Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 2, NWS Phoenix, AZ

May 9, 2012Maricopa County, Pinal County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at May 9, 2012, 4:24 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 51 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 9, 2012, 4:24 PM MST (23:24 UTC)
Expired: May 9, 2012, 5:15 PM MST
In force: 51 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon

Counties Maricopa County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 31 km from the middle of the area, began a volume at 23:24 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.

What was reported inside it

Time	Report	Where	Remark
May 9, 4:35 PM MST	TSTM WND DMG	5 E Queen Creek, AZ	MOBILE HOMES OFF FOUNDATIONS. POWER LINES DOWN. GERMAIN AND IRONWOOD.
May 9, 4:37 PM MST	HAIL 0.25	Apache Junction, AZ

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 11.4 hours before the alert went out and 118 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: 156 J/kg
Mixed-layer CIN: -387 J/kg
Mixed-layer LCL: 2533 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 42 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.

689 
WUUS55 KPSR 092324
SVRPSR
AZC013-021-100015-
/O.NEW.KPSR.SV.W.0002.120509T2324Z-120510T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
424 PM MST WED MAY 9 2012

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA...
  NORTH CENTRAL PINAL COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITIES OF...SUPERIOR...FLORENCE...APACHE
  JUNCTION...

* UNTIL 515 PM MST

* AT 419 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING NICKEL SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM APACHE JUNCTION TO FLORENCE
  JUNCTION TO 7 MILES SOUTHWEST OF SUPERIOR...OR ALONG A LINE
  EXTENDING FROM APACHE JUNCTION TO 14 MILES WEST OF SUPERIOR TO 7
  MILES SOUTHWEST OF SUPERIOR...AND MOVING SOUTHWEST AT 25 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  PHOENIX MESA GATEWAY AIRPORT...QUEEN CREEK...SAN TAN VALLEY...
  MAGMA...CHANDLER HEIGHTS...SEVILLE AND SAN TAN MOUNTAIN PARK

LAT...LON 3309 11117 3294 11139 3304 11169 3317 11182
      3349 11146 3326 11097
TIME...MOT...LOC 2325Z 056DEG 23KT 3335 11154 3324 11139
          3317 11120

$$

21

2 follow-up statements

041 
WWUS55 KPSR 092352
SVSPSR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
452 PM MST WED MAY 9 2012

AZC013-021-100015-
/O.CON.KPSR.SV.W.0002.000000T0000Z-120510T0015Z/
PINAL AZ-MARICOPA AZ-
452 PM MST WED MAY 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MST
FOR EAST CENTRAL MARICOPA AND NORTH CENTRAL PINAL COUNTIES...

AT 447 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING NICKEL
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM QUEEN CREEK TO MAGMA TO
FLORENCE...OR ALONG A LINE EXTENDING FROM 8 MILES SOUTHEAST OF
GILBERT TO 11 MILES NORTHWEST OF FLORENCE TO FLORENCE...MOVING
SOUTHWEST AT 25 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SEVILLE...CHANDLER HEIGHTS...SAN TAN MOUNTAIN PARK AND VALLEY FARMS

SEVERAL BOUNDARIES HAVE NEARLY STALLED OVER THE WARNED 
AREA...SLOWING THE STORM MOTION...YIELDING THE POTENTIAL FOR PERIODS 
OF HEAVY RAINFALL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3343 11151 3320 11104 3309 11117 3294 11139
      3304 11169 3317 11182
TIME...MOT...LOC 2350Z 056DEG 23KT 3324 11169 3314 11154
          3307 11135

$$

21

164 
WWUS55 KPSR 100014
SVSPSR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
514 PM MST WED MAY 9 2012

AZC013-021-100023-
/O.EXP.KPSR.SV.W.0002.000000T0000Z-120510T0015Z/
PINAL AZ-MARICOPA AZ-
514 PM MST WED MAY 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MARICOPA AND
NORTH CENTRAL PINAL COUNTIES WILL EXPIRE AT 515 PM MST...

GUSTY WINDS TO 40 MPH WILL STILL BE POSSIBLE WITH THESE DECAYING 
THUNDERSTORMS. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT 
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE 
FORECAST OFFICE.

LAT...LON 3343 11151 3320 11104 3309 11117 3294 11139
      3304 11169 3317 11182
TIME...MOT...LOC 0013Z 056DEG 23KT 3314 11183 3304 11167
          3298 11148

$$

21

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 3:46 PM MST	Special Weather Statement	PSR		44 min
May 9, 4:07 PM MST	Special Weather Statement	PSR	Pinal	53 min
May 9, 4:08 PM MST	Special Weather Statement	PSR	Maricopa	37 min
May 9, 4:20 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	40 min
May 9, 4:36 PM MST	Dust Storm Warning	PSR		2 hr
May 9, 4:56 PM MST	Special Weather Statement	PSR	Maricopa	49 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.