Great Lakes Forecast
Issued by NWS
Issued by NWS
248 FZUS63 KMQT 191349 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 949 AM EDT Wed Jun 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...Ridging builds over Lake Superior today through tonight as a strengthening high pressure arrives over Lake Superior by Thursday at 30.4 inches and remains through Friday as it slowly weakens. By Friday night, the high weakens to 30.2 inches and slides east. Low pressure of 29.7 inches lifts off of the Colorado Rockies Friday night and deepens to 29.6 inches by the time it arrives over Lake Superior Saturday. The troughing over Lake Superior deepens to at least 29.5 inches by Saturday night as the low strengthens while moving eastward into northern Ontario. By Sunday, the troughing over the lake gives way to weak ridging of 29.8 inches as a weak high pressure of 30.0 inches moves through the Northern Plains. The ridging remains over Lake Superior through Monday as the high moves through the Midwest. LSZ162-192200- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 949 AM EDT Wed Jun 19 2024 /849 AM CDT Wed Jun 19 2024/ .REST OF TODAY...West winds 15 to 25 knots diminishing to 5 to 15 knots. Waves 3 to 5 feet occasionally to 7 feet subsiding to calm to 2 feet. .TONIGHT...West winds 5 to 15 knots veering north late. Waves calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon, then veering east late. Waves calm to 2 feet. .THURSDAY NIGHT...Northeast winds 5 to 15 knots. A slight chance of showers after midnight. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. A chance of showers through early afternoon. Showers likely by mid afternoon. Waves building to 1 to 3 feet. .FRIDAY NIGHT...Northeast winds 10 to 20 knots. Showers and a chance of thunderstorms. Waves 1 to 3 feet. .SATURDAY...Northeast winds 10 to 20 knots backing west. Showers likely. A chance of thunderstorms. A chance of showers. Waves subsiding to calm to 2 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ263-192200- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 949 AM EDT Wed Jun 19 2024 .REST OF TODAY...West winds 20 to 30 knots diminishing to 10 to 20 knots. Waves 4 to 7 feet occasionally to 9 feet subsiding to 1 to 3 feet. .TONIGHT...West winds 5 to 15 knots veering north late. Waves subsiding to calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots veering east late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots. A slight chance of showers after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. Showers and a chance of thunderstorms. Waves calm to 2 feet. .SATURDAY...Northeast winds 10 to 20 knots becoming west 5 to 15 knots. Showers likely. A chance of thunderstorms. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ264-192200- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 949 AM EDT Wed Jun 19 2024 .REST OF TODAY...West winds 20 to 30 knots diminishing to 10 to 20 knots late. Waves 4 to 7 feet occasionally to 9 feet subsiding to 2 to 4 feet. .TONIGHT...West winds 5 to 15 knots becoming northwest less than 10 knots late. Waves subsiding to calm to 2 feet. .THURSDAY...North winds less than 10 knots becoming east 5 to 15 knots in the afternoon, then veering south late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds less than 10 knots. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves calm to 2 feet. .SATURDAY...East winds 10 to 20 knots becoming northwest 5 to 15 knots. Showers likely. A chance of thunderstorms. A chance of showers. Waves building to 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ265-192200- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 949 AM EDT Wed Jun 19 2024 .REST OF TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots late. Isolated showers and thunderstorms by late morning. Waves 1 to 3 feet building to 2 to 4 feet, then subsiding to calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots backing west after midnight, then veering northwest late. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots veering east late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds less than 10 knots. A slight chance of showers. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. Showers and a chance of thunderstorms. Waves calm to 2 feet. .SATURDAY...Southeast winds 10 to 20 knots veering northwest. Showers. A chance of thunderstorms. A chance of showers. Waves calm to 2 feet. .SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to 20 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ266-192200- 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- 949 AM EDT Wed Jun 19 2024 .REST OF TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots late. Scattered showers and thunderstorms by late morning. Waves 3 to 6 feet occasionally to 8 feet building to 4 to 7 feet occasionally to 9 feet, then subsiding to 2 to 4 feet. .TONIGHT...Northwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .THURSDAY...North winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY NIGHT...North winds 5 to 15 knots diminishing to less than 10 knots after midnight. A slight chance of showers. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. A chance of showers through midnight. A chance of thunderstorms. Showers after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 10 to 20 knots veering northwest. Showers. A chance of thunderstorms. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SUNDAY...Northwest winds 10 to 20 knots. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ267-192200- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 949 AM EDT Wed Jun 19 2024 .REST OF TODAY...Southwest winds 15 to 25 knots veering west in the afternoon, then becoming northwest 10 to 20 knots late. Scattered showers and thunderstorms. Waves 2 to 4 feet. .TONIGHT...Northwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .THURSDAY...North winds 5 to 15 knots backing northwest in the afternoon, then increasing to 10 to 20 knots late. Waves calm to 2 feet. .THURSDAY NIGHT...North winds 5 to 15 knots. A slight chance of showers. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. A chance of showers. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots becoming southeast 10 to 20 knots after midnight. A chance of showers through midnight, then showers after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 10 to 20 knots veering northwest. Showers and a chance of thunderstorms. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .SUNDAY...Northwest winds 10 to 20 knots. A chance of showers. Waves building to 1 to 3 feet. $$ LSZ261-192200- MAFOR 1915/ Superior West 11630 12620 11510 11600 11800 11100 11200. Waves 3 to 5 feet subsiding to 2 to 3 feet this afternoon. Waves 1 to 3 feet subsiding to 1 foot or less tonight. Waves 1 foot or less Thursday morning. Superior North Central 11640 11630 11620 11610 11600 12700 11800. Waves 4 to 7 feet subsiding to 3 to 6 feet this afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight. Waves 1 to 2 feet Thursday morning. Superior South Central 12630 11620 11710 11600 12700 11800. Waves 2 to 4 feet this afternoon. Waves 1 to 3 feet subsiding to 1 foot or less tonight. Waves 1 foot or less Thursday morning. Superior East 12630 11720 11710 12700 12800. Waves 3 to 5 feet this afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight. Waves 1 to 2 feet Thursday morning. $$ TAP Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes