Marine Weather Message
Issued by NWS Detroit/Pontiac, MI

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000
WHUS73 KDTX 220742
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
342 AM EDT TUE AUG 22 2017

...INCREASING NORTHWEST WINDS LATE THIS AFTERNOON...

.MODERATE SOUTHWEST WIND WILL CONTINUE OVER MARINE AREAS DURING THE
MORNING AHEAD OF A STRENGTHENING LOW PRESSURE SYSTEM AND COLD FRONT.
EARLY MORNING OBSERVATIONS OVER THE SOUTHERN GREAT LAKES INDICATE
WIND CONDITIONS HOLDING BELOW SCA THRESHOLDS LEAVING WIDESPREAD
SHOWERS AND THUNDERSTORMS ALONG AND AHEAD OF THE FRONT AS THE
PRIMARY MARINE WEATHER IMPACT BEFORE THE FRONTAL PASSAGE. SAGINAW
BAY WILL BE AN AREA TO WATCH FOR FUNNELING OF ENHANCED SOUTHWEST
FLOW THAT COULD PRODUCE GUSTS AROUND 25 KNOTS AT TIMES.

LOW PRESSURE NEAR THE STRAITS DURING THE MORNING WILL MOVE TOWARD
JAMES BAY AND DEEPEN CONSIDERABLY DURING THE AFTERNOON BASED ON THE
LATEST MODEL DEPICTIONS. THE STRONGER TREND ON THIS SYSTEM NOW MAKES
NORTHWEST GALES LIKELY OVER THE OPEN WATERS OF NORTHERN LAKE HURON
BEGINNING LATE AFTERNOON THROUGH TONIGHT AND A GALE WARNING IS IN
EFFECT DURING THIS TIME. WAVES EXCEEDING SCA THRESHOLD WILL BRUSH
THE NORTHERN THUMB TONIGHT WHERE A SCA IS IN EFFECT. ELSEWHERE, THE
WIND PATTERN WILL BE FROM THE NORTHWEST ENOUGH TO KEEP THE HIGHEST
WAVES OFFSHORE OF THE SOUTHERN LAKE HURON NEARSHORE ZONES AND
GENERALLY IN THE 1 TO 3 FT RANGE ON SAGINAW BAY BEFORE THE WIND
WEAKENS WEDNESDAY AND THEN VEERS TOWARD THE NORTH THURSDAY. AS THE
WIND DIMINISHES, THE INCOMING AIR MASS WILL BE COLD ENOUGH TO
PRODUCE INSTABILITY OVER THE WATER ADEQUATE FOR MARGINAL WATERSPOUT
POTENTIAL.

LHZ361-362-221945-
/O.NEW.KDTX.GL.W.0025.170822T2100Z-170823T0900Z/
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-
342 AM EDT TUE AUG 22 2017

...GALE WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 AM EDT
WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A GALE
WARNING WHICH IS IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 AM EDT
WEDNESDAY.

* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED
  WINDS UP TO 27 KNOTS FROM THE NORTHWEST WITH GUSTS UP TO 37
  KNOTS. THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 9 FEET
  WITH A POTENTIAL MAXIMUM WAVE HEIGHT OF 13 FEET.

* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 7 PM EDT TUESDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 12 AM EDT WEDNESDAY.

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR
OCCURING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.

&&

$$

LHZ441-221945-
/O.NEW.KDTX.SC.Y.0056.170823T0000Z-170823T0900Z/
PORT AUSTIN TO HARBOR BEACH MI-
342 AM EDT TUE AUG 22 2017

...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 5 AM
EDT WEDNESDAY...

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

* WIND AND WAVES: DURING THE SMALL CRAFT ADVISORY...EXPECT
  SUSTAINED WINDS UP TO 20 KNOTS FROM THE NORTHWEST 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 PM EDT TUESDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 11 PM EDT 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.

&&

$$

BT


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