Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 195, NWS Tucson, AZ

September 26, 2021Cochise County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Sep 26, 2021, 11:57 AM MST for Cochise County, Arizona. It was in force for 28 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: Sep 26, 2021, 11:57 AM MST (18:57 UTC)
Expired: Sep 26, 2021, 12:25 PM MST
In force: 28 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Cochise County, AZ

The radar

The Tucson radar (KEMX), 67 km from the middle of the area, began a volume at 18:57 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 12:00Z, 7.0 hours before the alert went out and 106 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: 252 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1157 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

038 
WUUS55 KTWC 261857
SVRTWC
AZC003-261945-
/O.NEW.KTWC.SV.W.0195.210926T1857Z-210926T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
1157 AM MST Sun Sep 26 2021

The National Weather Service in Tucson has issued a

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

* Until 1245 PM MST.

* At 1155 AM MST, a severe thunderstorm was located 8 miles northeast
  of Hereford, or 8 miles east of Sierra Vista, moving northeast at
  25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated and spotter observed marble sized hail in 
           Hereford and the storm continues to intensify.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Sierra Vista, Bisbee, Hereford, Tombstone, Palominas and
  Charleston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and 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.

&&

LAT...LON 3153 11025 3191 10999 3158 10967 3133 11009
      3133 11011
TIME...MOT...LOC 1855Z 230DEG 20KT 3150 11008 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Cerniglia

1 follow-up statement

993 
WWUS55 KTWC 261925
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
1225 PM MST Sun Sep 26 2021

AZC003-261935-
/O.CAN.KTWC.SV.W.0195.000000T0000Z-210926T1945Z/
Cochise-
1225 PM MST Sun Sep 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN COCHISE COUNTY IS
CANCELLED...
                
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 has been cancelled.

LAT...LON 3153 11025 3191 10999 3158 10967 3133 11009
      3133 11011
TIME...MOT...LOC 1916Z 230DEG 20KT 3161 10993 

$$

Zell

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 25, 5:03 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Sep 25, 6:27 PM MST	Areal Flood Advisory	TWC	Cochise, Graham, Pima, Pinal	3 hr
Sep 25, 6:46 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Pinal	3 hr
Sep 25, 7:17 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Sep 26, 11:51 AM MST	Special Weather Statement	TWC	Cochise	39 min
Sep 26, 12:20 PM MST	Special Weather Statement	TWC		40 min
Sep 26, 12:44 PM MST	Special Weather Statement	TWC	Santa Cruz	46 min
Sep 26, 12:58 PM MST	Special Weather Statement	TWC	Cochise	47 min
Sep 26, 1:21 PM MST	Special Weather Statement	TWC		39 min
Sep 26, 1:40 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	50 min
Sep 26, 2:18 PM MST	Special Weather Statement	TWC	Santa Cruz	42 min
Sep 26, 2:33 PM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	104 min
Sep 26, 2:56 PM MST	Severe Thunderstorm Warning	TWC	Pima	49 min
Sep 26, 3:43 PM MST	Special Weather Statement	TWC	Santa Cruz	47 min
Sep 26, 4:24 PM MST	Special Weather Statement	TWC	Pima	51 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.