Alert archive / Michigan / Flash Flood Warnings in 1986

Flash Flood Warning 9, NWS Grand Rapids, MI

September 11, 1986Kent County, Montcalm County, Michigan

NWS Grand Rapids, MI issued this flash flood warning at Sep 11, 1986, 5:05 AM EDT for Kent County, Montcalm County, Michigan. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Sep 11, 1986, 5:05 AM EDT (09:05 UTC)
Expired
Sep 11, 1986, 9:00 AM EDT
In force
4 hr
Issued by
NWS Grand Rapids, MI
Area
Whole counties

Counties Kent County, MI, Montcalm County, MI

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

Detroit, MI (KFNT), launched 00:00Z, 9.1 hours before the alert went out and 164 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, Detroit, MI at 00:00Z on 1986-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 200 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, Detroit, MI at 00:00Z on 1986-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 247 square meters per square second.193958Sfc1 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
200 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
661 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
247 m²/s²
0-3 km storm-relative helicity
307 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KGRR 110905
FFWGRR
MIC081-117-111300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
505 AM EDT THU SEP 11 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 900 AM EDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

SOUTHWEST LOWER MICHIGAN...KENT AND MONTCALM

AT 455 AM EDT RADAR INDICATED AN AREA OF MODERATE TO HEAVY RAIN AND
THUNDERSTORMS OVER MUCH OF CENTRAL MICHIGAN..CENTRAL LAKE MICHIGAN
EXTENDING WEST THROUGH CENTRAL AND SOUTHERN WISCONSIN. THE AREA OF
SHOWERS AND THUNDERSTORMS WAS MOVING EAST TO NORTHEAST AT 35 MPH.
THE CONTINUING PRECIPITATION THIS MORNING..FALLING ON TOP OF THE
HEAVY AMOUNTS RECORDED IN THE LAST 24 HOURS..WILL ADD TO THE
FLOODING PROBLEMS ALREADY OCCURRING IN BOTH KENT AND MONTCALM
COUNTIES. REPORTS OF SIX TO TEN INCHES OF RAIN HAVE BEEN REPORTED
IN THESE COUNTIES SINCE IT BEGAN ON TUESDAY AFTERNOON.

A FLASH FLOOD WARNING MEANS FLOODING IS IMMINENT OR HAS BEEN
REPORTED. TAKE ACTION TO SAFEGUARD LIFE AND PROPERTY.

 OPTIONAL FREE FORMAT ACTION STATEMENT
 MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES. DO NOT ATTEMPT
  TO CROSS BRIDGES, DIPS, OR +LOW SPOTS IF WATER COVERS THE ROADWAY.
  NEVER TRY TO CROSS A FLOWING STREAM, EVEN A SMALL ONE, ON FOOT.

KERSEY

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

Local storm report, Sep 11, 12:40 AM EDT, 4 hours 25 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE MUSKEGON MI
12430 AM EDT THU SEP 11 1986

CENTRAL DISPATCH REPORTED NUMEROUS ROADS FLOODED IN THE WHITEHALL
AREA...ABOUT 15 MILES NORTH OF MUSKEGON.  SANDBAGGING WAS DONE AT
WHITEHALL MANOR..A NURSING HOME..WITH POSSIBLE EVACUATION CONSIDERED.
WHITEHALL POLICE ESTIMATED UP TO 5 INCHES OF RAIN HAD FALLEN DURING THE
STORMS TONIGHT..NOT COUNTING THE APPROXIMATE 4 INCHES THAT HAD FALLEN
EARLIER.

CENTRAL DISPATCH ALSO REPORTED LARGE TREES DOWN AT SEVERAL LOCATIONS
ON THE WEST SIDE OF MUSKEGON COUNTY.

MAPLE ISLAND ROAD HAS BEEN WASHED OUT BETWEEN RYERSON ROAD AND
MICHILINDA ROAD IN MUSKEGON COUNTY.

REPORTS OF WATER 7 INCHES DEEP ACROSS ROADS WAS ALSO REPORTED IN SOME
NORTH SECTIONS OF THE COUNTY.
OCEANA COUNTY SHERIFF REPORTED NUMEROUS ROADS WASHED OUT IN THE SOUTH
PART OF THE COUNTY.

DAMAGE REPORTS ARE SPOTTY..APPARENTLY DUE TO LINE DAMAGE AND THE FACT
THAT MOST POLICE AGENCIES ARE TOO BUSY` TO TALK.

ADDITIONAL STORM REPORTS WILL BE SENT AS SOON AS WE CAN GET FURTHER
RELIABLE DATA.

GALLOWAY

The office that day

Everything else NWS Grand Rapids, MI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 10, 9:34 PM EDTSevere Thunderstorm WarningGRRKent41 min
Sep 10, 10:26 PM EDTFlash Flood WarningGRRKent3 hr
Sep 10, 11:07 PM EDTFlash Flood WarningGRRGratiot3 hr
Sep 10, 11:47 PM EDTFlash Flood WarningGRRMontcalm4 hr
Sep 11, 1:11 AM EDTFlash Flood WarningGRRKent4 hr
Sep 11, 3:03 AM EDTFlash Flood WarningGRRMontcalm4 hr

Nearby

Flash Flood Warnings in Michigan, 1986Every flash flood warning in 1986

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.