Gale Warning 44, NWS Detroit, MI

354 
WHUS73 KDTX 250303
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1003 PM EST SUN DEC 24 2017

...GALES AND HEAVY FREEZING SPRAY TONIGHT THROUGH TOMORROW NIGHT...

.STRONG NORTHWEST WINDS WILL GUST TO GALES OVER THE SOUTHERN BASIN OF 
LAKE HURON TONIGHT AND WILL DEVELOP NORTHWARD TOMORROW. THEREFORE A 
GALE WARNING IS IN EFFECT FOR ALL OF LAKE HURON EXCEPT FOR INNER 
SAGINAW BAY. MODERATE FREEZING SPRAY WILL BE WIDESPREAD. SNOW 
SQUALLS WILL BE COMMON ACROSS THE WATERS AS COLDER AIR SPREADS INTO 
THE GREAT LAKES. BUILDING HIGH PRESSURE WILL ALLOW WINDS TO SUBSIDE 
BELOW 20 KTS FOR MIDWEEK.

LHZ361-362-251515-
/O.EXB.KDTX.GL.W.0044.171225T1500Z-171226T0900Z/
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-
1003 PM EST SUN DEC 24 2017

...GALE WARNING IN EFFECT FROM 10 AM MONDAY TO 4 AM EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A GALE
WARNING WHICH IS IN EFFECT FROM 10 AM MONDAY TO 4 AM EST TUESDAY.

* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED 
  WINDS UP TO 29 KNOTS FROM THE NORTHWEST WITH GUSTS UP TO 39 
  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 8 PM EST MONDAY 
  WITH THE LARGEST WAVES EXPECTED AROUND 2 AM EST TUESDAY. 

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.

&&

$$

LHZ363-421-441>443-462>464-251515-
/O.CON.KDTX.GL.W.0044.171225T0600Z-171226T0900Z/
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-PORT AUSTIN TO HARBOR BEACH MI-
HARBOR BEACH TO PORT SANILAC MI-PORT SANILAC TO PORT HURON MI-
LAKE HURON FROM PORT AUSTIN TO HARBOR BEACH BEYOND 5NM OFF SHORE-
LAKE HURON FROM HARBOR BEACH TO PORT SANILAC BEYOND 5NM OFF SHORE-
LAKE HURON FROM PORT SANILAC TO PORT HURON BEYOND 5NM OFF SHORE-
1003 PM EST SUN DEC 24 2017

...GALE WARNING REMAINS IN EFFECT FROM 1 AM MONDAY TO 4 AM EST
TUESDAY...

* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED 
  WINDS UP TO 32 KNOTS FROM THE WEST WITH GUSTS UP TO 42 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 10 PM EST MONDAY 
  WITH THE LARGEST WAVES EXPECTED AROUND 1 AM EST TUESDAY. 

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.

&&

$$

AA

599 
WHUS73 KDTX 250854
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
354 AM EST MON DEC 25 2017

...GALES AND HEAVY FREEZING SPRAY THROUGH TONIGHT...

.WEST TO NORTHWEST GALE FORCE WINDS WILL DEVELOP OVER THE ENTIRE LAKE 
HURON BASIN TODAY IN RESPONSE TO ARCTIC COLD AIR BLASTING THROUGH 
THE REGION. GALE WARNINGS REMAIN IN EFFECT TODAY AND TONIGHT. HEAVY 
FREEZING SPRAY WARNINGS HAVE ALSO BEEN ISSUED FOR TODAY AND 
TONIGHT. SNOW SQUALLS WILL BE COMMON ACROSS THE WATERS AS COLDER AIR 
SPREADS INTO THE GREAT LAKES. BUILDING HIGH PRESSURE WILL ALLOW 
WINDS TO SUBSIDE BELOW 20 KTS FOR MIDWEEK.

