Alert archive / Arizona / Flash Flood Warnings in 1998

Flash Flood Warning 2, NWS Phoenix, AZ

February 24, 1998Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Feb 24, 1998, 7:56 PM MST for Maricopa County, Arizona. It was in force for 94 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, 7:56 PM MST (02:56 UTC)
Expired
Feb 24, 1998, 9:30 PM MST
In force
94 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Maricopa County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 2.9 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 1998-02-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 42 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 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 1998-02-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.1939587897117136Sfc1 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
42 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1555 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
10 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.

000 
TTAA00 KPHX 250257
FFWPHX
AZC013-250430-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
756 PM MST TUE FEB 24 1998

*  FLASH FLOOD WARNING FOR
   NORTH CENTRAL MARICOPA COUNTY IN CENTRAL ARIZONA

*  UNTIL 930 PM MST

*  SOME LOCATIONS AFFECTED
   DESERT HILLS
   CAVE CREEK
 
*  FLASH FLOODING CONTINUED IN THE DESERT HILLS AND CAVE CREEK AREAS.
   AT 750 PM MST DOPPLER RADAR SHOWED MODERATE TO LOCALLY HEAVY RAIN
   MOVING INTO THE AREA FROM THE WEST AND SOUTHWEST. THUS THE WARNING
   HAS BEEN EXTENDED UNTIL 930 PM.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLASH FLOODING.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 24, 6:54 PM MSTFlash Flood WarningPSRMaricopa61 min

Nearby

Flash Flood Warnings in Arizona, 1998Every flash flood 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.