Saturday, December14, 2019
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Marine Weather and Tides
Two Harbors, MN

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:43AMSunset 4:22PM Saturday December 14, 2019 6:28 AM CST (12:28 UTC) Moonrise 6:53PMMoonset 10:02AM Illumination 92% Phase: Waning Gibbous; Moon at 17 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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LSZ144 /o.can.kdlh.ma.w.0030.000000t0000z-191001t0215z/ 906 Pm Cdt Mon Sep 30 2019
.the special marine warning is cancelled... The affected areas were... Two harbors to duluth mn... 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 0205z 265deg 44kt 4677 9135
LSZ144 Expires:201910010215;;023968 FZUS73 KDLH 010206 MWSDLH Marine Weather Statement National Weather Service Duluth MN 906 PM CDT Mon Sep 30 2019 LSZ144-010215-


7 Day Forecast for Marine Location Near Two Harbors, MN
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location: 47.03, -91.67     debug


Area Discussion for - Duluth, MN
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FXUS63 KDLH 141153 AFDDLH

Area Forecast Discussion National Weather Service Duluth MN 553 AM CST Sat Dec 14 2019

UPDATE. Issued at 552 AM CST Sat Dec 14 2019

Snow is persisting longer over the Arrowhead this morning as a low level convergence zone along and east of the inverted trough axis, and the upper level shortwave moving more slowly across the area than models have depicted. Some locations are observing visibilities in the 1 to 3 mile range as far west as Crane Lake and Hibbing. Snowfall reports from overnight do not support extending the Winter Storm Warning, but have decided to just extend the Winter Weather Advisory into both the lakeshore zones and until noon today to allow the snow to fully taper off to flurries.

UPDATE Issued at 540 AM CST Sat Dec 14 2019

Updated below for 12z Aviation Discussion.

SHORT TERM. (Today through Sunday) Issued at 351 AM CST Sat Dec 14 2019

A weak low pressure system that has moved across the Upper Midwest on Friday and Friday night is now over eastern Lake Superior/upper Michigan. An inverted trough extends west to lie across the Minnesota Arrowhead. Snow is ongoing within the trough axis, with just enough onshore component for the very tip of the Arrowhead to detect some lake enhancement to the snowfall. Higher in the atmosphere there is a shortwave that is in the process of moving across the Arrowhead as well, and this is all serving to maintain the snowfall this morning over the area. Over the next 3 to 6 hours the upper level shortwave will begin to move away again, and the surface inverted trough is expected to weaken, which should allows the snowfall to rapidly diminish over northeast Minnesota this morning. For now we have the Winter Weather Advisory and Warning expiring at 12z, which for now appears reasonable, though we will have to re-evaluate visibility trends and the latest snowfall reports closer to expiration time to make any determinations about extending or not. With the inverted trough sliding southeast, the lake effects shift to the South Shore this morning, with perhaps some actual banding setting up by mid morning. These may produce some periods of heavier snowfall rate along the south shore, which after they set up around mid morning, should continue through the day and into this evening before diminishing/shifting east overnight. In the meantime, the rest of the area should experience clearing skies today, and enough cold air advection to keep temperatures from rising very far today, and then dropping rather dramatically tonight as a ridge of high pressure builds in. Have made the overnight min temperature forecast for tonight on the cold end of guidance, though if we get light enough winds in here, it could be colder yet than what I have put in. Currently, I have forecast mins in the teens below zero over much of northern Minnesota, with single digits near and below zero for most of Wisconsin. The high pressure ridge will also keep temperatures on the cold side for Sunday, with highs only in the single digits above zero.

LONG TERM. (Sunday night through Friday) Issued at 351 AM CST Sat Dec 14 2019

Fairly quiet conditions are expected for the extended with no major system on the horizon. There may be a few chances for light snow, but a lack of moisture will keep these chances in check. Temperatures will start the period below normal before warming near to above normal for late next week and into the weekend.

High pressure will shift to the southeast Sunday night as a shortwave trough moves into the region and passes through Monday morning. This may squeeze out a little snow through the Borderlands, but with little in the way of moisture to work with, it appears to be a dry passage for most. However, there could be some lake effect snows across the south Shore of Lake Superior with persistent northwest winds and decent lake effect signals in the GFS/ECMWF/GEM/NAM. A stronger shortwave and upper low will dive southeast out of Canada and into the northern Great Lakes for Tuesday into Wednesday. A lack of moisture again looks to be the limiting factor for more widespread snowfall and only the GFS bring measurable QPF through the region with the system. A reinforcing shot of cold air will arrive behind this system for Tuesday night into Wednesday and will keep below normal temperatures in place along with chances for lake effect across the South Shore of Lake Superior.

