698  
WHUS73 KDTX 120824  
MWWDTX  
 
URGENT - MARINE WEATHER MESSAGE  
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI  
324 AM EST TUE DEC 12 2017  
   
..STRONG NORTHWEST GALES...HAZARDOUS WAVES
 
AND HEAVY FREEZING  
SPRAY...  
 
.STRONG NORTHWEST GALES WILL PERSIST TODAY WITH GUSTS APPROACHING  
STORM FORCE OVER THE EXPOSED NEARSHORE WATERS OF THE THUMB AND THE  
OPEN WATERS OF CENTRAL AND SOUTHERN LAKE HURON. GALE WARNINGS  
WILL REMAIN IN EFFECT INTO TONIGHT BEFORE WINDS SUBSIDE BY EARLY  
WEDNESDAY MORNING. HEAVY FREEZING SPRAY WARNING WILL REMAIN IN PLACE  
AS WELL AS TEMPERATURES FALL INTO THE TEENS AND SIGNIFICANT WAVE  
HEIGHTS RANGE BETWEEN 10 TO 15 FEET. MAXIMUM WAVE HEIGHTS WILL  
EXCEED 20 FEET.  
 
LHZ362-363-462>464-122115-  
/O.EXT.KDTX.UP.W.0001.171212T0824Z-171213T0900Z/  
/O.CON.KDTX.GL.W.0042.000000T0000Z-171213T1000Z/  
LAKE HURON FROM PRESQUE ISLE LIGHT TO STURGEON POINT MI BEYOND  
5NM OFF SHORE-  
LAKE HURON FROM STURGEON POINT TO ALABASTER MI BEYOND 5NM OFF  
SHORE-  
LAKE HURON FROM PORT AUSTIN TO HARBOR BEACH BEYOND 5NM OFF SHORE-  
LAKE HURON FROM HARBOR BEACH TO PORT SANILAC BEYOND 5NM OFF SHORE-  
LAKE HURON FROM PORT SANILAC TO PORT HURON BEYOND 5NM OFF SHORE-  
324 AM EST TUE DEC 12 2017  
 
...HEAVY FREEZING SPRAY WARNING NOW IN EFFECT UNTIL 4 AM EST  
WEDNESDAY...   
..GALE WARNING REMAINS IN EFFECT UNTIL 5 AM EST WEDNESDAY
 
 
THE HEAVY FREEZING SPRAY WARNING IS NOW IN EFFECT UNTIL 4 AM EST  
WEDNESDAY.  
 
* EXPECT HEAVY FREEZING SPRAY TO OCCUR UNTIL 4 AM EST WEDNESDAY.  
 
* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED  
WINDS UP TO 39 KNOTS FROM THE NORTHWEST WITH GUSTS UP TO 47  
KNOTS. THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 16 FEET  
WITH A POTENTIAL MAXIMUM WAVE HEIGHT OF 23 FEET.  
 
* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 6 AM EST TUESDAY  
WITH THE LARGEST WAVES EXPECTED AROUND 9 AM EST TUESDAY.  
 
REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A HEAVY FREEZING SPRAY WARNING MEANS HEAVY FREEZING SPRAY IS  
EXPECTED TO RAPIDLY ACCUMULATE ON VESSELS. THESE CONDITIONS CAN  
BE EXTREMELY HAZARDOUS TO NAVIGATION. IT IS RECOMMENDED THAT  
MARINERS NOT TRAINED TO OPERATE IN THESE CONDITIONS OR VESSELS  
NOT PROPERLY EQUIPED TO DO SO...REMAIN IN PORT OR AVOID THE  
WARING AREA.  
 
A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR  
OCCURING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES  
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY  
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE  
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.  
 

 
 

 
 
LHZ421-441>443-122115-  
/O.EXT.KDTX.GL.W.0042.171212T0824Z-171213T0900Z/  
/O.EXT.KDTX.UP.W.0001.171212T0824Z-171213T0900Z/  
OUTER SAGINAW BAY SW OF ALABASTER TO PORT AUSTIN MI TO INNER  
SAGINAW BAY-PORT AUSTIN TO HARBOR BEACH MI-  
HARBOR BEACH TO PORT SANILAC MI-PORT SANILAC TO PORT HURON MI-  
324 AM EST TUE DEC 12 2017  
   
..GALE WARNING NOW IN EFFECT UNTIL 4 AM EST WEDNESDAY
 
 
...HEAVY FREEZING SPRAY WARNING NOW IN EFFECT UNTIL 4 AM EST  
WEDNESDAY...  
 
THE HEAVY FREEZING SPRAY WARNING IS NOW IN EFFECT UNTIL 4 AM EST  
WEDNESDAY.  
 
* EXPECT HEAVY FREEZING SPRAY TO OCCUR UNTIL 4 AM EST WEDNESDAY.  
 
THE GALE WARNING IS NOW IN EFFECT UNTIL 4 AM EST WEDNESDAY.  
 
* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED  
WINDS UP TO 34 KNOTS FROM THE NORTHWEST WITH GUSTS UP TO 43  
KNOTS. THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 13 FEET  
WITH A POTENTIAL MAXIMUM WAVE HEIGHT OF 19 FEET.  
 
* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 7 AM EST TUESDAY  
WITH THE LARGEST WAVES EXPECTED AROUND 10 AM EST TUESDAY.  
 
REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A HEAVY FREEZING SPRAY WARNING MEANS HEAVY FREEZING SPRAY IS  
EXPECTED TO RAPIDLY ACCUMULATE ON VESSELS. THESE CONDITIONS CAN  
BE EXTREMELY HAZARDOUS TO NAVIGATION. IT IS RECOMMENDED THAT  
MARINERS NOT TRAINED TO OPERATE IN THESE CONDITIONS OR VESSELS  
NOT PROPERLY EQUIPED TO DO SO...REMAIN IN PORT OR AVOID THE  
WARING AREA.  
 
A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR  
OCCURING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES  
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY  
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE  
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.  
 

 
 

 
 
LHZ361-122115-  
/O.EXT.KDTX.UP.W.0001.171212T0824Z-171213T0900Z/  
/O.CON.KDTX.GL.W.0042.000000T0000Z-171213T0400Z/  
LAKE HURON FROM 5NM EAST OF MACKINAC BRIDGE TO PRESQUE ISLE LT  
BEYOND 5 NM OFF SHORE-  
324 AM EST TUE DEC 12 2017  
 
...HEAVY FREEZING SPRAY WARNING NOW IN EFFECT UNTIL 4 AM EST  
WEDNESDAY...   
..GALE WARNING REMAINS IN EFFECT UNTIL 11 PM EST THIS EVENING
 
 
THE HEAVY FREEZING SPRAY WARNING IS NOW IN EFFECT UNTIL 4 AM EST  
WEDNESDAY.  
 
* EXPECT HEAVY FREEZING SPRAY TO OCCUR UNTIL 4 AM EST WEDNESDAY.  
 
* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED  
WINDS UP TO 31 KNOTS FROM THE NORTHWEST WITH GUSTS UP TO 38  
KNOTS. THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 9 FEET  
WITH A POTENTIAL MAXIMUM WAVE HEIGHT OF 13 FEET.  
 
* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 4 AM EST TUESDAY  
WITH THE LARGEST WAVES EXPECTED AROUND 6 AM EST TUESDAY.  
 
REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A HEAVY FREEZING SPRAY WARNING MEANS HEAVY FREEZING SPRAY IS  
EXPECTED TO RAPIDLY ACCUMULATE ON VESSELS. THESE CONDITIONS CAN  
BE EXTREMELY HAZARDOUS TO NAVIGATION. IT IS RECOMMENDED THAT  
MARINERS NOT TRAINED TO OPERATE IN THESE CONDITIONS OR VESSELS  
NOT PROPERLY EQUIPED TO DO SO...REMAIN IN PORT OR AVOID THE  
WARING AREA.  
 
A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR  
OCCURING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES  
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY  
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE  
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.  
 

 
 

 
 
LHZ422-122100-  
/O.EXT.KDTX.GL.W.0042.171212T0824Z-171212T2100Z/  
INNER SAGINAW BAY SW OF POINT AU GRES TO BAY PORT MI-  
324 AM EST TUE DEC 12 2017  
   
..GALE WARNING NOW IN EFFECT UNTIL 4 PM EST THIS AFTERNOON
 
 
THE GALE WARNING IS NOW IN EFFECT UNTIL 4 PM EST THIS AFTERNOON.  
 
* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED  
WINDS UP TO 30 KNOTS FROM THE NORTHWEST WITH GUSTS UP TO 39  
KNOTS. THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 5 FEET  
WITH A POTENTIAL MAXIMUM WAVE HEIGHT OF 7 FEET.  
 
* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 6 AM EST TUESDAY  
WITH THE LARGEST WAVES EXPECTED AROUND 7 AM EST TUESDAY.  
 
REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR  
OCCURING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES  
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY  
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE  
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.  
 

 
 

 
 
LEZ444-122100-  
/O.EXT.KDTX.GL.W.0042.171212T0824Z-171212T2100Z/  
MICHIGAN WATERS OF LAKE ERIE FROM DETROIT RIVER TO NORTH CAPE MI-  
324 AM EST TUE DEC 12 2017  
   
..GALE WARNING NOW IN EFFECT UNTIL 4 PM EST THIS AFTERNOON
 
 
THE GALE WARNING IS NOW IN EFFECT UNTIL 4 PM EST THIS AFTERNOON.  
 
* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED WINDS  
UP TO 26 KNOTS FROM THE NORTHWEST WITH GUSTS UP TO 35 KNOTS.  
THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 3 FEET WITH A  
POTENTIAL MAXIMUM WAVE HEIGHT OF 4 FEET.  
 
* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 8 AM EST TUESDAY  
WITH THE LARGEST WAVES EXPECTED AROUND 9 AM EST TUESDAY.  
 
REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR  
OCCURING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES  
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY  
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE  
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.  
 

 
 

 
 
LCZ460-122115-  
/O.EXT.KDTX.GL.W.0042.171212T0824Z-171213T0500Z/  
LAKE ST CLAIR-  
324 AM EST TUE DEC 12 2017  
   
..GALE WARNING NOW IN EFFECT UNTIL MIDNIGHT EST TONIGHT
 
 
THE GALE WARNING IS NOW IN EFFECT UNTIL MIDNIGHT EST TONIGHT.  
 
* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED  
WINDS UP TO 29 KNOTS FROM THE NORTHWEST WITH GUSTS UP TO 36  
KNOTS. THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 4 FEET  
WITH A POTENTIAL MAXIMUM WAVE HEIGHT OF 5 FEET.  
 
* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 7 AM EST TUESDAY  
WITH THE LARGEST WAVES EXPECTED AROUND 8 AM EST TUESDAY.  
 
REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR  
OCCURING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES  
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY  
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE  
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.  
 

 
 

 
 
SF  
 
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