Alert archive / Michigan / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 21, NWS Gaylord, MI

August 10, 1993Alpena County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 10, 1993, 4:04 PM EDT for Alpena County, Michigan. It was in force for 41 min.

The area

The counties it named.

The facts

Issued: Aug 10, 1993, 4:04 PM EDT (20:04 UTC)
Expired: Aug 10, 1993, 4:45 PM EDT
In force: 41 min
Issued by: NWS Gaylord, MI
Area: Whole counties

County Alpena County, MI

The nearest sounding before it

Sault Ste Marie, MI (KY62), launched 12:00Z, 8.1 hours before the alert went out and 169 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: 504 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 518 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.1
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 102006 RRA
SVRAPN
MIC007-MIZ509-102045-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE ALPENA MI
404 PM EDT TUE AUG 10 1993
 
THE NATIONAL WEATHER SERVICE IN ALPENA HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL  445 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHEAST LOWER MICHIGAN
 
   ...ALPENA COUNTY
 
  AND FOR MARINE INTERESTS ON COASTAL WATERS AROUND...
 
  ...MIDDLE ISLAND TO OSSINEKE
 
AT 407 PM... NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM NEAR LONG LAKE... OR ABOUT 8 MILES NORTH OF ALPENA.
 
THIS STORM WAS MOVING SLOWLY SOUTH AT 15 MILES AN HOUR... AND
WILL BE MOVING JUST EAST OF THE CITY OF ALPENA BY 420 AM.
 
IF YOU LIVE IN THE LONG LAKE AREA... OR EAST OF ALPENA... FIND
SHELTER NOW.
 
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.
 
ALL MARINERS ON LAKE HURON... SOUTH OF MIDDLE ISLAND... SHOULD:
GET TO SAFE HARBOR NOW. ROUGH WATERS AND GUSTY WINDS ARE LIKELY
WITH THIS STORM.
 
CAMPBELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 3:30 PM EDT	Severe Thunderstorm Warning	APX	Montmorency	45 min
Aug 10, 4:49 PM EDT	Severe Thunderstorm Warning	APX	Alpena	41 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1993 Every severe thunderstorm warning in 1993

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.