Alert archive / Michigan / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 21, NWS Gaylord, MI

July 11, 1987Kalkaska County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Jul 11, 1987, 6:22 PM EDT for Kalkaska County, Michigan. It was in force for 23 min.

The area

The counties it named.

The facts

Issued
Jul 11, 1987, 6:22 PM EDT (22:22 UTC)
Expired
Jul 11, 1987, 6:45 PM EDT
In force
23 min
Issued by
NWS Gaylord, MI
Area
Whole counties

County Kalkaska 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

Sault Ste Marie, MI (KSSM), launched 12:00Z, 10.4 hours before the alert went out and 208 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, Sault Ste Marie, MI at 12:00Z on 1987-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 271 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, Sault Ste Marie, MI at 12:00Z on 1987-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 square meters per square second.1939Sfc1 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
271 J/kg
Mixed-layer CIN
-174 J/kg
Mixed-layer LCL
698 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMKG 112222
SVRMKG
MIC079-112245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MUSKEGON MI
622 PM EDT SAT JUL 11 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 645 PM EDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

NORTHWEST LOWER MICHIGAN...NORTHERN KALKASKA

AT 615 PM EDT RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES
NORTHEAST OF TRAVERSE CITY...5 MILES WEST OF BEL8LAIRE IN ANTRIM
COUNTY...MOVING TOWARD THE SOUTHEAST AT 50 MPH.

 THIS IS A DANGEROUS STORM AND PERSONS IN NORTH KALKASKA AND WEST
 ANTRIM COUNTY SHOULD SEEK SHELTER FROM THE APPROACH OF THIS STORM.

GALLOWAY

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 5:55 PM EDTSevere Thunderstorm WarningAPXMackinac65 min
Jul 11, 6:00 PM EDTSevere Thunderstorm WarningAPXAntrim60 min
Jul 11, 6:00 PM EDTSevere Thunderstorm WarningAPXLeelanau60 min
Jul 11, 6:40 PM EDTTornado WarningAPXChippewa30 min
Jul 11, 6:44 PM EDTSevere Thunderstorm WarningAPXPresque Isle61 min
Jul 11, 7:03 PM EDTSevere Thunderstorm WarningAPXMontmorency, Oscoda57 min
Jul 11, 7:19 PM EDTSevere Thunderstorm WarningAPXAlcona46 min
Jul 11, 7:19 PM EDTSevere Thunderstorm WarningAPXAlpena76 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1987Every severe thunderstorm warning in 1987

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.