####018012905#### FZUS63 KMQT 192002 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 402 PM EDT Fri Apr 19 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... Low pressure is centered over western James Bay at 29.6 inches this afternoon. This low pressure slowly moves into northern Quebec through Saturday morning, deepening to 29.3 inches. Meanwhile, a 30.4 inch high pressure ridge builds southeast into the Northern Plains extending weak 30.0 inch ridging across western Lake Superior. The ridge builds to 30.1 inches on Saturday, creating a tight southwest to northeast pressure gradient over the lake Saturday morning. The gradient begins to slack on Sunday as 30.3 inch high pressure slides into the southern Plains, and a weak 29.9 inch trough extending from Quebec dips over the east half of Lake Superior. A brief period of 30.1 inch high pressure meanders south out of the Canadian Prairie Sunday night into Monday before broad 29.6 inch low pressure begins moving eastward into the Great Lakes on Tuesday. This low centers over Lake Superior Tuesday morning at 29.6 inches then weakens to 29.8 inches over the lower Great Lakes through the day. 30.3 inch high pressure over northern Ontario follows in its wake Wednesday. LSZ162-200415- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 402 PM EDT Fri Apr 19 2024 /302 PM CDT Fri Apr 19 2024/ .LATE THIS AFTERNOON...West winds 20 to 30 knots. A chance of rain and snow showers. Waves 4 to 7 feet occasionally to 9 feet subsiding to 3 to 6 feet occasionally to 8 feet. .TONIGHT...West winds 15 to 25 knots increasing to 20 to 30 knots after midnight, then veering northwest late. A slight chance of rain and snow showers through midnight. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .SATURDAY...Northwest winds 15 to 25 knots backing west in the afternoon. Waves subsiding to 2 to 4 feet. .SATURDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to 1 to 3 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 building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .SUNDAY NIGHT...Northeast winds 5 to 15 knots veering east after midnight. Waves subsiding to calm to 2 feet. .MONDAY...East winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 15 to 25 knots becoming northeast 20 to 30 knots after midnight. Rain showers. Snow showers likely after midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...Northeast winds 20 to 30 knots diminishing to 15 to 25 knots. A chance of rain showers, possibly mixed with snow. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet. .WEDNESDAY...East winds 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ263-200415- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 402 PM EDT Fri Apr 19 2024 ...GALE WARNING IN EFFECT UNTIL 11 PM EDT THIS EVENING... .LATE THIS AFTERNOON...West winds 20 to 30 knots with a few gale force gusts to 35 knots possible. Sprinkles. Waves 6 to 10 feet occasionally to 13 feet. .TONIGHT...West winds 15 to 25 knots with a few gale force gusts to 35 knots possible veering northwest late. A slight chance of rain showers through midnight. A slight chance of snow showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet. .SATURDAY...Northwest winds 15 to 25 knots backing west in the afternoon. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .SATURDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to 20 knots after midnight, then increasing to 15 to 25 knots late. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .SUNDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots by mid afternoon. Waves subsiding to 2 to 4 feet. .SUNDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. Waves subsiding to calm to 2 feet. .MONDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 15 to 25 knots. Rain showers likely. Waves building to 3 to 5 feet occasionally to 7 feet. .TUESDAY...Northeast winds 15 to 25 knots. A chance of snow showers. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...Northeast winds 10 to 20 knots becoming south 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ264-200415- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 402 PM EDT Fri Apr 19 2024 ...GALE WARNING IN EFFECT UNTIL 11 PM EDT THIS EVENING... .LATE THIS AFTERNOON...West gales to 35 knots. Sprinkles. Waves 7 to 10 feet occasionally to 13 feet. .TONIGHT...West winds 20 to 30 knots with a few gale force gusts to 35 knots possible diminishing to 15 to 25 knots after midnight, then veering northwest late. A slight chance of rain showers. A slight chance of snow showers after midnight. Waves subsiding to 4 to 7 feet occasionally to 9 feet. .SATURDAY...Northwest winds 15 to 25 knots backing west in the afternoon, then increasing to 20 to 30 knots late. Waves subsiding to 3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet occasionally to 9 feet. .SATURDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to 20 knots after midnight, then increasing to 15 to 25 knots late. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .SUNDAY...Northwest winds 15 to 25 knots becoming north 10 to 20 knots by mid afternoon. Waves subsiding to 2 to 4 feet. .SUNDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. Waves subsiding to calm to 2 feet. .MONDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 10 to 20 knots becoming east 15 to 25 knots after midnight. A chance of rain showers through midnight, then rain showers likely after midnight. Waves building to 2 to 4 feet. .TUESDAY...North winds 15 to 25 knots. