Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 93, NWS Tucson, AZ

July 23, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 23, 2021, 12:46 AM MST for Pima County, Arizona. It was in force for 44 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: Jul 23, 2021, 12:46 AM MST (07:46 UTC)
Expired: Jul 23, 2021, 1:30 AM MST
In force: 44 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), 91 km from the middle of the area, began a volume at 07:46 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 00:00Z, 7.8 hours before the alert went out and 54 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: 2116 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1822 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -15 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.

786 
WUUS55 KTWC 230746
SVRTWC
AZC019-230830-
/O.NEW.KTWC.SV.W.0093.210723T0746Z-210723T0830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
1246 AM MST Fri Jul 23 2021

The National Weather Service in Tucson has issued a

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

* Until 130 AM MST.

* At 1245 AM MST, an area of severe thunderstorms with torrential 
  rainfall was located near Silver Bell and Avra Valley, moving west 
  at 15 mph.

  HAZARD...60 mph wind gusts and torrential rainfall leading to 
           flash flooding.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Avra Valley, Picture Rocks, Queens Well and Silver Bell. 

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 3246 11129 3219 11129 3211 11160 3247 11175
TIME...MOT...LOC 0745Z 086DEG 17KT 3230 11147 

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

Meyer

1 follow-up statement

394 
WWUS55 KTWC 230826
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
126 AM MST Fri Jul 23 2021

AZC019-230830-
/O.EXP.KTWC.SV.W.0093.000000T0000Z-210723T0830Z/
Pima-
126 AM MST Fri Jul 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL PIMA COUNTY WILL
EXPIRE AT 130 AM MST...
                
The storms which prompted the warning have weakened below severe 
limits, and the warning will be allowed to expire. Torrential rain 
is still occurring with these storms with a Flash Flood Warning 
still in effect through 400 AM MST. With saturated ground, wind 
gusts to 40 mph will be sufficient to uproot some trees.

LAT...LON 3246 11129 3219 11129 3211 11160 3247 11175
TIME...MOT...LOC 0820Z 086DEG 17KT 3229 11162 

$$

Meyer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 5:36 PM MST	Special Weather Statement	TWC	Pinal	39 min
Jul 22, 5:42 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 min
Jul 22, 5:44 PM MST	Special Weather Statement	TWC		46 min
Jul 22, 6:01 PM MST	Areal Flood Advisory	TWC	Pima	119 min
Jul 22, 6:19 PM MST	Special Weather Statement	TWC		26 min
Jul 22, 6:33 PM MST	Areal Flood Advisory	TWC	Cochise, Graham	3 hr
Jul 22, 6:37 PM MST	Special Weather Statement	TWC		38 min
Jul 22, 6:47 PM MST	Special Weather Statement	TWC		43 min
Jul 22, 6:57 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Jul 22, 7:02 PM MST	Special Weather Statement	TWC	Graham	28 min
Jul 22, 7:05 PM MST	Areal Flood Advisory	TWC	Pinal	115 min
Jul 22, 7:21 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pinal	2 hr
Jul 22, 7:46 PM MST	Special Weather Statement	TWC	Graham	59 min
Jul 22, 7:58 PM MST	Areal Flood Advisory	TWC	Graham	3 hr
Jul 22, 8:11 PM MST	Special Weather Statement	TWC	Cochise	64 min
Jul 22, 8:21 PM MST	Severe Thunderstorm Warning	TWC	Cochise	39 min
Jul 22, 8:37 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Graham	3 hr
Jul 22, 8:41 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	2 hr
Jul 22, 9:15 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 22, 9:54 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Jul 22, 10:10 PM MST	Special Weather Statement	TWC	Santa Cruz	50 min
Jul 22, 10:15 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 22, 10:18 PM MST	Areal Flood Advisory	TWC	Cochise, Pima, Santa Cruz	3 hr
Jul 22, 10:19 PM MST	Areal Flood Advisory	TWC	Pinal	116 min
Jul 22, 10:34 PM MST	Special Weather Statement	TWC	Cochise	56 min
Jul 22, 10:45 PM MST	Special Weather Statement	TWC		45 min
Jul 22, 10:49 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 22, 11:06 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pinal	3 hr
Jul 22, 11:44 PM MST	Flash Flood Warning Considerable damage threat	TWC	Graham	2 hr
Jul 22, 11:45 PM MST	Severe Thunderstorm Warning	TWC	Pima	60 min
Jul 22, 11:52 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	4 min
Jul 23, 12:07 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 23, 12:51 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 23, 2:13 AM MST	Areal Flood Warning	TWC	Pima	6 hr
Jul 23, 6:47 AM MST	Special Weather Statement	TWC	Pima	43 min
Jul 23, 9:06 AM MST	Areal Flood Warning	TWC	Pima, Pinal	12 hr

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.