Saturday, January23, 2021
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Marine Weather and Tides
Superior, WI

Version 3.4
NOTICE
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 7:40AMSunset 5:00PM Saturday January 23, 2021 11:56 AM CST (17:56 UTC) Moonrise 12:40PMMoonset 3:16AM Illumination 79% Phase: Waxing Gibbous; Moon at 10 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 Expires:202009030600;;239500 Fzus73 Kdlh 030501 Mwsdlh Marine Weather Statement National Weather Service Duluth Mn 1201 Am Cdt Thu Sep 3 2020 Lsz141>145-162-030600- 1201 Am Cdt Thu Sep 3 2020
.an area of Thunderstorms approaching western lake superior... The areas affected include... Duluth mn to port wing wi... Grand marais to taconite harbor mn... Lake superior west of a line from saxon harbor wi to grand portage mn beyond 5nm... Silver bay harbor to two harbors mn... Taconite harbor to silver bay harbor mn... Two harbors to duluth mn... At 1159 pm cdt, doppler radar indicated an area of Thunderstorms, capable of producing winds to around 30 knots. This area of Thunderstorms was located along a line extending from far northern st. Louis county southwest to around grand rapids, moving east at 50 knots. The area of Thunderstorms will approach the nearshore waters of the north shore of lake superior, including the duluth and superior harbor between 1 and 130 am cdt. Precautionary/preparedness actions... This area of Thunderstorms will likely produce winds up to 33 knots...and could pose a serious hazard for boaters. A special marine warning may eventually be required. Boaters should consider heading for shore before this storm arrives. && lat...lon 4668 9224 4681 9211 4714 9150 4758 9088 4773 9055 4777 9038 4669 9173 4666 9193 4666 9203 4671 9210 4665 9212 4668 9230
LSZ145


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 231134 AFDDLH

Area Forecast Discussion National Weather Service Duluth MN 534 AM CST Sat Jan 23 2021

DISCUSSION. (Today through Friday) Issued at 323 AM CST Sat Jan 23 2021

Snow will develop across the Northland later this afternoon into tonight. For most areas, the accumulating snow will occur tonight. A prolonged period of lake effect snow will be possible Sunday through much of next week with areas from the Twin Ports and the North Shore getting in on the chances as well.

Widespread clouds and areas of flurries were occurring across the region this morning. Cold air was still in place, despite warm air advection, making it relatively easy to produce the flurries. A weak shortwave was also moving across far northern Minnesota. The shortwave will move east by 15Z with warm air advection continuing. Low level winds will become southerly today and we expect some lake effect snow to develop along portions of the North Shore, mainly along southern Cook County. The snow there today should be light but accumulations around an inch will be possible by early evening. Snow elsewhere will take longer to develop but it should arrive in our southwest area later this afternoon with snow becoming widespread tonight across all areas. An elongated area of low pressure with centers north of the International Border and well south will aid in producing lift along with the warm air advection and an upper trough. We decreased the QPF slightly with this update but the general forecast remains on track. Forecast soundings have warmed slightly with less of the lower to mid moist layer in the max dendritic growth zone compared to 24 hours ago. This gives lower confidence in the higher snow totals. We have amounts from 1 to 4 inches across the Northland with slightly higher amounts in southern Cook County due to lake processes. We issued a Winter Weather Advisory for southern Cook County but left the rest of the area out for now. The other area that will have to be watched for a possible advisory is from Pine County east through Price County. However, confidence in amounts exceeding 3 inches is not very high.

The snow will diminish from west to east late tonight into Sunday morning. By afternoon, little snowfall is expected.

High pressure will build into the region Sunday night and temperatures are expected to drop well below zero over northern Minnesota. The high will be north of the International Border and will cause a prolonged period of east/northeast low level winds Monday into much of next week. 850MB temperatures will be from -9C to -12C through the week and lake effect snow will be possible from the South Shore to the Twin Ports and North Shore. Lake effect snow chances will be confined to the South Shore Sunday and Sunday night but accumulation will be limited by dry air. Snow accumulations will be possible through the week due to the persistent onshore flow, including in the Twin Ports and North Shore. Some limiting factors will be low level anti-cyclonic flow, dry air at times, and lack of upper support. However, favorable delta-T values and a long fetch will support at least some accumulation. The GFS and NAM for what it's worth are not very bullish on QPF but that's not too surprising given their resolution. Once we get into the window where the higher resolution models are available we will gain confidence on snow amounts. Most other areas further inland will see little precipitation through the week.

Temperatures today will be rise to 20 to 25 then cool Sunday into Monday, especially over northern Minnesota. Temperatures will then moderate through the week reaching the mid twenties to lower thirties by Friday.

AVIATION. (For the 12Z TAFS through 12Z Sunday morning) Issued at 534 AM CST Sat Jan 23 2021

MVFR or low VFR ceilings covered the Northland early this morning with flurries or areas of light snow. The snow will drop the visibility to 2 to 6 miles at times, mainly this morning. Ceilings may improve for a time today but persistent warm air advection and an area of low pressure will cause ceilings to lower again later this afternoon into tonight. Light to moderate snow will also increase again late today into tonight. Most areas will see snowfall amounts from 1 to 3 inches with higher amounts possible along portions of the North Shore and from around Hinckley toward Phillips and Park Falls. IFR conditions will be likely for a time tonight as the area of snow moves through the region.

PRELIMINARY POINT TEMPS/POPS. DLH 22 13 19 -2 / 20 100 10 0 INL 24 2 9 -12 / 20 100 20 0 BRD 23 9 17 -3 / 80 100 0 0 HYR 21 14 23 1 / 30 100 20 0 ASX 24 15 25 4 / 10 90 30 10

DLH WATCHES/WARNINGS/ADVISORIES. WI . None. MN . Winter Weather Advisory from 3 PM this afternoon to 8 AM CST Sunday for MNZ021.

LS . None.

DISCUSSION . Melde AVIATION . Melde


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DULM5 - 9099064 - Duluth, MN 6 mi69 min SW 11 G 15 20°F 1023.1 hPa12°F
PKBW3 7 mi117 min SW 5.1 18°F 1024 hPa (+0.0)11°F
PNGW3 - Port Wing, WI 34 mi77 min S 8 G 11 18°F 1023.7 hPa
SLVM5 - Silver Bay, MN 55 mi77 min WSW 12 G 14 20°F 1023 hPa

Wind History for Duluth, MN
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Duluth - Sky Harbor Airport, MN2 mi62 minSW 14 G 1710.00 miOvercast19°F10°F68%1023.7 hPa
Richard I. Bong Airport, WI5 mi62 minSW 1010.00 miOvercast20°F11°F68%1023.7 hPa
Duluth International Airport, MN13 mi62 minSSW 15 G 219.00 miLight Snow17°F10°F74%1024.1 hPa

Link to 5 minute data for KDYT

Wind History from DYT (wind in knots)
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Last 24hrSW10SW10SW11SW10SW9SW8SW8SW8SW6SW7SW6SW7SW7SW8SW8SW7SW7SW6SW6SW6SW8SW7SW10SW12
1 day agoNW24
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NW9NW8NW4W4W5W4SW3W6NW9W6NW6SW4SW8SW8
2 days agoSW16
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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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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.
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Ground Weather Radar Station




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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.