Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 96, NWS Tucson, AZ

July 30, 2021Santa Cruz County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 30, 2021, 3:07 PM MST for Santa Cruz County, Arizona. It was in force for 38 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 30, 2021, 3:07 PM MST (22:07 UTC)
Expired: Jul 30, 2021, 3:45 PM MST
In force: 38 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 75 km from the middle of the area, began a volume at 22:08 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 89 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: 196 J/kg
Mixed-layer CIN: -244 J/kg
Mixed-layer LCL: 1696 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

742 
WUUS55 KTWC 302207
SVRTWC
AZC023-302245-
/O.NEW.KTWC.SV.W.0096.210730T2207Z-210730T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
307 PM MST Fri Jul 30 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  Southwestern Santa Cruz County in southeastern Arizona...

* Until 345 PM MST.

* At 306 PM MST, a severe thunderstorm was located near Ruby, or 10 
  miles southeast of Arivaca, moving west at 15 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Ruby and Pena Blanca Lake. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3134 11110 3142 11136 3151 11136 3152 11109
      3133 11106
TIME...MOT...LOC 2206Z 084DEG 11KT 3144 11119 

HAIL...0.88IN
WIND...60MPH
 
$$

Meyer

1 follow-up statement

297 
WWUS55 KTWC 302235
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
335 PM MST Fri Jul 30 2021

AZC023-302245-
/O.EXP.KTWC.SV.W.0096.000000T0000Z-210730T2245Z/
Santa Cruz-
335 PM MST Fri Jul 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SANTA CRUZ COUNTY
WILL EXPIRE AT 345 PM MST...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However heavy rain is still possible with this
thunderstorm.

LAT...LON 3134 11110 3142 11136 3151 11136 3152 11109
      3133 11106
TIME...MOT...LOC 2235Z 084DEG 11KT 3143 11128 

$$

Meyer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 5:06 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham, Pima	39 min
Jul 29, 6:29 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 29, 6:33 PM MST	Areal Flood Advisory	TWC	Santa Cruz	117 min
Jul 29, 7:11 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 29, 7:53 PM MST	Areal Flood Advisory	TWC	Pima	112 min
Jul 30, 2:38 PM MST	Special Weather Statement	TWC	Santa Cruz	52 min
Jul 30, 3:31 PM MST	Areal Flood Advisory	TWC	Santa Cruz	3 hr
Jul 30, 4:11 PM MST	Areal Flood Advisory	TWC	Santa Cruz	2 hr

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.