Alert archive / Arizona / Flash Flood Warnings in 1990

Flash Flood Warning 43, NWS Phoenix, AZ

August 12, 1990Mohave County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 12, 1990, 6:22 PM MST for Mohave County, Arizona. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 12, 1990, 6:22 PM MST (01:22 UTC)
Expired
Aug 12, 1990, 9:30 PM MST
In force
3 hr
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Mohave 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

Mercury/Desert R, NV (KDRA), launched 00:00Z, 1.4 hours before the alert went out and 226 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, Mercury/Desert R, NV at 00:00Z on 1990-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 64 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Mercury/Desert R, NV at 00:00Z on 1990-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 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
64 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
3346 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
19 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 130123
FFWPHX
AZC015-130430-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX ARIZONA
622 PM MST SUN AUG 12 1990
 
THE NATIONAL WEATHER SERVICE IN PHOENIX ARIZONA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 930 PM MST
FOR THE FOLLOWING LOCATIONS......
 
IN NORTHWEST ARIZONA
 
   ...MOHAVE COUNTY
 
THUNDERSTORMS WITH HEAVY RAIN HAVE DEVELOPED OVER MOHAVE COUNTY THE
PAST COUPLE OF HOURS...AND AT 615 PM WERE CONTINUING TO DEVELOP. A
RAIN GAUGE IN KINGMAN HAS REPORTED 1.92 INCHES OF RAIN SINCE 430 PM.
 
FLASH FLOODING IS ALREADY HAPPENING OR ABOUT TO HAPPEN. MOVE AWAY
FROM STREAMS OR WASHES. HEAD FOR HIGHER GROUND. ON THE HIGHWAY...SLOW
DOWN AND KEEP A SHARP LOOKOUT AHEAD FOR FLOODING.

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 12, 4:17 PM MST, 2 hours 5 minutes before
AZZALL-130100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX ARIZONA
415 PM MST SUN AUG 12 1990

THUNDERSTORM ACTIVITY AT 4 PM WAS NOT AS EXTENSIVE AS AT THE SAME TIME
YESTERDAY...WITH MOST OF TODAY/S ACTION MOVING SOUTHWEST OFF THE CENTRAL
MOUNTAINS AT THIS TIME.

THE STRONGEST THUNDERSTORMS SHOWN BY RADAR WERE LOCATED IN A LINE
EXTENDING FROM NORTHWEST OF PAYSON TO ABOUT 20 MILES SOUTH OF THE
TOWN.

THERE WAS ALSO A STRONG THUNDERSTORM CELL LOCATED OVER THE SALT RIVER
CANYON. MOTORISTS IN THIS AREA WILL NEED TO USE EXTREME CAUTION FOR THE
NEXT HOUR...ESPECIALLY WATCHING FOR FALLING ROCKS AND/OR ROCK SLIDES.

MOVEMENT OF THE THUNDERSTORMS WAS TOWARD THE SOUTHWEST ABOUT 20 M9ILES
AN HOUR.
>
JP 122315Z
Special weather statement, Aug 12, 5:36 PM MST, 46 minutes before
AZZALL-130200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX ARIZONA
535 PM MST SUN AUG 12 1990

AT 530 PM WEATHER RADAR SHOWED AN AREA OF LOCALLY HEAVY THUNDERSTORMS
MOVING SOUTHWEST THROUGH GILA COUNTY. WITHIN THE NEXT HOUR THESE
STORMS COULD BE IN THE GLOBE AREA...AND OVER ROOSEVELT LAKE.

MOTORISTS IN THESE AREAS...AND BOATERS ON THE LAKE...WILL NEED TO
WATCH WEATHER CONDITIONS CAREFULLY THE NEXT HOUR OR SO. IN ADDITION
TO HEAVY \RAIN AND STRONG GUSTY WINDS LIGHTNING DETECTION EQUIPMENT
SHOWED INTENSE LIGHTNING WITH THESE THUNDERSTORMS.

JP 130035Z

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.