Alert archive / Michigan / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 21, NWS Grand Rapids, MI

August 6, 1993Kent County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 6, 1993, 4:34 PM EDT for Kent County, Michigan. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
Aug 6, 1993, 4:34 PM EDT (20:34 UTC)
Expired
Aug 6, 1993, 5:15 PM EDT
In force
41 min
Issued by
NWS Grand Rapids, MI
Area
Whole counties

County Kent County, MI

The nearest sounding before it

Detroit, MI (KFNT), launched 12:00Z, 8.6 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 1993-08-06Temperature 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 12:00Z on 1993-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1387 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
63 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 
WUUS1 KGRR 062035 RRA
SVRGRR
MIC081-062115-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
434 PM EDT FRI AUG 6 1993
 
THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  515 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST MICHIGAN
 
   ...KENT COUNTY
 
AT 429 PM EDT SPOTTERS REPORTED 3/4 INCH DIAMETER HAIL FALLING IN GRAND
RAPIDS... ON US-131 ON THE S CURVE. THERE WAS ALSO REPORTS OF 3/4 INCH
DIAMETER HAIL FALLING NEAR 14 MILE ROAD... NEAR CEDAR SPRINGS... 20
MILES NORTH OF GRAND RAPIDS. 1/2 TO 3/4 INCH DIAMETER HAIL WAS REPORTED
IN DOWNTOWN CEDAR SPRINGS. THE THUNDERSTORMS IN KENT COUNTY HAVE SLOWED
THEIR MOVEMENT... AND WERE MOVING NORTHEAST AT 10 MPH. THIS WARNING
REPLACES THE PREVIOUS WARNING FOR KENT COUNTY... AND DROPS MONTCALM
COUNTY FROM THE WARNING.
 
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL AND
DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...
PREFERABLY INSIDE A STRONG BUILDING. STAY AWAY FROM WINDOWS.
 
 
 
&

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 4:05 PM EDTSevere Thunderstorm WarningGRRKent, Montcalm40 min
Aug 6, 4:57 PM EDTSevere Thunderstorm WarningGRRAllegan, Barry48 min
Aug 6, 5:15 PM EDTSevere Thunderstorm WarningGRRKent15 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1993Every severe thunderstorm warning in 1993

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.