Great Lakes Forecast
Issued by NWS
Issued by NWS
917 FZUS63 KMQT 031954 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 354 PM EDT Fri May 3 2024 For waters beyond 5 nautical miles of shore on Lake Superior. Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS... A 29.7 inch low pressure currently spinning over northwest Ontario drags a 29.8 inch trough across Lake Superior the rest of today into tonight before lifting northeast. Ridging builds to 30.1 inches across eastern Lake Superior by Saturday morning. A weak 29.9 inch trough moves into the Upper Great Lakes Saturday evening before ridging at 30.1 inches returns by Sunday. Ridging shifts east early next week as a broad 29.2 inch low pressure develops on the Northern Plains on Monday. A strong pressure gradient over western Lake Superior begins to setup Tuesday morning as a deepening 29.0 inch low pushes eastward against 30.0 inch ridging over far northern Ontario. A secondary 29.4 inch low pressure moves into southern Lake Superior Wednesday morning. LSZ162-040400- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 354 PM EDT Fri May 3 2024 /254 PM CDT Fri May 3 2024/ .LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 3 to 5 feet occasionally to 7 feet. .TONIGHT...West winds 15 to 25 knots diminishing to 5 to 15 knots after midnight, then backing southwest late. A chance of rain showers. Waves subsiding to calm to 2 feet. .SATURDAY...North winds 5 to 15 knots veering northeast in the afternoon, then backing north late. A chance of rain showers. Waves calm to 2 feet. .SATURDAY NIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots late. A slight chance of rain showers through midnight. Waves calm to 2 feet. .SUNDAY...West winds 10 to 20 knots backing southwest by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...South winds 5 to 15 knots backing northeast after midnight. Waves calm to 2 feet. .MONDAY...East winds 10 to 20 knots becoming northeast 20 to 30 knots by mid afternoon. Waves building to 4 to 7 feet occasionally to 9 feet. .MONDAY NIGHT...East winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. A chance of rain showers after midnight. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...East winds 20 to 30 knots becoming northeast 15 to 25 knots. Rain showers. A chance of thunderstorms. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain showers. Waves subsiding to 1 to 3 feet. $$ LSZ263-040400- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 354 PM EDT Fri May 3 2024 .LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet. .TONIGHT...West winds 15 to 25 knots becoming southwest 10 to 20 knots after midnight, then diminishing to 5 to 15 knots late. A chance of rain showers. Waves subsiding to 1 to 3 feet. .SATURDAY...North winds 5 to 15 knots veering northeast in the afternoon. A chance of rain showers. Waves subsiding to calm to 2 feet. .SATURDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. A slight chance of rain showers through midnight. Waves calm to 2 feet. .SUNDAY...West winds 5 to 15 knots becoming southwest 10 to 20 knots by mid afternoon. Waves building to 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots backing southeast after midnight. Waves subsiding to calm to 2 feet. .MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves building to 1 to 3 feet. .MONDAY NIGHT...East winds 10 to 20 knots. A chance of rain showers after midnight. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots. Rain showers and a chance of thunderstorms. Waves building to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain showers. Waves subsiding to 1 to 3 feet. $$ LSZ264-040400- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 354 PM EDT Fri May 3 2024 .LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 2 to 4 feet. .TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to 15 knots late. A chance of rain showers. Waves subsiding to 1 to 3 feet. .SATURDAY...Southwest winds less than 10 knots becoming east 5 to 15 knots in the afternoon, then backing northeast late. A chance of rain showers. Waves subsiding to calm to 2 feet. .SATURDAY NIGHT...Northwest winds 5 to 15 knots. A chance of rain showers. Waves building to 1 to 3 feet. .SUNDAY...West winds 5 to 15 knots. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southeast after midnight. Waves building to 2 to 4 feet. .TUESDAY...East winds 15 to 25 knots. Rain showers likely. Waves building to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain showers. Waves subsiding to 1 to 3 feet. $$ LSZ265-040400- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 354 PM EDT Fri May 3 2024 .LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots backing south late. Sprinkles after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots in the afternoon. A chance of rain showers by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west after midnight. A chance of rain showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SUNDAY...West winds 10 to 20 knots becoming northwest 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots becoming southeast 15 to 25 knots after midnight. Waves building to 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots. Showers likely. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain showers. Waves subsiding to 1 to 3 feet. $$ LSZ266-040400- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- 354 PM EDT Fri May 3 2024 .LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves 1 to 3 feet. .TONIGHT...South winds 10 to 20 knots diminishing to 5 to 15 knots late. Waves 1 to 3 feet. .SATURDAY...South winds 5 to 15 knots becoming east 10 to 20 knots in the afternoon. A chance of rain showers by mid afternoon. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .SATURDAY NIGHT...Northwest winds 10 to 20 knots increasing to 15 to 25 knots after midnight, then diminishing to 10 to 20 knots late. A chance of rain showers. Waves building to 2 to 4 feet. .SUNDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots by mid afternoon. Waves subsiding to 1 to 3 feet. .SUNDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southeast after midnight. Waves building to 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots. Showers likely. Waves building to 3 to 5 feet occasionally to 7 feet. .WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain showers. Waves subsiding to 1 to 3 feet. $$ LSZ267-040400- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 354 PM EDT Fri May 3 2024 .LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...South winds 10 to 20 knots. Waves calm to 2 feet. .SATURDAY...Southeast winds 10 to 20 knots. A slight chance of rain showers by mid afternoon. Waves building to 1 to 3 feet. .SATURDAY NIGHT...Southeast winds 10 to 20 knots veering west after midnight, then becoming northwest 15 to 25 knots late. A chance of rain showers. Waves subsiding to calm to 2 feet, then building to 2 to 4 feet. .SUNDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots by mid afternoon. Waves subsiding to 1 to 3 feet. .SUNDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves subsiding to calm to 2 feet. .MONDAY...Southeast winds 10 to 20 knots backing east by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 10 to 20 knots veering southeast after midnight. Waves calm to 2 feet. .TUESDAY...Southeast winds 15 to 25 knots backing east. Showers likely. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to 20 knots. A chance of rain showers. Waves subsiding to calm to 2 feet. $$ LSZ261-040400- MAFOR 0321/ Superior West 11540 11630 11620 11510 11500 11700 12110. A chance of rain showers. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight and Saturday. Superior North Central 14520 11510 11500 11200 11210. Waves 2 to 4 feet tonight. Waves 1 to 3 feet Saturday. Superior South Central 11410 11500 11410 11610 11400 11300 11310 11210. Waves 2 feet or less. Superior East 12310 11420 11520 11510 13310. Waves 1 to 3 feet. $$ BW Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes