Alert archive / Iowa / Flash Flood Warnings in 1987

Flash Flood Warning 2, NWS Omaha, NE

May 26, 1987Mills County, Montgomery County, Iowa

NWS Omaha, NE issued this flash flood warning at May 26, 1987, 5:12 AM CDT for Mills County, Montgomery County, Iowa. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: May 26, 1987, 5:12 AM CDT (10:12 UTC)
Expired: May 26, 1987, 9:15 AM CDT
In force: 4 hr
Issued by: NWS Omaha, NE
Area: Whole counties

Counties Mills County, IA, Montgomery County, IA

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

Omaha, NE (KOAX), launched 00:00Z, 10.2 hours before the alert went out and 88 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3550 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 328 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 KOMA 261012
FFWOMA
IAC129-137-261415-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA NE
512 AM CDT TUE MAY 26 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 915 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

SOUTHWEST IOWA...MILLS AND MONTGOMERY

AT 5 AM HEAVY RAINS WERE FALLING IN MILLS AND MONTGOMERY COUNTIES
IN IOWA.  STEET AND BASEMENT FLOODING WAS REPORTED IN RED OAK
AT 445 AM BY THE LOCAL POLICE.  OVER 2 INCHES OF RAIN WAS REPORTED
BY THE GLENWOOD POLICE.  ADDITIONAL HEAVY RAINS TODAY WILL ONLY
AGGRAVATE THE CURRENT FLOODING PROBLEMS.

A FLASH FLOOD WARNING MEANS THAT FLASH FLOODING IS IMMINENT OR
HAS BEEN REPORTED.  RESIDENTS SHOULD TAKE IMMEDIATE PRECAUTIONS.
DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS BY FOOT OR BY AUTO.

DO NOT ATTEMPT TO DRIVE OVER A ROAD COVERED BY WATER.  THE ROAD
COULD BE WASHED OUT UNDER THE WArTER SURFACE.

CLARK

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, May 26, 5:00 AM CDT, 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA NE
450 AM CDT TUE MAY 26 1987

THUNDERSTORMS WERE RUMBLING OVER EASTERN NEBRASKA AND WESTERN IOWA
AT 430 AM WITH THE HEAVIEST ACTIVITY BETWEEN OMAHA AND COLUMBUS AND
TO ABOUT 40 MILES SOUTHEAST OF OMAHA.  THE THUNDERSTORMS SHOULD
CONTINUE FOR ANOTHER HOUR OR SO IN THESE AREAS.

MARBLE SIZE HAIL WAS REPORTED IN WEST OMAHA AND OVER 2 INCHES OF
RAIN FELL IN RED OAK IOWA ABOUT 40 MILES SOUTHEAST OF OMAHA AND
IN GLENWOOD IOWA ABOUT 30 MILES SOUTHEAST OF OMAHA.  STREET FLOODING
...WATER IN BASEMENTS AND OTHER WATER PROBLEMS WERE REPORTED BY THE
RED OAK POLICE AT 445 AM THIS MORNING.

THESE STORMS SHOULD LET UP BY AROUND 6 AM BUT A REPEAT PlERFORMANCE
MAY OCCUR LATER TODAY AND TONIGHT.

CLARK

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 8:42 AM CDT	Flash Flood Warning	OAX	Pottawattamie	4 hr

Nearby

Flash Flood Warnings in Iowa, 1987 Every 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.