Alert archive / Arizona / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 113, NWS Tucson, AZ

August 27, 2011Pima County, Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 27, 2011, 3:15 PM MST for Pima County, Pinal 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 27, 2011, 3:15 PM MST (22:15 UTC)
Expired
Aug 27, 2011, 4:00 PM MST
In force
45 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon

Counties Pima County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 89 km from the middle of the area, began a volume at 22:16 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, 10.3 hours before the alert went out and 58 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-pSkew-T log-p diagram, Tuscon, AZ at 12:00Z on 2011-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 296 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 12:00Z on 2011-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
296 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
2675 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
72 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.

329 
WUUS55 KTWC 272215
SVRTWC
AZC019-021-272300-
/O.NEW.KTWC.SV.W.0113.110827T2215Z-110827T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
315 PM MST SAT AUG 27 2011

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 400 PM MST

* AT 307 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 11 MILES EAST OF AVRA VALLEY...
  OR NEAR MARANA...AND MOVING WEST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RED  
  ROCK AND PICACHO PEAK AND INTERSTATE 10.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ENCOUNTER STRONG WINDS...BLOWING DUST AND POOR VISIBILITIES
WHILE DRIVING...PULL OFF THE ROAD IF POSSIBLE...PUT THE VEHICLE IN
PARK...TAKE YOUR FOOT OFF THE BRAKE AND WAIT UNTIL THE VISIBILITY
IMPROVES. PROTECT YOUR HEAD FROM POSSIBLE FLYING DEBRIS.

&&

LAT...LON 3241 11153 3282 11144 3264 11105 3243 11110
TIME...MOT...LOC 2215Z 087DEG 9KT 3249 11117

$$
2 follow-up statements
571 
WWUS55 KTWC 272224
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
324 PM MST SAT AUG 27 2011

AZC019-021-272300-
/O.CON.KTWC.SV.W.0113.000000T0000Z-110827T2300Z/
PIMA AZ-PINAL AZ-
324 PM MST SAT AUG 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM MST
FOR SOUTH CENTRAL PINAL AND NORTH CENTRAL PIMA COUNTIES...

AT 311 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATED A COUPLE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING 
DAMAGING WINDS IN EXCESS OF 60 MPH.  THE SOUTHERN MOST STORM WAS 
LOCATED 10 MILES EAST OF AVRA VALLEY...OR NEAR MARANA...MOVING WEST 
AT 10 MPH. THIS STORM HAD A HISTORY OF PRODUCING DAMAGING WINDS 
AROUND THE DOVE MOUNTAIN AREA. THE OTHER SEVERE THUNDERSTORM WAS 
LOCATED EAST TO SOUTHEAST OF PICACHO PEAK...MOVING WEST AT 10 MPH. 
BOTH STORMS WILL LIKELY PRODUCE AREAS OF BLOWING DUST THAT WILL 
IMPACT MOTORISTS ON INTERSTATE 10 BETWEEN MARANA AND ELOY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ENCOUNTER STRONG WINDS...BLOWING DUST AND POOR VISIBILITIES
WHILE DRIVING...PULL OFF THE ROAD IF POSSIBLE...PUT THE VEHICLE IN
PARK...TAKE YOUR FOOT OFF THE BRAKE AND WAIT UNTIL THE VISIBILITY
IMPROVES. PROTECT YOUR HEAD FROM POSSIBLE FLYING DEBRIS.

&&

LAT...LON 3241 11153 3282 11144 3264 11105 3243 11110
TIME...MOT...LOC 2220Z 087DEG 9KT 3249 11118

$$
585 
WWUS55 KTWC 272254
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
354 PM MST SAT AUG 27 2011

AZC019-021-272302-
/O.EXP.KTWC.SV.W.0113.000000T0000Z-110827T2300Z/
PIMA AZ-PINAL AZ-
354 PM MST SAT AUG 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PINAL AND NORTH
CENTRAL PIMA COUNTIES WILL EXPIRE AT 400 PM MST...

THE STORMS THAT PROMPTED THE WARNING HAD DIMINISHED SIGNIFICANTLY IN 
INTENSITY. THUS...THE THREAT OF WINDS IN EXCESS OF 60 MPH HAD ENDED. 
THE WARNING WILL EXPIRE AT 400 PM MST. 

LAT...LON 3241 11153 3282 11144 3264 11105 3243 11110
TIME...MOT...LOC 2252Z 087DEG 9KT 3249 11127

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 26, 5:13 PM MSTSpecial Weather StatementTWCPinal62 min
Aug 26, 6:49 PM MSTSpecial Weather StatementTWCSanta Cruz41 min
Aug 26, 7:31 PM MSTSpecial Weather StatementTWCSanta Cruz44 min
Aug 27, 3:40 PM MSTSevere Thunderstorm WarningTWCPima35 min
Aug 27, 3:51 PM MSTSevere Thunderstorm WarningTWCPima39 min
Aug 27, 3:57 PM MSTSevere Thunderstorm WarningTWCPima33 min
Aug 27, 4:20 PM MSTSevere Thunderstorm WarningTWCPima40 min
Aug 27, 4:22 PM MSTSevere Thunderstorm WarningTWCPima38 min
Aug 27, 4:30 PM MSTSevere Thunderstorm WarningTWCPima45 min
Aug 27, 4:31 PM MSTSevere Thunderstorm WarningTWCPima29 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2011Every severe thunderstorm warning in 2011

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.