LHZ363-421-441>443-462>464-252100-
/O.NEW.KDTX.UP.W.0002.171225T0854Z-171226T0900Z/
/O.CON.KDTX.GL.W.0044.000000T0000Z-171226T0900Z/
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-PORT AUSTIN TO HARBOR BEACH MI-
HARBOR BEACH TO PORT SANILAC MI-PORT SANILAC TO PORT HURON MI-
LAKE HURON FROM PORT AUSTIN TO HARBOR BEACH BEYOND 5NM OFF SHORE-
LAKE HURON FROM HARBOR BEACH TO PORT SANILAC BEYOND 5NM OFF SHORE-
LAKE HURON FROM PORT SANILAC TO PORT HURON BEYOND 5NM OFF SHORE-
354 AM EST MON DEC 25 2017

...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 4 AM EST
TUESDAY...
...GALE WARNING REMAINS IN EFFECT UNTIL 4 AM EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A
HEAVY FREEZING SPRAY WARNING WHICH IS IN EFFECT UNTIL 4 AM EST
TUESDAY. 

* EXPECT HEAVY FREEZING SPRAY TO OCCUR UNTIL 4 AM EST TUESDAY.

* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED 
  WINDS UP TO 32 KNOTS FROM THE WEST WITH GUSTS UP TO 43 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 EST MONDAY 
  WITH THE LARGEST WAVES EXPECTED AROUND 1 AM EST TUESDAY. 

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAVY FREEZING SPRAY WARNING MEANS HEAVY FREEZING SPRAY IS
EXPECTED TO RAPIDLY ACCUMULATE ON VESSELS. THESE CONDITIONS CAN
BE EXTREMELY HAZARDOUS TO NAVIGATION. IT IS RECOMMENDED THAT
MARINERS NOT TRAINED TO OPERATE IN THESE CONDITIONS OR VESSELS
NOT PROPERLY EQUIPED TO DO SO...REMAIN IN PORT OR AVOID THE
WARING AREA.

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.

&&

$$

LHZ361-362-252100-
/O.NEW.KDTX.UP.W.0002.171225T1500Z-171226T0900Z/
/O.CON.KDTX.GL.W.0044.171225T1500Z-171226T0900Z/
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-
354 AM EST MON DEC 25 2017

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 10 AM THIS MORNING
TO 4 AM EST TUESDAY...
...GALE WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 4 AM
EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A
HEAVY FREEZING SPRAY WARNING WHICH IS IN EFFECT FROM 10 AM THIS
MORNING TO 4 AM EST TUESDAY. 

* EXPECT HEAVY FREEZING SPRAY TO OCCUR FROM 10 AM THIS MORNING 
  TO 4 AM EST TUESDAY. 

* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED 
  WINDS UP TO 31 KNOTS FROM THE WEST WITH GUSTS UP TO 40 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 7 PM EST MONDAY 
  WITH THE LARGEST WAVES EXPECTED AROUND 2 AM EST TUESDAY. 

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAVY FREEZING SPRAY WARNING MEANS HEAVY FREEZING SPRAY IS
EXPECTED TO RAPIDLY ACCUMULATE ON VESSELS. THESE CONDITIONS CAN
BE EXTREMELY HAZARDOUS TO NAVIGATION. IT IS RECOMMENDED THAT
MARINERS NOT TRAINED TO OPERATE IN THESE CONDITIONS OR VESSELS
NOT PROPERLY EQUIPED TO DO SO...REMAIN IN PORT OR AVOID THE
WARING AREA.

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.

&&

$$

AA

397 
WHUS73 KDTX 251500
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1000 AM EST MON DEC 25 2017

...GALES AND HEAVY FREEZING SPRAY THROUGH TONIGHT...

.WEST TO NORTHWEST GALE FORCE WINDS WILL DEVELOP OVER THE ENTIRE LAKE 
HURON BASIN TODAY IN RESPONSE TO ARCTIC COLD AIR BLASTING THROUGH 
THE REGION. GALE WARNINGS REMAIN IN EFFECT TODAY AND TONIGHT. HEAVY 
FREEZING SPRAY WARNINGS HAVE ALSO BEEN ISSUED FOR TODAY AND 
TONIGHT. SNOW SQUALLS WILL BE COMMON ACROSS THE WATERS AS COLDER AIR 
SPREADS INTO THE GREAT LAKES. BUILDING HIGH PRESSURE WILL ALLOW 
WINDS TO SUBSIDE BELOW 20 KTS FOR MIDWEEK.

