Alert archive / Michigan / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 13, NWS Marquette, MI

July 18, 1986Schoolcraft County, Michigan

NWS Marquette, MI issued this severe thunderstorm warning at Jul 18, 1986, 1:05 PM EDT for Schoolcraft County, Michigan. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Jul 18, 1986, 1:05 PM EDT (17:05 UTC)
Expired
Jul 18, 1986, 2:00 PM EDT
In force
55 min
Issued by
NWS Marquette, MI
Area
Whole counties

County Schoolcraft 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, 5.1 hours before the alert went out and 152 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 1986-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 412 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 1986-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
412 J/kg
Mixed-layer CIN
-262 J/kg
Mixed-layer LCL
562 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
211 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMQT 181705
SVRMQT
MIC041-153-103-003-181800-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MARQUETTE MI
105 PM EDT FRI JUL 18 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 200 PM EDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

NORTH CENTRAL UPPER MICHIGAN...NORTHERN DELTA...CENTRAL SOUTH 
 SCHOOLCRAFT...SOUTHERN MARQUETTE AND SOUTHERN ALGER

AT PM EDT NATIONAL SERVICE RADAR INDICATED A LINE OF SEVERE
THUNDESTORMS FROM PALMER TO TRENARY TO SENEY IN UPPER MICHIGAN
MOVING TOWARD THE SOUTHEAST AT 40 MILES AN HOUR.

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.

REPORT ALL SEVERE WEATHER SIGHTINGS TO YOUR NEAREST LAW
ENFORCEMENT AGENCY AND ASK THEM TO RELAY IT TO THE NATIONAL
WEATHER SERVICE.

 BM

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, Jul 18, 12:38 PM EDT, 27 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MARQUETTE MI
1235 PM EDT FRI JUL 18 1986

AT 1229 PM EDT A 10 MILE WIDE LINE OF THUNDERSTORMS WAS FROM
JUST SOUTH OF PALMER TO EAST OF TRENARY TO WHITEFISH BAY IN UPPER
MICHIGAN.

THIS LINE OF THUNDERSTORMS WAS MOVING TO THE SOUTHEAST AT 40 MILES
AN HOUR AND WILL BE ACCOMPANIED BY GUSTY WINDS..HEAVY RAINS AND
POSSIBLE SMALL HAIL

PERSONS IN SOUTHERN MARQUETTE..SOUTHERN ALGER..NORTHERN DELTA..
AND THE SOUTH HALF OF SCHOOLCRAFT COUNTIES SHOULD BE ON THE ALERT FOR
THREATENING WEATHER AND PASS ANY SEVERE WEATHER REPORTS TO
THE NEAREST LAW ENFORCENMENT AGENCY.

BM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 1:05 PM EDTSevere Thunderstorm WarningMQTAlger, Delta, Marquette55 min
Jul 18, 2:05 PM EDTSevere Thunderstorm WarningMQTDelta, Marquette55 min
Jul 18, 2:59 PM EDTSevere Thunderstorm WarningMQTDelta, Marquette61 min
Jul 18, 3:45 PM EDTFlash Flood WarningMQTAlger, Delta, Marquette6 hr
Jul 18, 4:04 PM EDTSevere Thunderstorm WarningMQTDelta, Menominee56 min
Jul 18, 4:59 PM EDTSevere Thunderstorm WarningMQTDickinson, Menominee61 min

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.