Alert archive / Arizona / Flash Flood Warnings in 1990

Flash Flood Warning 7, NWS Tucson, AZ

July 24, 1990Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 24, 1990, 7:11 AM MST for Pima County, Arizona. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Jul 24, 1990, 7:11 AM MST (14:11 UTC)
Expired
Jul 24, 1990, 9:15 AM MST
In force
2 hr
Issued by
NWS Tucson, AZ
Area
Whole counties

County Pima County, AZ

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 2.2 hours before the alert went out and 84 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 1990-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 788 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 1990-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
788 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
1420 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
83 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 241433 COR
FFWTUS
AZC019-241615-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
711 AM MST TUE JUL 24 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 915 AM MST FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE SOUTH CENTRAL PART OF ARIZONA
      EASTERN PIMA

AT 710 AM RADAR AND VISUAL REPORTS AS WELL AS REPORTS FROM
PIMA COUNTY FLOOD CONTROL GAUGES INDICATE HEAVY RAINS ARE MOVING
INTO THE TUCSON AREA...FLOODING IS OCCURRING.

STAY OUT OF WASHES AND LOW LYING AREAS.  FLASH FLOODS CAN OCCUR
WITH LITTLE OR NO ADVANCE WARNING.

DO NOT ATTEMPT TO DRIVE OVER ROADS COVERED BY FLOOD WATERS OR

ACROSS FLOODED HIGHWAY DIPS.

 NORDQUIST

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 10:00 AM MSTFlash Flood WarningTWCPima2 hr

Nearby

Flash Flood Warnings in Arizona, 1990Every flash flood warning in 1990

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.