Alert archive / Michigan / Flash Flood Warnings in 1997

Flash Flood Warning 2, NWS Grand Rapids, MI

February 21, 19974 counties in Michigan

NWS Grand Rapids, MI issued this flash flood warning at Feb 21, 1997, 8:25 AM EST for 4 counties in Michigan. It was in force for 14 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Feb 21, 1997, 8:25 AM EST (13:25 UTC)
Expired
Feb 21, 1997, 10:00 PM EST
In force
14 hr
Issued by
NWS Grand Rapids, MI
Area
Whole counties

Counties Isabella County, MI, Mecosta County, MI, Montcalm County, MI, Newaygo County, MI

The radar

The Grand Rapids radar (KGRR), 75 km from the middle of the area, began a volume at 13:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 1.4 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 12:00Z on 1997-02-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 12:00Z on 1997-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 389 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
514 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
389 m²/s²
0-3 km storm-relative helicity
369 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 KGRR 211325
FFWGRR
MIC073-037-045-057-065-005-015-021-027-067-077-081-117-139-159-
107-121-123-127-220300-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
825 AM EST FRI FEB 21 1

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 21, 8:25 AM ESTFlash Flood WarningGRRAllegan, Barry, Kalamazoo, Kent, Ottawa, Van Buren14 hr
Feb 21, 8:25 AM ESTFlash Flood WarningGRRMuskegon, Oceana14 hr
Feb 21, 8:25 AM ESTFlash Flood WarningGRRClinton, Eaton, Gratiot, Ingham, Ionia14 hr
Feb 21, 8:25 AM ESTFlash Flood WarningGRRBerrien, Cass14 hr
Feb 21, 10:15 AM ESTFlash Flood WarningGRRClare, Lake, Osceola12 hr
Feb 21, 10:15 AM ESTFlash Flood WarningGRRMason12 hr

Nearby

Flash Flood Warnings in Michigan, 1997Every flash flood warning in 1997

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; radar from the NEXRAD Level II archive.