Alert archive / Arizona / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 4, NWS Phoenix, AZ

February 24, 1998Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Feb 24, 1998, 2:59 PM MST for Maricopa County, Arizona. It was in force for 46 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
Feb 24, 1998, 2:59 PM MST (21:59 UTC)
Expired
Feb 24, 1998, 3:45 PM MST
In force
46 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 77 km from the middle of the area, began a volume at 22:02 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

Tuscon, AZ (KTUS), launched 12:00Z, 10.0 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 12:00Z on 1998-02-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 1998-02-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 370 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2979 m above ground
0-6 km bulk shear
104 kt
0-1 km storm-relative helicity
370 m²/s²
0-3 km storm-relative helicity
506 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.

990 
WUUS1 KPHX 242200 RRA
SVRPHX
AZC013-242245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
259 PM MST TUE FEB 24 1998

*  SEVERE THUNDERSTORM WARNING FOR
   CENTRAL MARICOPA COUNTY IN CENTRAL ARIZONA

*  UNTIL 345 PM MST

*  SOME LOCATIONS AFFECTED
   PHOENIX
   GLENDALE
   PEORIA
   SUN CITY
 
*  AT 300 PM MST RADAR INDICATED A SEVERE THUNDERSTORM
   IN THE WEST VALLEY OF METRO PHOENIX. MOVEMENT WAS TO
   THE EAST-NORTHEAST AT 25 TO 30 MPH.

HAIL OF THREE QUARTERS OF AN INCH IN DIAMETER OR LARGER IS 
LIKELY WITH THIS STORM...ALONG WITH VERY HEAVY RAINFALL. THIS
WARNING SUPERCEDES THE LAST SEVERE THUNDERSTORM WARNING THAT WAS
ISSUED FOR BUCKEYE.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 24, 12:22 PM MSTSevere Thunderstorm WarningPSRMaricopa33 min
Feb 24, 2:25 PM MSTSevere Thunderstorm WarningPSRMaricopa50 min
Feb 24, 2:25 PM MSTSevere Thunderstorm WarningPSRMaricopa35 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; radar from the NEXRAD Level II archive.