LHZ363-421-441>443-462>464-260900-
/O.CON.KDTX.GL.W.0044.000000T0000Z-171226T0900Z/
/O.CON.KDTX.UP.W.0002.000000T0000Z-171226T0900Z/
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-PORT AUSTIN TO HARBOR BEACH MI-
HARBOR BEACH TO PORT SANILAC MI-PORT SANILAC TO PORT HURON MI-
LAKE HURON FROM PORT AUSTIN TO HARBOR BEACH BEYOND 5NM OFF SHORE-
LAKE HURON FROM HARBOR BEACH TO PORT SANILAC BEYOND 5NM OFF SHORE-
LAKE HURON FROM PORT SANILAC TO PORT HURON BEYOND 5NM OFF SHORE-
1000 AM EST MON DEC 25 2017

...GALE WARNING REMAINS IN EFFECT UNTIL 4 AM EST TUESDAY...
...HEAVY FREEZING SPRAY WARNING REMAINS IN EFFECT UNTIL 4 AM EST
TUESDAY...

* EXPECT HEAVY FREEZING SPRAY TO OCCUR UNTIL 4 AM EST TUESDAY.

* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED 
  WINDS UP TO 32 KNOTS FROM THE WEST WITH GUSTS UP TO 43 KNOTS. 
  THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 10 FEET WITH A 
  POTENTIAL MAXIMUM WAVE HEIGHT OF 14 FEET. 

* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 7 PM EST MONDAY 
  WITH THE LARGEST WAVES EXPECTED AROUND 9 PM EST MONDAY. 

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAVY FREEZING SPRAY WARNING MEANS HEAVY FREEZING SPRAY IS
EXPECTED TO RAPIDLY ACCUMULATE ON VESSELS. THESE CONDITIONS CAN
BE EXTREMELY HAZARDOUS TO NAVIGATION. IT IS RECOMMENDED THAT
MARINERS NOT TRAINED TO OPERATE IN THESE CONDITIONS OR VESSELS
NOT PROPERLY EQUIPPED TO DO SO...REMAIN IN PORT OR AVOID THE
WARING AREA.

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.

&&

$$

LHZ361-362-260900-
/O.CON.KDTX.GL.W.0044.000000T0000Z-171226T0900Z/
/O.CON.KDTX.UP.W.0002.000000T0000Z-171226T0900Z/
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-
1000 AM EST MON DEC 25 2017

...GALE WARNING REMAINS IN EFFECT UNTIL 4 AM EST TUESDAY...
...HEAVY FREEZING SPRAY WARNING REMAINS IN EFFECT UNTIL 4 AM EST
TUESDAY...

* EXPECT HEAVY FREEZING SPRAY TO OCCUR UNTIL 4 AM EST TUESDAY.

* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED 
  WINDS UP TO 34 KNOTS FROM THE NORTHWEST WITH GUSTS UP TO 42 
  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 10 AM EST MONDAY 
  WITH THE LARGEST WAVES EXPECTED AROUND 7 PM EST MONDAY. 

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAVY FREEZING SPRAY WARNING MEANS HEAVY FREEZING SPRAY IS
EXPECTED TO RAPIDLY ACCUMULATE ON VESSELS. THESE CONDITIONS CAN
BE EXTREMELY HAZARDOUS TO NAVIGATION. IT IS RECOMMENDED THAT
MARINERS NOT TRAINED TO OPERATE IN THESE CONDITIONS OR VESSELS
NOT PROPERLY EQUIPPED TO DO SO...REMAIN IN PORT OR AVOID THE
WARING AREA.

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.

&&

$$

LEZ444-260900-
/O.NEW.KDTX.LO.Y.0007.171225T1500Z-171226T0900Z/
MICHIGAN WATERS OF LAKE ERIE FROM DETROIT RIVER TO NORTH CAPE MI-
1000 AM EST MON DEC 25 2017

...LOW WATER ADVISORY IN EFFECT UNTIL 4 AM EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A LOW
WATER ADVISORY WHICH IS IN EFFECT UNTIL 4 AM EST TUESDAY. 

* THE WATER LEVEL AT TOLEDO HAS FALLEN BELOW THE CRITICAL MARK FOR
  SAFE NAVIGATION. AT 10 AM THE WATER LEVEL WAS 8 INCHES BELOW 
  THE CRITICAL MARK OR 32 INCHES BELOW RECENT AVERAGE LEVELS. 
  WATER LEVELS ARE EXPECTED TO FLUCTUATE AROUND THE CRITICAL MARK 
  INTO THIS EVENING BEFORE RISING OVERNIGHT. 

