Alert archive / Arizona / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 9, NWS Phoenix, AZ

July 7, 1998Maricopa County, Pinal County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 7, 1998, 5:27 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 53 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 7, 1998, 5:27 PM MST (00:27 UTC)
Expired
Jul 7, 1998, 6:20 PM MST
In force
53 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

Counties Maricopa County, AZ, Pinal County, AZ

What was reported inside it

TimeReportWhereRemark
Jul 7, 5:57 PM MSTThunderstorm Wind 50Phoenix, AZPower poles down on 19th Ave between Bell and Union Hills.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 7, 3:15 PM MSTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 0.5 hours before the alert went out and 143 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, Tuscon, AZ at 00:00Z on 1998-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 672 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, Tuscon, AZ at 00:00Z on 1998-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
672 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
1802 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
47 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.

599 
WUUS1 KPHX 080030 RRA
SVRPHX
AZC013-021-080110-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
527 PM MST TUE JUL 7 1998


THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

*  SEVERE THUNDERSTORM WARNING FOR
   EAST CENTRAL MARICOPA COUNTY IN CENTRAL ARIZONA
   NORTHWESTERN PINAL COUNTY IN CENTRAL ARIZONA

*  UNTIL 620 PM MST

*  AT 525 PM MST DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS
   OVER INTERSTATE 10 SOUTH OF CHANDLER BOULEVARD AND NEAR OCOTILLO.
   STORMS WERE MOVING VERY SLOWLY.


*  SOME LOCATIONS AFFECTED INCLUDE
   CHANDLER
   SUN LAKES
   OCOTILLO

DAMAGING WINDS IN EXCESS OF 60 MPH AND LOCALLY HEAVY RAINFALL
ARE LIKELY WITH THESE STORMS.


AJ

Nearby

Severe Thunderstorm Warnings in Arizona, 1998Every severe thunderstorm warning in 1998

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.