Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 63, NWS Tucson, AZ

August 11, 2012Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 11, 2012, 4:19 PM MST for Pima County, Arizona. It was in force for 26 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: Aug 11, 2012, 4:19 PM MST (23:19 UTC)
Expired: Aug 11, 2012, 4:45 PM MST
In force: 26 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pima County, AZ

The radar

The Phoenix radar (KIWA), 127 km from the middle of the area, began a volume at 23:21 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

Phoenix, AZ (KPSR), launched 12:00Z, 11.3 hours before the alert went out and 125 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: 270 J/kg
Mixed-layer CIN: -371 J/kg
Mixed-layer LCL: 2845 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -80 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

177 
WUUS55 KTWC 112319
SVRTWC
AZC019-112345-
/O.NEW.KTWC.SV.W.0063.120811T2319Z-120811T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
419 PM MST SAT AUG 11 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 445 PM MST

* AT 413 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 HICKIWAN...OR 43 MILES
  SOUTH OF GILA BEND...AND MOVING NORTH 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 3250 11273 3250 11234 3228 11233 3227 11255
TIME...MOT...LOC 2319Z 173DEG 8KT 3237 11246

$$

1 follow-up statement

561 
WWUS55 KTWC 112342
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
442 PM MST SAT AUG 11 2012

AZC019-112352-
/O.EXP.KTWC.SV.W.0063.000000T0000Z-120811T2345Z/
PIMA AZ-
442 PM MST SAT AUG 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL PIMA COUNTY WILL
EXPIRE AT 445 PM MST...

THE STORM THAT PROMPTED THE WARNING HAD DECREASED BELOW SEVERE 
LEVELS. HOWEVER...HEAVY RAINFALL CONTINUED ACROSS THE AREA. A SMALL 
STREAM FLOOD ADVISORY IS IN EFFECT UNTIL 7 PM MST. 

LAT...LON 3250 11273 3250 11234 3228 11233 3227 11255
TIME...MOT...LOC 2342Z 173DEG 8KT 3242 11247

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 5:05 PM MST	Severe Thunderstorm Warning	TWC	Pima	25 min
Aug 10, 5:32 PM MST	Severe Thunderstorm Warning	TWC	Pima	43 min
Aug 10, 6:23 PM MST	Special Weather Statement	TWC	Pima	52 min
Aug 11, 1:19 AM MST	Special Weather Statement	TWC	Pima	41 min
Aug 11, 2:02 PM MST	Special Weather Statement	TWC	Pima	43 min
Aug 11, 2:38 PM MST	Severe Thunderstorm Warning	TWC	Pima	22 min
Aug 11, 3:35 PM MST	Severe Thunderstorm Warning	TWC	Pima	40 min
Aug 11, 3:41 PM MST	Severe Thunderstorm Warning	TWC	Pima	34 min
Aug 11, 3:45 PM MST	Severe Thunderstorm Warning	TWC	Pima	45 min
Aug 11, 4:09 PM MST	Areal Flood Advisory	TWC	Pima	3 hr

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.