Alert archive / Arizona / Flash Flood Warnings in 1998

Flash Flood Warning 14, NWS Phoenix, AZ

August 1, 1998Pinal County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 1, 1998, 6:45 PM MST for Pinal County, Arizona. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 1, 1998, 6:45 PM MST (01:45 UTC)
Expired
Aug 1, 1998, 8:45 PM MST
In force
2 hr
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Pinal County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 1.8 hours before the alert went out and 92 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 1998-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 439 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 1998-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 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
439 J/kg
Mixed-layer CIN
-129 J/kg
Mixed-layer LCL
1321 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
239 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPHX 020145
FFWPHX
AZC021-020345-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
645 PM MST SAT AUG 1 1998

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

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

*  UNTIL 845 PM MST

*  AT 645 PM MST DOPPLER RADAR ESTIMATED RAINFALL RATES IN EXCESS OF
   2 INCHES DURING THE PAST HOUR BETWEEN QUEEN VALLEY AND SUPERIOR.
   AS A RESULT...FLASH FLOODING IS OCCURRING OR IMMINENT IN THE
   WARNING LOCATIONS. ALTHOUGH THE THUNDERSTORMS WERE EAST OF QUEEN
   VALLEY...QUEEN CREEK WILL CARRY RUN-OFF INTO QUEEN VALLEY FROM
   THE AREA OF HEAVY RAINFALL.

*  SOME LOCATIONS AFFECTED INCLUDE
   S
UPERIOR
   QUEEN VALLEY
   US HIGHWAY 60 BETWEEN FLORENCE JUNCTION AND GILA/PINAL COUNTY LINE

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 1, 1:15 PM MST, 5 hours 30 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
115 PM MST SAT AUG 1 1998

AZZ020>028-CAZ030>033-021200-
MARICOPA-SOUTHERN GILA-NORTHWEST PINAL-YUMA-LA PAZ-IMPERIAL-
CENTRAL/EASTERN RIVERSIDE-JOSHUA TREE NATIONAL PARK-

...MODERATE RISK OF HAZARDOUS WEATHER IN SOUTHERN GILA...MARICOPA
...AND NORTHERN PINAL COUNTIES THIS AFTERNOON AND TONIGHT...

HEAVY RAINFALL...WHICH COULD RESULT IN LOCALIZED FLASH FLOODING OR
FLOODING...IS THE GREATEST HAZARD. RAINFALLS IN EXCESS OF 2 INCHES
PER HOUR ARE POSSIBLE. STRONG GUSTY WINDS...HAIL...AND INTENSE CLOUD-
TO-GROUND LIGHTNING CAN ALSO BE EXPECTED WITH THE MOST INTENSE
STORMS. INDIVIDUAL STORMS WILL MOVE SLOWLY TOWARD THE NORTHEAST.

STORMS ARE MOST LIKELY TO AFFECT THE GREATER PHOENIX METROPOLITAN
AREA TONIGHT...BUT MAY AFFECT LOCATIONS SUCH AS GILA BEND...CASA
GRANDE...AND GLOBE-MIAMI BY MID-AFTERNOON.
*********************************************************************

HAZARDOUS WEATHER REFERS TO ANY OF THE FOLLOWING...

1)   LOCALLY HEAVY RAINFALL RESULTING IN FLASH FLOODING OR FLOODING
2)   SAND OR DUST STORM REDUCING VISIBILITY TO 1/4 MILE OR LESS
3)   DAMAGINGF WINDS IN EXCESS OF 57 MPH
4)   HAIL 3/4 INCH OR LARGER IN DIAMETER

CHECK THE PHOENIX STATE FORECAST DISCUSSION FOR MORE INFORMATION.

DG

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.