Alert archive / Arizona / Flash Flood Warnings in 1987

Flash Flood Warning 7, NWS Phoenix, AZ

October 24, 1987Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Oct 24, 1987, 5:18 PM MST for Maricopa County, Arizona. It was in force for 117 min.

The area

The counties it named.

The facts

Issued
Oct 24, 1987, 5:18 PM MST (00:18 UTC)
Expired
Oct 24, 1987, 7:15 PM MST
In force
117 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Maricopa 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 00:00Z, 0.3 hours before the alert went out and 198 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 1987-10-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 46 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, Tuscon, AZ at 00:00Z on 1987-10-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
46 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
2243 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 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 250018
FFWPHX
AZC013-250215-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX ARIZONA
518 PM MST SAT OCT 24 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL  715 PM MST FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH CENTRAL ARIZONA
          ...NORTHWESTERN MARICOPA...IN AND AROUND THE CITY OF
WICKENBURG.
 
 
PHOENIX WEATHER RADAR DETECTED A BAND OF VERY HEAVY RAIN MOVING
TOWARDS THE CITY OF WICKENBURG.  LAST NIGHT ONE HALF INCH OF RAIN
FELL CAUSING MANY WASHES IN THE WICKENBURG AREA TO RUN...INCLUDING
THE MOHAVE...RINCON...SOLS AND HASSAYAMPA WASHES.  THIS RESULTED IN
ROADS TO HOMES BEING CUT OFF AND A FEW VEHICLES GETTING STUCK IN MUD.
 
AT 515 HEAVY HEAVY RAIN WAS STARTING TO FALL IN WICKENBURG AND THE
WEATHER SERVICE EXPECTS ACCUMULATIONS COULD BE AN INCH OR MORE.
IN ADDITION HAIL AND VERY STRONG WINDS COULD ALSO DEVELOP.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS FLOODED WASHES...DIPS...OR LOW SPOTS.  NEVER TRY
TO CROSS A RUNNING WASH OR A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

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, Oct 24, 2:46 PM MST, 2 hours 32 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE YUMA, AZ
245 PM MST SAT OCT 24 1987

           ...HEAVY SHOWERS IN THE QUARTZSITE AREA...

AT 230 THIS AFTERNOON STORM SPOTTERS IN QUARTZSITE REPORTED A HEAVY
RAINSHOWER THAT HAD BEEN FALLING FOR THE LAST HALF HOUR...ACCUMULATING
ABOUT A HALF INCH OF RAIN. THE SHOWER IS ONE OF A FEW THAT ARE ON RADAR
IN NORTHERN YUMA COUNTY AND LAPAZ COUNTIES...MOVING NORTHEAST AT 10 MPH.

THE QUARTZSITE AREA IS PRIME FLASH FLOOD COUNTRY. MOTORISTS ARE URGED
TO BE WATCHFUL FOR RUNNING WATER OVER ROADWAYS...ESPECIALLY IN DIPS ON
HIGHWAY 95 IN NORTHERN YUMA COUNTY...AND HIGHWAYS 95...72 AND 60 IN
LAPAZ COUNTY.

THE SHOWERS WILL SLOWLY WEAKEN WEAKEN LATER THI*S AFTERNOON AND EVENING.

MATHESON
Special weather statement, Oct 24, 4:10 PM MST, 1 hour 8 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE YUMA, AZ
409 PM MST SAT OCT 24 1987

 ...HEAVY SHOWERS IN LAPAZ COUNTY...EASTERN SAN BERNADINO COUNTY...

STORM SPOTTERS ALONG THE COLORADO RIVER IN NORTHERN LAPAZ COUNTY AND
SAN BERNADINO COUNTY IN CALIFORNIA REPORT LARGE SHOWER CELLS MOVING
TO THE NORTHEAST TOWARD LAKE HAVASU CITY AT 4 PM.

