Alert archive / Michigan / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 21, NWS Detroit, MI

July 18, 1986Huron County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jul 18, 1986, 6:54 PM EDT for Huron County, Michigan. It was in force for 66 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 18, 1986, 6:54 PM EDT (22:54 UTC)
Expired: Jul 18, 1986, 8:00 PM EDT
In force: 66 min
Issued by: NWS Detroit, MI
Area: Whole counties

County Huron County, MI

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jul 18, 7:00 PM EDT	Thunderstorm Wind 0	Huron, MI

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Detroit, MI (KFNT), launched 12:00Z, 10.9 hours before the alert went out and 140 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1483 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 879 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFNT 182257 COR
SVRFNT
MIC063-190000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING CORRECTION
NATIONAL WEATHER SERVICE FLINT MI
654 PM EDT FRI JUL 18 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 800 PM EDT FOR PEOPLE IN THE FOLLOWING
COUNTY OF

EAST CENTRAL LOWER MICHIGAN... HURON

RADAR INDICATED HEAVY THUNDERSTORMS MOVING IN TO HURON COUNTY
FROM SAGINAW BAY.
WINDS OF 65 MPH HAVE BEEN REPORTED.

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

BURNS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 4:55 PM EDT	Severe Thunderstorm Warning	DTX	Roscommon	60 min
Jul 18, 5:00 PM EDT	Tornado Warning	DTX	Roscommon	60 min
Jul 18, 7:22 PM EDT	Severe Thunderstorm Warning	DTX	Sanilac, Tuscola	38 min
Jul 18, 7:57 PM EDT	Severe Thunderstorm Warning	DTX	Huron, Sanilac, Tuscola	63 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1986 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.