Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 105, NWS Tucson, AZ

August 2, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 2, 2021, 8:13 PM MST for Pima County, Arizona. It was in force for 33 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 2, 2021, 8:13 PM MST (03:13 UTC)
Expired
Aug 2, 2021, 8:46 PM MST
In force
33 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

County Pima County, AZ

The radar

The Tucson radar (KEMX), 26 km from the middle of the area, began a volume at 03:16 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, 3.2 hours before the alert went out and 16 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-pSkew-T log-p diagram, Tuscon, AZ at 00:00Z on 2021-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1093 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 00:00Z on 2021-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -18 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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.

302 
WUUS55 KTWC 030313
SVRTWC
AZC019-030400-
/O.NEW.KTWC.SV.W.0105.210803T0313Z-210803T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
813 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 900 PM MST.

* At 812 PM MST, a severe thunderstorm was located near East Tucson 
  down to Rita Ranch. Vail, moving south at 15 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Tucson, Davis-Monthan Air Force Base, Tanque Verde, Vail, East
  Sahuarita, Corona De Tucson, Saguaro National Park East and Rita
  Ranch.

This includes the following highways...
 Interstate 10 between mile markers 269 and 288.
 Route 83 between mile markers 51 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 3228 11080 3215 11061 3188 11056 3196 11093
TIME...MOT...LOC 0312Z 006DEG 12KT 3210 11074 

HAIL...<.75IN
WIND...70MPH
 
$$

Meyer
2 follow-up statements
129 
WWUS55 KTWC 030335
SVSTWC

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

AZC019-030400-
/O.CON.KTWC.SV.W.0105.000000T0000Z-210803T0400Z/
Pima-
835 PM MST Mon Aug 2 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MST
FOR EAST CENTRAL PIMA COUNTY...

At 832 PM MST, the severe thunderstorm that moved through portions 
of east Tucson is weakening. Now near Vail and southeast Tucson, it 
continues to push to the south at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Vail, East Sahuarita, Corona De Tucson, Saguaro National Park East 
and Rita Ranch.

This includes the following highways...
 Interstate 10 between mile markers 269 and 288.
 Route 83 between mile markers 51 and 58.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3228 11080 3215 11061 3188 11056 3196 11093
TIME...MOT...LOC 0332Z 006DEG 12KT 3203 11075 

HAIL...<.75IN
WIND...60MPH
 
$$

Meyer
289 
WWUS55 KTWC 030346
SVSTWC

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

AZC019-030355-
/O.CAN.KTWC.SV.W.0105.000000T0000Z-210803T0400Z/
Pima-
846 PM MST Mon Aug 2 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PIMA COUNTY IS
CANCELLED...
                
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 has been cancelled.  However gusty winds to 
40 mph and heavy rain are still possible with this thunderstorm.

LAT...LON 3228 11080 3215 11061 3188 11056 3196 11093
TIME...MOT...LOC 0336Z 006DEG 12KT 3198 11076 

$$

Meyer

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 5:15 PM MSTSpecial Weather StatementTWCSanta Cruz30 min
Aug 2, 5:19 PM MSTDust Storm AdvisoryTWCCochise41 min
Aug 2, 5:33 PM MSTSpecial Weather StatementTWC42 min
Aug 2, 5:48 PM MSTSpecial Weather StatementTWC42 min
Aug 2, 5:51 PM MSTAreal Flood AdvisoryTWCPima114 min
Aug 2, 5:58 PM MSTFlash Flood Warning Considerable damage threatTWCPima3 hr
Aug 2, 6:24 PM MSTAreal Flood AdvisoryTWCPima2 hr
Aug 2, 6:26 PM MSTAreal Flood AdvisoryTWCCochise, Santa Cruz2 hr
Aug 2, 6:31 PM MSTSpecial Weather StatementTWC59 min
Aug 2, 6:37 PM MSTSevere Thunderstorm WarningTWCPima38 min
Aug 2, 6:55 PM MSTFlash Flood Warning Considerable damage threatTWCPima3 hr
Aug 2, 7:06 PM MSTAreal Flood AdvisoryTWCPinal114 min
Aug 2, 7:06 PM MSTSpecial Weather StatementTWCCochise39 min
Aug 2, 7:15 PM MSTSpecial Weather StatementTWCSanta Cruz45 min
Aug 2, 7:25 PM MSTSpecial Weather StatementTWC50 min
Aug 2, 7:31 PM MSTSevere Thunderstorm WarningTWCPima44 min
Aug 2, 8:14 PM MSTFlash Flood Warning Considerable damage threatTWCPima3 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2021Every 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.