Alert archive / Michigan / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 23, NWS Gaylord, MI

September 12, 1990Iosco County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Sep 12, 1990, 9:00 PM EDT for Iosco County, Michigan. It was in force for 45 min.

The area

The counties it named.

The facts

Issued: Sep 12, 1990, 9:00 PM EDT (01:00 UTC)
Expired: Sep 12, 1990, 9:45 PM EDT
In force: 45 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 00:00Z, 1.0 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-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: 1095 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1255 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KAPN 130100
SVRAPN
MIC069-130145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE ALPENA MI
900 PM EDT WED SEP 12 1990
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
AND SPECIAL MARINE WARNING FOR THE ADJACENT COASTAL WATERS
EFFECTIVE UNTIL  945 PM EDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN NORTHEAST MICHIGAN
          ...EASTERN IOSCO...INCLUDING THE ADJACENT COASTAL WATERS
 
AT 900 PM EDT RADAR INDICATED A SEVERE THUNDERSTORM OVER THE CITY OF
OSCODA AND IT WAS MOVING SOUTH AT 10 MILES AN HOUR. WURTSMITH A.F.B.
REPORTED A WIND GUST TO 56 MILES AN HOUR WITH THIS STORM.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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, Sep 12, 4:00 PM EDT, 5 hours before

MIZ069-070-083-120440-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAULT STE MARIE MI
1240 AM EDT WED SEP 12 1990

...WET AND WILD FOR EASTERN UPPER MICHIGAN...

AT 1225 AM THUNDERSTORMS WERE STRECHED ACROSS THE EASTERN UPPER
PENINSULA FROM JUST NORTH OF PORT INLAND...IN MACKINAC
COUNTY...NORTH INTO LUCE COUNTY... NORTHEAST INTO WHITEFISH BAY
AND THEN EAST INTO SAULT STE. MARIE. RADAR IN MARQUETTE REPORTED
THESE STORMS MOVING EAST AT 30 MPH.

FREQUENT LIGHTNING...STRONG GUSTY WINDS AND HEAVY RAIN CAN BE
EXPECTED WITH THESE STORMS. PERSONS LIVING IN EASTERN UPPER
MICHIGAN SHOULD BE ON THE ALERT FOR THESE THUNDERSTORMS AND TAKE
COVER IMMEDIATELY.
.

RAWLES

Special weather statement, Sep 12, 8:10 PM EDT, 50 minutes before

MIZ047-048>066-068-130130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ALPENA MI
810 PM EDT WED SEP 12 1990

...SPECIAL MARINE WARNING IS IN EFFECT UNTIL 830 PM FOR WEST SHORE OF
   LAKE HURON FROM SOUTH POINT TO OSCODA...

AT 805 PM...AN INTENSE THUNDERSTORM CONTINUED ON THE SHORELINE NEAR
CEDAR LAKE...HALFWAY BETWEEN HARRISVILLE AND OSCODA...AND IT WAS
MOVING EAST AT ABOUT 10 MILES AN HOUR.

HAIL AND WIND GUSTS TO OVER 40 KNOTS IS LIKELY WITH THIS THUNDERSTORM
UNTIL 830PM. INTENSE LIGHTNING AND EXTREMELY HEAVY RAIN CAN ALSO BE
EXPECTED.
GV

Nearby

Severe Thunderstorm Warnings in Michigan, 1990 Every severe thunderstorm warning in 1990

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.