Alert archive / Arizona / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 12, NWS Phoenix, AZ

June 29, 2015Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jun 29, 2015, 10:20 PM MST for Maricopa County, Arizona. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 29, 2015, 10:20 PM MST (05:20 UTC)
Expired: Jun 29, 2015, 10:45 PM MST
In force: 25 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 77 km from the middle of the area, began a volume at 05:23 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, 5.3 hours before the alert went out and 49 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: 855 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 2959 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Phoenix, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 29, 9:20 PM MST, 1 hour earlier.

Area forecast discussion, Jun 29, 9:20 PM MST, 1 hour before

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In the hours before

Special weather statement, Jun 29, 6:52 PM MST, 3 hours 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
652 PM MST MON JUN 29 2015

AZZ023-024-027-028-300300-
GREATER PHOENIX AREA AZ-NORTHWEST AND NORTH CENTRAL PINAL COUNTY AZ-
SOUTHERN GILA/TONTO NF FOOTHILLS AZ-SOUTHWEST MARICOPA COUNTY AZ-
652 PM MST MON JUN 29 2015

...SPECIAL WEATHER STATEMENT...

AT 646 PM MST...BLOWING DUST WAS MOVING THROUGH PINAL COUNTY
APPROACHING SOUTHERN PORTIONS OF METRO PHOENIX. REDUCED
VISIBILITIES...RANGING FROM ONE TO THREE MILES...CAN BE EXPECTED
BETWEEN 7 PM AND 8 PM.

LOCATIONS IMPACTED INCLUDE...
AHWATUKEE...CHANDLER...GILBERT...MESA...QUEEN CREEK...
TEMPE...AVONDALE...GOODYEAR...TOLLESON...BUCKEYE...LAVEEN...SUN
LAKES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

LOCALLY DENSE BLOWING DUST IS POSSIBLE.  IF YOU ENCOUNTER BLOWING
DUST WHILE DRIVING...PULL OVER AS FAR OFF THE ROADWAY AS POSSIBLE AND
PARK. TURN OFF YOUR HEADLIGHTS AND KEEP YOUR FOOT OFF THE BRAKE.

&&

LAT...LON 3343 11241 3349 11159 3321 11159 3320 11244
TIME...MOT...LOC 0146Z 035DEG 3KT 3319 11199

AJ

Special weather statement, Jun 29, 7:32 PM MST, 2 hours 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
732 PM MST MON JUN 29 2015

AZZ022>024-300330-
GREATER PHOENIX AREA AZ-NORTHWEST MARICOPA COUNTY AZ-
SOUTHERN GILA/TONTO NF FOOTHILLS AZ-
732 PM MST MON JUN 29 2015

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  NORTHWESTERN MARICOPA COUNTY

UNTIL 830 PM MST

AT 728 PM MST...NWS METEOROLOGISST WERE TRACKING A STRONG
THUNDERSTORMS FROM WICKENBURG TO NEAR LAKE PLEASANT.

WINDS OF 40 TO 50 MPH WILL BE POSSIBLE FROM THESE STORMS.

LOCATIONS IMPACTED INCLUDE...

PEORIA...SURPRISE...EL MIRAGE...
WICKENBURG...YOUNGTOWN...WITTMANN...SUN CITY...CIRCLE CITY...
NEW RIVER...CAVE CREEK...CAREFREE...MORRISTOWN.

LAT...LON 3402 11184 3401 11180 3365 11197 3357 11232
      3368 11305 3400 11317 3400 11273 3389 11228
      3391 11224 3395 11224 3397 11219 3405 11215
TIME...MOT...LOC 0228Z 290DEG 23KT 3386 11261

AJ

Special weather statement, Jun 29, 9:15 PM MST, 1 hour 5 minutes before

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Special weather statement, Jun 29, 9:53 PM MST, 27 minutes before

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Special weather statement, Jun 29, 10:07 PM MST, 13 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 5:15 PM MST	Blowing Dust Advisory	PSR		105 min
Jun 29, 6:52 PM MST	Special Weather Statement	PSR	Maricopa	68 min
Jun 29, 7:11 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	49 min
Jun 29, 7:32 PM MST	Special Weather Statement	PSR	Maricopa	58 min
Jun 29, 7:48 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jun 29, 7:58 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	32 min
Jun 29, 8:23 PM MST	Flash Flood Warning	PSR	Maricopa	112 min
Jun 29, 9:15 PM MST	Special Weather Statement	PSR		45 min
Jun 29, 9:43 PM MST	Severe Thunderstorm Warning	PSR	La Paz	32 min
Jun 29, 9:53 PM MST	Special Weather Statement	PSR		22 min
Jun 29, 10:07 PM MST	Special Weather Statement	PSR		38 min
Jun 29, 10:49 PM MST	Special Weather Statement	PSR	Maricopa	41 min
Jun 30, 10:56 AM MST	Special Weather Statement	PSR		64 min
Jun 30, 12:01 PM MST	Special Weather Statement	PSR	Imperial	44 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2015 Every severe thunderstorm warning in 2015

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.