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A LOW WATER ADVISORY MEANS WATER LEVELS ARE EXPECTED TO BE
SIGNIFICANTLY BELOW AVERAGE. MARINERS SHOULD USE EXTREME CAUTION
AND TRANSIT AT THE SLOWEST SAFE NAVIGABLE SPEED TO MINIMIZE
IMPACT.

&&

$$

IRL

089 
WHUS73 KDTX 252034
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
334 PM EST MON DEC 25 2017

...GALES AND FREEZING SPRAY CONTINUE INTO TONIGHT...

.WEST TO NORTHWEST GALES WILL CONTINUE ACROSS MOST OF THE LAKE HURON 
BASIN THROUGH TONIGHT, ALONG WITH HEAVY FREEZING SPRAY AND SNOW 
SQUALLS AS MUCH COLDER AIR FILTERS IN BEHIND AN ARCTIC FRONTAL 
PASSAGE. STRONG HIGH PRESSURE SLOWLY BUILDING EASTWARD FROM THE 
NORTHERN PLAINS WILL ALLOW WINDS TO SLACKEN BEGINNING TUESDAY 
MORNING. FREEZING SPRAY WILL CONTINUE TO BE POSSIBLE DURING THE DAY 
ON TUESDAY. THE BUILDING HIGH PRESSURE WILL ALLOW WINDS OVER THE 
LOCAL WATERS TO REMAIN BELOW 20 KNOTS THROUGH MIDWEEK.

LHZ363-421-441>443-462>464-260900-
/O.CON.KDTX.GL.W.0044.000000T0000Z-171226T0900Z/
/O.CON.KDTX.UP.W.0002.000000T0000Z-171226T0900Z/
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-PORT AUSTIN TO HARBOR BEACH MI-
HARBOR BEACH TO PORT SANILAC MI-PORT SANILAC TO PORT HURON MI-
LAKE HURON FROM PORT AUSTIN TO HARBOR BEACH BEYOND 5NM OFF SHORE-
LAKE HURON FROM HARBOR BEACH TO PORT SANILAC BEYOND 5NM OFF SHORE-
LAKE HURON FROM PORT SANILAC TO PORT HURON BEYOND 5NM OFF SHORE-
334 PM EST MON DEC 25 2017

...GALE WARNING REMAINS IN EFFECT UNTIL 4 AM EST TUESDAY...
...HEAVY FREEZING SPRAY WARNING REMAINS IN EFFECT UNTIL 4 AM EST
TUESDAY...

* EXPECT HEAVY FREEZING SPRAY TO OCCUR UNTIL 4 AM EST TUESDAY.

* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED 
  WINDS UP TO 32 KNOTS FROM THE WEST WITH GUSTS UP TO 43 KNOTS. 
  THE LARGEST EXPECTED SIGNIFICANT WAVES WILL BE 10 FEET WITH A 
  POTENTIAL MAXIMUM WAVE HEIGHT OF 14 FEET. 

* TIMING: THE MAXIMUM WINDS ARE EXPECTED AROUND 7 PM EST MONDAY 
  WITH THE LARGEST WAVES EXPECTED AROUND 9 PM EST MONDAY. 

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAVY FREEZING SPRAY WARNING MEANS HEAVY FREEZING SPRAY IS
EXPECTED TO RAPIDLY ACCUMULATE ON VESSELS. THESE CONDITIONS CAN
BE EXTREMELY HAZARDOUS TO NAVIGATION. IT IS RECOMMENDED THAT
MARINERS NOT TRAINED TO OPERATE IN THESE CONDITIONS OR VESSELS
NOT PROPERLY EQUIPPED TO DO SO...REMAIN IN PORT OR AVOID THE
WARING AREA.

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.

&&

$$

LHZ361-362-260900-
/O.CON.KDTX.GL.W.0044.000000T0000Z-171226T0900Z/
/O.CON.KDTX.UP.W.0002.000000T0000Z-171226T0900Z/
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-
334 PM EST MON DEC 25 2017

...GALE WARNING REMAINS IN EFFECT UNTIL 4 AM EST TUESDAY...
...HEAVY FREEZING SPRAY WARNING REMAINS IN EFFECT UNTIL 4 AM EST
TUESDAY...