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. .WEDNESDAY...North winds 10 to 20 knots becoming south 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ265-200415- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 402 PM EDT Fri Apr 19 2024 ...GALE WARNING IN EFFECT UNTIL 2 AM EDT SATURDAY... .LATE THIS AFTERNOON...West winds 20 to 30 knots with a few gale force gusts to 35 knots possible. Waves 3 to 6 feet occasionally to 8 feet building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .TONIGHT...West winds 20 to 30 knots with a few gale force gusts to 35 knots possible. A slight chance of snow showers, possibly mixed with rain after midnight. Waves 3 to 6 feet occasionally to 8 feet. .SATURDAY...Northwest winds 20 to 30 knots backing west in the afternoon, then diminishing to 15 to 25 knots late. A slight chance of snow showers through early afternoon. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .SATURDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet. .SUNDAY...Northwest winds 15 to 25 knots becoming north 10 to 20 knots by mid afternoon. Waves subsiding to 1 to 3 feet. .SUNDAY NIGHT...East winds 10 to 20 knots becoming southeast 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .MONDAY...South winds 10 to 20 knots backing east by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southeast winds 15 to 25 knots backing east after midnight. A chance of rain showers through midnight, then rain showers likely after midnight. Waves building to 1 to 3 feet. .TUESDAY...North winds 20 to 30 knots. Rain showers, possibly mixed with snow. Waves building to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...North winds 10 to 20 knots veering south. Waves subsiding to calm to 2 feet. $$ LSZ266-200415- 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- 402 PM EDT Fri Apr 19 2024 ...GALE WARNING IN EFFECT UNTIL 2 AM EDT SATURDAY... .LATE THIS AFTERNOON...West gales to 35 knots. Waves 7 to 10 feet occasionally to 13 feet. .TONIGHT...West winds 20 to 30 knots with a few gale force gusts to 35 knots possible veering northwest late. A slight chance of rain and snow showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .SATURDAY...Northwest winds 20 to 30 knots backing west late. A slight chance of snow showers through early afternoon. Waves building to 6 to 9 feet occasionally to 11 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. .SATURDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet occasionally to 9 feet. .SUNDAY...Northwest winds 15 to 25 knots becoming north 10 to 20 knots by mid afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .SUNDAY NIGHT...North winds 5 to 15 knots veering south after midnight. Waves subsiding to 1 to 3 feet. .MONDAY...South winds 10 to 20 knots backing southeast by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...Southeast winds 15 to 25 knots. A chance of rain showers through midnight, then rain showers likely after midnight. Waves building to 2 to 4 feet. .TUESDAY...North winds 20 to 30 knots. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...North winds 15 to 25 knots becoming southwest 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ267-200415- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 402 PM EDT Fri Apr 19 2024 ...GALE WARNING IN EFFECT UNTIL 2 AM EDT SATURDAY... .LATE THIS AFTERNOON...West gales to 35 knots. Waves 5 to 9 feet occasionally to 11 feet. .TONIGHT...West gales to 35 knots. A slight chance of rain and snow showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .SATURDAY...Northwest winds 20 to 30 knots increasing to gales to 35 knots in the afternoon, then backing west late. A slight chance of snow showers through early afternoon. Waves building to 5 to 9 feet occasionally to 11 feet. .SATURDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet occasionally to 9 feet. .SUNDAY...West winds 20 to 30 knots veering northwest by mid afternoon. Waves building to 4 to 8 feet occasionally to 10 feet. .SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming southeast 10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet. .MONDAY...South winds 10 to 20 knots backing southeast by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...Southeast winds 15 to 25 knots. Rain showers likely after midnight. Waves building to 1 to 3 feet. .TUESDAY...North winds 20 to 30 knots. A chance of rain showers. Waves building to 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...North winds 15 to 25 knots becoming northwest 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ261-200415- MAFOR 1921/ Superior West...GALE WARNING IN EFFECT...11640 12630 13730 12630. Waves 5 to 8 feet subsiding to 3 to 6 feet tonight subsiding to 2 to 4 feet Saturday. Superior North Central...GALE WARNING IN EFFECT...11650 12640 11740 13730 11640. Waves 7 to 11 feet subsiding to 5 to 8 feet tonight then subsiding to 3 to 6 feet Saturday. Superior South Central...GALE WARNING IN EFFECT...14640 11740 11730 11740 11640. Waves 4 to 7 feet. Superior East...GALE WARNING IN EFFECT...14640 14740. Waves 6 to 9 feet. $$ WFO MQT Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes