Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 98, NWS Tucson, AZ

July 30, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 30, 2021, 5:22 PM MST for Pima County, Arizona. It was in force for 29 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, 5:22 PM MST (00:22 UTC)
Expired: Jul 30, 2021, 5:51 PM MST
In force: 29 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Pima County, AZ

The radar

The Phoenix radar (KIWA), 114 km from the middle of the area, began a volume at 00:25 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

Phoenix, AZ (KPSR), launched 00:00Z, 0.4 hours before the alert went out and 118 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: 50 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 3059 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

524 
WUUS55 KTWC 310022
SVRTWC
AZC019-310115-
/O.NEW.KTWC.SV.W.0098.210731T0022Z-210731T0115Z/

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

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  North central Pima County in southeastern Arizona...

* Until 615 PM MST.

* At 521 PM MST, a severe thunderstorm was located 10 miles southeast
  of Kaka, or 37 miles east of Ajo, moving west at 5 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Ventana and Vaya Chin. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3229 11215 3231 11249 3250 11247 3250 11227
      3249 11211
TIME...MOT...LOC 0021Z 101DEG 5KT 3237 11223 

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

1 follow-up statement

117 
WWUS55 KTWC 310051
SVSTWC

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

AZC019-310100-
/O.CAN.KTWC.SV.W.0098.000000T0000Z-210731T0115Z/
Pima-
551 PM MST Fri Jul 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL PIMA COUNTY IS
CANCELLED...
                
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 has been cancelled.  However heavy rain is
still possible with this thunderstorm.

LAT...LON 3229 11215 3231 11249 3250 11247 3250 11227
      3249 11211
TIME...MOT...LOC 0042Z 101DEG 5KT 3238 11228 

$$

Zell

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 5:20 PM MST	Severe Thunderstorm Warning	TWC	Pima	55 min
Jul 30, 6:11 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 30, 6:33 PM MST	Special Weather Statement	TWC		42 min
Jul 30, 6:52 PM MST	Special Weather Statement	TWC		38 min
Jul 30, 7:10 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 30, 7:20 PM MST	Areal Flood Advisory	TWC	Pima	4 hr
Jul 30, 7:40 PM MST	Special Weather Statement	TWC		65 min
Jul 30, 7:49 PM MST	Severe Thunderstorm Warning	TWC	Pima	41 min
Jul 30, 7:51 PM MST	Areal Flood Advisory	TWC	Pima	114 min
Jul 30, 7:57 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 min
Jul 30, 7:59 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 30, 8:20 PM MST	Severe Thunderstorm Warning	TWC	Pima	40 min
Jul 30, 8:29 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 30, 8:35 PM MST	Areal Flood Advisory	TWC	Pima	115 min
Jul 30, 8:47 PM MST	Flash Flood Warning	TWC	Pima	118 min
Jul 30, 9:55 PM MST	Special Weather Statement	TWC	Pinal	65 min
Jul 30, 10:11 PM MST	Flash Flood Warning	TWC	Pima	4 hr
Jul 30, 11:37 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Jul 31, 2:06 AM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 31, 3:51 PM MST	Areal Flood Advisory	TWC	Pinal	114 min
Jul 31, 4:13 PM MST	Special Weather Statement	TWC		47 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.