Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 128, NWS Tucson, AZ

August 8, 2021Cochise County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 8, 2021, 6:09 PM MST for Cochise County, Arizona. It was in force for 66 min. 1 report 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
Aug 8, 2021, 6:09 PM MST (01:09 UTC)
Expired
Aug 8, 2021, 7:15 PM MST
In force
66 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), 49 km from the middle of the area, began a volume at 01:13 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

TimeReportWhereRemark
Aug 8, 6:50 PM MSTTSTM WND DMG2 Wnw Saint David, AZTREE FELL ON POWER LINES ON SABIN RD, ST DAVID.

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, 1.2 hours before the alert went out and 75 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-pSkew-T log-p diagram, Tuscon, AZ at 00:00Z on 2021-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 742 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 00:00Z on 2021-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -60 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
742 J/kg
Mixed-layer CIN
-62 J/kg
Mixed-layer LCL
2449 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-60 m²/s²
0-3 km storm-relative helicity
31 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

628 
WUUS55 KTWC 090109
SVRTWC
AZC003-090215-
/O.NEW.KTWC.SV.W.0128.210809T0109Z-210809T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
609 PM MST Sun Aug 8 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  West central Cochise County in southeastern Arizona...

* Until 715 PM MST.

* At 609 PM MST, a severe thunderstorm was located over Dragoon, or
  16 miles east of Benson, moving southwest at 10 mph.

  HAZARD...60 mph wind gusts, quarter size hail and blowing dust.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Benson, St. David, Dragoon and Texas Canyon. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3213 11006 3195 10994 3175 11021 3204 11036
TIME...MOT...LOC 0109Z 058DEG 10KT 3202 11004 

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

$$
2 follow-up statements
609 
WWUS55 KTWC 090123
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
623 PM MST Sun Aug 8 2021

AZC003-090215-
/O.CON.KTWC.SV.W.0128.000000T0000Z-210809T0215Z/
Cochise-
623 PM MST Sun Aug 8 2021

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

At 622 PM MST, a severe thunderstorm was located over St. David, or 7
miles east of Benson, moving southwest at 25 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Benson and St. David. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3210 11016 3190 11001 3175 11021 3204 11036
TIME...MOT...LOC 0122Z 057DEG 21KT 3193 11020 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$
213 
WWUS55 KTWC 090206
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
706 PM MST Sun Aug 8 2021

AZC003-090215-
/O.EXP.KTWC.SV.W.0128.000000T0000Z-210809T0215Z/
Cochise-
706 PM MST Sun Aug 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL COCHISE COUNTY
WILL EXPIRE AT 715 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 brief heavy rain are still possible with this thunderstorm 
through 715 pm.

LAT...LON 3210 11016 3190 11001 3175 11021 3204 11036
TIME...MOT...LOC 0205Z 058DEG 10KT 3188 11029 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 8, 5:03 PM MSTSpecial Weather StatementTWCCochise42 min
Aug 8, 5:18 PM MSTSpecial Weather StatementTWCSanta Cruz27 min
Aug 8, 5:22 PM MSTSpecial Weather StatementTWCPima38 min
Aug 8, 5:22 PM MSTSevere Thunderstorm WarningTWCCochise38 min
Aug 8, 5:28 PM MSTSpecial Weather StatementTWCCochise47 min
Aug 8, 5:51 PM MSTSpecial Weather StatementTWCPima24 min
Aug 8, 6:10 PM MSTAreal Flood AdvisoryTWCPima2 hr
Aug 8, 6:13 PM MSTSpecial Weather StatementTWCPima32 min
Aug 8, 6:14 PM MSTSevere Thunderstorm WarningTWCCochise20 min
Aug 8, 6:19 PM MSTSevere Thunderstorm WarningTWCPima41 min
Aug 8, 6:37 PM MSTAreal Flood AdvisoryTWCCochise5 hr
Aug 8, 6:46 PM MSTFlash Flood Warning Considerable damage threatTWCCochise5 hr
Aug 8, 6:56 PM MSTDust Storm AdvisoryTWCCochise, Pima, Pinal70 min
Aug 8, 8:45 PM MSTSevere Thunderstorm WarningTWCPima, Santa Cruz45 min
Aug 8, 9:03 PM MSTFlash Flood Warning Considerable damage threatTWCPima117 min
Aug 8, 9:28 PM MSTAreal Flood AdvisoryTWCCochise, Pima, Santa Cruz2 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2021Every 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.