Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 20, NWS Tucson, AZ

July 4, 2021Pima County, Santa Cruz County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 4, 2021, 3:08 PM MST for Pima County, Santa Cruz 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 4, 2021, 3:08 PM MST (22:08 UTC)
Expired: Jul 4, 2021, 4:00 PM MST
In force: 52 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Pima County, AZ, Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 76 km from the middle of the area, began a volume at 22:10 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 12:00Z, 10.1 hours before the alert went out and 75 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: 550 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

818 
WUUS55 KTWC 042208
SVRTWC
AZC019-023-042300-
/O.NEW.KTWC.SV.W.0020.210704T2208Z-210704T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
308 PM MST Sun Jul 4 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  South central Pima County in southeastern Arizona...
  West central Santa Cruz County in southeastern Arizona...

* Until 400 PM MST.

* At 308 PM MST, a severe thunderstorm was located near Arivaca, 
  moving southeast at 5 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...
  Arivaca and Arivaca Lake. 

This includes Route 286 between mile markers 13 and 14.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3167 11151 3177 11133 3159 11113 3144 11140
TIME...MOT...LOC 2208Z 327DEG 6KT 3167 11138 

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

Carpenter

2 follow-up statements

887 
WWUS55 KTWC 042238
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
338 PM MST Sun Jul 4 2021

AZC019-023-042300-
/O.CON.KTWC.SV.W.0020.000000T0000Z-210704T2300Z/
Pima-Santa Cruz-
338 PM MST Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM MST
FOR SOUTH CENTRAL PIMA AND WEST CENTRAL SANTA CRUZ COUNTIES...

At 337 PM MST, a severe thunderstorm was located near Arivaca, 
moving southeast at 5 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Arivaca and Arivaca Lake. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3160 11143 3173 11132 3159 11113 3144 11140
TIME...MOT...LOC 2237Z 327DEG 6KT 3163 11135 

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

Carpenter

640 
WWUS55 KTWC 042256
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
356 PM MST Sun Jul 4 2021

AZC019-023-042306-
/O.EXP.KTWC.SV.W.0020.000000T0000Z-210704T2300Z/
Pima-Santa Cruz-
356 PM MST Sun Jul 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PIMA AND WEST
CENTRAL SANTA CRUZ COUNTIES WILL EXPIRE AT 400 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 heavy rain
is still possible with this thunderstorm.

LAT...LON 3160 11143 3173 11132 3159 11113 3144 11140
TIME...MOT...LOC 2256Z 327DEG 6KT 3161 11134 

$$

Carpenter

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 11:35 AM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 4, 11:41 AM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 4, 12:03 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 4, 12:33 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 4, 1:02 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 4, 1:17 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 4, 2:20 PM MST	Areal Flood Advisory	TWC	Santa Cruz	3 hr
Jul 4, 2:39 PM MST	Special Weather Statement	TWC	Santa Cruz	51 min
Jul 4, 3:44 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 4, 4:01 PM MST	Special Weather Statement	TWC	Santa Cruz	44 min
Jul 4, 4:25 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 4, 4:36 PM MST	Special Weather Statement	TWC	Graham	24 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.