Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 164, NWS Tucson, AZ

August 28, 2021Pima County, Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 28, 2021, 4:58 PM MST for Pima County, Pinal County, Arizona. It was in force for 62 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: Aug 28, 2021, 4:58 PM MST (23:58 UTC)
Expired: Aug 28, 2021, 6:00 PM MST
In force: 62 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Pima County, AZ, Pinal County, AZ

The radar

The Tucson radar (KEMX), 87 km from the middle of the area, began a volume at 00:04 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 12:00Z, 12.0 hours before the alert went out and 47 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: 21 J/kg
Mixed-layer CIN: -393 J/kg
Mixed-layer LCL: 2964 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

233 
WUUS55 KTWC 282358
SVRTWC
AZC019-021-290100-
/O.NEW.KTWC.SV.W.0164.210828T2358Z-210829T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
458 PM MST Sat Aug 28 2021

The National Weather Service in Tucson has issued a

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

* Until 600 PM MST.

* At 457 PM MST, severe thunderstorms were located along a line
  extending from Oracle to near Flowing Wells, 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...
  Western Tucson, Catalina, Oro Valley, Marana, Oracle, Casas 
  Adobes, Flowing Wells, Saddlebrooke, Avra Valley, Tortolita, 
  Catalina State Park, Saguaro National Park West, Picture Rocks, 
  Red Rock, Dove Mountain, and Oracle Junction.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3283 11123 3221 11153 3227 11093 3263 11067
TIME...MOT...LOC 2357Z 102DEG 14KT 3261 11079 3231 11096 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Meyer

2 follow-up statements

383 
WWUS55 KTWC 290027
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
527 PM MST Sat Aug 28 2021

AZC019-021-290100-
/O.CON.KTWC.SV.W.0164.000000T0000Z-210829T0100Z/
Pima-Pinal-
527 PM MST Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MST
FOR NORTHEASTERN PIMA AND SOUTHEASTERN PINAL COUNTIES...

At 525 PM MST, severe thunderstorms were located along a line
extending from 6 miles north of Saddlebrooke to near Casas Adobes,
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...
Marana, Flowing Wells, Saddlebrooke, Avra Valley, Tortolita, Saguaro 
National Park West, Picture Rocks, Red Rock, Dove Mountain

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3283 11123 3221 11153 3227 11093 3263 11067
TIME...MOT...LOC 0025Z 101DEG 15KT 3263 11090 3233 11107 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Meyer

538 
WWUS55 KTWC 290057 RRA
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
557 PM MST Sat Aug 28 2021

AZC019-021-290107-
/O.EXP.KTWC.SV.W.0164.000000T0000Z-210829T0100Z/
Pima-Pinal-
557 PM MST Sat Aug 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PIMA AND
SOUTHEASTERN PINAL COUNTIES WILL EXPIRE AT 600 PM MST...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty 
winds and heavy rain are still possible with these thunderstorms. A 
Flash Flood Warning remains in effect for much of the region. 

LAT...LON 3283 11123 3221 11153 3227 11093 3263 11067
TIME...MOT...LOC 0057Z 102DEG 14KT 3265 11102 3235 11119 

$$

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 5:01 PM MST	Special Weather Statement	TWC		44 min
Aug 27, 5:04 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Aug 27, 5:27 PM MST	Special Weather Statement	TWC		33 min
Aug 28, 3:54 AM MST	Areal Flood Advisory	TWC	Pima	3 hr
Aug 28, 2:34 PM MST	Special Weather Statement	TWC	Santa Cruz	41 min
Aug 28, 2:42 PM MST	Special Weather Statement	TWC	Santa Cruz	48 min
Aug 28, 3:13 PM MST	Severe Thunderstorm Warning	TWC	Pima	47 min
Aug 28, 3:32 PM MST	Areal Flood Advisory	TWC	Pima	118 min
Aug 28, 3:49 PM MST	Special Weather Statement	TWC	Santa Cruz	41 min
Aug 28, 3:53 PM MST	Dust Storm Warning	TWC	Pima	52 min
Aug 28, 3:57 PM MST	Flash Flood Warning	TWC	Santa Cruz	108 min
Aug 28, 3:58 PM MST	Severe Thunderstorm Warning	TWC	Pima	62 min
Aug 28, 4:03 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	117 min
Aug 28, 4:06 PM MST	Special Weather Statement	TWC		39 min
Aug 28, 4:14 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Aug 28, 4:24 PM MST	Severe Thunderstorm Warning	TWC	Pima	51 min
Aug 28, 4:26 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	2 hr
Aug 28, 4:26 PM MST	Severe Thunderstorm Warning	TWC	Pima	34 min
Aug 28, 4:31 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	119 min
Aug 28, 4:34 PM MST	Areal Flood Advisory	TWC	Graham, Pinal	116 min
Aug 28, 4:37 PM MST	Severe Thunderstorm Warning	TWC	Pinal	38 min
Aug 28, 4:47 PM MST	Dust Storm Warning	TWC	Pima, Pinal	118 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.