Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 87, NWS Tucson, AZ

July 22, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 22, 2021, 2:51 PM MST for Pima County, Arizona. It was in force for 39 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 22, 2021, 2:51 PM MST (21:51 UTC)
Expired: Jul 22, 2021, 3:30 PM MST
In force: 39 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Pima County, AZ

The radar

The Tucson radar (KEMX), 74 km from the middle of the area, began a volume at 21:53 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, 9.9 hours before the alert went out and 41 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: 970 J/kg
Mixed-layer CIN: -227 J/kg
Mixed-layer LCL: 1720 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -25 m²/s²
0-3 km storm-relative helicity: -68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

480 
WUUS55 KTWC 222151
SVRTWC
AZC019-222230-
/O.NEW.KTWC.SV.W.0087.210722T2151Z-210722T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
251 PM MST Thu Jul 22 2021

The National Weather Service in Tucson has issued a

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

* Until 330 PM MST.

* At 251 PM MST, a severe thunderstorm was located 9 miles north of
  Three Points, or 18 miles southwest of Marana, moving north at 10
  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...
  Marana, Three Points, Avra Valley, Tucson Estates, Picture Rocks
  and San Pedro.

This includes the following highways...
 Route 86 between mile markers 141 and 158.
 Route 286 between mile markers 44 and 45.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3210 11118 3201 11147 3231 11159 3243 11126
TIME...MOT...LOC 2151Z 159DEG 10KT 3219 11133 

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

GL

1 follow-up statement

843 
WWUS55 KTWC 222207
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
307 PM MST Thu Jul 22 2021

AZC019-222230-
/O.CON.KTWC.SV.W.0087.000000T0000Z-210722T2230Z/
Pima-
307 PM MST Thu Jul 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MST
FOR NORTH CENTRAL PIMA COUNTY...

At 307 PM MST, a severe thunderstorm was located 10 miles west of
Saguaro National Park West, or 17 miles southwest of Marana, moving
north at 10 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...
Marana, Avra Valley, Tucson Estates, Picture Rocks and San Pedro. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3216 11121 3208 11150 3231 11159 3243 11126
TIME...MOT...LOC 2207Z 159DEG 10KT 3223 11135 

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

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 6:15 PM MST	Special Weather Statement	TWC	Santa Cruz	45 min
Jul 21, 6:35 PM MST	Special Weather Statement	TWC	Pima	55 min
Jul 21, 7:04 PM MST	Special Weather Statement	TWC	Pima	41 min
Jul 21, 9:02 PM MST	Special Weather Statement	TWC		43 min
Jul 22, 1:04 PM MST	Special Weather Statement	TWC	Santa Cruz	26 min
Jul 22, 1:37 PM MST	Severe Thunderstorm Warning	TWC	Pima	38 min
Jul 22, 2:34 PM MST	Special Weather Statement	TWC	Santa Cruz	26 min
Jul 22, 2:36 PM MST	Areal Flood Advisory	TWC	Graham, Pinal	3 hr
Jul 22, 2:43 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	47 min
Jul 22, 3:17 PM MST	Dust Storm Advisory	TWC	Pima, Pinal	58 min
Jul 22, 3:27 PM MST	Severe Thunderstorm Warning	TWC	Pima	27 min
Jul 22, 3:56 PM MST	Dust Storm Advisory	TWC	Pima, Pinal	34 min
Jul 22, 4:01 PM MST	Severe Thunderstorm Warning	TWC	Pima	59 min
Jul 22, 4:11 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 22, 4:35 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	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.