NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
2:41 PM Thursday December 18
W2 WAVES ARE PROVIDED AS A RANGE OF SIGNIFICANT WAVE HEIGHTS, WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES, ALONG WITH THE AVERAGE HEIGHT OF THE HIGHEST 10 PERCENT OF THE WAVES WHICH WILL OCCASIONALLY BE ENCOUNTERED.W2 SYNOPSIS, BROAD HIGH PRESSURE OF 304 INCHES EXTENDING FROM ONTARIO TO THE CENTRAL GULF COAST WILL SLOWLY MOVE EAST AND EXTEND FROM QUEBEC THROUGH THE LOWER MISSISSIPPI VALLEY BY SATURDAY.W2 THE HIGH PRESSURE WILL CONTINUE TO VERY SLOW SPREAD TO THE EAST AS A WEAK TROUGH OF LOW PRESSURE AVERAGING 301 INCHES DEVELOPS OVER THE NORTHERN PLAINS.W2 THIS INITIAL TROUGH WILL MOVE LITTLE THROUGH SATURDAY AND THEN A LOW PRESSURE SYSTEM IS EXPECTED TO DROP OUT OF THE SOUTHERN CANADIAN ROCKIES BY SUNDAY EVENING, HELPING TO DEEPEN THE SYSTEM TO 295 INCHES.W2 THIS LOW IS THEN EXPECTED TO TRACK EAST TO WISCONSIN EARLY NEXT WEEK WHILE DEEPENING FURTHER TO 293 INCHES.W2 LMZ261-362-364-366-563-565-567-868-190445.W2 LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NAUTICAL MILES OFFSHORE TO MID LAKE.W2 LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH FOX ISLAND 5 NAUTICAL MILES OFFSHORE.W2 LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NAUTICAL MILES OFFSHORE TO MID LAKE.W2 LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NAUTICAL MILES OFFSHORE TO MID LAKE.W2 LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI.W2 LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NAUTICAL MILES OFFSHORE TO MID LAKE.W2 LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NAUTICAL MILES OFFSHORE TO MID LAKE.W2 LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NAUTICAL MILES OFFSHORE TO MID LAKE.W2 sheboygan wi to pentwater mi north tonight, north winds 10 to 15 knots.W2 waves 2 to 4 feet.W2 friday, north winds 5 to 10 knots becoming northwest.W2 waves 1 to 3 feet.W2 friday night, light and variable winds.W2 waves around 1 feet.W2 saturday, south winds 5 to 10 knots.W2 waves 1 to 2 feet.W2 saturday night, south winds 10 to 15 knots.W2 waves 1 to 2 feet.W2 sunday, south winds 10 to 15 knots increasing to 15 to 25 knots in the afternoon.W2 slight chance of snow showers.W2 waves 1 to 3 feet building to 2 to 4 feet in the afternoon.W2 sunday night, south winds 15 to 25 knots.W2 chance of rain.W2 waves 4 to 6 feet occasionally to 8 feet.W2 monday, southeast winds 15 to 25 knots.W2 chance of rain or snow.W2 waves 4 to 6 feet occasionally to 8 feet.W2 tuesday, south winds 15 to 25 knots.W2 rain or snow showers likely.W2 waves 4 to 6 feet occasionally to 8 feet.W2