Alert archive / Michigan / Flash Flood Warnings in 1986

Flash Flood Warning 12, NWS Grand Rapids, MI

September 12, 1986Kent County, Michigan

NWS Grand Rapids, MI issued this flash flood warning at Sep 12, 1986, 2:54 AM EDT for Kent County, Michigan. It was in force for 66 min.

The area

The counties it named.

The facts

Issued
Sep 12, 1986, 2:54 AM EDT (06:54 UTC)
Expired
Sep 12, 1986, 4:00 AM EDT
In force
66 min
Issued by
NWS Grand Rapids, MI
Area
Whole counties

County Kent 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, 6.9 hours before the alert went out and 176 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 1986-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 1986-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 square meters per square second.1939587897Sfc1 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
1 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
900 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 12, 2:05 AM EDTFlash Flood WarningGRRIonia4 hr
Sep 12, 2:13 AM EDTFlash Flood WarningGRRClinton, Gratiot107 min
Sep 12, 4:18 AM EDTFlash Flood WarningGRRClinton, Gratiot2 hr
Sep 12, 7:00 AM EDTFlash Flood WarningGRRClinton, Gratiot2 hr
Sep 12, 7:29 PM EDTFlash Flood WarningGRRIonia, Kent4 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.