 and 293.
 Route 83 between mile markers 43 and 57.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3201 11068 3199 11050 3175 11050 3183 11081
TIME...MOT...LOC 0155Z 030DEG 9KT 3191 11066 

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

AH

444 
WWUS55 KTWC 030211
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
711 PM MST Mon Aug 2 2021

AZC019-030221-
/O.EXP.KTWC.SV.W.0103.000000T0000Z-210803T0215Z/
Pima-
711 PM MST Mon Aug 2 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PIMA COUNTY WILL
EXPIRE AT 715 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.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3201 11068 3199 11050 3175 11050 3183 11081
TIME...MOT...LOC 0211Z 030DEG 9KT 3188 11068 

$$

AH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 5:15 PM MST	Special Weather Statement	TWC	Santa Cruz	30 min
Aug 2, 5:19 PM MST	Dust Storm Advisory	TWC	Cochise	41 min
Aug 2, 5:33 PM MST	Special Weather Statement	TWC		42 min
Aug 2, 5:48 PM MST	Special Weather Statement	TWC		42 min
Aug 2, 5:51 PM MST	Areal Flood Advisory	TWC	Pima	114 min
Aug 2, 5:58 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Aug 2, 6:24 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Aug 2, 6:26 PM MST	Areal Flood Advisory	TWC	Cochise, Santa Cruz	2 hr
Aug 2, 6:31 PM MST	Special Weather Statement	TWC		59 min
Aug 2, 6:55 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Aug 2, 7:06 PM MST	Areal Flood Advisory	TWC	Pinal	114 min
Aug 2, 7:06 PM MST	Special Weather Statement	TWC	Cochise	39 min
Aug 2, 7:15 PM MST	Special Weather Statement	TWC	Santa Cruz	45 min
Aug 2, 7:25 PM MST	Special Weather Statement	TWC		50 min
Aug 2, 7:31 PM MST	Severe Thunderstorm Warning	TWC	Pima	44 min
Aug 2, 8:13 PM MST	Severe Thunderstorm Warning	TWC	Pima	33 min
Aug 2, 8:14 PM MST	Flash Flood Warning Considerable damage threat	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.