Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 99, NWS Tucson, AZ

July 30, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 30, 2021, 7:49 PM MST for Pima County, Arizona. It was in force for 41 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: Jul 30, 2021, 7:49 PM MST (02:49 UTC)
Expired: Jul 30, 2021, 8:30 PM MST
In force: 41 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), 35 km from the middle of the area, began a volume at 02:51 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, 8:30 PM MST	TSTM WND GST 55	2 Se Tucson, AZ	ASOS STATION KDMA DAVIS MONTHAN AFB.

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, 2.8 hours before the alert went out and 22 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.

924 
WUUS55 KTWC 310249
SVRTWC
AZC019-310330-
/O.NEW.KTWC.SV.W.0099.210731T0249Z-210731T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
749 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 830 PM MST.

* At 748 PM MST, a severe thunderstorm was located over Saguaro
  National Park East, or 11 miles east of Davis-Monthan Air Force
  Base, moving northwest at 10 to 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, Davis-Monthan Air Force Base, Tanque Verde, Saguaro
  National Park East, Sabino Canyon Recreation Area, Catalina
  Foothills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3219 11053 3208 11061 3219 11094 3237 11075
TIME...MOT...LOC 0248Z 122DEG 8KT 3216 11067 

HAIL...0.75IN
WIND...60MPH
 
$$

Meyer

1 follow-up statement

986 
WWUS55 KTWC 310332
SVSTWC

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

AZC019-310339-
/O.EXP.KTWC.SV.W.0099.000000T0000Z-210731T0330Z/
Pima-
832 PM MST Fri Jul 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PIMA COUNTY WILL
EXPIRE AT 830 PM MST...
        
The storm which prompted the warning has moved into central 
and southern Tucson. Therefore, this warning will expire while 
Severe Thunderstorm Warnings remain in effect across the central and 
western Tucson area.

LAT...LON 3219 11053 3208 11061 3219 11094 3237 11075
TIME...MOT...LOC 0329Z 122DEG 8KT 3220 11075 

$$

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, 7:51 PM MST	Areal Flood Advisory	TWC	Pima	114 min
Jul 30, 7:57 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 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.