Alert archive / Arizona / Tornado Warnings in 2011

Tornado Warning 1, NWS Phoenix, AZ

September 10, 2011Maricopa County, Pinal County, Arizona

NWS Phoenix, AZ issued this tornado warning at Sep 10, 2011, 6:05 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 15 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 10, 2011, 6:05 PM MST (01:05 UTC)
Expired: Sep 10, 2011, 6:20 PM MST
In force: 15 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon

Counties Maricopa County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 38 km from the middle of the area, began a volume at 01:06 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

Phoenix, AZ (KPSR), launched 00:00Z, 1.1 hours before the alert went out and 43 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: 1001 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 2449 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

711 
WFUS55 KPSR 110105
TORPSR
AZC013-021-110130-
/O.NEW.KPSR.TO.W.0001.110911T0105Z-110911T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
605 PM MST SAT SEP 10 2011

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA...
  EXTREME NORTH CENTRAL PINAL COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITY OF APACHE JUNCTION...

* UNTIL 630 PM MST

* AT 557 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES
  NORTHWEST OF APACHE JUNCTION...MOVING NORTHEAST AT 15 MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT A TORNADO IS ALREADY ON THE GROUND OR
WILL DEVELOP VERY SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS
STORM GET INSIDE A STRONG BUILDING IMMEDIATELY! GO TO AN INTERIOR
HALLWAY OR ROOM SUCH AS A CLOSET OR BATHROOM AND STAY AWAY FROM
WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

&&

LAT...LON 3380 11159 3368 11132 3337 11156 3345 11176
TIME...MOT...LOC 0106Z 207DEG 13KT 3349 11161

$$

HV

2 follow-up statements

556 
WWUS55 KPSR 110116
SVSPSR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
616 PM MST SAT SEP 10 2011

AZC013-021-110130-
/O.CON.KPSR.TO.W.0001.000000T0000Z-110911T0130Z/
PINAL AZ-MARICOPA AZ-
616 PM MST SAT SEP 10 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM MST FOR EAST
CENTRAL MARICOPA AND EXTREME NORTH CENTRAL PINAL COUNTIES...

AT 606 PM MST...WEATHER RADAR DETECTED A THUNDERSTORM WITH A 
ROTATING UPDRAFT CHARACTERISTIC OF A TORNADO. THE SEVERE 
THUNDERSTORM GENERALLY MOVED NORTH INTO THE USERY MOUNTAIN AREA... 
NORTH OF MESA...ALMOST FOLLOWING THE USERY PASS ROAD TOWARD THE 
POPULAR SALT RIVER TUBING AREA.  

THIS TORNADO WAS LOCATED 7 MILES NORTHWEST OF APACHE JUNCTION... 
MOVING NORTHEAST AT 15 MPH.

THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED COUNTY.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE.

LAT...LON 3380 11159 3368 11132 3337 11156 3345 11176
TIME...MOT...LOC 0112Z 207DEG 13KT 3351 11160

$$

HV

075 
WWUS55 KPSR 110120
SVSPSR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
620 PM MST SAT SEP 10 2011

AZC013-021-110129-
/O.CAN.KPSR.TO.W.0001.000000T0000Z-110911T0130Z/
PINAL AZ-MARICOPA AZ-
620 PM MST SAT SEP 10 2011

...THE TORNADO WARNING FOR EAST CENTRAL MARICOPA AND EXTREME NORTH
CENTRAL PINAL COUNTIES IS CANCELLED...

AT 618 PM THE TORNADIC VORTEX SIGNITURE SEEN ON RADAR HAD 
DISSIPATED. HOWEVER...STRONG THUNDERSTORMS...A FEW SEVERE...WILL 
CONTINUE TO DEVELOP ACROSS PARTS OF EAST MARICOPA AND NORTHERN PINAL 
COUNTIES THE REMAINDER OF THE AFTERNOON.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE.

LAT...LON 3380 11159 3368 11132 3337 11156 3345 11176
TIME...MOT...LOC 0119Z 207DEG 13KT 3353 11158

$$

HV

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 5:15 PM MST	Special Weather Statement	PSR	Gila	45 min
Sep 10, 5:34 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	56 min
Sep 10, 5:56 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	34 min
Sep 10, 6:30 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	45 min
Sep 10, 7:07 PM MST	Dust Storm Warning	PSR		53 min
Sep 10, 7:16 PM MST	Special Weather Statement	PSR	Pinal	74 min
Sep 10, 7:17 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	25 min
Sep 10, 7:41 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	2 hr
Sep 10, 7:48 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	27 min
Sep 10, 7:56 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	22 min
Sep 10, 8:29 PM MST	Areal Flood Advisory	PSR	Gila, Maricopa	2 hr
Sep 10, 8:29 PM MST	Special Weather Statement	PSR	Maricopa	46 min
Sep 11, 1:27 PM MST	Special Weather Statement	PSR	Maricopa	48 min
Sep 11, 2:22 PM MST	Special Weather Statement	PSR	Maricopa	38 min
Sep 11, 3:01 PM MST	Special Weather Statement	PSR	Maricopa	44 min
Sep 11, 3:11 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	49 min
Sep 11, 3:21 PM MST	Special Weather Statement	PSR	Maricopa	39 min
Sep 11, 3:27 PM MST	Special Weather Statement	PSR	Maricopa	48 min
Sep 11, 3:59 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	21 min
Sep 11, 4:13 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	38 min
Sep 11, 4:28 PM MST	Special Weather Statement	PSR	Gila	47 min
Sep 11, 4:47 PM MST	Special Weather Statement	PSR	La Paz	43 min

Nearby

Tornado Warnings in Arizona, 2011 Every tornado warning in 2011 Tornadoes 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.