Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 82, NWS Tucson, AZ

July 20, 2021Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 20, 2021, 9:53 PM MST for Pinal County, Arizona. It was in force for 52 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: Jul 20, 2021, 9:53 PM MST (04:53 UTC)
Expired: Jul 20, 2021, 10:45 PM MST
In force: 52 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 82 km from the middle of the area, began a volume at 04:52 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, 4.9 hours before the alert went out and 62 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: 712 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 2745 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

248 
WUUS55 KTWC 210453
SVRTWC
AZC021-210545-
/O.NEW.KTWC.SV.W.0082.210721T0453Z-210721T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
953 PM MST Tue Jul 20 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  South central Pinal County in southeastern Arizona...

* Until 1045 PM MST.

* At 952 PM MST, a severe thunderstorm was located 11 miles north of
  Marana, moving west at 15 to 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Eloy, Picacho, Picacho Peak State Park and Red Rock. 

This includes the following highways...
 Interstate 10 between mile markers 209 and 231.
 Route 87 between mile markers 116 and 119.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with this storm and possible dense blowing dust will 
occur before any rain or lightning. Do not wait for the sound of 
thunder before taking cover. SEEK SHELTER IMMEDIATELY inside a 
sturdy structure and stay away from windows.

&&

LAT...LON 3264 11110 3252 11110 3251 11162 3279 11154
TIME...MOT...LOC 0452Z 099DEG 17KT 3257 11122 

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

Meyer

2 follow-up statements

387 
WWUS55 KTWC 210515
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
1015 PM MST Tue Jul 20 2021

AZC021-210545-
/O.CON.KTWC.SV.W.0082.000000T0000Z-210721T0545Z/
Pinal-
1015 PM MST Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM MST
FOR SOUTH CENTRAL PINAL COUNTY...

At 1013 PM MST, a severe thunderstorm was located near Picacho Peak 
State Park, or 20 miles northwest of Marana, moving northwest at 15 
to 20 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...
Eloy, Picacho, Picacho Peak State Park and Red Rock. 

This includes the following highways...
 Interstate 10 between mile markers 209 and 231.
 Route 87 between mile markers 116 and 119.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with this storm and possible dense blowing dust will 
occur before any rain or lightning. Do not wait for the sound of 
thunder before taking cover. SEEK SHELTER IMMEDIATELY inside a 
sturdy structure and stay away from windows.

&&

LAT...LON 3264 11110 3252 11110 3251 11162 3279 11154
TIME...MOT...LOC 0513Z 107DEG 18KT 3264 11136 

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

Meyer

855 
WWUS55 KTWC 210543
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
1043 PM MST Tue Jul 20 2021

AZC021-210550-
/O.EXP.KTWC.SV.W.0082.000000T0000Z-210721T0545Z/
Pinal-
1043 PM MST Tue Jul 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PINAL COUNTY
WILL EXPIRE AT 1045 PM MST...
                
The storm which prompted the warning is now near I-10 and Picacho, 
and has weakened below severe limits. Therefore, the warning will be 
allowed to expire.

LAT...LON 3264 11110 3252 11110 3251 11162 3279 11154
TIME...MOT...LOC 0540Z 099DEG 17KT 3265 11145 

$$

Meyer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 6:00 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 20, 6:44 PM MST	Special Weather Statement	TWC		46 min
Jul 20, 7:17 PM MST	Special Weather Statement	TWC	Santa Cruz	43 min
Jul 20, 8:02 PM MST	Severe Thunderstorm Warning	TWC	Pinal	58 min
Jul 20, 8:14 PM MST	Special Weather Statement	TWC		61 min
Jul 20, 8:17 PM MST	Severe Thunderstorm Warning	TWC	Pima	58 min
Jul 20, 8:40 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 20, 8:46 PM MST	Severe Thunderstorm Warning	TWC	Pima	30 min
Jul 20, 9:13 PM MST	Special Weather Statement	TWC		62 min
Jul 20, 9:24 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	51 min
Jul 20, 9:42 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	2 hr
Jul 21, 1:50 AM MST	Flash Flood Watch	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	5 days
Jul 21, 8:18 AM MST	Blowing Dust Advisory	TWC	Pima, Pinal	8 hr
Jul 21, 1:00 PM MST	Special Weather Statement	TWC	Pima	45 min
Jul 21, 1:12 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 min
Jul 21, 1:38 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 21, 1:57 PM MST	Special Weather Statement	TWC	Pima	48 min
Jul 21, 2:09 PM MST	Special Weather Statement	TWC	Pima	51 min
Jul 21, 2:16 PM MST	Severe Thunderstorm Warning	TWC	Pima	44 min
Jul 21, 2:21 PM MST	Dust Storm Advisory	TWC	Pima, Pinal	84 min
Jul 21, 2:51 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 21, 3:01 PM MST	Dust Storm Warning	TWC	Pinal	32 min

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.