Alert archive / Michigan / Flash Flood Warnings in 1986

Flash Flood Warning 9, NWS Gaylord, MI

September 11, 1986Oceana County, Michigan

NWS Gaylord, MI issued this flash flood warning at Sep 11, 1986, 11:40 AM EDT for Oceana County, Michigan. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Sep 11, 1986, 11:40 AM EDT (15:40 UTC)
Expired
Sep 11, 1986, 3:00 PM EDT
In force
3 hr
Issued by
NWS Gaylord, MI
Area
Whole counties

County Oceana 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 3.7 hours before the alert went out and 168 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, Green Bay/Straub, WI at 12:00Z on 1986-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Green Bay/Straub, WI at 12:00Z on 1986-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 235 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
549 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
235 m²/s²
0-3 km storm-relative helicity
251 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 KARB 111551
FFWMKG
MIC127-111900-

BULLETIN...IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ANN ARBOR MI
ISSUED BY ANN ARBOR MI
1140 AM EDT THU SEP 11 1986

             ..........DAM FAILURE..........

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 3 PM EDT FOR PEOPLE IN THE WEST CENTRAL MICHIGAN
COUNTY OF OCEANA.

IT HAS BEEN REPORTED BY THE  SHERIFF OF OCEANA COUNTY THAT THE HART
DAM IN OCEANA COUNTY HAS BEEN BREACHED  ON THE SOUTH BRANCH OF THE
PENTWATER RIVER.

THE NEAREST DOWNSTREAM TOWN IS PENTWATER LOCATED 10 MILES
FROM THE FAILED DAM. THE TRAVEL TIME OF THE CREST IS 2 HOURS FROM THE
TIME OF DAM FAILURE.

THESE FLOOD WATERS ARE MOVING DOWN THE SOUTH BRANCH OF THE PENTWATER
RIVER TOWARDS THE TOWN OF PENTWATER AND ARE EXPECTED TO REACH
PENTWATER BETWEEN 1 AND 2 PM WITH A MAXIMUM CREST OF 8 FEET ABOVE THE
LEVEL OF LAKE PENTWATER.

PEOPLE LIVING IN THE FLOOD PRONE AREA SHOULD MOVE TO HIGHER GROUND
IMMEDIATELY.

FURTHER STATEMENTS WILL BE ISSUED AS MORE INFORMATION BECOMES AVAILABLE

.....CHARSON...SERVICE HYDROLOGIST...

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 10, 8:16 PM EDTSevere Thunderstorm WarningAPXMuskegon, Newaygo59 min
Sep 10, 9:10 PM EDTFlash Flood WarningAPXMuskegon, Newaygo110 min
Sep 10, 11:02 PM EDTFlash Flood WarningAPXMuskegon, Newaygo, Oceana118 min
Sep 11, 3:35 AM EDTFlash Flood WarningAPXLake, Mecosta, Osceola4 hr
Sep 11, 3:35 AM EDTFlash Flood WarningAPXMason4 hr
Sep 11, 6:15 AM EDTFlash Flood WarningAPXMuskegon105 min
Sep 11, 7:37 AM EDTFlash Flood WarningAPXMuskegon, Newaygo, Oceana4 hr
Sep 11, 7:37 AM EDTFlash Flood WarningAPXLake, Mecosta, Osceola4 hr
Sep 11, 7:37 AM EDTFlash Flood WarningAPXMason4 hr
Sep 11, 7:49 PM EDTFlash Flood WarningAPXOceana2 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.