Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 183, NWS Tucson, AZ

September 5, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Sep 5, 2021, 4:30 PM MST for Pima County, Arizona. It was in force for 45 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, 4:30 PM MST (23:30 UTC)
Expired: Sep 5, 2021, 5:15 PM MST
In force: 45 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), 45 km from the middle of the area, began a volume at 23:30 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, 4:46 PM MST	TSTM WND DMG	4 Sw Tucson, AZ	POWER OUTAGES, LIKELY DUE TO SEVERE THUNDERSTORM.

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, 11.5 hours before the alert went out and 5 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.

607 
WUUS55 KTWC 052330
SVRTWC
AZC019-060015-
/O.NEW.KTWC.SV.W.0183.210905T2330Z-210906T0015Z/

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

The National Weather Service in Tucson has issued a

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

* Until 515 PM MST.

* At 429 PM MST, a severe thunderstorm was located near central and 
  western Tucson, moving west at 10 mph.

  HAZARD...60 mph wind gusts.

  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 Foothills, Tucson International Airport.

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 3240 11078 3202 11079 3198 11092 3210 11104
      3240 11117
TIME...MOT...LOC 2329Z 074DEG 9KT 3225 11093 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Meyer

2 follow-up statements

786 
WWUS55 KTWC 052346
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
446 PM MST Sun Sep 5 2021

AZC019-060015-
/O.CON.KTWC.SV.W.0183.000000T0000Z-210906T0015Z/
Pima-
446 PM MST Sun Sep 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MST
FOR NORTHEASTERN PIMA COUNTY...

At 442 PM MST, a severe thunderstorm was located near Catalina 
Foothills and northern Tucson, or 7 miles north of Tucson, moving 
southwest at 10 mph. The storm near mid-town and South Tucson has 
weakened below severe limits.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Northern Tucson, Oro Valley, Casas Adobes, Drexel Heights, Flowing 
Wells, Tortolita, Sabino Canyon Recreation Area, Catalina Foothills, 
Tucson Estates and Picture Rocks.

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 3240 11078 3217 11079 3210 11104 3240 11117
TIME...MOT...LOC 2342Z 059DEG 10KT 3230 11089 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Meyer

590 
WWUS55 KTWC 060016
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
516 PM MST Sun Sep 5 2021

AZC019-060024-
/O.EXP.KTWC.SV.W.0183.000000T0000Z-210906T0015Z/
Pima-
516 PM MST Sun Sep 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PIMA COUNTY WILL
EXPIRE AT 515 PM MST...
                
The storm which prompted the warning near Catalina Foothills and 
north Tucson weakened below severe limits as it moved into central 
and west Tucson, and no longer poses an immediate threat to life or 
property. Therefore, the warning will be allowed to expire.  However 
heavy rain is still expected with this thunderstorm and a Flash 
Flood Warning remains in effect.

LAT...LON 3240 11078 3217 11079 3210 11104 3240 11117
TIME...MOT...LOC 0014Z 074DEG 9KT 3228 11096 

$$

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, 3:40 PM MST	Severe Thunderstorm Warning Considerable damage threat	TWC	Pima	50 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, 4:42 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.