Alert archive / Arizona / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 13, NWS Phoenix, AZ

July 11, 2002Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 11, 2002, 3:50 PM MST for Maricopa County, Arizona. It was in force for 40 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 11, 2002, 3:50 PM MST (22:50 UTC)
Expired
Jul 11, 2002, 4:30 PM MST
In force
40 min
Issued by
NWS Phoenix, AZ
Area
Counties, with a storm outline in the text

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 46 km from the middle of the area, began a volume at 22:51 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 12:00Z, 10.8 hours before the alert went out and 56 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, Phoenix, AZ at 12:00Z on 2002-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 173 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phoenix, AZ at 12:00Z on 2002-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 square meters per square second.1939Sfc1 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
173 J/kg
Mixed-layer CIN
-385 J/kg
Mixed-layer LCL
2589 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
4 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.

966 
WUUS55 KPSR 112250
SVRPSR
AZC013-112330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
347 PM MST THU JUL 11 2002

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA...INCLUDING 
THE FOLLOWING LOCATIONS...THE SALT RIVER RECREATIONAL 
LAKES...TORTILLA FLAT...AND THE FORT MCDOWELL INDIAN COMMUNITY...

* UNTIL 430 PM MST.

* AT 345 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER EXTREME EAST CENTRAL MARICOPA COUNTY...OR
  ABOUT 14 MILES WEST OF ROOSEVELT...MOVING SOUTHWEST AT 15 MPH.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER. 
REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS...DEADLY 
LIGHTNING...AND VERY HEAVY RAIN. STAY AWAY FROM WASHES...CREEK BEDS 
AND OTHER FLOOD-PRONE AREAS. BOATERS ARE URGED TO SEEK SAFE HARBOR. 

INTENSE LIGHTNING IS OCCURRING WITH THIS STORM...MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS. IF
TELEPHONE USE IS REQUIRED...USE A CELL PHONE. UNPLUG ANY UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE STORM ARRIVES. IF OUTDOORS...AVOID
ISOLATED TALL OBJECTS SUCH AS TREES.


LAT...LON 3381 11151 3360 11155 3348 11147 3348 11133
          3361 11123 3378 11143

AJ

Nearby

Severe Thunderstorm Warnings in Arizona, 2002Every severe thunderstorm warning in 2002

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.