Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 40, NWS Tucson, AZ

July 30, 2012Graham County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 30, 2012, 9:40 PM MST for Graham County, Arizona. It was in force for 38 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: Jul 30, 2012, 9:40 PM MST (04:40 UTC)
Expired: Jul 30, 2012, 10:18 PM MST
In force: 38 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Graham County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 4.7 hours before the alert went out and 123 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3008 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 57 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.

758 
WUUS55 KTWC 310440
SVRTWC
AZC009-310530-
/O.NEW.KTWC.SV.W.0040.120731T0440Z-120731T0530Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
940 PM MST MON JUL 30 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN GRAHAM COUNTY IN SOUTHEAST ARIZONA...
  THIS INCLUDES THE CITY OF SAFFORD...

* UNTIL 1030 PM MST

* AT 937 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 5 MILES SOUTHEAST OF SAFFORD...
  AND MOVING NORTHWEST AT 20 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SOLOMON...SWIFT TRAIL JUNCTION...THATCHER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXPECT DAMAGING WINDS IN EXCESS OF 60 MPH...LARGE HAIL...FREQUENT 
LIGHTNING...AND HEAVY RAIN WITH THIS STORM.

&&

LAT...LON 3273 11017 3301 10962 3280 10944 3260 10959
TIME...MOT...LOC 0439Z 119DEG 29KT 3274 10962

$$

MEYER

2 follow-up statements

350 
WWUS55 KTWC 310457
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
957 PM MST MON JUL 30 2012

AZC009-310530-
/O.CON.KTWC.SV.W.0040.000000T0000Z-120731T0530Z/
GRAHAM AZ-
957 PM MST MON JUL 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM MST
FOR SOUTHERN GRAHAM COUNTY...

AT 955 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR SAFFORD...MOVING
NORTHWEST AT 20 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXPECT DAMAGING WINDS IN EXCESS OF 60 MPH...LARGE HAIL...FREQUENT 
LIGHTNING...AND HEAVY RAIN WITH THIS STORM.

&&

LAT...LON 3273 11017 3301 10962 3280 10944 3260 10959
TIME...MOT...LOC 0457Z 119DEG 29KT 3283 10974

$$

MEYER

223 
WWUS55 KTWC 310518
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
1018 PM MST MON JUL 30 2012

AZC009-310526-
/O.CAN.KTWC.SV.W.0040.000000T0000Z-120731T0530Z/
GRAHAM AZ-
1018 PM MST MON JUL 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN GRAHAM COUNTY IS
CANCELLED...

AT 1015 PM MST THE AREA OF THUNDERSTORMS NEAR SAFFORD HAD WEAKENED.

LAT...LON 3273 11017 3301 10962 3280 10944 3260 10959
TIME...MOT...LOC 0516Z 119DEG 29KT 3290 10990

$$

MEYER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 6:56 PM MST	Special Weather Statement	TWC	Cochise	49 min
Jul 30, 7:27 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 30, 7:29 PM MST	Flash Flood Warning	TWC	Cochise	2 hr
Jul 30, 8:34 PM MST	Special Weather Statement	TWC	Cochise	41 min
Jul 30, 9:14 PM MST	Special Weather Statement	TWC	Graham	46 min
Jul 30, 9:17 PM MST	Special Weather Statement	TWC	Cochise	28 min
Jul 30, 9:42 PM MST	Flash Flood Warning	TWC	Cochise	2 hr
Jul 30, 9:48 PM MST	Special Weather Statement	TWC	Greenlee	42 min
Jul 30, 10:39 PM MST	Special Weather Statement	TWC	Santa Cruz	51 min
Jul 30, 11:16 PM MST	Special Weather Statement	TWC		44 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2012 Every 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.