Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 192, NWS Tucson, AZ

September 7, 2021Cochise County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Sep 7, 2021, 6:43 PM MST for Cochise County, Arizona. It was in force for 32 min. 5 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: Sep 7, 2021, 6:43 PM MST (01:43 UTC)
Expired: Sep 7, 2021, 7:15 PM MST
In force: 32 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Cochise County, AZ

The radar

The Tucson radar (KEMX), 60 km from the middle of the area, began a volume at 01:44 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
Sep 7, 7:00 PM MST	HAIL 1	11 Wnw Bisbee, AZ
Sep 7, 7:06 PM MST	HAIL 1.25	12 Wnw Bisbee, AZ
Sep 7, 7:08 PM MST	HAIL 0.75	11 Se Sierra Vista, AZ
Sep 7, 7:12 PM MST	HAIL 0.88	10 Se Sierra Vista, AZ
Sep 7, 7:12 PM MST	HAIL 1	11 Se Sierra Vista, AZ

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, 1.7 hours before the alert went out and 100 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: 2033 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 2247 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

127 
WUUS55 KTWC 080143
SVRTWC
AZC003-080215-
/O.NEW.KTWC.SV.W.0192.210908T0143Z-210908T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
643 PM MST Tue Sep 7 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  Southwestern Cochise County in southeastern Arizona...

* Until 715 PM MST.

* At 643 PM MST, a severe thunderstorm was located 7 miles northeast
  of Hereford, or 8 miles northwest of Bisbee, moving west at 30 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Sierra Vista, Bisbee, Hereford and Fort Huachuca. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 3162 11030 3152 10993 3139 10995 3148 11032
TIME...MOT...LOC 0143Z 099DEG 24KT 3146 11005 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

GL

1 follow-up statement

678 
WWUS55 KTWC 080205
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
705 PM MST Tue Sep 7 2021

AZC003-080215-
/O.CON.KTWC.SV.W.0192.000000T0000Z-210908T0215Z/
Cochise-
705 PM MST Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MST
FOR SOUTHWESTERN COCHISE COUNTY...

At 704 PM MST, a severe thunderstorm was located over Sierra Vista, 
moving west at 30 mph. A trained spotter reported quarter size hail 
in Hereford. 

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Sierra Vista, Bisbee, Hereford and Fort Huachuca. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 3162 11030 3152 10993 3139 10995 3148 11032
TIME...MOT...LOC 0204Z 099DEG 24KT 3148 11022 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 5:13 PM MST	Special Weather Statement	TWC	Cochise	47 min
Sep 7, 5:18 PM MST	Severe Thunderstorm Warning	TWC	Cochise	42 min
Sep 7, 5:53 PM MST	Severe Thunderstorm Warning	TWC	Cochise	67 min
Sep 7, 6:20 PM MST	Severe Thunderstorm Warning	TWC	Cochise	55 min
Sep 7, 7:15 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Santa Cruz	25 min
Sep 7, 7:44 PM MST	Special Weather Statement	TWC	Cochise	46 min
Sep 7, 7:56 PM MST	Severe Thunderstorm Warning	TWC	Cochise	49 min
Sep 7, 8:47 PM MST	Special Weather Statement	TWC	Cochise	43 min
Sep 8, 4:45 PM MST	Special Weather Statement	TWC		45 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.