Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 33, NWS Tucson, AZ

July 23, 2012Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 23, 2012, 4:28 PM MST for Pinal County, Arizona. It was in force for 32 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 23, 2012, 4:28 PM MST (23:28 UTC)
Expired: Jul 23, 2012, 5:00 PM MST
In force: 32 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pinal County, AZ

The radar

The Tucson radar (KEMX), 89 km from the middle of the area, began a volume at 23:30 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, 11.5 hours before the alert went out and 52 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: 265 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 1454 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 48 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.

137 
WUUS55 KTWC 232328
SVRTWC
AZC021-240000-
/O.NEW.KTWC.SV.W.0033.120723T2328Z-120724T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
428 PM MST MON JUL 23 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL PINAL COUNTY IN SOUTH CENTRAL ARIZONA...

* UNTIL 500 PM MST

* AT 421 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  ORACLE JUNCTION...OR 12 MILES NORTH OF ORO VALLEY...AND MOVING
  NORTHWEST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTY.

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 3266 11115 3272 11090 3256 11084 3252 11104
TIME...MOT...LOC 2328Z 135DEG 10KT 3261 11098

$$

2 follow-up statements

672 
WWUS55 KTWC 232339
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
439 PM MST MON JUL 23 2012

AZC021-240000-
/O.CON.KTWC.SV.W.0033.000000T0000Z-120724T0000Z/
PINAL AZ-
439 PM MST MON JUL 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM MST
FOR SOUTH CENTRAL PINAL COUNTY...

AT 430 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A VERY LOCALIZED SEVERE THUNDERSTORM CAPABLE OF PRODUCING 
DAMAGING WINDS IN EXCESS OF 60 MPH...ESPECIALLY NEAR AND NORTH OF 
ORACLE JUNCTION ALONG HIGHWAY 79.  

THIS STORM WAS LOCATED NEAR ORACLE JUNCTION...OR 12 MILES NORTH OF 
ORO VALLEY...MOVING NORTHWEST AT 5 MPH.

LAT...LON 3266 11115 3272 11090 3256 11084 3252 11104
TIME...MOT...LOC 2338Z 149DEG 4KT 3261 11097

$$

685 
WWUS55 KTWC 232354 RRA
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
454 PM MST MON JUL 23 2012

AZC021-240005-
/O.EXP.KTWC.SV.W.0033.000000T0000Z-120724T0000Z/
PINAL AZ-
454 PM MST MON JUL 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PINAL COUNTY
WILL EXPIRE AT 500 PM MST...

THE VERY LOCALIZED SEVERE THUNDERSTORM THAT PROMTED THE SEVERE 
THUNDERSTORM WARNING HAS SIGNIFICANTLY WEAKENED...AND IS NO LONGER 
SEVERE. THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO EXPIRE 
AT 500 PM MST.

LAT...LON 3266 11115 3272 11090 3256 11084 3252 11104
TIME...MOT...LOC 2355Z 149DEG 4KT 3263 11098

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 5:10 PM MST	Special Weather Statement	TWC	Cochise	35 min
Jul 22, 8:44 PM MST	Areal Flood Warning	TWC	Pima	4 hr
Jul 23, 12:28 PM MST	Special Weather Statement	TWC		47 min
Jul 23, 2:49 PM MST	Special Weather Statement	TWC		41 min
Jul 23, 3:18 PM MST	Special Weather Statement	TWC		42 min
Jul 23, 3:37 PM MST	Special Weather Statement	TWC	Pinal	23 min
Jul 23, 4:25 PM MST	Severe Thunderstorm Warning	TWC	Pima	35 min
Jul 23, 4:35 PM MST	Severe Thunderstorm Warning	TWC	Pima	25 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2012 Every 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.