Wednesday, January22, 2020
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Marine Weather and Tides
Grand Marais, MN

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 8:36AMSunset 5:41PM Wednesday January 22, 2020 9:24 PM EST (02:24 UTC) Moonrise 7:03AMMoonset 3:36PM Illumination 5% Phase: Waning Crescent; Moon at 28 days in cycle
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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LSZ140 726 Pm Cdt Mon Sep 30 2019
.an line of Thunderstorms approaching western lake superior... The areas affected include... Duluth mn to port wing wi... Grand marais to taconite harbor mn... Grand portage to grand marais mn... Lake superior west of a line from saxon harbor wi to grand portage mn beyond 5nm... Port wing to sand island wi... Sand island to bayfield wi... Silver bay harbor to two harbors mn... Taconite harbor to silver bay harbor mn... Two harbors to duluth mn... At 726 pm cdt, doppler radar indicated a line of Thunderstorms, capable of producing winds to around 30 knots and cloud to water lightning. This area of Thunderstorms was located along a line extending from 13 nm northwest of beaver bay, to 16 nm west of duluth lift bridge channel, moving east at 40 knots. Locations impacted include... Raspberry island lighthouse, split rock bay, castle danger, sand island, barkers island, sugar loaf cove, horseshoe bay and safe harbor, tofte safe harbor, duluth lift bridge channel, twin points safe harbor, tofte, beaver bay, mouth of the cross river, bayfield peninsula sea caves, brule point, herbster, larsmont, superior harbor, and french river. Precautionary/preparedness actions... Mariners can expect gusty winds to around 33 knots...locally higher waves...and lightning strikes. Boaters should seek safe harbor immediately until these storms pass. && lat...lon 4669 9229 4668 9224 4679 9214 4715 9149 4754 9093 4773 9051 4799 8945 4690 9080 4693 9086 4692 9095 4684 9110 4674 9149 4666 9201 4671 9210 4665 9213 4664 9229
LSZ140 Expires:201910010230;;606186 FZUS73 KDLH 010026 MWSDLH Marine Weather Statement National Weather Service Duluth MN 726 PM CDT Mon Sep 30 2019 LSZ140>147-162-010230-


7 Day Forecast for Marine Location Near Grand Marais, MN
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location: 47.86, -89.87     debug


Area Discussion for - Duluth, MN
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FXUS63 KDLH 222357 AFDDLH

Area Forecast Discussion National Weather Service Duluth MN 557 PM CST Wed Jan 22 2020

SHORT TERM. (This evening through Thursday night) Issued at 341 PM CST Wed Jan 22 2020

Weak forcing from a low far to our southeast will cause a wintry mix (including freezing drizzle) to sneak through the area from the southeast tonight and eventually the column cools enough to turn most of that into snow. Snowfall amounts will be 3 to 5" across portions of our northwestern Wisconsin counties while most of northeast Minnesota will remain snow-free. QPF is light with this system, but it will remain in the vicinity for the entire short term period, thus the longevity will allow accumulations to slowly build. This system is driving moisture into the region with a relatively warm air mass compared to the snowpack, so fog may be an issue tonight, but will have to keep an eye on this for future headline potential. Similarly, the snowfall across north-central Wisconsin will also have to be watched. For now, kept headlines off the table due to the slow accumulation of snow. Not confident enough in the degree of the visibility reductions as well, so just have a mention of fog in the forecast. Northeast flow will pick up across Lake Superior and this may locally enhance snowfall amounts along the eastern portion of the Bayfield Peninsula.

LONG TERM. (Friday through Wednesday) Issued at 341 PM CST Wed Jan 22 2020

Cloudy with above average temperatures and intermittent light precip chances through next week.

A broad upper level trough will sit over the Northland on Friday, slowly migrating east over the weekend. Scattered snow showers, possibly mixed with some freezing drizzle or drizzle, will be possible on Friday before largely coming to an end Friday night from west to east. Light northeasterly winds may provide a bit of lake enhancement along the western shores of Lake Superior, but overall, expecting snow accumulations to be very light as surface and mid- level temperatures will be too warm to support robust lake-effect processes. Highs in the 30s will be common on Friday and through the middle part of next week.

The upper level trough will move east over the weekend, bringing dry conditions. However, lingering low-level moisture will likely keep skies mostly cloudy with some areas of fog possible. Going into Monday, long-range models suggest upper level ridging will move into the upper Midwest, but some embedded short waves may produce some light sprinkles or flurries and keep skies cloudy. A larger storm system is hinted at mid-week as an upper level trough moves in with surface cyclogenesis. The GFS takes this system the furthest northwest, which would bring snowfall or mixed precipitation to northwest Wisconsin, while the ECMWF is further southeast. At this time, there is too much uncertainty to determine where (or if) this system will cause notable impacts for the Northland, but it will be something to keep an eye on.

AVIATION. (For the 00Z TAFS through 00Z Thursday evening) Issued at 557 PM CST Wed Jan 22 2020

A strong area of low pressure over Iowa is slowly drifting northeast across the region, with MVFR conditions across the region. Low clouds and scattered snow showers will move north into the region later tonight, bringing conditions down to IFR and possibly LIFR for HYR, BRD, and DLH. Conditions look to remain at least IFR through the end of the TAF period. A weak cold front will pass through the region tomorrow morning, causing a wind shift from southwest to easterly, with gusty afternoon winds possible around DLH.

PRELIMINARY POINT TEMPS/POPS. DLH 27 30 24 31 / 30 50 60 40 INL 15 24 11 28 / 0 10 10 0 BRD 26 32 23 31 / 20 50 30 10 HYR 28 34 27 36 / 50 60 50 30 ASX 27 32 27 34 / 60 80 70 40

DLH WATCHES/WARNINGS/ADVISORIES. WI . None. MN . None. LS . None.

SHORT TERM . Wolfe LONG TERM . JDS AVIATION . KL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KGNA 26 mi29 min Calm 30°F 1015.1 hPa23°F
GD5 - 9099090 - Grand Marais, MN 26 mi55 min 29°F 1013.4 hPa26°F
ROAM4 - Rock of Ages, MI 30 mi25 min N 13 G 15 28°F 1016.7 hPa (+2.5)
DISW3 - Devils Island, WI 71 mi85 min S 4.1 G 6 33°F 1013.7 hPa (+1.6)33°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for KGNA

Wind History from GNA (wind in knots)
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W8W6W6W7W7SW8SW9SW8W8W6CalmN3CalmCalm
1 day agoW6W6W6NW4W6W7W75W6W9
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2 days agoCalmCalmCalmCalmE3CalmCalmSE5NE4CalmCalmS4SE3CalmS4SW53W53SW5W4NW4NW3W4

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Duluth, MN (21,6,7,8)
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Ground Weather Radar Station Marquette, MI
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.