Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Tucson, AZ

July 2, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 2, 2021, 2:48 PM MST for Pima County, Arizona. It was in force for 42 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 2, 2021, 2:48 PM MST (21:48 UTC)
Expired: Jul 2, 2021, 3:30 PM MST
In force: 42 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), 54 km from the middle of the area, began a volume at 21:50 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 2, 3:38 PM MST	TSTM WND DMG	7 Nnw Tucson, AZ	ELECTRICAL POWER LINE DOWN BLOCKING ROAD NEAR 1ST AVE AND WETMORE ROAD. VEHICLE TRAVEL RESTRICTED TO ONE LANE.
Jul 2, 3:39 PM MST	TSTM WND DMG	7 Nnw Tucson, AZ	TWEET OF BLOWN DOWN TREE ON NORTH BOUND LANE OF RIVER ROAD AND RIVER ROAD.

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, 9.8 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: 385 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1652 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

710 
WUUS55 KTWC 022148
SVRTWC
AZC019-022230-
/O.NEW.KTWC.SV.W.0008.210702T2148Z-210702T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
248 PM MST Fri Jul 2 2021

The National Weather Service in Tucson has issued a

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

* Until 330 PM MST.

* At 248 PM MST, a severe thunderstorm was located over Sabino Canyon
  Recreation Area, or 9 miles north of Tucson, moving west at 10 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, Oro Valley, Casas Adobes, Flowing Wells, Tanque Verde,
  Tortolita, Sabino Canyon Recreation Area, Catalina Foothills,
  Catalina State Park and Seven Falls.

This includes the following highways...
 Interstate 10 between mile markers 251 and 257.
 Route 77 between mile markers 70 and 82.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3238 11074 3223 11076 3224 11106 3246 11102
TIME...MOT...LOC 2148Z 098DEG 7KT 3232 11084 

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

RH

2 follow-up statements

674 
WWUS55 KTWC 022215
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
315 PM MST Fri Jul 2 2021

AZC019-022230-
/O.CON.KTWC.SV.W.0008.000000T0000Z-210702T2230Z/
Pima-
315 PM MST Fri Jul 2 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MST
FOR NORTHEASTERN PIMA COUNTY...

At 314 PM MST, a severe thunderstorm was located over Catalina
Foothills, or 7 miles southeast of Oro Valley, moving west at 10 mph.

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

SOURCE...Trained weather spotters.

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

Locations impacted include...
Tucson, Oro Valley, Casas Adobes, Flowing Wells, Tortolita, Catalina
Foothills and Catalina State Park.

This includes the following highways...
 Interstate 10 between mile markers 251 and 257.
 Route 77 between mile markers 70 and 82.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3241 11085 3229 11084 3224 11089 3224 11106
      3246 11102
TIME...MOT...LOC 2214Z 098DEG 7KT 3233 11090 

HAIL...0.75IN
WIND...70MPH
 
$$

JRM

783 
WWUS55 KTWC 022230
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
330 PM MST Fri Jul 2 2021

AZC019-022239-
/O.EXP.KTWC.SV.W.0008.000000T0000Z-210702T2230Z/
Pima-
330 PM MST Fri Jul 2 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PIMA COUNTY WILL
EXPIRE AT 330 PM MST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3241 11085 3229 11084 3224 11089 3224 11106
      3246 11102
TIME...MOT...LOC 2229Z 098DEG 7KT 3233 11093 

$$

JRM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 5:15 PM MST	Special Weather Statement	TWC	Cochise	45 min
Jul 2, 11:58 AM MST	Areal Flood Advisory	TWC	Cochise, Graham	3 hr
Jul 2, 12:46 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 2, 1:34 PM MST	Special Weather Statement	TWC	Graham	26 min
Jul 2, 2:05 PM MST	Severe Thunderstorm Warning	TWC	Pinal	40 min
Jul 2, 2:27 PM MST	Special Weather Statement	TWC		33 min
Jul 2, 2:36 PM MST	Severe Thunderstorm Warning	TWC	Pinal	39 min
Jul 2, 2:53 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 2, 3:01 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	44 min
Jul 2, 3:10 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	50 min
Jul 2, 3:14 PM MST	Areal Flood Advisory	TWC	Pinal	3 hr
Jul 2, 3:24 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 2, 3:25 PM MST	Dust Storm Warning	TWC	Pima, Pinal	95 min
Jul 2, 3:33 PM MST	Severe Thunderstorm Warning	TWC	Cochise	42 min
Jul 2, 3:35 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	40 min
Jul 2, 3:54 PM MST	Special Weather Statement	TWC	Santa Cruz	51 min
Jul 2, 3:55 PM MST	Special Weather Statement	TWC	Graham	65 min
Jul 2, 4:06 PM MST	Severe Thunderstorm Warning	TWC	Cochise	39 min
Jul 2, 4:09 PM MST	Special Weather Statement	TWC	Graham	51 min
Jul 2, 4:24 PM MST	Special Weather Statement	TWC	Santa Cruz	36 min
Jul 2, 4:34 PM MST	Special Weather Statement	TWC	Santa Cruz	26 min
Jul 2, 4:35 PM MST	Special Weather Statement	TWC	Cochise	40 min
Jul 2, 4:46 PM MST	Special Weather Statement	TWC	Santa Cruz	29 min
Jul 2, 4:51 PM MST	Special Weather Statement	TWC	Pinal	24 min
Jul 2, 4:56 PM MST	Areal Flood Advisory	TWC	Santa Cruz	3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.