Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 71, NWS Tucson, AZ

July 18, 2021Cochise County, Santa Cruz County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 18, 2021, 6:02 PM MST for Cochise County, Santa Cruz County, Arizona. It was in force for 43 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 18, 2021, 6:02 PM MST (01:02 UTC)
Expired: Jul 18, 2021, 6:45 PM MST
In force: 43 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cochise County, AZ, Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 36 km from the middle of the area, began a volume at 01:04 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

Phoenix, AZ (KPSR), launched 00:00Z, 1.0 hours before the alert went out and 245 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: 1031 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 2190 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

963 
WUUS55 KTWC 190102
SVRTWC
AZC003-023-190145-
/O.NEW.KTWC.SV.W.0071.210719T0102Z-210719T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
602 PM MST Sun Jul 18 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  Western Cochise County in southeastern Arizona...
  Northeastern Santa Cruz County in southeastern Arizona...

* Until 645 PM MST.

* At 602 PM MST, a severe thunderstorm was located near Elgin, or 19
  miles west of Sierra Vista, moving northwest at 5 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Patagonia, Sonoita, Elgin, Fort Huachuca and Canelo. 

This includes the following highways...
 Route 82 between mile markers 21 and 27, and between mile markers 34
and 38.
 Route 83 between mile markers 11 and 30.

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 3157 11041 3145 11056 3149 11067 3160 11080
      3172 11056 3166 11046
TIME...MOT...LOC 0102Z 137DEG 5KT 3157 11055 

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

Cerniglia

1 follow-up statement

754 
WWUS55 KTWC 190141
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
641 PM MST Sun Jul 18 2021

AZC003-023-190150-
/O.EXP.KTWC.SV.W.0071.000000T0000Z-210719T0145Z/
Cochise-Santa Cruz-
641 PM MST Sun Jul 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN COCHISE AND
NORTHEASTERN SANTA CRUZ COUNTIES WILL EXPIRE AT 645 PM MST...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still likely with this thunderstorm.

LAT...LON 3157 11041 3145 11056 3149 11067 3160 11080
      3172 11056 3166 11046
TIME...MOT...LOC 0140Z 137DEG 5KT 3161 11059 

$$

Cerniglia

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 5:06 PM MST	Special Weather Statement	TWC		39 min
Jul 18, 5:10 PM MST	Special Weather Statement	TWC	Cochise	35 min
Jul 18, 5:27 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	48 min
Jul 18, 5:30 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 18, 5:37 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Graham, Greenlee	3 hr
Jul 18, 5:42 PM MST	Areal Flood Advisory	TWC	Cochise, Santa Cruz	3 hr
Jul 18, 5:46 PM MST	Special Weather Statement	TWC		44 min
Jul 18, 6:01 PM MST	Special Weather Statement	TWC	Cochise	59 min
Jul 18, 6:06 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	2 hr
Jul 18, 6:11 PM MST	Areal Flood Advisory	TWC	Santa Cruz	3 hr
Jul 18, 6:12 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	48 min
Jul 18, 6:24 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	36 min
Jul 18, 6:33 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Graham	3 hr
Jul 18, 6:39 PM MST	Special Weather Statement	TWC		66 min
Jul 18, 6:43 PM MST	Areal Flood Advisory	TWC	Cochise, Graham, Pima	3 hr
Jul 18, 7:00 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Pima	3 hr
Jul 18, 7:07 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	38 min
Jul 18, 7:23 PM MST	Areal Flood Advisory	TWC	Cochise, Pima, Santa Cruz	3 hr
Jul 18, 7:29 PM MST	Severe Thunderstorm Warning	TWC	Pima	61 min
Jul 18, 7:36 PM MST	Special Weather Statement	TWC	Cochise	39 min
Jul 18, 7:45 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 18, 7:51 PM MST	Special Weather Statement	TWC		39 min
Jul 18, 8:20 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 18, 9:30 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 19, 3:23 PM MST	Special Weather Statement	TWC	Greenlee	22 min
Jul 19, 4:03 PM MST	Areal Flood Advisory	TWC	Greenlee	3 hr
Jul 19, 4:06 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	39 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.