Alert archive / Arizona / Flash Flood Warnings in 1991
Flash Flood Warning 2, NWS Tucson, AZ
NWS Tucson, AZ issued this flash flood warning at Sep 1, 1991, 4:40 PM MST for Pima County, Santa Cruz County, Arizona. It was in force for 2 hr.
The area
The counties it named.
The facts
- Issued
- Sep 1, 1991, 4:40 PM MST (23:40 UTC)
- Expired
- Sep 1, 1991, 6:45 PM MST
- In force
- 2 hr
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties
Counties Pima County, AZ, Santa Cruz County, AZ
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 11.7 hours before the alert went out and 56 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.
- Mixed-layer CAPE
- 128 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 2199 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- -28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KTUS 012340
FFWTUS
AZC019-023-020145-
BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
440 PM MST SUN SEP 1 1991
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 645 PM MST FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN THE SOUTHEAST PART OF ARIZONA
CENTRAL PIMA...WESTERN SANTA CRUZ
AT 420 PM MST TUCSON RADAR INDICATED PERSISTENT STRONG
THUNDERSTORMS ACROSS CENTRAL PIMA AND WESTERN SANTA CRUZ COUNTIES.
THESE STORMS APPEAR TO BE AFFECTING THE COMMUNITIES OF SELLS...
TOPAWA...SAN MIGUEL...SASABE...ARIVACA AND NOGALES. THOUGH THESE
STORMS MAY NOT DIRECTLY BE OVER THE COMMUNITIES MENTIONED RUNOFF
FROM SURROUNDING MOUNTAINS COULD CAUSE FLOODING IN AREAS NOT
RECEIVING RAIN DIRECTLY.
STAY OUT OF WASHES AND LOW LYING AREAS. FLASH FLOODS CAN OCCUR
WITH LITTLE OR NO ADVANCE WARNING.
IF YOU ARE IN THE WARNED COUNTY IN AN AREA SUBJECT TO FL1OODING
MOVE TO HIGHER GROUND.
DO NOT ATTEMPT TO DRIVE OVER ROADS COVERED BY FLOOD WATERS OR
ACROSS FLOODED HIGHWAY DIPS.
NORDQUISTWhat 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, Sep 1, 12:18 PM MST, 4 hours 22 minutes before
AZZ007-012300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 1217 PM MST SUN SEP 01 1991 ...THUNDERSTORMS DEVELOPING IN SOUTHCENTRAL ARIZONA... AT 1210 PM MST TUCSON WEATHER RADAR AND BUREAU OF LAND MANAGEMENT LIGHTNING DETECTION EQUIPMENT INDICATED THUNDERSTORMS DEVELOPING IN SOUTHCENTRAL ARIZONA. AT THIS TIME THE STRONGEST STORMS ARE LOCATED IN CENTRAL PIMA COUNTY ALONG STATE ROUTE 86 BETWEEN TUCSON AND AJO AND JUST SOUTH OF INTERSTATE 8 BETWEEN CASA GRANDE AND GILA BEND. SOME OF THESE STORMS ARE MOVING SLOWLY TO THE NORTH WHILE OTHERS ARE NEARLY STATIONARY. SINCE THESE STORMS SHOW LITTLE MOVEMENT. LOCALIZED AREAS OF HEAVY RAINFALL MAY OCCUR...POSSIBLY LEADING TO FLOODING OF NORMALLY DRY WASHES AND ROADWAY DIPS. STRONG GUSTY WINDS ACCOMPANIED BY AREAS OF DENSE BLOWING DUST...AND NUMEROUS DEADLY CLOUD TO GROUND LIGHTNING STRIKES ARE ALSO POSSIBLE. THOSE TRAVELLING SHOULD BE AWARE OF RAPIDLY CHANGING CONDITIONS... AND USE EXTRA CAUTION WHILE IN THE AFFECTED AREAS THE REMAINDER OF THIS AFTERNOON AND EVENING. GANSHEIMER/NWS TUS
Nearby
Flash Flood Warnings in Arizona, 1991Every flash flood warning in 1991
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.