Marine Weather Message
Issued by NWS Detroit/Pontiac, MI

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000
WHUS73 KDTX 220855
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
355 AM EST MON DEC 22 2014

...WAVES BUILDING IN EXCESS OF 4 FEET OVER LAKE HURON...

.A DEVELOPING LOW PRESSURE SYSTEM OVER THE PLAINS TODAY WILL SUPPORT
INCREASING S-SE WINDS ACROSS LAKE HURON. THE LOW WILL SLOWLY ROTATE
INTO THE WESTERN GREAT LAKES TONIGHT INTO TUESDAY. PERSISTENT LOW
LEVEL WARM AIR ADVECTION WILL INCREASE OVER LAKE STABILITY AND THUS
SUPPRESS PEAK WINDS FROM EXCEEDING 25 KNOTS. HOWEVER...WAVES WILL
STILL LIKELY REACH AROUND 4 FEET ACROSS NEARSHORE WATERS OF NORTHERN
THUMB REGION...AND HAVE ISSUED SMALL CRAFT ADVISORIES. THE SURFACE
LOW WILL ACTUALLY WEAKEN AS IT LIFTS INTO THE NORTHERN GREAT LAKES
ON TUESDAY. A SUBSEQUENT WEAKENING IN THE GRADIENT OVER LAKE HURON
WILL LEAD TO A DIMINISHING TREND IN THE WIND AND WAVES TUESDAY INTO
TUESDAY NIGHT. A SECONDARY SURFACE LOW IS FORECAST TO RAPIDLY DEEPEN
AS IT MOVES FROM THE DEEP SOUTH TUESDAY NIGHT AND IN BETWEEN THE
CENTRAL AND EASTERN GREAT LAKES WEDNESDAY. THIS SYSTEM WILL CONTINUE
TO STRENGTHEN AS IT LIFTS NORTHEAST OF THE REGION WEDNESDAY NIGHT.
COLD AIR ADVECTION IN THE WAKE OF THIS SYSTEM WILL POSE THE RISK OF
GALE FORCE WINDS OVER THE LAKES WEDNESDAY NIGHT INTO THURSDAY
MORNING. ENOUGH UNCERTAINTY IN THE STRENGTH AND TRACK OF THIS SYSTEM
REMAINS AT THIS STAGE IN THE FORECAST TO HOLD OFF ON THE ISSUANCE OF
A GALE WATCH.

LHZ421-441-442-222100-
/O.NEW.KDTX.SC.Y.0065.141223T0000Z-141224T0000Z/
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-
355 AM EST MON DEC 22 2014

...SMALL CRAFT ADVISORY IN EFFECT FROM 7 PM THIS EVENING TO 7 PM
EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A
SMALL CRAFT ADVISORY...WHICH IS IN EFFECT FROM 7 PM THIS EVENING
TO 7 PM EST TUESDAY.

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 21 KNOTS FROM THE SOUTHEAST WITH GUSTS
  UP TO 23 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 1 AM TUESDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 11 AM TUESDAY.

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$

SF


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