Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 160, NWS Tucson, AZ

August 28, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 28, 2021, 3:58 PM MST for Pima 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, 3:58 PM MST (22:58 UTC)
Expired: Aug 28, 2021, 5:00 PM MST
In force: 62 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Pima County, AZ

The radar

The Tucson radar (KEMX), 50 km from the middle of the area, began a volume at 23:00 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, 11.0 hours before the alert went out and 16 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.

765 
WUUS55 KTWC 282258
SVRTWC
AZC019-290000-
/O.NEW.KTWC.SV.W.0160.210828T2258Z-210829T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
358 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...

* Until 500 PM MST.

* At 356 PM MST, a severe thunderstorm was located near Sabino 
  Canyon Recreation Area, or 9 miles northeast of Davis-Monthan Air 
  Force Base, 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...
  Tucson, Oro Valley, Marana, Casas Adobes, Drexel Heights, Flowing 
  Wells, Tanque Verde, South Tucson, Tortolita, Sabino Canyon 
  Recreation Area, Catalina State Park, and Catalina Foothills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3236 11070 3219 11070 3215 11110 3248 11103
TIME...MOT...LOC 2256Z 090DEG 13KT 3228 11079 

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

$$

Meyer

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, 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
Aug 28, 4:58 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	62 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.