Marine Weather Message
Issued by NWS Detroit/Pontiac, MI

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000
WHUS73 KDTX 200815
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
415 AM EDT SAT AUG 20 2016

...STRONG LOW PRESSURE TO LIFT INTO THE EASTERN UPPER PENINSULA...

.A LOW PRESSURE SYSTEM WILL DEVELOP OVER WISCONSIN SATURDAY AND
DEEPEN QUICKLY DURING THE EVENING AND OVERNIGHT HOURS OVER FAR
EASTERN LAKE SUPERIOR. SOUTHEASTERLY/SOUTHERLY WINDS WILL INCREASE
TO 15-20 KT SATURDAY AFTERNOON AND TO 25 KT EARLY SATURDAY NIGHT IN
THE WARM SECTOR OVER MUCH OF LAKE HURON. THE STRONGEST WINDS ARE
EXPECTED LATE SATURDAY NIGHT INTO SUNDAY AS A COLD FRONT USHERS IN
COLDER AIR (850 MB TEMPERATURES DOWN TO AROUND 5C OVER NORTHERN LAKE
HURON LATE SUNDAY) ACROSS THE WARM WATERS. THE LOW WILL BE AT ITS
PEAK STRENGTH LATE SATURDAY NIGHT NEAR 990 MB OR POSSIBLY LOWER, WITH
A VERY IMPRESSIVE GRADIENT ADVERTISED. 925 MB WINDS OF 45KT
ADVERTISED BY THE NAM COULD MIX TO THE SURFACE SUNDAY OVER FAR
NORTHERN LAKE HURON WHERE A GALE WARNING IS IN EFFECT. A GALE WATCH
IS IN EFFECT FOR CENTRAL LAKE HURON INTO SAGINAW BAY DUE TO SOME
UNCERTAINTY WITH THE EXACT STRENGTH AND TRACK OF THE LOW. A
SMALL CRAFT ADVISORY MAY BE NEEDED FOR THE SOUTHERN LAKE HURON
NEARSHORE WATERS. WINDS WILL RAPIDLY DIMINISH SUNDAY NIGHT AS HIGH
PRESSURE BUILDS IN.

LHZ361-362-202015-
/O.UPG.KDTX.GL.A.0019.160821T0800Z-160822T0000Z/
/O.NEW.KDTX.GL.W.0023.160821T0800Z-160822T0200Z/
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-
415 AM EDT SAT AUG 20 2016

...GALE WARNING IN EFFECT FROM 4 AM TO 10 PM EDT SUNDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A GALE
WARNING...WHICH IS IN EFFECT FROM 4 AM TO 10 PM EDT SUNDAY.

* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED
  WINDS UP TO 36 KNOTS FROM THE WEST WITH GUSTS UP TO 47 KNOTS.
  THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 11 FEET WITH A
  POTENTIAL MAXIMUM WAVE HEIGHT OF 16 FEET.

* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 11 AM EDT SUNDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 3 PM EDT SUNDAY.

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.

&&

$$

LHZ363-421-422-441-462-202015-
/O.NEW.KDTX.GL.A.0020.160821T0800Z-160821T2000Z/
LAKE HURON FROM STURGEON POINT TO ALABASTER MI BEYOND 5NM OFF
SHORE-
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-
LAKE HURON FROM PORT AUSTIN TO HARBOR BEACH BEYOND 5NM OFF SHORE-
415 AM EDT SAT AUG 20 2016

...GALE WATCH IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
AFTERNOON...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A GALE
WATCH...WHICH IS IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
AFTERNOON.

* WIND AND WAVES: DURING THE GALE WATCH...EXPECT SUSTAINED WINDS
  UP TO 32 KNOTS FROM THE SOUTHWEST WITH GUSTS UP TO 41 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 11 AM EDT SUNDAY
  WITH THE LARGEST WAVES EXPECTED AROUND 3 PM EDT SUNDAY.

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A GALE WATCH IS ISSUED WHEN THE RISK OF GALE FORCE WINDS OF 34 TO
47 KNOTS HAS SIGNIFICANTLY INCREASED...BUT THE SPECIFIC TIMING
AND/OR LOCATION IS STILL UNCERTAIN. IT IS INTENDED TO PROVIDE
ADDITIONAL LEAD TIME FOR MARINERS WHO MAY WISH TO CONSIDER
ALTERING THEIR PLANS.

&&

$$

CB



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