Another subtle shortwave embedded in the northwest flow aloft will then pass by the Northland Wednesday night. While it appears there will be a bit more moisture for this system to work with, the bulk of the QPF looks to pass to our north and east and keep the Northland mainly dry outside of snow showers across the Arrowhead. Ridging aloft then starts to build in for Thursday into Friday as warm air advection brings near to above normal temperatures to the region. With normal temperatures this time of year in the lower half of the 20s, temperatures will still be below freezing for both Thursday and Friday. Overall forecast confidence takes a nose dive for Friday into the weekend with major model differences in place. The GFS and GEM move an upper low through the region with that feature practically non-existent on the ECMWF. Keeping light snow chances in for this period, but could very well end up dry.

AVIATION. (For the 12Z TAFS through 12Z Sunday morning) Issued at 540 AM CST Sat Dec 14 2019

MVFR and IFR conditions are seen around the terminals this morning aside from KINL which is VFR and should see mainly clear skies push in shortly. Light snow showers linger across the region this morning but are expected to move east of the terminals by mid to late morning. Ceilings will slowly rise to MVFR and then VFR by this afternoon, although KHYR may remain in the MVFR into this evening. Anthropogenic snows are currently seen at KHIB and are leading to IFR visibilities. Winds are expected to shift slightly by mid-morning and move this band of snow away from terminal. Winds will be gusty today from the northwest at 5 to 15 knots with gusts to 20 to 25 knots through this afternoon.

MARINE. Issued at 351 AM CST Sat Dec 14 2019

Winds will become northwesterly this morning in response to low pressure to the east and high pressure to the west setting up a tight pressure gradient. Wind speeds will increase to 10 to 15 knots with gusts to 20 to 25 knots, highest along the Bayfield Peninsula to Saxon Harbor this afternoon and evening. Waves will also increase to 3 to 5 feet near Saxon Harbor this afternoon with most areas remaining around 2 feet or less. A Small Craft Advisory has been issued from Port Wing to Saxon Harbor for this afternoon and evening. Winds will then diminish tonight to 6 to 12 knots and become southwesterly Sunday and Sunday night at 5 to 15 knots as high pressure passes to the south. Waves will be around 2 feet or less for Sunday and Sunday night.

PRELIMINARY POINT TEMPS/POPS. DLH 12 -11 4 -3 / 30 0 0 0 INL 6 -16 6 -2 / 10 0 10 10 BRD 8 -19 4 -3 / 0 0 0 0 HYR 17 -9 8 -3 / 30 10 0 0 ASX 21 1 10 1 / 80 70 10 0

DLH WATCHES/WARNINGS/ADVISORIES. WI . Winter Weather Advisory until 6 AM CST Sunday for WIZ004.

MN . Winter Weather Advisory until noon CST today for MNZ011-012-020- 021.

LS . Small Craft Advisory from noon today to midnight CST tonight for LSZ146>148.



UPDATE . LE SHORT TERM . LE LONG TERM . BJH AVIATION . BJH MARINE . BJH


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DULM5 - 9099064 - Duluth, MN 28 mi64 min WNW 8 G 12 21°F 1008.4 hPa14°F
PKBW3 35 mi148 min Calm 18°F 1010 hPa (+0.0)16°F

Wind History for Duluth, MN
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Two Harbors, MN4 mi33 minNNW 6 G 1710.00 miOvercast19°F8°F63%1006.4 hPa
Silver Bay, MN19 mi33 minNW 510.00 miOvercast19°F12°F73%1006.1 hPa

Link to 5 minute data for KTWM

Wind History from TWM (wind in knots)
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Last 24hrSE3CalmCalmSE4S3S5S3CalmCalmCalmS3SW3SW4SW3CalmCalmW3NW3W4W3NW5NW5NW9NW7
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1 day agoCalmCalmNE3NE5E8NE8NE8
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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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Duluth, MN (7,2,3,4)
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Ground Weather Radar Station Duluth, MN
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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 numerious 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.