Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 100, NWS Tucson, AZ

July 30, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 30, 2021, 7:57 PM MST for Pima County, Arizona. It was in force for 48 min. 2 reports 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: Jul 30, 2021, 7:57 PM MST (02:57 UTC)
Expired: Jul 30, 2021, 8:45 PM MST
In force: 48 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), 24 km from the middle of the area, began a volume at 03:00 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.

What was reported inside it

Time	Report	Where	Remark
Jul 30, 8:14 PM MST	TSTM WND GST 63	6 Sw Tucson, AZ	ASOS STATION KTUS TUCSON INTERNATIONAL AIRPORT.
Jul 30, 8:14 PM MST	TSTM WND GST 67	6 Sw Tucson, AZ	CORRECTS PREVIOUS TSTM WND GST REPORT FROM 6 SW TUCSON. ASOS STATION KTUS TUCSON INTERNATIONAL AIRPORT.

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 00:00Z, 3.0 hours before the alert went out and 19 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: 211 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 2641 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

947 
WUUS55 KTWC 310257
SVRTWC
AZC019-310345-
/O.NEW.KTWC.SV.W.0100.210731T0257Z-210731T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
757 PM MST Fri Jul 30 2021

The National Weather Service in Tucson has issued a

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

* Until 845 PM MST.

* At 756 PM MST, a severe thunderstorm was located near Corona De 
  Tucson, or 9 miles northeast of Sahuarita, moving northwest at 10 
  to 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Southern Tucson, Sahuarita, Corona De Tucson, Tucson International 
  Airport and Summit.

This includes the following highways...
 Interstate 10 between mile markers 277 and 279.
 Interstate 19 between mile markers 46 and 53.

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 3203 11071 3189 11080 3196 11105 3214 11095
TIME...MOT...LOC 0256Z 122DEG 8KT 3201 11084 

HAIL...<.75IN
WIND...60MPH
 
$$

Meyer

2 follow-up statements

364 
WWUS55 KTWC 310312
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
812 PM MST Fri Jul 30 2021

AZC019-310345-
/O.CON.KTWC.SV.W.0100.000000T0000Z-210731T0345Z/
Pima-
812 PM MST Fri Jul 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM MST
FOR EAST CENTRAL PIMA COUNTY...

At 810 PM MST, a severe thunderstorm was located over Summit, or 8
miles south of Davis-Monthan Air Force Base, moving northwest at 15
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Southern Tucson, Sahuarita, Vail, Corona De Tucson, 
Tucson International Airport and Summit.

This includes the following highways...
 Interstate 10 between mile markers 277 and 279.
 Interstate 19 between mile markers 46 and 53.

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 3203 11071 3189 11080 3196 11105 3214 11095
TIME...MOT...LOC 0310Z 125DEG 9KT 3205 11090 

HAIL...<.75IN
WIND...60MPH
 
$$

Meyer

206 
WWUS55 KTWC 310350
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
850 PM MST Fri Jul 30 2021

AZC019-310356-
/O.EXP.KTWC.SV.W.0100.000000T0000Z-210731T0345Z/
Pima-
850 PM MST Fri Jul 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PIMA COUNTY HAS
EXPIRED...
        
The storm which prompted the warning for areas near southern 
Tucson and the Sahuarita area has moved into southwest and west 
Tucson. A warning remains in effect for that area. Heavy rain may 
continue.

LAT...LON 3203 11071 3189 11080 3196 11105 3214 11095
TIME...MOT...LOC 0346Z 122DEG 8KT 3209 11097 

$$

Meyer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 5:20 PM MST	Severe Thunderstorm Warning	TWC	Pima	55 min
Jul 30, 5:22 PM MST	Severe Thunderstorm Warning	TWC	Pima	29 min
Jul 30, 6:11 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 30, 6:33 PM MST	Special Weather Statement	TWC		42 min
Jul 30, 6:52 PM MST	Special Weather Statement	TWC		38 min
Jul 30, 7:10 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 30, 7:20 PM MST	Areal Flood Advisory	TWC	Pima	4 hr
Jul 30, 7:40 PM MST	Special Weather Statement	TWC		65 min
Jul 30, 7:49 PM MST	Severe Thunderstorm Warning	TWC	Pima	41 min
Jul 30, 7:51 PM MST	Areal Flood Advisory	TWC	Pima	114 min
Jul 30, 7:59 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 30, 8:20 PM MST	Severe Thunderstorm Warning	TWC	Pima	40 min
Jul 30, 8:29 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 30, 8:35 PM MST	Areal Flood Advisory	TWC	Pima	115 min
Jul 30, 8:47 PM MST	Flash Flood Warning	TWC	Pima	118 min
Jul 30, 9:55 PM MST	Special Weather Statement	TWC	Pinal	65 min
Jul 30, 10:11 PM MST	Flash Flood Warning	TWC	Pima	4 hr
Jul 30, 11:37 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Jul 31, 2:06 AM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 31, 3:51 PM MST	Areal Flood Advisory	TWC	Pinal	114 min
Jul 31, 4:13 PM MST	Special Weather Statement	TWC		47 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.