* EXPECT HEAVY FREEZING SPRAY TO OCCUR UNTIL 4 AM EST TUESDAY.

* WIND AND WAVES: DURING THE GALE WARNING...EXPECT SUSTAINED 
  WINDS UP TO 31 KNOTS FROM THE WEST WITH GUSTS UP TO 40 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 6 PM EST MONDAY 
  WITH THE LARGEST WAVES EXPECTED AROUND 8 PM EST MONDAY. 

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAVY FREEZING SPRAY WARNING MEANS HEAVY FREEZING SPRAY IS
EXPECTED TO RAPIDLY ACCUMULATE ON VESSELS. THESE CONDITIONS CAN
BE EXTREMELY HAZARDOUS TO NAVIGATION. IT IS RECOMMENDED THAT
MARINERS NOT TRAINED TO OPERATE IN THESE CONDITIONS OR VESSELS
NOT PROPERLY EQUIPPED TO DO SO...REMAIN IN PORT OR AVOID THE
WARING AREA.

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.

&&

$$

LEZ444-260900-
/O.CON.KDTX.LO.Y.0007.000000T0000Z-171226T0900Z/
MICHIGAN WATERS OF LAKE ERIE FROM DETROIT RIVER TO NORTH CAPE MI-
334 PM EST MON DEC 25 2017

...LOW WATER ADVISORY REMAINS IN EFFECT UNTIL 4 AM EST TUESDAY...

* THE WATER LEVEL AT TOLEDO HAS FALLEN BELOW THE CRITICAL MARK FOR
  SAFE NAVIGATION. AT 10 AM THE WATER LEVEL WAS 8 INCHES BELOW THE
  CRITICAL MARK OR 32 INCHES BELOW RECENT AVERAGE LEVELS. WATER
  LEVELS ARE EXPECTED TO FLUCTUATE AROUND THE CRITICAL MARK INTO
  THIS EVENING BEFORE RISING LATE OVERNIGHT. 

REFER TO THE LATEST MARINE FORECASTS FOR GREATER DETAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A LOW WATER ADVISORY MEANS WATER LEVELS ARE EXPECTED TO BE
SIGNIFICANTLY BELOW AVERAGE. MARINERS SHOULD USE EXTREME CAUTION
AND TRANSIT AT THE SLOWEST SAFE NAVIGABLE SPEED TO MINIMIZE
IMPACT.

&&

$$

IRL

934 
WHUS73 KDTX 260910
MWWDTX

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
410 AM EST TUE DEC 26 2017


LHZ361>363-421-441>443-462>464-261015-
/O.EXP.KDTX.GL.W.0044.000000T0000Z-171226T0900Z/
/O.EXP.KDTX.UP.W.0002.000000T0000Z-171226T0900Z/
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-
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-
LAKE HURON FROM PORT AUSTIN TO HARBOR BEACH BEYOND 5NM OFF SHORE-
LAKE HURON FROM HARBOR BEACH TO PORT SANILAC BEYOND 5NM OFF SHORE-
LAKE HURON FROM PORT SANILAC TO PORT HURON BEYOND 5NM OFF SHORE-
410 AM EST TUE DEC 26 2017

...GALE WARNING HAS EXPIRED...
...HEAVY FREEZING SPRAY WARNING HAS EXPIRED...

THE GALE WARNING IS NO LONGER IN EFFECT. THE HEAVY FREEZING SPRAY
WARNING IS NO LONGER IN EFFECT. 

$$

LEZ444-261015-
/O.EXP.KDTX.LO.Y.0007.000000T0000Z-171226T0900Z/
MICHIGAN WATERS OF LAKE ERIE FROM DETROIT RIVER TO NORTH CAPE MI-
410 AM EST TUE DEC 26 2017

...LOW WATER ADVISORY HAS EXPIRED...

THE LOW WATER ADVISORY IS NO LONGER IN EFFECT. 

$$

CB

Area Forecast Discussion
National Weather Service Detroit/Pontiac MI
1150 PM EST Sat Dec 23 2017

.AVIATION...

