Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 62, NWS Tucson, AZ

August 11, 2012Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 11, 2012, 3:45 PM MST for Pima County, Arizona. It was in force for 45 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, 3:45 PM MST (22:45 UTC)
Expired: Aug 11, 2012, 4:30 PM MST
In force: 45 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pima County, AZ

The radar

The Tucson radar (KEMX), 123 km from the middle of the area, began a volume at 22:46 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 (KDMA), launched 12:00Z, 10.8 hours before the alert went out and 107 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: 144 J/kg
Mixed-layer CIN: -298 J/kg
Mixed-layer LCL: 2512 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 34 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.

101 
WUUS55 KTWC 112245
SVRTWC
AZC019-112330-
/O.NEW.KTWC.SV.W.0062.120811T2245Z-120811T2330Z/

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

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL PIMA COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITY OF SELLS...

* UNTIL 430 PM MST

* AT 338 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 14 MILES SOUTHEAST OF SELLS...
  AND MOVING NORTHWEST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  VAMORI...TOPAWA...ARTESA...COWLIC AND BIG FIELDS.

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 3163 11201 3201 11219 3190 11180 3149 11156
TIME...MOT...LOC 2244Z 137DEG 16KT 3176 11180

$$

1 follow-up statement

978 
WWUS55 KTWC 112328
SVSTWC

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

AZC019-112339-
/O.EXP.KTWC.SV.W.0062.000000T0000Z-120811T2330Z/
PIMA AZ-
428 PM MST SAT AUG 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PIMA COUNTY WILL
EXPIRE AT 430 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 NOW IN EFFECT UNTIL 7 PM MST. 

LAT...LON 3163 11201 3201 11219 3190 11180 3149 11156
TIME...MOT...LOC 2329Z 137DEG 16KT 3191 11196

$$

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, 4:09 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Aug 11, 4:19 PM MST	Severe Thunderstorm Warning	TWC	Pima	26 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.