National Weather Service United States Department of Commerce

Heavy rain and mountain snow across the northwestern U.S. on Saturday

Another Pacific system will impact the West Coast today. Heavy rainfall could lead to flash flooding, river and small stream flooding as well as mudslides and debris flows, especially over burn scars. Strong winds and heavy elevation snowfall, with accumulations of 1 to 3 feet, could result in hazardous travel through mountain passes.
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Hazardous Weather Conditions

Last Update: 343 AM CST SAT DEC 20 2014

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Lake Pontchartrain and Lake Maurepas

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.


  • SynopsisA BROAD AREA OF LOW PRESSURE OVER THE NORTH-CENTRAL GULF OF MEXICO WILL CONTINUE TO MOVE EAST TODAY. HIGH PRESSURE WILL BUILD INTO THE NORTH GULF THROUGH SUNDAY. A STRONG COLD FRONT WILL BE APPROACHING THE NORTHWEST GULF MONDAY AND BRING AN INCREASE IN ONSHORE FLOW LATE MONDAY INTO TUESDAY. COLD FRONT BRINGS A WIND SHIFT AND COLD AIR INTO THE NORTH GULF LATE TUESDAY. GALE CONDITIONS MAY DEVELOP FOR A PERIOD OF TIME TUESDAY NIGHT INTO EARLY WEDNESDAY OVER PORTIONS OF THE COASTAL WATERS.
  • Today Northeast winds 10 to 15 knots. Waves 2 to 4 feet dominant period 2 seconds. Slight chance of showers early in the morning.
  • Tonight Northeast winds 10 to 15 knots. Waves 1 to 2 feet dominant period 2 seconds. Slight chance of showers after midnight.
  • Sunday East winds 5 to 10 knots. Waves 1 to 2 feet dominant period 2 seconds. Chance of showers.
  • Sunday Night East winds 5 to 10 knots becoming northeast after midnight. Waves 1 foot or less dominant period 2 seconds. Slight chance of showers in the evening.
  • Monday Northwest winds near 5 knots becoming southwest in the late morning and afternoon. Waves less than 1 foot dominant period 1 second building to 1 to 2 feet dominant period 1 second in the afternoon.
  • Monday Night South winds near 10 knots. Waves 1 to 3 feet dominant period 1 second. Chance of showers through the night. Chance of thunderstorms after midnight.
  • Tuesday Southwest winds 15 to 20 knots. Waves 3 to 5 feet. Chance of showers and thunderstorms.
  • Tuesday Night Northwest winds 15 to 20 knots. Waves 3 to 5 feet. Chance of thunderstorms in the evening. Chance of showers through the night.
  • Wednesday West winds 15 to 20 knots. Waves 3 to 5 feet.
  • Wednesday Night West winds 10 to 15 knots. Waves 2 to 4 feet.



Additional Forecasts and Information

Zone Area Forecast for Lake Pontchartrain and Lake Maurepas
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