Alert archive / Michigan / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 16, NWS Gaylord, MI

August 8, 1986Iosco County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 8, 1986, 4:36 PM EDT for Iosco County, Michigan. It was in force for 59 min.

The area

The counties it named.

The facts

Issued
Aug 8, 1986, 4:36 PM EDT (20:36 UTC)
Expired
Aug 8, 1986, 5:35 PM EDT
In force
59 min
Issued by
NWS Gaylord, MI
Area
Whole counties

County Iosco 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 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 1986-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1078 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 1986-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 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
1078 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
650 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
55 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 082039 COR
SVRAPN
MIC069-082145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE ALPENA MI
436 PM EDT FRI AUG 8 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND
SPECIAL MARINE WARNING EFFECTIVE UNTIL 545 PM EDT FOR PEOPLE IN THE
FOLLOWING COUNTY OF

NORTHEAST LOWER MICHIGAN...IOSCO COUNTY AND THE ADJACANT WATERS OF
LAKE HURON FROM OSCODA TO ALABASTER.

AT 330 PM EDT..RADAR SHOWED A SEVERE THUNDERSTORM 5 MILES WEST OF
WHITTEMORE IN IOSCO COUNTY MOVING EAST AT 35 MILES AN HOUR. THIS
STORM WILL REACH THE LAKE HURON COAST BY 4 PM EDT. BOATERS FROM
OSCODA TO SHOULD TAKE SHELTER IMMEDIATELY.

IF YOU ARE IN THE PATH OF THIS STORM..MOVE TO A PLACE OF SAFETY.
SEVERE THUNDERSTORMS PRODUCE STRONG DAMAGING WIND..LARGE HAIL..
VERY HEAVY RAIN..AND FREQUENT LIGHTNING. THEY SOMETIMES SPAWN A
TORNADO WITH LITTLE OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT.

STAY TUNED TO YKOUR LOCAL RADIO OR TELEVISION STATION..OR TO NOAA
WEATHER RADIO FOR THE LATEST INFORMATION.
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

Local storm report, Aug 8, 3:26 PM EDT, 1 hour 10 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE ALPENA MI
320 PM EDT FRI AUG 8 1986

AT 130 PM EDT THE PRESQUE ISLE COUNTY SHERIFF RECEIVED A REPORT OF A
TORNADO TOUCH DOWN IN DOWNTOWN ROGERS CITY MICHIGAN...AT ST. CLAIR AND
FIRST STREETS. A STORAGE SHED WAS DESTROYED...A VERY LARGE TREE
UPROOTED AND A WINDOW BLOWN OUT OF THE HOUSE DOOR.

WE CONTACTED AN EYE WITNESS...FRANK DERRY...659 SOUTH FIRST STREET...
WHO SAW THE TORNADO FUNNEL APPROACH FROM THE NORTHWEST...TOUCH DOWN AND
MOVE TO THE EAST OVER LAKE HURON. HE ALSO REPORTED VERY HEAVY RAIN AND
1/2 INCH HAIL WITH THE STORM. BRANCHES AND PARTS OF THE STORAGE SHED
WERE VISIBLE 100 FEET IN THE AIR.

AN UNCONFIRMED REPORT OF A FUNNEL CLOUD SIGHTING AT GRAND LAKE...
16 NORTH OF APN...WAS ALSO RECEIVED AT WSO ALPENA.

BOTH REPORTS WERE MUCH TO LATE FOR ISSUANCE OF WARNINGS...THE STORMS
WERE WELL OUT OVER LAKE HURON WHEN THE REPORTS WERE RECEIVED.

CURTIS

Nearby

Severe Thunderstorm Warnings in Michigan, 1986Every severe thunderstorm 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.