Alert archive / Arizona / Tornado Warnings in 2021

Tornado Warning 4, NWS Tucson, AZ

August 6, 2021Pima County, Arizona

NWS Tucson, AZ issued this tornado warning at Aug 6, 2021, 6:19 PM MST for Pima County, Arizona. It was in force for 26 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 6, 2021, 6:19 PM MST (01:19 UTC)
Expired
Aug 6, 2021, 6:45 PM MST
In force
26 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.5 in

County Pima County, AZ

The radar

The Phoenix radar (KIWA), 126 km from the middle of the area, began a volume at 01:22 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, 1.3 hours before the alert went out and 115 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 2021-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1326 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 2021-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -28 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
1326 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
2589 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-28 m²/s²
0-3 km storm-relative helicity
-6 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

561 
WFUS55 KTWC 070119
TORTWC
AZC019-070145-
/O.NEW.KTWC.TO.W.0004.210807T0119Z-210807T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Tucson AZ
619 PM MST Fri Aug 6 2021

The National Weather Service in Tucson has issued a

* Tornado Warning for...
  North central Pima County in southeastern Arizona...

* Until 645 PM MST.
    
* At 618 PM MST, a severe thunderstorm capable of producing a tornado
  was located near Santa Rosa, or 28 miles northwest of Sells, moving
  northeast at 55 mph.

  HAZARD...Tornado and ping pong ball size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly remote areas of
  north central Pima County, including the following locations...
  Covered Wells and Mountain Village.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3211 11212 3227 11228 3239 11212 3223 11194
TIME...MOT...LOC 0118Z 229DEG 46KT 3228 11211 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.50 IN

$$

Singer
1 follow-up statement
208 
WWUS55 KTWC 070136
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
636 PM MST Fri Aug 6 2021

AZC019-070145-
/O.CON.KTWC.TO.W.0004.000000T0000Z-210807T0145Z/
Pima-
636 PM MST Fri Aug 6 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM MST FOR NORTH
CENTRAL PIMA COUNTY...
    
At 636 PM MST, a severe thunderstorm capable of producing a tornado
was located 11 miles northeast of Santa Rosa, or 33 miles south of
Casa Grande, moving northeast at 55 mph.

HAZARD...Tornado and ping pong ball size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Santa Rosa, Covered Wells and Mountain Village. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3211 11212 3227 11228 3239 11212 3223 11194
TIME...MOT...LOC 0136Z 229DEG 46KT 3244 11190 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.50 IN

$$

Singer

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 5:01 PM MSTSevere Thunderstorm WarningTWCPima44 min
Aug 6, 5:02 PM MSTSpecial Weather StatementTWCPima43 min
Aug 6, 5:14 PM MSTSpecial Weather StatementTWCGreenlee46 min
Aug 6, 5:18 PM MSTSevere Thunderstorm WarningTWCPima42 min
Aug 6, 5:27 PM MSTAreal Flood AdvisoryTWCPima2 hr
Aug 6, 5:28 PM MSTAreal Flood AdvisoryTWCPima2 hr
Aug 6, 5:29 PM MSTSevere Thunderstorm WarningTWCPima, Pinal46 min
Aug 6, 5:40 PM MSTAreal Flood AdvisoryTWCPima3 hr
Aug 6, 5:50 PM MSTSpecial Weather StatementTWCGraham25 min
Aug 6, 6:00 PM MSTFlash Flood Warning Considerable damage threatTWCPima3 hr
Aug 6, 6:02 PM MSTSevere Thunderstorm WarningTWCPima, Pinal58 min
Aug 6, 6:23 PM MSTFlash Flood Warning Considerable damage threatTWCPima, Pinal4 hr
Aug 6, 7:02 PM MSTSpecial Weather StatementTWC43 min
Aug 6, 9:25 PM MSTAreal Flood WarningTWCPima3 hr
Aug 7, 12:54 PM MSTSevere Thunderstorm WarningTWCCochise51 min
Aug 7, 1:41 PM MSTSevere Thunderstorm WarningTWCCochise49 min
Aug 7, 2:47 PM MSTSpecial Weather StatementTWCCochise28 min
Aug 7, 2:55 PM MSTSevere Thunderstorm WarningTWCCochise34 min
Aug 7, 3:09 PM MSTAreal Flood AdvisoryTWCCochise111 min
Aug 7, 3:17 PM MSTSevere Thunderstorm WarningTWCCochise43 min
Aug 7, 3:25 PM MSTSpecial Weather StatementTWCGreenlee50 min
Aug 7, 3:53 PM MSTSpecial Weather StatementTWC52 min
Aug 7, 4:51 PM MSTSpecial Weather StatementTWCPima39 min
Aug 7, 4:57 PM MSTSpecial Weather StatementTWCCochise48 min

Nearby

Tornado Warnings in Arizona, 2021Every tornado warning in 2021Tornadoes 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.