Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 34, NWS Tucson, AZ

July 23, 2012Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 23, 2012, 4:35 PM MST for Pima County, Arizona. It was in force for 25 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, 4:35 PM MST (23:35 UTC)
Expired: Jul 23, 2012, 5:00 PM MST
In force: 25 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pima County, AZ

The radar

The Tucson radar (KEMX), 54 km from the middle of the area, began a volume at 23:35 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, 11.6 hours before the alert went out and 21 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.

875 
WUUS55 KTWC 232335
SVRTWC
AZC019-240000-
/O.NEW.KTWC.SV.W.0034.120723T2335Z-120724T0000Z/

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

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN PIMA COUNTY IN SOUTH CENTRAL ARIZONA...

* UNTIL 500 PM MST

* AT 430 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 NEAR SABINO CANYON...OR 9 MILES
  NORTHEAST OF TUCSON...AND MOVING NORTH 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 3245 11092 3242 11063 3220 11073 3224 11094
TIME...MOT...LOC 2335Z 194DEG 9KT 3230 11080

$$

MOLLERE

2 follow-up statements

011 
WWUS55 KTWC 232343
SVSTWC

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

AZC019-240000-
/O.CON.KTWC.SV.W.0034.000000T0000Z-120724T0000Z/
PIMA AZ-
443 PM MST MON JUL 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM MST
FOR NORTHEASTERN PIMA COUNTY...

AT 436 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 SNYDER ROAD AND 
BEAR CANYON ROAD.  

THIS STORM WAS LOCATED IN THE CATALINA FOOTHILLS...OR 10 MILES 
NORTHEAST OF TUCSON...MOVING NORTH AT 5 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 3245 11092 3242 11063 3220 11073 3224 11094
TIME...MOT...LOC 2343Z 195DEG 6KT 3231 11079

$$

416 
WWUS55 KTWC 232355
SVSTWC

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

AZC019-240006-
/O.EXP.KTWC.SV.W.0034.000000T0000Z-120724T0000Z/
PIMA AZ-
455 PM MST MON JUL 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PIMA 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 3245 11092 3242 11063 3220 11073 3224 11094
TIME...MOT...LOC 2356Z 195DEG 6KT 3233 11078

$$

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, 4:28 PM MST	Severe Thunderstorm Warning	TWC	Pinal	32 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.