Alert archive / Arizona / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 79, NWS Tucson, AZ

August 12, 2011Graham County, Greenlee County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 12, 2011, 5:33 PM MST for Graham County, Greenlee County, Arizona. It was in force for 42 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 12, 2011, 5:33 PM MST (00:33 UTC)
Expired
Aug 12, 2011, 6:15 PM MST
In force
42 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon

Counties Graham County, AZ, Greenlee County, AZ

The radar

The Tucson radar (KEMX), 171 km from the middle of the area, began a volume at 00:35 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 00:00Z, 0.6 hours before the alert went out and 175 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 00:00Z on 2011-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 90 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 00:00Z on 2011-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
90 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
1450 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
71 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.

055 
WUUS55 KTWC 130033
SVRTWC
AZC009-011-130115-
/O.NEW.KTWC.SV.W.0079.110813T0033Z-110813T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
533 PM MST FRI AUG 12 2011

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL GRAHAM COUNTY IN SOUTHEAST ARIZONA...
  SOUTHERN GREENLEE COUNTY IN SOUTHEAST ARIZONA...

* UNTIL 615 PM MST

* AT 524 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM CLIFTON TO GUTHRIE TO 15 MILES SOUTHEAST OF CLIFTON NEAR
  HIGHWAY 191 AND MOVING WEST AT 5 TO 8 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MORENCI

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 3273 10929 3285 10946 3301 10951 3311 10920
      3295 10911 3290 10903 3282 10904
TIME...MOT...LOC 0031Z 070DEG 5KT 3300 10926 3292 10921
          3288 10914

$$

MEYER
1 follow-up statement
156 
WWUS55 KTWC 130115
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
615 PM MST FRI AUG 12 2011

AZC009-011-130125-
/O.EXP.KTWC.SV.W.0079.000000T0000Z-110813T0115Z/
GRAHAM AZ-GREENLEE AZ-
615 PM MST FRI AUG 12 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN GREENLEE AND EAST
CENTRAL GRAHAM COUNTIES HAS EXPIRED...

AT 615 PM MST THE THUNDERSTORMS IN SOUTHERN GREENLEE COUNTY HAD 
DIMINISHED TO BELOW SEVERE LEVELS. LOCALLY HEAVY RAINFALL MAY STILL 
GENERATE SOME FLOODING ISSUES.

LAT...LON 3273 10929 3285 10946 3301 10951 3311 10920
      3295 10911 3290 10903 3282 10904
TIME...MOT...LOC 0115Z 070DEG 5KT 3298 10933 3290 10928
          3286 10921

$$

MEYER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 5:50 PM MSTAreal Flood AdvisoryTWCGraham, Greenlee115 min
Aug 12, 6:19 PM MSTAreal Flood AdvisoryTWCSanta Cruz116 min
Aug 12, 6:58 PM MSTSevere Thunderstorm WarningTWCCochise, Graham62 min
Aug 12, 7:33 PM MSTAreal Flood AdvisoryTWCCochise, Graham117 min
Aug 12, 8:27 PM MSTSpecial Weather StatementTWCCochise48 min
Aug 13, 2:21 PM MSTFlash Flood WarningTWCCochise84 min
Aug 13, 3:21 PM MSTSevere Thunderstorm WarningTWCCochise39 min
Aug 13, 3:55 PM MSTAreal Flood AdvisoryTWCCochise2 hr

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.