Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 22, NWS Tucson, AZ

July 21, 2012Pima County, Santa Cruz County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 21, 2012, 12:56 PM MST for Pima County, Santa Cruz County, Arizona. It was in force for 34 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 21, 2012, 12:56 PM MST (19:56 UTC)
Expired
Jul 21, 2012, 1:30 PM MST
In force
34 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon

Counties Pima County, AZ, Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 48 km from the middle of the area, began a volume at 19:58 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, 7.9 hours before the alert went out and 55 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 12:00Z on 2012-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 444 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 12:00Z on 2012-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 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
444 J/kg
Mixed-layer CIN
-130 J/kg
Mixed-layer LCL
1517 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

676 
WUUS55 KTWC 211956
SVRTWC
AZC019-023-212030-
/O.NEW.KTWC.SV.W.0022.120721T1956Z-120721T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
1256 PM MST SAT JUL 21 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN PIMA COUNTY IN SOUTH CENTRAL ARIZONA...
  NORTH CENTRAL SANTA CRUZ COUNTY IN SOUTHEAST ARIZONA...

* UNTIL 130 PM MST

* AT 1250 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES NORTH OF TUBAC...OR 10
  MILES SOUTH OF GREEN VALLEY...AND MOVING WEST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO AMADO
  AND ARIVACA JUNCTION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER INDOORS. EXPECT DAMAGING WINDS IN EXCESS OF 60 MPH...
LARGE HAIL...FREQUENT LIGHTNING...AND HEAVY RAIN WITH THIS STORM.

&&

LAT...LON 3166 11122 3184 11110 3176 11091 3160 11099
TIME...MOT...LOC 1956Z 110DEG 9KT 3171 11105

$$

MEYER
2 follow-up statements
257 
WWUS55 KTWC 212011
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
111 PM MST SAT JUL 21 2012

AZC019-023-212030-
/O.CON.KTWC.SV.W.0022.000000T0000Z-120721T2030Z/
SANTA CRUZ AZ-PIMA AZ-
111 PM MST SAT JUL 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM MST
FOR SOUTHEASTERN PIMA AND NORTH CENTRAL SANTA CRUZ COUNTIES...

AT 110 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR AMADO...OR 11 MILES
SOUTH OF GREEN VALLEY...MOVING WEST AT 10 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER INDOORS. EXPECT DAMAGING WINDS IN EXCESS OF 60 MPH...
LARGE HAIL...FREQUENT LIGHTNING...AND HEAVY RAIN WITH THIS STORM.

&&

LAT...LON 3166 11122 3184 11110 3176 11091 3160 11099
TIME...MOT...LOC 2011Z 110DEG 9KT 3170 11107

$$

MEYER
572 
WWUS55 KTWC 212028
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
128 PM MST SAT JUL 21 2012

AZC019-023-212038-
/O.EXP.KTWC.SV.W.0022.000000T0000Z-120721T2030Z/
SANTA CRUZ AZ-PIMA AZ-
128 PM MST SAT JUL 21 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PIMA AND NORTH
CENTRAL SANTA CRUZ COUNTIES WILL EXPIRE AT 130 PM MST...

AT 128 PM MST THE THUNDERSTORMS NEAR INTERSTATE 19 BETWEEN GREEN 
VALLEY AND TUBAC HAD WEAKENED.

LAT...LON 3166 11122 3184 11110 3176 11091 3160 11099
TIME...MOT...LOC 2028Z 110DEG 9KT 3171 11112

$$

MEYER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 5:26 PM MSTAreal Flood AdvisoryTWCPima94 min
Jul 21, 12:49 PM MSTSpecial Weather StatementTWCSanta Cruz41 min
Jul 21, 1:43 PM MSTAreal Flood AdvisoryTWCPima, Santa Cruz2 hr
Jul 21, 1:53 PM MSTFlash Flood WarningTWCPima112 min
Jul 21, 2:26 PM MSTAreal Flood AdvisoryTWCGraham2 hr
Jul 21, 2:27 PM MSTSevere Thunderstorm WarningTWCPima33 min
Jul 21, 3:01 PM MSTSevere Thunderstorm WarningTWCPima44 min
Jul 21, 3:05 PM MSTSevere Thunderstorm WarningTWCPima40 min
Jul 21, 3:25 PM MSTSevere Thunderstorm WarningTWCPinal50 min
Jul 21, 3:36 PM MSTSevere Thunderstorm WarningTWCGraham, Pinal39 min
Jul 21, 3:38 PM MSTAreal Flood AdvisoryTWCPima58 min
Jul 21, 4:07 PM MSTAreal Flood AdvisoryTWCPinal83 min
Jul 21, 4:11 PM MSTAreal Flood AdvisoryTWCPinal79 min
Jul 21, 4:27 PM MSTAreal Flood AdvisoryTWCPima, Pinal108 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2012Every severe thunderstorm warning in 2012

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.