Alert archive / Arizona / Flash Flood Warnings in 1998

Flash Flood Warning 4, NWS Tucson, AZ

February 24, 1998Pinal County, Arizona

NWS Tucson, AZ issued this flash flood warning at Feb 24, 1998, 5:20 PM MST for Pinal County, Arizona. It was in force for 90 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, 5:20 PM MST (00:20 UTC)
Expired
Feb 24, 1998, 6:50 PM MST
In force
90 min
Issued by
NWS Tucson, AZ
Area
Whole counties

County Pinal County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 0.3 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 1998-02-25Temperature 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 KTUS 250021
FFWTUS
AZC021-250150-

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


THE NATIONAL WEATHER SERVICE IN TUCSON AZ HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 650 PM MST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTH CENTRAL ARIZONA

   ...SOUTHEASTERN PINAL COUNTY


AT 510 PM MST A SPOTTER NEAR WINKELMAN REPORTED EXTENSIVE
STREET FLOODING WITH HEAVY RAIN IN PROGRESS. THE BAND OF RAIN
REPORTED BY THIS SPOTTER HAS MOVED INTO SOUTHWEST GRAHAM COUNTY
...BUT TUCSON DOPPLER RADAR SHOWED ANOTHER AREA OF HEAVY SHOWERS AND
ISOLATED THUNDERSTORMS FROM MAMMOUTH TO ORACLE JUNCTION. THIS AREA
OF MOVING TO THE NORTHEAST AT 30 MLPH.

FLASH FLOODING WILL REMAIN POSSIBLE IN SOUTHEAST PINAL COUNTY
THROUGH 650 PM MST.

OKULSKI

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.

NWS Tucson, AZ wrote its last area forecast discussion before this flash flood warning went out at Feb 24, 2:30 PM MST, 2 hours 50 minutes earlier.

Area forecast discussion, Feb 24, 2:30 PM MST, 2 hours 50 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
230 PM MST TUE FEB 24 1998

SYNOPSIS...WINTER STORM MOVING ACROSS AREA. FRONT MOVING INTO
EASTERN AREAS AND WILL PUSH INTO NEW MXICO AROUND 500 PM. HIGH WINDS
ARE OCCURING AHEAD OF THE FRONT...SHOWERS AND THUNDERSTORMS ALONG
AND BEHIND THE FRONT. BROADER AREA OF RAIN EXPECTED TO DEVELOP LATER
THIS EVENING.

DISCUSSION...WILL ALLOW WIND ADVSY TO END AT 5PM...MOST OF WNDS
SHOULD BE DOWN AS FRONTAL BAND OF PRECIP MOVES THRU. MAY NEED HIGH
WND WARNING STILL FOR FAR SE AZ BUT WILL HOLD OFF ON THIS FOR NOW
BUT MAY NEED TO ADD THIS IF FRONT DOES NOT GET THRU. NOT MUCH PRECIP
WITH FRONT BUT EXPECTING MORE TO DEVELOP AS COLD AIR MOVES IN THE
TONIGHT. THIS IS KIND OF AN IFFY SCENARIO BUT MM5 SHOWS UPSLOPE
STARTING THIS EVENING AND FEEL COMFORTABLE IT WILL HAPPEN. QUESTION
IS HOW MUCH RAIN...MODELS INDIACTE UP TO AN INCH ON MTNS AND THIS
MAY CAUSE SOME FLOODING PROBLEMS. THICKNESS COOLING ENDS LATE
TONIGHT AND PRECIP SHOULD END SHORTLY THEREAFTER. LUKS LIKE A
CLIPPER WILL PASS BY FOR SOME LIGHT PRECIP THU NIGHT/FRI.
TUS +94. HOLBROOK

TUS...WINTER STORM WARNING ABOVE 5000 FEET TONIGHT ALL OF SOUTHEAST
ARIZONA EXCEPT FAR WESTERN PIMA COUNTY.

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.