Marine Weather Message
Issued by NWS Detroit/Pontiac, MI

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WHUS73 KDTX 300751
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
351 AM EDT SUN APR 30 2017

...GUSTY NORTHEASTERLY WINDS TODAY AND TONIGHT...

.UNSETTLED CONDITIONS WILL CONTINUE THROUGH THE EARLY PART OF THIS
WEEK AS A STRONG LOW PRESSURE SYSTEM LIFTS OUT OF THE CENTRAL PLAINS
AND TRACKS THROUGH THE WESTERN AND NORTHERN GREAT LAKES. A TIGHT
SURFACE GRADIENT BETWEEN THE APPROACHING LOW AND A LARGE DOME OF
HIGH PRESSURE OVER ONTARIO AND QUEBEC WILL MAINTAIN STRONG EASTERLY
WINDS TODAY. THESE WINDS WILL GRADUALLY EASE FROM SOUTH TO NORTH
DURING THE LATE AFTERNOON AND EVENING AS THE LOW DRAWS CLOSER AND
THE GRADIENT WEAKENS. LARGE WAVES GENERATED BY THESE WINDS WILL BE
SLOWER TO SUBSIDE OVER SAGINAW BAY AND OFF THE TIP OF THE NORTHERN
THUMB, WITH LARGE WAVES LASTING THROUGH LATE TONIGHT.

WINDS WILL TURN SOUTHERLY AND INCREASE ONCE AGAIN ON MONDAY AS LOW
PRESSURE LIFTS WEST OF LAKE MICHIGAN. GUSTS AS HIGH AS 30 KNOTS LOOK
TO DEVELOP BY AFTERNOON AND CONTINUE THROUGH THE OVERNIGHT HOURS.
WINDS ARE EXPECTED TO SHIFT TO THE WEST BEHIND A COLD FRONT ON
TUESDAY, WITH WINDY CONDITIONS PERSISTING THROUGH TUESDAY NIGHT.

IN ADDITION TO THE EXTENDED PERIOD OF GUSTY WINDS AND LARGE WAVES,
THIS LOW PRESSURE SYSTEM WILL KEEP A WET AND ACTIVE PATTERN OVER THE
GREAT LAKES THROUGH THE EARLY PART OF THE WEEK. THUNDERSTORMS AND
PERIODS OF HEAVY RAIN WILL BE POSSIBLE THROUGH LATE MONDAY MORNING,
WITH SHOWERS LASTING INTO TUESDAY.

LEZ444-301300-
/O.EXT.KDTX.SC.Y.0034.000000T0000Z-170430T1300Z/
MICHIGAN WATERS OF LAKE ERIE FROM DETROIT RIVER TO NORTH CAPE MI-
351 AM EDT SUN APR 30 2017

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 9 AM EDT THIS
MORNING...

THE SMALL CRAFT ADVISORY IS NOW IN EFFECT UNTIL 9 AM EDT THIS
MORNING.

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 25 KNOTS FROM THE EAST WITH GUSTS UP TO
  27 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 3 AM EDT SUNDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 6 AM EDT SUNDAY.

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.

&&

$$

LHZ443-301600-
/O.EXT.KDTX.SC.Y.0034.000000T0000Z-170430T1600Z/
PORT SANILAC TO PORT HURON MI-
351 AM EDT SUN APR 30 2017

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL NOON EDT TODAY...

THE SMALL CRAFT ADVISORY IS NOW IN EFFECT UNTIL NOON EDT TODAY.

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 23 KNOTS FROM THE EAST 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 8 AM EDT SUNDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 9 AM EDT SUNDAY.

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.

&&

$$

LHZ421-422-441-302000-
/O.CON.KDTX.SC.Y.0034.000000T0000Z-170501T1000Z/
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-
PORT AUSTIN TO HARBOR BEACH MI-
351 AM EDT SUN APR 30 2017

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 6 AM EDT MONDAY...

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 27 KNOTS FROM THE EAST WITH GUSTS UP TO
  32 KNOTS. THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 8
  FEET WITH A POTENTIAL MAXIMUM WAVE HEIGHT OF 11 FEET.

* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 8 AM EDT SUNDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 9 AM EDT SUNDAY.

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.

&&

$$

LHZ442-302000-
/O.CON.KDTX.SC.Y.0034.170430T0800Z-170430T2000Z/
HARBOR BEACH TO PORT SANILAC MI-
351 AM EDT SUN APR 30 2017

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 4 PM EDT THIS
AFTERNOON...

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 24 KNOTS FROM THE NORTHEAST 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 5 AM EDT SUNDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 12 PM EDT SUNDAY.

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.

&&

$$

SC


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