Recent satellite data is showing breaks in the stratus across
central Michigan. Suface high pressure nudging in from the west and
dry air advection will lead to a steady decrease in these low clouds
during the course of the early (pre dawn) hours. Light snow is then
expected to advance across the region between 18Z and 20Z this
afternoon. The snow will persist through late evening with 1 to 4
inches total accumulation, highest amounts near Detroit.

For DTW...Light snow will advance into metro between 18Z and 19Z,
with the peak intensity expected in the 23Z to 03Z time frame.
Upwards of 3 to 4 inches of total accumulation is expected.

//DTW THRESHOLD PROBABILITIES...

* Moderate in ceilings below 5000 ft this morning. High Sunday
  afternoon and evening.

* High in precip type being all snow Sunday afternoon/evening.

&&

.PREV DISCUSSION...
Issued at 932 PM EST Sat Dec 23 2017

UPDATE...

Early indications suggest the current forecast for the Christmas Eve
snow looks reasonable. Since the mid level wave will still be exiting
the lee of the Colorado Rockies tonight and given the snow is not
likely to start until after 2 PM Sunday, feel it would be best to
await the full 00Z model suite to fully address any forecast
adjustments/headline decisions. So no forecast changes/headline
issuances will be made until the early AM forecast package.

As far as tonight, the 00Z DTX sounding revealed a deep low level
inversion, which a shallow stratus deck remains trapped beneath.
The clouds have actually expanded to encompass most of the forecast
area this evening. Ongoing low level dry air advection and
increasingly low level anticyclonic flow during the night should
still lead to an erosion of these lower clouds. High level clouds are
however rapidly expanding across srn Mi. An evening forecast update
will be issued to nudge the cloud cover up and raise overnight min
temps a couple degrees accordingly.

PREV DISCUSSION...
Issued at 245 PM EST Sat Dec 23 2017

DISCUSSION...

No substantive change to forecast reasoning with regard to Christmas
eve clipper from yesterday's forecast package. The NCEP suite still
continues to struggle with digging high latitude jet energy,
initialization of the leading shortwave over Washington this
morning, and especially the downstream pattern over the Great Lakes.
Trends among the NCEP guidance continue to be toward an EC/UKMET
consensus, which themselves have shown a slight southeastward
correction. Ensemble sensitivity analysis shows once again that it
is upstream Pacific energy impinging on the developing high latitude
west coast ridge that is responsible for the recent NWP jumpiness,
particularly in the downstream effects on the meridionally oriented
jet digging south over Canada. SREF(mean)/EC/NAM consensus on a
swath of QPF approaching 0.3" QPF is realistic. Low quality moisture
characterized by specific humidity of 1.5 g/kg or less above 850mb,
the level above which most of the isentropic ascent will be found
over Lower MI, should provide an effective cap on overall potential.

Thermodynamics will be favorable, but not particularly impressive.
Deep lift through the depth of the troposphere will include an
approx 850-700mb dgz as well as saturation extending through sub -
30C layers aloft. Expect mixed crystal type, including dendrites,
and minimal riming given surface temps -5C/23F or lower in most
locations outside the far SE. Environment certainly not comparable
to the previous clipper. In-house guidance of event average snow
ratios around 13 to 14:1 seems perfectly reasonable. One note here
is that the DGZ is nearly co-located with the frontal surface in the
NAM12 - below most vertical motion. Any more northward solution,
however, may place more of SE favorably lower on the frontal slope
and open the door for improved ratios. Finally, moderate to high
static stability above the frontal slope lends favor to those
solutions with a wider snow swath and a less intense fgen band. The
NCEP models and CMC have indeed all moved toward the EC/UK in this
regard. Expectation is for a general 1 to 4 inches. 1-2" in the
Saginaw Valley increasing to 2 to 4 along and especially east of the
glacial ridge - potentially slightly higher for the far east zones
if surface temps can be held in check/below the mid 20s. 4"/9hr
advisory criteria is in play for some zones. However, given model
sensitivity displayed in recent cycles, prefer to allow eve shift to
at least peruse 00z NAM guidance before making a decision.

