Tuesday, October27, 2020
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Marine Weather and Tides
Grand Marais, MN

Version 3.4
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8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 8:34AMSunset 6:47PM Tuesday October 27, 2020 11:06 AM EDT (15:06 UTC) Moonrise 4:52PMMoonset 3:14AM Illumination 82% Phase: Waxing Gibbous; Moon at 11 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 644 Pm Cdt Fri Sep 25 2020
.strong Thunderstorms over western lake superior... The areas affected include... 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... At 644 pm cdt, doppler radar indicated strong Thunderstorms, capable of producing winds to around 30 knots, small hail, and frequent cloud to water lightning. These strong Thunderstorms were located along a line extending from 11 nm southwest of horseshoe bay and safe harbor, to 26 nm east of tofte, to 22 nm southeast of tofte safe harbor, moving east at 45 knots. The strong Thunderstorms will remain over mainly open waters. Precautionary/preparedness actions... Mariners can expect wind gusts up to 33 knots...locally higher waves...cloud to water lightning strikes...small hail...and heavy downpours. Boaters should seek safe harbor until these storms pass. Intense lightning is occurring with these storms. If caught on the open water...stay below deck if possible and keep away from ungrounded metal objects. && lat...lon 4717 9010 4729 9059 4779 9023 4779 8969
LSZ140 Expires:202009260015;;363074 FZUS73 KDLH 252344 MWSDLH Marine Weather Statement National Weather Service Duluth MN 644 PM CDT Fri Sep 25 2020 LSZ140-141-162-260015-


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 271122 AFDDLH

Area Forecast Discussion National Weather Service Duluth MN 622 AM CDT Tue Oct 27 2020

DISCUSSION. (Today through Tuesday) Issued at 349 AM CDT Tue Oct 27 2020

Clear skies and a cold air mass still in place over the Northland this morning will have the day starting with wind chill values in the single digits. Today, pressure gradient will begin to strengthen resulting in gusty winds out of the southeast. A low pressure system will glide across the Canadian Prairies today with a branch of the warm front draped through the Northern Plains. The isentropic lift associated with the the warm air advection will instigate some snow showers across the Borderlands heading into the afternoon and evening hours. Lack of deep level moisture and weak lapse rates will result in light snow with negligible accumulation totals. Precipitation activity is expected to wane overnight.

The exiting low pressure across Canada will have it's cold front sweep across the Borderlands early Wednesday. Ample moisture on the backside of the low combined with a strong vort max will incite a wintry mix. Loss of ice crystals within the dendritic growth zone could lead to freezing rain in the morning. Temperatures are expected to warm through the day as the cold air mass departs to the east. Precipitation will transition to mostly rain before noon. This last batch of rain will taper off Wednesday evening.

A surface high pressure setting up over central Canada will promote some northerly winds across Lake Superior. We have added the mention of some snow showers in Iron and Ashland counties for Thursday to account of Lake effect snow/rain showers. Elsewhere, the region will stay dry through most of the forecast period. Temperatures will begin to regulate back to normal highs for October with some potential to be above average (mid to upper 40s) for Halloween.

This weekend an upper level trough traverses across the country with it's associated surface low moving through Canada. A few of the 00Z suite of model guidance suggests some precipitation over the Arrowhead Saturday evening. There is still a rather high amount of model disagreement with the QPF field. For now, we have added the mention of a slight chance.

After the trough passage, an upper level ridge builds in from the west. A surge of warm air at 850mb will help temperatures climb once again to start the work week. Some areas could even break back into the 50s by Tuesday.

AVIATION. (For the 12Z TAFS through 12Z Wednesday morning) Issued at 620 AM CDT Tue Oct 27 2020

VFR conditions are expected throughout the majority of today. Strong southwesterly winds will stream across the region with gusts upwards of 25 kts. An approaching weather system will glide across the Canadian Prairies giving way to light snowfall across northern MN. A few bursts of snowfall could reduce visibility at INL to IFR or worse at times. Overall, snowfall amounts are expected to be negligible with this system. MVFR ceilings will filter in across northern MN behind the exiting system with some model guidance suggesting IFR ceilings at INL overnight. Additionally, expanded the coverage of low level wind shear this evening to encompass DLH/BRD/HYR.

MARINE. Issued at 349 AM CDT Tue Oct 27 2020

Increasing pressure gradient over Lake Superior has resulted in gusty southwest winds. A small craft advisory is currently in effect and will be upgraded to a Gale warning at 10 AM. In addition to gale- force winds, waves will build today. The highest waves of 8 to 11 feet are expected to be northeast of Grand Marais. Elsewhere, waves are expected to be 4 to 8 feet. The Gale warning is set to expire tomorrow at 4 AM. At which time a small craft advisory will likely be needed for all near shore waters. Winds and waves are expected to taper off Wednesday afternoon.

PRELIMINARY POINT TEMPS/POPS. DLH 30 26 43 25 / 0 10 10 10 INL 33 28 40 22 / 30 30 50 10 BRD 30 27 42 25 / 0 10 10 0 HYR 32 25 43 25 / 0 10 10 10 ASX 34 28 45 28 / 0 10 10 10

DLH WATCHES/WARNINGS/ADVISORIES. WI . None. MN . None. LS . Small Craft Advisory until 10 AM CDT this morning for LSZ121- 140>148.

Gale Warning from 10 AM this morning to 4 AM CDT Wednesday for LSZ121-140>148.



DISCUSSION . Britt AVIATION . Britt MARINE . Britt


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GD5 - 9099090 - Grand Marais, MN 26 mi49 min 25°F 51°F1019.9 hPa13°F
KGNA 26 mi71 min W 12 G 22 25°F 1021.6 hPa11°F
ROAM4 - Rock of Ages, MI 30 mi67 min SW 25 G 32 29°F 1022.1 hPa (-2.0)
45006 - W SUPERIOR 48NM North of Ironwood, MI 37 mi27 min SW 23 G 31 29°F 43°F1021.6 hPa19°F
DISW3 - Devils Island, WI 71 mi67 min SW 16 G 23 26°F 1022.1 hPa (-2.0)19°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Grand Marais, The Bay of Grand Marais, MN26 mi71 minW 12 G 22 mi25°F10°F55%1021.6 hPa

Link to 5 minute data for KGNA

Wind History from GNA (wind in knots)
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Last 24hr6435W73W33W4W4W4--34W6W9
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1 day agoNW3CalmN4SW3S43W3CalmNW434N8N7N7N10
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2 days ago--N7
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Marquette, MI
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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.