Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 179, NWS Tucson, AZ

September 5, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Sep 5, 2021, 3:40 PM MST for Pima County, Arizona. It was in force for 50 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 5, 2021, 3:40 PM MST (22:40 UTC)
Expired: Sep 5, 2021, 4:30 PM MST
In force: 50 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

County Pima County, AZ

The radar

The Tucson radar (KEMX), 29 km from the middle of the area, began a volume at 22:43 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.

What was reported inside it

Time	Report	Where	Remark
Sep 5, 3:43 PM MST	TSTM WND GST 66	9 E Tucson, AZ	MESONET STATION CW6532 TUCSON FREEMAN/OLD SPANISH TRL.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 10.7 hours before the alert went out and 17 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: 1016 J/kg
Mixed-layer CIN: -184 J/kg
Mixed-layer LCL: 1856 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

002 
WUUS55 KTWC 052240
SVRTWC
AZC019-052330-
/O.NEW.KTWC.SV.W.0179.210905T2240Z-210905T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
340 PM MST Sun Sep 5 2021

The National Weather Service in Tucson has issued a

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

* Until 430 PM MST.

* At 340 PM MST, a severe thunderstorm was located over Saguaro
  National Park East, or 13 miles east of Davis-Monthan Air Force
  Base, moving southwest at 20 mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  East Tucson, Davis-Monthan Air Force Base, Tanque Verde, Vail, 
  East Sahuarita, Corona De Tucson, Summit, Saguaro National Park 
  East and Rita Ranch.

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 3228 11062 3213 11050 3192 11082 3209 11103
TIME...MOT...LOC 2240Z 055DEG 18KT 3216 11065 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Meyer

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 11:52 AM MST	Special Weather Statement	TWC	Santa Cruz	23 min
Sep 5, 12:12 PM MST	Special Weather Statement	TWC	Cochise	33 min
Sep 5, 12:24 PM MST	Severe Thunderstorm Warning	TWC	Cochise	51 min
Sep 5, 12:37 PM MST	Areal Flood Advisory	TWC	Cochise	7 min
Sep 5, 12:44 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	106 min
Sep 5, 12:58 PM MST	Severe Thunderstorm Warning	TWC	Cochise	19 min
Sep 5, 1:02 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	43 min
Sep 5, 1:26 PM MST	Areal Flood Advisory	TWC	Santa Cruz	2 hr
Sep 5, 2:10 PM MST	Special Weather Statement	TWC	Santa Cruz	50 min
Sep 5, 2:15 PM MST	Special Weather Statement	TWC	Graham	45 min
Sep 5, 2:25 PM MST	Special Weather Statement	TWC	Santa Cruz	50 min
Sep 5, 2:29 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	61 min
Sep 5, 2:31 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	44 min
Sep 5, 2:34 PM MST	Special Weather Statement	TWC	Graham	41 min
Sep 5, 2:54 PM MST	Areal Flood Advisory	TWC	Pima	111 min
Sep 5, 3:08 PM MST	Severe Thunderstorm Warning Considerable damage threat	TWC	Pima, Santa Cruz	37 min
Sep 5, 3:13 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	2 hr
Sep 5, 3:15 PM MST	Tornado Warning	TWC	Pima	15 min
Sep 5, 3:22 PM MST	Dust Storm Warning	TWC	Pima	113 min
Sep 5, 3:24 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	66 min
Sep 5, 3:37 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	53 min
Sep 5, 3:41 PM MST	Flash Flood Warning Considerable damage threat	TWC	Graham	2 hr
Sep 5, 3:52 PM MST	Severe Thunderstorm Warning	TWC	Pima	38 min
Sep 5, 3:55 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Sep 5, 4:00 PM MST	Severe Thunderstorm Warning Considerable damage threat	TWC	Graham	45 min
Sep 5, 4:06 PM MST	Areal Flood Advisory	TWC	Pima	114 min
Sep 5, 4:12 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Sep 5, 4:16 PM MST	Severe Thunderstorm Warning Considerable damage threat	TWC	Pima	59 min
Sep 5, 4:30 PM MST	Severe Thunderstorm Warning	TWC	Pima	45 min
Sep 5, 4:42 PM MST	Dust Storm Warning	TWC	Pima, Pinal	93 min
Sep 5, 4:42 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	63 min
Sep 5, 4:47 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	43 min
Sep 5, 4:48 PM MST	Flash Flood Warning	TWC	Pima	117 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.