Marine Weather Message
Issued by NWS Detroit/Pontiac, MI

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709
WHUS73 KDTX 230903
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
403 AM EST THU FEB 23 2017

...ELEVATED WAVES ALONG THE THUMB LATE TONIGHT THROUGH FRIDAY...

.LOW PRESSURE WILL LIFT NORTHEAST OF LAKE HURON EARLY THIS MORNING
AND WILL DRIVE A COLD FRONT ACROSS THE LAKE LATER THIS MORNING. THE
FRONT WILL SETTLE INTO LAKE ERIE THIS AFTERNOON. THE STRENGTH OF THE
PREFRONTAL SOUTHERLY WINDS EARLY THIS MORNING ARE BEING LIMITED BY
STRONG OVER LAKE STABILITY. NEUTRAL TO SLIGHTLY UNSTABLE CONDITIONS
WILL DEVELOP ACROSS LAKE HURON DURING THE DAY WITHIN POST FRONTAL
COLD AIR ADVECTION UNDER NORTH-NORTHWEST WINDS. THESE WINDS SHOULD
PRIMARILY REMAIN BELOW 20 KNOTS AS THE GRADIENT RELAXES.

THE COLD FRONT WILL PUSH SOUTH OF LAKE ERIE DURING THE EVENING
BEFORE LIFTING BACK NORTH AS A WARM FRONT LATE TONIGHT INTO FRIDAY.
THIS WILL OCCUR AS LOW PRESSURE LIFTS INTO THE MIDWEST. THE EASTERLY
GRADIENT WILL TIGHTEN TO THE NORTH OF THE WARM FRONT, RESULTING IN
GUSTY WINDS ACROSS LAKE HURON ON FRIDAY. THERE IS HIGH PROBABILITY
THAT EASTERLY GUSTS ACROSS NRN AND CNTL LAKE HURON WILL REACH 30
KNOTS FRIDAY, WITH LOWER PROBABILITIES FOR A BRIEF PERIOD OF GUSTS
TO GALE FORCE. THE LOW IS FORECAST TO WEAKEN A LITTLE AS IT LIFTS
ACROSS LOWER MI FRIDAY NIGHT. THIS SYSTEM WILL PROVIDE A GOOD CHANCE
FOR THUNDERSTORMS, ESPECIALLY ACROSS LAKES ST CLAIR AND ERIE WITHIN
THE WARM SECTOR. THE DEPARTURE OF THE LOW TO THE NORTHEAST ON
SATURDAY WILL BRING COLDER AIR INTO THE REGION WITHIN GUSTY WEST-
SOUTHWEST WINDS. THE STRONGEST WINDS ARE EXPECTED SAT NIGHT, WHERE
GUSTS TO GALE FORCE ARE POSSIBLE.

LHZ421-441-232115-
/O.NEW.KDTX.SC.Y.0010.170224T0900Z-170225T0300Z/
OUTER SAGINAW BAY SW OF ALABASTER TO PORT AUSTIN MI TO INNER
SAGINAW BAY-PORT AUSTIN TO HARBOR BEACH MI-
403 AM EST THU FEB 23 2017

...SMALL CRAFT ADVISORY IN EFFECT FROM 4 AM TO 10 PM EST FRIDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A
SMALL CRAFT ADVISORY...WHICH IS IN EFFECT FROM 4 AM TO 10 PM EST
FRIDAY.

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 21 KNOTS FROM THE NORTHEAST WITH GUSTS
  UP TO 23 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 9 AM EST FRIDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 3 PM EST 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.

&&

$$

LHZ361>363-231200-
/O.CON.KDTX.MF.Y.0004.000000T0000Z-170223T1200Z/
LAKE HURON FROM 5NM EAST OF MACKINAC BRIDGE TO PRESQUE ISLE LT
BEYOND 5 NM OFF SHORE-
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-
403 AM EST THU FEB 23 2017

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 7 AM EST THIS
MORNING...

* EXPECT DENSE FOG WITH VISIBILITIES OF ONE QUARTER OF A MILE OR
  LESS UNTIL 7 AM EST THIS MORNING.

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE MILE. INEXPERIENCED MARINERS, ESPECIALLY
THOSE OPERATING SMALLER VESSELS, SHOULD AVOID NAVIGATING IN THESE
CONDITIONS.

&&

$$

JVC



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