Alert archive / Michigan / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 4, NWS Gaylord, MI

August 4, 1989Montmorency County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 4, 1989, 9:18 PM EDT for Montmorency County, Michigan. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
Aug 4, 1989, 9:18 PM EDT (01:18 UTC)
Expired
Aug 4, 1989, 10:00 PM EDT
In force
42 min
Issued by
NWS Gaylord, MI
Area
Whole counties

County Montmorency 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 00:00Z, 1.3 hours before the alert went out and 161 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 00:00Z on 1989-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 819 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 00:00Z on 1989-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 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
819 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
1330 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KAPN 050118
SVRAPN
MIC119-050200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE ALPENA MI
918 PM EDT FRI AUG 4 1989

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 1000 PM EDT FOR PEOPLE IN THE FOLLOWING 
COUNTY

   IN THE NORTHEAST PART OF LOWER MICHIGAN
      MONTMORENCY

AT (TIME    ) AN (EVENT     ) WAS...............
AT 845 PM EDT POLICE IN GAYLORD IN OTSEGO COUNTY IN NORTH CENTRAL M
ICHIGAN REPORTED A SEVERE THUNDERSTORM WITH POWER LINES AND TREES
DOWN. THIS STORM WAS MOVING EAST AT 25 MILES AN HOUR AND HAS MOVED
INTO MONTMORENCY COUNTY IN NORTHEAST LOWER MICHIGAM.

THIS WARNING IS IN EFFECT UNTIL 10 PM EDT.

IF YOU ARE IN AN AREA THREATENED BY THE STORM..GO TO A REINFORECED
SHELTER AND PREPARE FOR DAMAGING WIND...LARGE HAIL...VERY HEAVY
RAIN AND LIGHTNING.

SHIVELY

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 4, 8:29 PM EDT, 49 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUGHTON LAKE MI
825 PM EDT FRI AUG 4 1989

AT 815 PM EDT...RADAR INDICATED AN AREA OF SHOWERS AND
THUNDERSTORMS MOVING INTO OTSEGO COUNTY IN NORTH CENTRAL
MICHIGAN.

THE SHOWERS AND THUNDERSTORMS WERE LOCATED 50 MILES NORTHWEST
OF HOUGHTON LAKE OR 15 MILES WEST OF GAYLORD.

THE THUNDERSTORMS WERE MOVING EAST SOdUTHEAST AT AROUND 25 MILES AN
HOUR AND WILL LIKELY PRODUCE HEAVY RAIN...GUSTY WINDS AND DANGEROUS
LIGHTNING AND HAIL.
Special weather statement, Aug 4, 9:17 PM EDT, 1 minute before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUGHTON LAKE MI
915 PM EDT FRI AUG 4 1989

AT 910 PM EDT...RADAR INDICATED THUNDERSTORMS MOVING THROUGH
CRAWFORD COUNTY IN NORTH CENTRAL MICHIGAN.

THE THUNDERSTORMS WERE LOCATED 20 MILES NORTHWEST OF HOUGHTON
LAKE OR 7 MILES NORTHWEST OF GRAYLING MOVING EAST SOUTHEAST
AT 25 MILES AN HOUR.

THE THUNDERSTORMS WILL LIKELY PRODUCE STRONG GUSTY WINDS...HAIL AND
DANGEROUS LIGHTNING.

THERE ARE NO TORNADO WATCHES IN EFFECT IN MICHIGAN.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 9:45 PM EDTSevere Thunderstorm WarningAPXAlpena31 min
Aug 4, 9:57 PM EDTSevere Thunderstorm WarningAPXMissaukee, Wexford63 min
Aug 4, 11:18 PM EDTSevere Thunderstorm WarningAPXManistee, Mason57 min
Aug 5, 12:06 AM EDTSevere Thunderstorm WarningAPXMuskegon, Oceana69 min
Aug 5, 12:06 AM EDTSevere Thunderstorm WarningAPXManistee, Mason39 min
Aug 5, 4:45 PM EDTSevere Thunderstorm WarningAPXChippewa, Luce60 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1989Every severe thunderstorm warning in 1989

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.