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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Last Update: 851 AM CST SAT DEC 20 2014

View Nearby Observations

Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.

Marine Zone Forecast

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.

  • SynopsisA 30.4 INCH HIGH PRESSURE INCHES STRETCHES FROM QUEBEC THROUGH THE LOWER MISSISSIPPI VALLEY. THIS RIDGE WILL SLOWLY SLIDE EAST OF LAKE MICHIGAN THROUGH THIS AFTERNOON. THE HIGH WILL REMAIN ACROSS EASTERN NORTH AMERICA SUNDAY...WHILE AN AREA OF LOW PRESSURE OF 29.4 INCHES MOVES SOUTHEAST ALONG THE LEE OF THE NORTHERN ROCKIES. THIS LOW WILL TRACK ACROSS THE NORTHERN PLAINS SUNDAY NIGHT AND THEN SLOWLY MOVE INTO THE UPPER MISSISSIPPI VALLEY MONDAY BEFORE FILLING TO NEAR 29.6 INCHES ON TUESDAY. WHILE THIS LOW FILLS...ANOTHER LOW WILL DEVELOP ACROSS THE LOWER OHIO OR TENNESSEE VALLEYS LATE TUESDAY...AND IS EXPECTED TO DEEPEN RAPIDLY TO NEAR 28.8 INCHES AS IT MOVES NORTH INTO THE GREAT LAKES REGION WEDNESDAY. THIS DEEPENING LOW TRACK WOULD LIKELY PRODUCE GALES ON LAKE MICHIGAN LATE WEDNESDAY INTO THURSDAY.
  • Rest Of Today Southwest winds 5 to 10 kt becoming south in the afternoon. Waves 1 ft or less.
  • Tonight South winds 5 to 10 kt increasing to 10 to 20 kt late. Waves 1 to 3 ft.
  • Sunday South winds 15 to 25 kt. Slight chance of light freezing drizzle in the morning. Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft in the afternoon.
  • Sunday Night South winds to 30 kt. Slight chance of snow. Waves 5 to 8 ft occasionally to 10 ft.
  • Monday South winds to 30 kt becoming southeast. Slight chance of rain in the morning...then chance of rain in the afternoon. Waves 5 to 8 ft occasionally to 10 ft.
  • Monday Night Southeast winds to 30 kt diminishing to 15 to 20 kt and becoming south. Rain likely. Waves 5 to 8 ft occasionally to 10 ft.
  • Tuesday South winds 10 to 20 kt. Chance of rain. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft occasionally to 7 ft in the afternoon.
  • Wednesday Northwest winds 15 to 25 kt increasing to gales to 35 kt in the afternoon. Snow and rain likely. Waves 3 to 5 ft occasionally to 7 ft building to 5 to 8 ft occasionally to 10 ft in the afternoon.



Additional Forecasts and Information

Zone Area Forecast for Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.
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