Grand Marais, MN Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Grand Marais, MN

June 15, 2024 2:10 PM EDT (18:10 UTC) Change Location
Sunrise 5:53 AM   Sunset 10:02 PM
Moonrise 2:29 PM   Moonset 1:38 AM 
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NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

Marine Forecasts
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LSZ162 Lake Superior West Of A Line From Saxon Harbor Wi To Grand Portage Mn Beyond 5nm- 936 Am Edt Sat Jun 15 2024 /836 Am Cdt Sat Jun 15 2024/

Rest of today - East winds 5 to 15 knots increasing to 10 to 20 knots late. A slight chance of showers by late morning. Waves calm to 2 feet.

Tonight - East winds 10 to 20 knots increasing to 15 to 25 knots late. A chance of showers through midnight. A chance of Thunderstorms. Showers likely after midnight. Waves building to 1 to 3 feet.

Sunday - East winds 10 to 20 knots. A chance of showers and Thunderstorms. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet.

Sunday night - Northeast winds 10 to 20 knots becoming west 5 to 15 knots after midnight. A chance of showers and Thunderstorms. Waves calm to 2 feet.

Monday - West winds 5 to 15 knots becoming northeast 10 to 20 knots by mid afternoon. A chance of showers through early afternoon. A chance of Thunderstorms. Showers likely by mid afternoon. Waves calm to 2 feet.

Monday night - Northeast winds 10 to 20 knots veering east after midnight. Thunderstorms likely through midnight. Showers likely. A chance of Thunderstorms after midnight. Waves calm to 2 feet.

Tuesday - South winds 10 to 20 knots veering west. Showers likely and a chance of Thunderstorms. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

Wednesday - West winds 10 to 20 knots becoming north 5 to 15 knots. A chance of showers. Waves calm to 2 feet.

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7 Day Forecast for Marine Location Near Grand Marais city, MN
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Area Discussion for - Duluth, MN
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Area Forecast Discussion National Weather Service Duluth MN 1244 PM CDT Sat Jun 15 2024


- Showers and thunderstorms today and tonight. Severe weather is not expected, but heavy rainfall could cause localized minor flooding mainly in northwest Wisconsin tonight (~25% chance).

- Isolated strong to severe thunderstorms are possible late Sunday afternoon and evening (~5% chance). Large hail and strong winds are the main threats.

- The threat for very heavy rain and flash flooding is increasing Monday through Tuesday (~35% chance), and scattered strong to severe storms capable of producing large hail are also possible (15% chance) Monday afternoon into Monday night.

Issued at 452 AM CDT Sat Jun 15 2024

Showers have been persistent for parts of northeast Minnesota this morning with some lift from a passing wave aloft. This area of rain will continue but gradually diminish around mid-day.
Then, increasingly strong southerly flow containing warm air and moisture will advect northward this afternoon into tonight, and in association with a broader shortwave passing by aloft, an area of rain and embedded thunderstorms is expected to develop.
PWATs rising to 1.50"-1.75" will be supportive for heavy rain, mainly in northwest Wisconsin, through early Sunday morning. NBM probabilities for >1" are ~40%, and >2" about 10%. Most model ensembles are in good agreement for around 1"-2", and with this first round of rain being fairly progressive, the threat for flash flooding will be pretty low, but about 25% chance for some localized minor flooding given already saturated soils from previous rains.

Strong warm air advection on Sunday will lead to some pretty impressive instability building, though we will also have a strong cap in place. This will combine with weak subsidence aloft to suppress thunderstorm potential (but not completely).
If we can get the cap to bust, there's potential for 2-3k J/kg of MUCAPE to be realized. The latest short-range models suggest a weak cold front could act as an initial trigger for thunderstorms late Sunday evening. Given the initially elevated nature of these storms, large hail will be the main threat (5% chance). But if they can get organized, they could form a line as they traverse east into northwest Wisconsin Sunday evening, and then a threat for damaging winds could develop (5% chance).
These storms should push east late Sunday night.

Another threat Sunday will be some pretty hot temperatures with some sunshine before storms develop. Highs in the upper 80s are expected in east-central Minnesota and northwest Wisconsin.
Those sensitive to heat, especially without effective cooling or adequate hydration, will be most at risk for being affected by these toasty temperatures.

After a very brief potential break in rain for a time late Sunday night, the next round is expected Monday morning as a strong and very moist southwesterly jet sets up aloft, attendant with several passing upper level waves. A very strong push of warm/moist southerly flow at the surface will develop Monday afternoon, and models continue to very highly suggest that there will be strong frontogenesis in the form of a warm front that will set up somewhere in the upper Midwest. At this point, it's looking most likely anywhere from southern Minnesota up to northern Minnesota, with a west-to-east axis from the Dakotas into Upper Michigan. It's still unclear where exactly in this area the front will set up, but there's starting to be a little more agreement in recent model runs. Another piece of uncertainty is how transient the front will be. If it becomes quasi-stationary for a time, then the threat for localized, high-impact flash flooding becomes a real possibility. If it has gradual movement, then the threat for flash flooding still remains high, but impacts could be moderated a bit and more spread out. At this time, it looks like the front may be more slowly moving (i.e. transient), but this could certainly change. Either solution is not a good one, because with PWAT values potentially reaching around 2" (just about as high as they ever get around here), the threat for flash flooding somewhere around the region Monday evening through Tuesday is increasing (~35% at this time). Model soundings are suggestive of deep saturation in the low levels, which means warm rain processes more commonly found in tropical regions (collision- coalescence) may occur here, and this is very efficient at producing heavy rainfall accumulations.

With elevated instability increasing Monday night, there is also a threat for some scattered severe storms (~5-15% chance). Given that most of these will be elevated, large hail will be the main threat, and the potential for severe storms will also be dependent on where the warm front sets up.

Going into Tuesday, a cold front is likely to pass through and bring more chances for scattered severe storms (~5-15% chance).
Damaging winds may be the greatest threat with these as storms likely form into a line that passes through from west to east and gradually ends both the heavy rain and severe storm threat around Tuesday evening or so.

Perhaps a break in the active weather on Wednesday as models suggest possible high pressure, then it looks like potentially more active weather late-week into next weekend.

Issued at 1245 PM CDT Sat Jun 15 2024

A few isolated showers are moving out of far northern Minnesota early this afternoon, with conditions remaining VFR for at least a few hours. However, another round of rain will move into the region from the south by mid-afternoon, primarily affecting KBRD/KDLH through this evening/early overnight and lingering at KHYR from this afternoon into early Sunday morning.

Ceilings gradually fall into MVFR for most sites this evening, then IFR to LIFR overnight into Sunday morning, with a 20% chance for DLH to even hit VLIFR ceilings. Sites with rain will also see MVFR to locally IFR visibilities develop with and immediately behind the rain. Some embedded thunderstorms are possible near KBRD and particularly KHYR this evening and overnight.

Southerly winds increase today with gusts to around 20 knots into this evening, though weaken slightly overnight for all but KHYR.

Issued at 426 AM CDT Sat Jun 15 2024

Northeast winds develop today from around 5-10 kt, gusting up to 20 kt this afternoon. Waves up to 2 or perhaps 3 ft locally are expected. Winds only slightly weaken tonight into Sunday, remaining east to northeasterly. Rain and thunderstorms are expected tonight through Sunday morning, especially along the South Shore. Scattered strong to severe storms capable of producing large hail or strong winds are possible Sunday late afternoon and evening (~5% chance).

For the open water discussion, refer to the NWS Marquette Area Forecast Discussion at


Weather Reporting Stations
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Stations Dist Age Wind AirWater WavesinHgDewPt
GD5 - 9099090 - Grand Marais, MN 26 mi71 min 53°F 48°F30.0149°F
KGNA 26 mi75 minE 5.1 53°F 30.0545°F
ROAM4 - Rock of Ages, MI 29 mi71 minS 11G11 57°F 30.09
45006 - W SUPERIOR 48NM North of Ironwood, MI 37 mi51 minE 3.9G3.9 47°F 40°F30.0644°F
DISW3 - Devils Island, WI 71 mi71 minNNE 5.1G7 50°F 30.0549°F

Airport Reports
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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KCKC27 sm26 minSW 08G1410 smClear70°F37°F31%30.03
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