Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 91, NWS Tucson, AZ

August 21, 2012Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 21, 2012, 4:15 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 21, 2012, 4:15 PM MST (23:15 UTC)
Expired: Aug 21, 2012, 5:00 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), 56 km from the middle of the area, began a volume at 23:14 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, 11.3 hours before the alert went out and 18 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: 1386 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1261 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 32 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.

819 
WUUS55 KTWC 212315
SVRTWC
AZC019-220000-
/O.NEW.KTWC.SV.W.0091.120821T2315Z-120822T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
415 PM MST TUE AUG 21 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 500 PM MST

* AT 406 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 SOUTH TUCSON...OR 7 MILES
  SOUTHWEST OF TUCSON...AND MOVING NORTH AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SAGUARO NATIONAL PARK WEST

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 3230 11122 3230 11097 3207 11092 3210 11110
TIME...MOT...LOC 2314Z 169DEG 7KT 3219 11105

$$

1 follow-up statement

458 
WWUS55 KTWC 212358
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
458 PM MST TUE AUG 21 2012

AZC019-220005-
/O.EXP.KTWC.SV.W.0091.000000T0000Z-120822T0000Z/
PIMA AZ-
458 PM MST TUE AUG 21 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PIMA COUNTY WILL
EXPIRE AT 500 PM MST...

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORMS WARNING HAS 
WEAKENED BELOW SEVERE LEVELS AND HAS BEEN ALLOWED TO EXPIRE AT 5 PM 
MST.

HOWEVER...A STRONG THUNDERSTORM CONTINUES NEAR THE INTERSECTION OF 
MILE WIDE ROAD AND KINNEY ROAD. GUSTY WINDS TO 50 MPH..SMALL HAIL 
AND VERY HEAVY RAINFALL IS POSSIBLE WITH THIS STORM.

LAT...LON 3230 11122 3230 11097 3207 11092 3210 11110
TIME...MOT...LOC 2355Z 149DEG 8KT 3225 11117

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 5:59 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Aug 20, 6:10 PM MST	Areal Flood Advisory	TWC	Pima	80 min
Aug 20, 7:26 PM MST	Areal Flood Advisory	TWC	Pima	109 min
Aug 20, 7:40 PM MST	Special Weather Statement	TWC	Pima	50 min
Aug 21, 12:17 PM MST	Severe Thunderstorm Warning	TWC	Graham	28 min
Aug 21, 1:04 PM MST	Severe Thunderstorm Warning	TWC	Pinal	26 min
Aug 21, 2:10 PM MST	Special Weather Statement	TWC	Cochise	50 min
Aug 21, 2:49 PM MST	Flash Flood Warning	TWC	Pima	86 min
Aug 21, 3:12 PM MST	Special Weather Statement	TWC		48 min
Aug 21, 3:28 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	47 min
Aug 21, 3:34 PM MST	Severe Thunderstorm Warning	TWC	Pima	41 min
Aug 21, 3:53 PM MST	Areal Flood Advisory	TWC	Pima	112 min
Aug 21, 4:34 PM MST	Areal Flood Advisory	TWC	Pima	116 min
Aug 21, 4:42 PM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	2 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.