Alert archive / Michigan / Flash Flood Warnings in 1986
Flash Flood Warning 9, NWS Grand Rapids, MI
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 9:34 PM EDT | Severe Thunderstorm Warning | GRR | Kent | 41 min |
| Sep 10, 10:26 PM EDT | Flash Flood Warning | GRR | Kent | 3 hr |
| Sep 10, 11:07 PM EDT | Flash Flood Warning | GRR | Gratiot | 3 hr |
| Sep 10, 11:47 PM EDT | Flash Flood Warning | GRR | Montcalm | 4 hr |
| Sep 11, 1:11 AM EDT | Flash Flood Warning | GRR | Kent | 4 hr |
| Sep 11, 3:03 AM EDT | Flash Flood Warning | GRR | Montcalm | 4 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.