Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 95, NWS Tucson, AZ

September 2, 2012Pima County, Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Sep 2, 2012, 3:25 PM MST for Pima County, Pinal County, Arizona. It was in force for 50 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
Sep 2, 2012, 3:25 PM MST (22:25 UTC)
Expired
Sep 2, 2012, 4:15 PM MST
In force
50 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon

Counties Pima County, AZ, Pinal County, AZ

The radar

The Tucson radar (KEMX), 69 km from the middle of the area, began a volume at 22:25 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, 10.4 hours before the alert went out and 31 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 2012-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 166 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 2012-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 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
166 J/kg
Mixed-layer CIN
-271 J/kg
Mixed-layer LCL
2049 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
45 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.

169 
WUUS55 KTWC 022225
SVRTWC
AZC019-021-022315-
/O.NEW.KTWC.SV.W.0095.120902T2225Z-120902T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
325 PM MST SUN SEP 2 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN PIMA COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITY OF ORO VALLEY...
  EXTREME SOUTH CENTRAL PINAL COUNTY IN SOUTH CENTRAL ARIZONA...

* UNTIL 415 PM MST

* AT 318 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 ORO VALLEY...AND MOVING
  NORTHWEST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CATALINA AND DOVE MOUNTAIN.

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 3242 11116 3259 11101 3244 11077 3228 11093
TIME...MOT...LOC 2224Z 117DEG 3KT 3241 11098

$$

MEYER
1 follow-up statement
600 
WWUS55 KTWC 022246
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
346 PM MST SUN SEP 2 2012

AZC019-021-022315-
/O.CON.KTWC.SV.W.0095.000000T0000Z-120902T2315Z/
PIMA AZ-PINAL AZ-
346 PM MST SUN SEP 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM MST
FOR EXTREME SOUTH CENTRAL PINAL AND NORTHEASTERN PIMA COUNTIES...

AT 342 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE TWO SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING 
WINDS IN EXCESS OF 60 MPH IN THE ORO VALLEY AREA. THE FIRST STORM 
WAS LOCATED NEAR AND WEST OF ORO VALLEY...WITH A SECOND STORM JUST 
SOUTHEAST AND EAST OF ORO VALLEY NEAR CATALINA STATE PARK AND 
NORTHERN CATALINA FOOTHILLS. STORM MOVEMENT WAS TO THE NORTHWEST AT 
5 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER INDOORS. EXPECT DAMAGING WINDS IN EXCESS OF 60 MPH...
LARGE HAIL...FREQUENT LIGHTNING...AND HEAVY RAIN WITH THESE STORMS.

&&

LAT...LON 3242 11116 3259 11101 3244 11077 3228 11093
TIME...MOT...LOC 2244Z 117DEG 3KT 3244 11100

$$

MEYER

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 7:50 PM MSTAreal Flood AdvisoryTWCPima115 min
Sep 2, 2:10 PM MSTSpecial Weather StatementTWCSanta Cruz50 min
Sep 2, 3:19 PM MSTSpecial Weather StatementTWC56 min
Sep 2, 3:31 PM MSTSevere Thunderstorm WarningTWCPima44 min
Sep 2, 3:35 PM MSTAreal Flood AdvisoryTWCPima85 min
Sep 2, 3:43 PM MSTSpecial Weather StatementTWCPima47 min
Sep 2, 3:59 PM MSTAreal Flood AdvisoryTWCPima91 min
Sep 2, 4:15 PM MSTAreal Flood AdvisoryTWCPima, Santa Cruz3 hr
Sep 2, 4:15 PM MSTSevere Thunderstorm WarningTWCPima23 min
Sep 2, 4:47 PM MSTSevere Thunderstorm WarningTWCPima43 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2012Every 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.