Wednesday, January29, 2020
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Marine Weather and Tides
Superior, WI

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 7:34AMSunset 5:08PM Wednesday January 29, 2020 5:33 AM CST (11:33 UTC) Moonrise 10:08AMMoonset 10:02PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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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LSZ145 /o.exp.kdlh.ma.w.0030.000000t0000z-191001t0215z/ 912 Pm Cdt Mon Sep 30 2019
.the special marine warning will expire at 915 pm cdt... The affected areas were... Duluth mn to port wing wi... Lake superior west of a line from saxon harbor wi to grand portage mn beyond 5nm... Port wing to sand island wi... The Thunderstorm has moved out of the warned area and no longer poses a significant threat to boaters. Lat...lon 4685 9162 4690 9139 4678 9138 4674 9150 4672 9160 4672 9161 time...mot...loc 0212z 265deg 44kt 4677 9127
LSZ145 Expires:201910010222;;609953 FZUS73 KDLH 010212 MWSDLH Marine Weather Statement National Weather Service Duluth MN 912 PM CDT Mon Sep 30 2019 LSZ145-146-162-010222-


7 Day Forecast for Marine Location Near Superior, WI
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location: 46.71, -92.01     debug


Area Discussion for - Duluth, MN
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FXUS63 KDLH 291025 AFDDLH

Area Forecast Discussion National Weather Service Duluth MN 425 AM CST Wed Jan 29 2020

SHORT TERM. (Today through Thursday) Issued at 424 AM CST Wed Jan 29 2020

Widespread low-level stratus clouds blanket the region as they have for many days. Some higher clouds are passing through as well out ahead of a shortwave trough that will pass through from west to east today. Weak lift has continued to produce areas of flurries or light freezing drizzle, similar to previous nights. The HRRR/RAP models suggest that this could persist through the day and possibly into tonight and Thursday as low level moisture remains. For now, kept a mention of flurries in the forecast just for today since confidence is highest with the passing of the shortwave trough. Would not be surprised if there is a bit of light freezing drizzle mixed in as well with a slightly warmer temperature profile than yesterday, but impacts should be very minimal as precipitation is expected to be very light and spotty. Otherwise, cloudy skies with temperatures rising into the mid-20s will be the story today for most areas.

Another issue will be some light lake-effect snow affecting mainly the North Shore. Light anticyclonic flow around high pressure centered in Ontario will produce southeasterly winds over Lake Superior, and with 850-mb temperatures hovering around -10C, this will be just cold enough to produce some lake-effect snow showers. An area of clearing over northeastern Lake Superior this morning reveals that there are some cloud streets over the open waters already, and there are some weak radar returns up towards Two Harbors that are indicative of lake processes. Short-range models (HRRR/NAM/WNMM) suggest that wind convergence will favor the development of single-banded lake-effect snow showers. This weak wind setup is also ideal for the formation of mesoscale vortices. Since low-level moisture will be limited, snow totals are not expected to be impressive. Affected areas, mainly northeast of Two Harbors, may see up to an inch of snow. However, it is worth noting that these single-band/mesoscale vortex setups are known to produce higher amounts if they persist over the same area for a long time. While the chance is low, there is a slight possibility for some locally higher amounts, especially near Silver Bay, where models suggest a several-hour duration of light snow today. This lake-effect activity will slowly migrate up the North Shore Wednesday night into Thursday morning.

Some patchy fog/freezing fog will be possible late Wednesday night into Thursday morning with low level moisture still persisting. Winds will become southerly Wednesday night as another weak shortwave approaches from the west Thursday morning. This will keep clouds around and perhaps introduce the chance for some snow flurries as well. Wednesday night lows will dip into the teens with highs in the mid-20s Thursday.

LONG TERM. (Thursday night through Tuesday) Issued at 424 AM CST Wed Jan 29 2020

Weak and generally zonal flow is expected through the weekend. Temperatures trend colder early next week.

A shortwave trough will move through the region Thursday night and stall over the western Great Lakes on Friday. A second shortwave trough will move into the Canadian Prairies by Friday evening and will kick the earlier trough eastward. Forcing for ascent will gradually increase Thursday night and Friday. As the second shortwave arrives, precip should spread north to the International Border. Warm cloud-layer temperatures and relatively weak lift doesn’t create high confidence in a change to all snow, so have kept mentions of freezing drizzle in the forecast during the period. A third shortwave trough and linear jet max will enter the picture for Saturday night and Sunday. Looks like a clipper-type system will move across the northern Prairies and into northern Ontario during the period. Precipitation chances in the Northland are low. In the wake of the clipper, Arctic air will surge southward and graze the Northern Plains and western Great Lakes. Temperatures are forecast to dip to near normal values for Monday and may be slightly below normal for Tuesday.

AVIATION. (For the 06Z TAFS through 06Z Wednesday night) Issued at 1143 PM CST Tue Jan 28 2020

Widespread cloud cover will continue blanketing the region tonight and tomorrow as another area of low pressure slowly moves into eastern MN. Conditions will remain mostly MVFR, with a few instances of dropping to IFR through 12Z. Widely scattered freezing drizzle and snow showers are possible until sunrise, mainly for DLH, HIB, and INL. Models are not forecasting the precipitation well, so exact timing and location are very difficult to predict. A small break in the clouds has opened around BRD, however clouds will fill back in as the night goes on. Winds will be mostly calm overnight, then become southerly after about 17Z.

PRELIMINARY POINT TEMPS/POPS. DLH 24 13 23 17 / 10 10 10 20 INL 23 11 24 14 / 10 10 10 10 BRD 24 13 24 18 / 10 10 10 20 HYR 28 11 27 19 / 10 10 10 20 ASX 27 13 27 18 / 10 10 10 20

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

SHORT TERM . JDS LONG TERM . Huyck AVIATION . KL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DULM5 - 9099064 - Duluth, MN 6 mi52 min SSW 1.9 G 1.9 22°F 1022.9 hPa20°F
PKBW3 7 mi94 min Calm 18°F 1023 hPa (+0.0)17°F

Wind History for Duluth, MN
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Duluth - Sky Harbor Airport, MN2 mi39 minN 010.00 miOvercast19°F17°F93%1023.4 hPa
Richard I. Bong Airport, WI5 mi39 minN 010.00 miOvercast18°F14°F88%1023.4 hPa
Duluth International Airport, MN13 mi39 minN 08.00 miOvercast19°F16°F88%1024.1 hPa

Link to 5 minute data for KDYT

Wind History from DYT (wind in knots)
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Last 24hrW6NW7NW8W5SW8SW7SW3W3NW4CalmCalmSE3SW3CalmCalmCalmSW3S3SW3CalmCalmCalmCalmCalm
1 day agoNW4NW8NW9NW8W6NW8NW7NW8W8NW8W6W7W7NW4NW8W5N8N7N12N7NW3NW5N7N4
2 days agoW5NW3NW5NW6W4NW4W4CalmNW3CalmN4CalmW3CalmCalmCalmCalmCalmN5CalmCalmNW4NW5NW6

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
GEOS Local Image of GreatLakes    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 (6,6,7,8)
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Ground Weather Radar Station Duluth, MN
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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.