SLOW MOVING HEAVY SHOWERS ARE ALSO MOVING ACROSS NORTHERN YUMA COUNTY AND
LAPAZ COUNTIES THIS AFTERNOON. ACCUMULATIONS FROM A HALF INCH TO AN INCH
HAVE BEEN WIDESPREAD...WITH REPORTS OF RUNNING WATER IN WASHES.

THIS IS PRIME FLASH FLOOD COUNTRY. MOTORISTS ARE URGED TO DRIVE WITH
CAUTION AND BE ON THE LOOKOUT FOR RUNNING WATER ON THE ROADS AND
REMEMBERc THAT FLASH FLOODING IS POSSIBLE. SHOWERS OVER NEARBY MOUNTAINS
WILL CAUSE SUDDEN FLASH FLOODS IN SEEMINGLY SAFE AREAS WHERE THERE ARE
DIPS IN THE ROADWAYS.

THE SHOWER ACTIVITY WILL GRADUALLY DIMINISH THIS EVENING.
<

MATHESON
Special weather statement, Oct 24, 4:50 PM MST, 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
445 PM MST FRI OCT 23 1987

    ...VERY HEAVY RAIN DEVELOPING OVER NORTHWEST MARICOPA AND
                SOUTHWEST YAVAPAI COUNTIES...

AT 430 PM WEATHER RADAR WAS DETECTING VERY HEAVY RAINFALL OVER
NORTHWEST MARICOPA AND SOUTHWEST YAVAPAI COUNTIES.  A LINE OF
VERY HEAVY RAIN EXTENDED FROM JUST SOUTHWEST OF PRESCOTT TO
INTERSTATE 10 ABOUT 25 MILES WEST OF TONOPAH.

RAINFALL AMOUNTS OF NEARLY AN INCH CAN BE EXPECTED FROM THIS RAIN
BAND CAUSING FLOODING OF WASHES...ROADWAY DIPS AND REDUCING
VISIBILITIES FOR THOSE MOTORIST ALONG HIGHWAY 60 FROM AGUILA
TO WICKENBURG.

THIS HEAVY RAINBAND WILL BE MOVING INTO THE WICKENBURG AREA }WITHIN
THE HOUR CAUSING THE NEARBY HASSAYAMPA AND SOLS WASH TO RUN.

SOME LOCALY HEAVY RAIN MAY ALSO OCCUR IN THE PRESCOTT AREA IN THE
NEXT HOUR OR SO.

VASQUEZ
Special weather statement, Oct 24, 4:52 PM MST, 26 minutes before
SPECIAL WEATHER STATEMENT.............CORRECTION FOR DATE AND TIME
NATIONAL WEATHER SERVICE PHOENIX AZ
445 PM MST SAT OCT 24 1987

    ...VERY HEAVY RAIN DEVELOPING OVER NORTHWEST MARICOPA AND
                SOUTHWEST YAVAPAI COUNTIES...

AT 430 PM WEATHER RADAR WAS DETECTING VERY HEAVY RAINFALL OVER
NORTHWEST MARICOPA AND SOUTHWEST YAVAPAI COUNTIES.  A LINE OF
VERY HEAVY RAIN EXTENDED FROM JUST SOUTHWEST OF PRESCOTT TO
INTERSTATE 10 ABOUT 25 MILES WEST OF TONOPAH.

RAINFALL AMOUNTS OF NEARLY AN INCH CAN BE EXPECTED FROM THIS RAIN
BAND CAUSING FLOODING OF WASHES...ROADWAY DIPS AND REDUCING
VISIBILITIES FOR THOSE MOTORIST ALONG HIGHWAY 60 FROM AGUILA
TO WICKENBURG.

THIS HEAVY RAINBAND WILL BE MOVING INTO THE WICKENBURG AREA WITHIN

SOME LOCALY HEAVY RAIN MAY ALSO OCCUR IN THE PRESCOTT AREA IN THE
NEXT HOUR OR SO.

VASQUEZ

Nearby

Flash Flood Warnings in Arizona, 1987Every flash flood warning in 1987

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.