Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS Flagstaff, AZ

October 12, 2012Gila County, Navajo County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Oct 12, 2012, 1:43 AM MST for Gila County, Navajo County, Arizona. It was in force for 32 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
Oct 12, 2012, 1:43 AM MST (08:43 UTC)
Expired
Oct 12, 2012, 2:15 AM MST
In force
32 min
Issued by
NWS Flagstaff, AZ
Area
Storm-based polygon

Counties Gila County, AZ, Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 80 km from the middle of the area, began a volume at 08:43 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

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 8.7 hours before the alert went out and 169 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, Flgstf/Belemont, AZ at 00:00Z on 2012-10-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 29 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 00:00Z on 2012-10-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 141 square meters per square second.1939587897Sfc1 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
29 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1607 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
141 m²/s²
0-3 km storm-relative helicity
371 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

519 
WUUS55 KFGZ 120843
SVRFGZ
AZC007-017-120915-
/O.NEW.KFGZ.SV.W.0049.121012T0843Z-121012T0915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
143 AM MST FRI OCT 12 2012

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL GILA COUNTY IN EAST CENTRAL ARIZONA...
  SOUTH CENTRAL NAVAJO COUNTY IN NORTHEAST ARIZONA...

* UNTIL 215 AM MST

* AT 139 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED SOUTH 
  SOUTHWESTNEAR CIBECUE...OR 30 MILES SOUTHEAST OF FOREST
  LAKES...AND MOVING NORTH   AT 55 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CIBDUE IN SOUTHERN NAVAJO COUNTY AT 150 AM MST

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME ROTATION WITHIN THIS STORM. 
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A 
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A 
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 3438 11051 3432 11025 3386 11045 3392 11066
TIME...MOT...LOC 0841Z 198DEG 49KT 3399 11052

$$
TC
1 follow-up statement
665 
WWUS55 KFGZ 120904
SVSFGZ

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
204 AM MST FRI OCT 12 2012

AZC007-017-120915-
/O.CON.KFGZ.SV.W.0049.000000T0000Z-121012T0915Z/
GILA AZ-NAVAJO AZ-
204 AM MST FRI OCT 12 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 AM MST
FOR SOUTH CENTRAL NAVAJO AND CENTRAL GILA COUNTIES...

AT 158 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 12 MILES NORTH OF CIBECUE...OR 23 MILES WEST OF SHOW LOW...
MOVING NORTHEAST AT 50 MPH.

THE SEVERE THUNDERSTORM WILL MOVE NORTHEAST AND MOVE UP BETWEEN CLAY 
SPRINGS AND ARIPINE BY AROUND 215 AM MST. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED ROTATION WITHIN THIS STORM. A TORNADO 
MAY STILL BE POSSIBLE WITH THIS STORM IF A TORNADO IS SPOTTED...ACT 
QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH 
AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 3438 11051 3432 11025 3386 11045 3392 11066
TIME...MOT...LOC 0901Z 204DEG 44KT 3423 11042

$$
TC

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 11, 9:03 PM MSTSevere Thunderstorm WarningFGZGila27 min
Oct 11, 9:24 PM MSTSevere Thunderstorm WarningFGZCoconino, Gila, Navajo36 min
Oct 12, 2:08 AM MSTTornado WarningFGZNavajo36 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.