Alert archive / Arizona / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 91, NWS Phoenix, AZ

October 25, 1998Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Oct 25, 1998, 7:32 AM MST for Maricopa County, Arizona. It was in force for 38 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
Oct 25, 1998, 7:32 AM MST (14:32 UTC)
Expired
Oct 25, 1998, 8:10 AM MST
In force
38 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Maricopa County, AZ

What was reported inside it

TimeReportWhereRemark
Oct 25, 7:50 AM MSTHail 0.75Fountain Hills, AZChurch services interrupted by hail and very heavy rain.

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 nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 2.5 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 1998-10-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 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 12:00Z on 1998-10-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 square meters per square second.19395878Sfc1 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
27 J/kg
Mixed-layer CIN
-100 J/kg
Mixed-layer LCL
1768 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPHX 251432
SVRPHX
AZC013-251510-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
732 AM MST SUN OCT 25 1998

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN MARICOPA COUNTY IN CENTRAL ARIZONA

* UNTIL 810 AM MST

* AT 730 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES SOUTHWEST OF FOUNTAIN HILLS... MOVING
  NORTHEAST 30.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FOUNTAIN HILLS
  FORT MCDOWELL INDIAN RESERVATION
  STATE ROUTE 87 SOUTH OF SUNFLOWER

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS!
l

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 25, 10:21 AM MSTSevere Thunderstorm WarningPSRGila, Maricopa39 min
Oct 25, 1:44 PM MSTSevere Thunderstorm WarningPSRMaricopa31 min
Oct 25, 3:07 PM MSTSevere Thunderstorm WarningPSRMaricopa33 min
Oct 25, 3:42 PM MSTSevere Thunderstorm WarningPSRMaricopa28 min
Oct 25, 4:12 PM MSTSevere Thunderstorm WarningPSRGila18 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.