Marine Weather Message
Issued by NWS Detroit/Pontiac, MI

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000
WHUS73 KDTX 290748
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
348 AM EDT THU SEP 29 2016

...PROLONGED EASTERLY WINDS GENERATING LARGE WAVES...

.A DIFFUSE PRESSURE GRADIENT HAS BEEN IN PLACE OVER SOUTHEASTERN
MICHIGAN TONIGHT AS THE UPPER LEVEL LOW CONTINUES TO WORK SOUTHWARD.
THIS HAS LEAD TO A RELATIVELY WEAKER WIND FIELD SO FAR. THE UPPER
LEVEL LOW WILL EVENTUALLY CENTER OVER KENTUCKY TODAY ALLOWING THE
EASTERLY WINDS TO INCREASE IN SPEED. THE UPPER LEVEL PATTERN WILL
REMAIN FAIRLY STAGNANT INTO THE WEEKEND LEADING TO PROLONGED PERIOD
OF NORTHEAST WINDS IN THE 15 TO 25 KNOT RANGE. SMALL CRAFT
ADVISORIES REMAIN IN EFFECT FOR ALL MARINE AREAS INTO LATE FRIDAY
NIGHT DUE TO LARGE WAVES AND GUSTY WINDS. THE AREA OF LOW PRESSURE
WILL LIFT BACK NORTHWARD INTO MICHIGAN LATE FRIDAY NIGHT INTO
SATURDAY. THIS WILL DECREASE THE SURFACE PRESSURE GRADIENT AND TURN
WINDS MORE TO THE EAST, ALLOWING WIND SPEEDS AND WAVE HEIGHTS TO
DECREASE OVERNIGHT.

MOISTURE WILL MEANWHILE CONTINUE TO WRAP AROUND THE AREA OF LOW
PRESSURE INTO THE WEEKEND, PROVIDING NUMEROUS SHOWERS BUT ONLY A LOW
CHANCE FOR THUNDERSTORMS. THE COOL AIRMASS WILL PROVIDE A CHANCE FOR
WATERSPOUTS AGAIN TODAY AS THE COLDER AIR RESIDES OVER THE WARM LAKE
WATERS.

LHZ421-441>443-292000-
/O.EXT.KDTX.SC.Y.0055.000000T0000Z-161001T0900Z/
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-
348 AM EDT THU SEP 29 2016

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 5 AM EDT SATURDAY...

THE SMALL CRAFT ADVISORY IS NOW IN EFFECT UNTIL 5 AM EDT
SATURDAY.

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 29 KNOTS FROM THE EAST WITH GUSTS UP TO
  32 KNOTS. THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 7
  FEET WITH A POTENTIAL MAXIMUM WAVE HEIGHT OF 10 FEET.

* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 3 AM EDT
  THURSDAY WITH THE LARGEST WAVES EXPECTED AROUND 10 AM 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.

&&

$$

LHZ422-292000-
/O.CON.KDTX.SC.Y.0055.000000T0000Z-161001T0400Z/
INNER SAGINAW BAY SW OF POINT AU GRES TO BAY PORT MI-
348 AM EDT THU SEP 29 2016

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EDT
FRIDAY NIGHT...

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 23 KNOTS FROM THE NORTHEAST WITH GUSTS
  UP TO 32 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 12 PM EDT
  THURSDAY WITH THE LARGEST WAVES EXPECTED AROUND 11 AM 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.

&&

$$

LCZ460-LEZ444-292000-
/O.CON.KDTX.SC.Y.0055.160929T1200Z-161001T0400Z/
LAKE ST. CLAIR-
MICHIGAN WATERS OF LAKE ERIE FROM DETROIT RIVER TO NORTH CAPE MI-
348 AM EDT THU SEP 29 2016

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING
TO MIDNIGHT EDT FRIDAY NIGHT...

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 22 KNOTS FROM THE EAST WITH GUSTS UP TO
  27 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 4 AM EDT FRIDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 4 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.

&&

$$

SF



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