Initial wave of cold advection behind Sunday's clipper will cause
850mb temps to dip toward -15C during the day Monday. Dewpoints
still hovering between 10 and 15F and 0-1km theta-e lapse rates over
Lake Michigan between 5 and 7C/km within a backing WNW to WSW
boundary layer flow field is suggestive of an active lake effect
response with sufficient fetch and ample supersaturation wrt ice to
maintain LES bands across the lower peninsula. Christmas Day is
thusly appearing increasingly likely to be characterized by highs
near 20, wind chills in the single digits, and infiltration of LES
from the west. Next wave of cold advection will send 850mb temps
into the -20s by late Monday night as the cold polar low is forced
into Ontario. LES will likely retract back to the west side of the
state as this occurs on account of dry advection squashing the
convective response. Given the 850/925mb temperature proxies,
surface temps should have no problem falling into the single digits
Monday night. Ongoing CAA will ensure a steady gradient wind and the
persistence of a mixed boundary layer through the night. Wind chills
likely ranging between 0 to -15F by predawn Tuesday.

Main issue going into the extended forecast to round out the week
will be the continued below normal temperatures.  Troughing will
remain in place over the Great Lakes area which will allow for cold
arctic air to filter in.  High temperatures during this time will
only make it into the teens, with lows overnight in the single
digits.  Wind chill values during this time will reside in the 0 to
-10F. Currently, Tuesday through the day on Thursday looks to stay
dry before a chance for some more snow showers comes back into the
forecast late Thursday into Friday.

MARINE...

Northwest winds of 10 to 15 knots with gusts closer to 20 knots
will will decrease into Sunday as high pressure moves through the
region. Winds increase again in the wake of a passing low pressure
system Sunday evening with gales and heavy freezing spray quite
possible by Monday and especially into Monday evening as a renewed
surge of Arctic air pushes through the area. A Gale Watch has been
issued for these potential conditions.

&&

.DTX WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
Lake Huron...Gale Watch from late Sunday night through late Monday night for
     LHZ363-462-463.

     Gale Watch from Monday afternoon through late Monday night for
     LHZ421-441>443-464.

Lake St Clair...NONE.
Michigan waters of Lake Erie...NONE.
&&

AVIATION.....SC
UPDATE.......SC
DISCUSSION...JVC/SP
MARINE.......DG

You can obtain your latest National Weather Service forecasts online
at www.weather.gov/detroit.

Hazardous Weather Outlook
National Weather Service Detroit/Pontiac MI
349 PM EST Sat Dec 23 2017

MIZ047>049-053>055-060>062-242100-
Midland-Bay-Huron-Saginaw-Tuscola-Sanilac-Shiawassee-Genesee-Lapeer-
349 PM EST Sat Dec 23 2017

This hazardous weather outlook is for portions of southeast
Michigan.

.DAY ONE...This Afternoon and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Minor snow accumulations of 1 to 3 inches are possible Sunday evening
into Sunday night. The highest amounts will be nearest the I-69
corridor.

Subzero wind chills are possible Monday evening through Thursday
morning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-242100-
Lake St Clair-
Michigan Waters of Lake Erie from Detroit River to North Cape MI-
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-
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-Harbor Beach to Port Sanilac MI-
Port Sanilac to Port Huron MI-
Lake Huron from Port Austin to Harbor Beach beyond 5NM Off Shore-
Lake Huron from Harbor Beach to Port Sanilac beyond 5NM Off Shore-
Lake Huron from Port Sanilac to Port Huron beyond 5NM Off Shore-
349 PM EST Sat Dec 23 2017

This hazardous weather outlook is for portions of Lake Erie, Lake
Huron and Lake St Clair.

.DAY ONE...This Afternoon and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Gale watches are in effect. See the forecast for detail.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

MIZ063-068>070-075-076-082-083-242100-
St. Clair-Livingston-Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe-
349 PM EST Sat Dec 23 2017

This hazardous weather outlook is for portions of southeast
Michigan.

.DAY ONE...This Afternoon and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Snow accumulations of 3 to 5 inches are possible Sunday afternoon
into Sunday night. The highest amounts are forecast be nearest the
Canadian border along a line from Port Huron to Detroit to Monroe. A
winter weather advisory may be needed for some locations.

Subzero wind chills are possible Monday evening through Thursday
morning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

You can obtain your latest National Weather Service forecasts online
at www.weather.gov/detroit.