Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 78, NWS Tucson, AZ

July 20, 2021Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 20, 2021, 8:02 PM MST for Pinal County, Arizona. It was in force for 58 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, 8:02 PM MST (03:02 UTC)
Expired: Jul 20, 2021, 9:00 PM MST
In force: 58 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 Tucson radar (KEMX), 82 km from the middle of the area, began a volume at 03:04 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, 3.0 hours before the alert went out and 53 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.

841 
WUUS55 KTWC 210302
SVRTWC
AZC021-210400-
/O.NEW.KTWC.SV.W.0078.210721T0302Z-210721T0400Z/

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

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  Southeastern Pinal County in southeastern Arizona...

* Until 900 PM MST.

* At 801 PM MST, a severe thunderstorm was located near Oracle,
  moving west at 15 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Oracle, Saddlebrooke, San Manuel, Campo Bonito, Biosphere 2 and
  Oracle Junction.

This includes the following highways...
 Route 77 between mile markers 89 and 112.
 Route 79 near mile marker 92.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3270 11062 3252 11062 3252 11096 3269 11093
TIME...MOT...LOC 0301Z 090DEG 14KT 3262 11072 

HAIL...0.75IN
WIND...60MPH
 
$$

Meyer

2 follow-up statements

367 
WWUS55 KTWC 210321
SVSTWC

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

AZC021-210400-
/O.CON.KTWC.SV.W.0078.000000T0000Z-210721T0400Z/
Pinal-
821 PM MST Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MST
FOR SOUTHEASTERN PINAL COUNTY...

At 821 PM MST, a severe thunderstorm was located between Oracle and 
Campo Bonito, moving west at 15 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Oracle, Saddlebrooke, San Manuel, Campo Bonito, Biosphere 2 and
Oracle Junction.

This includes the following highways...
 Route 77 between mile markers 89 and 112.
 Route 79 near mile marker 92.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3270 11062 3252 11062 3252 11096 3269 11093
TIME...MOT...LOC 0321Z 083DEG 13KT 3259 11079 

HAIL...0.75IN
WIND...60MPH
 
$$

Meyer

921 
WWUS55 KTWC 210354
SVSTWC

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

AZC021-210403-
/O.EXP.KTWC.SV.W.0078.000000T0000Z-210721T0400Z/
Pinal-
854 PM MST Tue Jul 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PINAL COUNTY WILL
EXPIRE AT 900 PM MST...
                
The storm which prompted the warning near Oracle 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 
heavy rain is still possible with this thunderstorm.

LAT...LON 3270 11062 3252 11062 3252 11096 3269 11093
TIME...MOT...LOC 0353Z 090DEG 14KT 3259 11091 

$$

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, 8:14 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 20, 9:53 PM MST	Severe Thunderstorm Warning	TWC	Pinal	52 min
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.