Alert archive / Arizona / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 21, NWS Phoenix, AZ

July 17, 1998Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 17, 1998, 11:23 PM MST for Maricopa County, Arizona. It was in force for 52 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
Jul 17, 1998, 11:23 PM MST (06:23 UTC)
Expired
Jul 18, 1998, 12:15 AM MST
In force
52 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Maricopa County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 6.4 hours before the alert went out and 198 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 1998-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 979 joules per kilogram.LCLEL10008507005003002001001 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 1998-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
979 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
3214 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

581 
WUUS1 KPHX 180626 RRA
SVRPHX
AZC013-180715-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
1123 PM MST FRI JUL 17 1998


THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

*  SEVERE THUNDERSTORM WARNING FOR
   SOUTHWESTERN MARICOPA COUNTY IN CENTRAL ARIZONA

*  UNTIL 1215 AM MST

*  AT 1125 PM MST DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS
   EAST OF GILA BEND.  MOVEMENT WAS TO THE SOUTHWEST AT 30 MPH.

*  SOME LOCATIONS AFFECTED INCLUDE
   INTERSTATE 8 EAST OF GILA BEND

STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 5:20 PM MSTSevere Thunderstorm WarningPSRMaricopa50 min
Jul 17, 6:01 PM MSTSevere Thunderstorm WarningPSRMaricopa69 min
Jul 17, 9:15 PM MSTSevere Thunderstorm WarningPSRGila, Maricopa80 min
Jul 17, 9:41 PM MSTSevere Thunderstorm WarningPSRYuma64 min
Jul 17, 9:53 PM MSTSevere Thunderstorm WarningPSRMaricopa, Pinal52 min
Jul 17, 10:41 PM MSTSevere Thunderstorm WarningPSRMaricopa, Pinal64 min

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; the sounding from the Mesonet's radiosonde archive.