Marine Weather Message
Issued by NWS Detroit/Pontiac, MI

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875
WHUS73 KDTX 170800
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
400 AM EDT THU AUG 17 2017

...INCREASING SOUTHEAST WINDS BUILDING WAVE HEIGHTS...

.THE COMBINATION OF LOW PRESSURE LIFTING INTO UPPER MICHIGAN TODAY
AND DEPARTING HIGH PRESSURE TO THE EAST OF THE REGION WILL SUPPORT
INCREASING SOUTHEAST WINDS DURING THE COURSE OF THE DAY. AN
ASSOCIATED WARM FRONT WILL LIFT INTO LAKE HURON BY EVENING, WHICH
WILL ONLY ACT TO ENHANCE THE S-SE PRESSURE GRADIENT. GUSTS ACROSS
THE OPEN WATERS OF LAKE HURON WILL TOP 25 KNOT AT TIMES TODAY, WHILE
THE WARM FRONT PROVIDES SHOWERS AND THUNDERSTORMS. RAINFALL FROM
THIS CONVECTION WILL BE QUITE HEAVY AND WILL SIGNIFICANTLY REDUCE
VISIBILITY. WINDS WILL VEER TO THE SOUTHWEST TONIGHT AS THE SURFACE
LOW PASSING ACROSS THE NORTHERN GREAT LAKES DRIVES AN ASSOCIATED
COLD FRONT ACROSS THE LAKES. POST FRONTAL COLD AIR ADVECTION WILL
BOOST THE OVER-LAKE INSTABILITY PROFILE, THUS CAUSING GUSTY WINDS
AND HAZARDOUS SMALL CRAFT CONDITIONS THAT WILL PERSIST THROUGH THE
DAY FRIDAY. WINDS AND WAVES WILL THEN DECREASE OVER THE WEEKEND AS
THE GRADIENT RELAXES.

LHZ421-422-172015-
/O.EXB.KDTX.SC.Y.0055.170818T1400Z-170819T0000Z/
OUTER SAGINAW BAY SW OF ALABASTER TO PORT AUSTIN MI TO INNER
SAGINAW BAY-INNER SAGINAW BAY SW OF POINT AU GRES TO BAY PORT MI-
400 AM EDT THU AUG 17 2017

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM TO 8 PM EDT FRIDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A
SMALL CRAFT ADVISORY WHICH IS IN EFFECT FROM 10 AM TO 8 PM EDT
FRIDAY.

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 21 KNOTS FROM THE SOUTHWEST WITH GUSTS
  UP TO 27 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 10 AM EDT FRIDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 11 AM EDT FRIDAY.

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.

&&

$$

LHZ441-442-172015-
/O.CON.KDTX.SC.Y.0055.170817T1500Z-170819T0000Z/
PORT AUSTIN TO HARBOR BEACH MI-HARBOR BEACH TO PORT SANILAC MI-
400 AM EDT THU AUG 17 2017

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING
TO 8 PM EDT FRIDAY...

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 21 KNOTS FROM THE SOUTHWEST WITH GUSTS
  UP TO 27 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 11 AM EDT FRIDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 6 PM EDT THURSDAY.

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.

&&

$$

DRK



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