Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 98, NWS Tucson, AZ

September 2, 2012Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Sep 2, 2012, 4:47 PM MST for Pima County, Arizona. It was in force for 43 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, 4:47 PM MST (23:47 UTC)
Expired
Sep 2, 2012, 5:30 PM MST
In force
43 min
Issued by
NWS Tucson, AZ
Area
Storm-based polygon

County Pima County, AZ

The radar

The Tucson radar (KEMX), 67 km from the middle of the area, began a volume at 23:49 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, 11.8 hours before the alert went out and 38 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.

516 
WUUS55 KTWC 022347
SVRTWC
AZC019-030030-
/O.NEW.KTWC.SV.W.0098.120902T2347Z-120903T0030Z/

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

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 530 PM MST

* AT 444 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
  EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR AND EAST OF
  THREE POINTS...OR 15 MILES SOUTHWEST OF TUCSON...AND MOVING WEST AT
  5 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER INDOORS. EXPECT DAMAGING WINDS IN EXCESS OF 70 MPH...
LARGE HAIL...FREQUENT LIGHTNING...AND HEAVY RAIN WITH THIS STORM.

&&

LAT...LON 3199 11142 3226 11142 3223 11110 3205 11110
TIME...MOT...LOC 2347Z 090DEG 4KT 3214 11120

$$

MEYER
2 follow-up statements
063 
WWUS55 KTWC 022355
SVSTWC

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

AZC019-030030-
/O.CON.KTWC.SV.W.0098.000000T0000Z-120903T0030Z/
PIMA AZ-
455 PM MST SUN SEP 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MST
FOR CENTRAL PIMA COUNTY...

AT 453 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR RYAN FIELD 
EXTENDING WEST ALONG HIGHWAY 86 TOWARD THREE POINTS...OR ABOUT 12 TO 
20 MILES SOUTHWEST OF TUCSON...MOVING WEST AT 5 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER INDOORS. EXPECT DAMAGING WINDS IN EXCESS OF 70 MPH...
LARGE HAIL...FREQUENT LIGHTNING...AND HEAVY RAIN WITH THIS STORM.

&&

LAT...LON 3199 11142 3226 11142 3223 11110 3205 11110
TIME...MOT...LOC 2353Z 090DEG 4KT 3213 11120

$$

MEYER
043 
WWUS55 KTWC 030030
SVSTWC

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

AZC019-030040-
/O.EXP.KTWC.SV.W.0098.000000T0000Z-120903T0030Z/
PIMA AZ-
530 PM MST SUN SEP 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL PIMA COUNTY HAS
EXPIRED...

AT 530 PM MST THE THUNDERSTORM BETWEEN RYAN FIELD AND THREE POINTS 
NOW NORTH OF HIGHWAY 86 HAD DIMINISHED IN INTENSITY AND SPREAD NORTH 
OF THE AREA.

LAT...LON 3199 11142 3226 11142 3223 11110 3205 11110
TIME...MOT...LOC 0030Z 090DEG 4KT 3213 11125

$$

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, 3:25 PM MSTSevere Thunderstorm WarningTWCPima, Pinal50 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

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.