National Weather Service United States Department of Commerce

Heavy lake-effect snow continues across lower Great Lakes

Another round of heavy lake-effect snow is forecast for the Great Lakes through mid-day Friday. An additional 30 inches or more could fall in some locations, on top of the impressive amounts that have fallen already. This will result in very difficult or nearly impossible travel at times in the heaviest snow bands. The snow should taper off during the morning on Friday.
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Last Update: 331 PM CST THU NOV 20 2014

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Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya River Louisiana out 20 NM

Marine Zone Forecast

SEAS ARE PROVIDED AS A RANGE OF THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES...ALONG WITH THE OCCASIONAL HEIGHT OF THE AVERAGE HIGHEST TEN PERCENT OF THE WAVES.


  • SynopsisHIGH PRESSURE OVER THE GULF STATES WILL CONTINUE TO PUSH EASTWARD THROUGH THE REST OF THE WORK WEEK. A VIGOROUS STORM SYSTEM WILL SWEEP ACROSS THE LOWER MISSISSIPPI VALLEY WITH A DEEPENING SURFACE LOW MOVING THROUGH THE RED RIVER VALLEY AND INTO THE OZARKS THIS WEEKEND.
  • Tonight East winds 10 to 15 knots. Seas 2 to 4 feet dominant period 4 seconds.
  • Friday East winds 15 to 20 knots. Seas 3 to 5 feet dominant period 3 seconds.
  • Friday Night East winds 15 to 20 knots. Seas 3 to 6 feet with occasional seas to 8 feet.
  • Saturday East winds 15 to 20 knots. Seas 4 to 7 feet with occasional seas to 8 feet building to 5 to 8 feet with occasional seas to 10 feet in the afternoon. Chance of thunderstorms in the morning. Showers likely through the day. Thunderstorms likely in the afternoon.
  • Saturday Night Southeast winds 15 to 20 knots becoming south after midnight. Seas 6 to 10 feet with occasional seas to 11 feet. Showers and thunderstorms.
  • Sunday Southwest winds 20 to 25 knots. Seas 6 to 10 feet with occasional seas to 11 feet dominant period 8 seconds. Chance of thunderstorms in the morning. Chance of showers through the day.
  • Sunday Night Southwest winds 15 to 20 knots. Seas 4 to 7 feet with occasional seas to 9 feet dominant period 7 seconds. Slight chance of showers.
  • Monday Northwest winds 5 to 10 knots. Seas 3 to 6 feet with occasional seas to 8 feet.
  • Monday Night North winds 10 to 15 knots. Seas 3 to 5 feet.
  • Tuesday Northwest winds 10 to 15 knots. Seas 2 to 4 feet.
  • Tuesday Night North winds 10 to 15 knots. Seas 2 to 4 feet.



Additional Forecasts and Information

Zone Area Forecast for Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya River Louisiana out 20 NM
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