Monday, August10, 2020
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Marine Weather and Tides
Two Harbors, 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 5:59AMSunset 8:28PM Monday August 10, 2020 9:59 AM CDT (14:59 UTC) Moonrise 10:40PMMoonset 12:02PM Illumination 59% Phase: Waning Gibbous; Moon at 21 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.0020.000000t0000z-200809t1945z/ 230 Pm Cdt Sun Aug 9 2020
.the special marine warning is cancelled... The affected areas were... Duluth mn to port wing wi... Sand island to bayfield wi... Two harbors to duluth mn... The Thunderstorms have moved out of the warned area and no longer pose a significant threat to boaters. Lat...lon 4711 9153 4731 9127 4747 9098 4716 9064 4692 9131 time...mot...loc 1930z 235deg 40kt 4708 9148 4648 9090
LSZ144 Expires:202008091940;;189364 FZUS73 KDLH 091930 MWSDLH Marine Weather Statement National Weather Service Duluth MN 230 PM CDT Sun Aug 9 2020 LSZ144-145-147-091940-


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 101133 AFDDLH

Area Forecast Discussion National Weather Service Duluth MN 633 AM CDT Mon Aug 10 2020

SHORT TERM. (Today through Tuesday) Issued at 332 AM CDT Mon Aug 10 2020

A cold front was moving through the eastern edge of northeast Minnesota at 2 AM and extended from Moose Lake through Duluth to the northwest corner of Cook County. A warm front was located from northwest Pine county east northeast through northwest Wisconsin. Showers and a few thunderstorms were percolating along and behind the cold front. Temps and dew points are not affected by the passing of the front at this hour as temps are in the 60s and 70s, and dew points are in the 60s. Drier air is arriving however, as Walker, Big Fork and International Falls dew points are in the 50s.

As these fronts continue to move through the rest of the forecast area early this morning, scattered showers and a few thunderstorms are forecast. The better instability is from the Twin Ports through Pine county and east over all of northwest Wisconsin. This will be the area to see any storms. Behind the fronts, a clearing and drying trend is forecast. Good mixing later today will lower dew points and create gusty winds. Plenty of sun will allow max temps to reach into the upper 70s to lower 80s.

High pressure will be centered over southern Minnesota/northern Iowa tonight. This will leave a bit of a pressure gradient over the area, which should keep the wind from going completely calm. This will also keep the fog from forming. Minimum temps will be in the 50s, with lower 60s along the periphery of Lake Superior.

A weak frontal boundary will move over northeast Minnesota Tuesday. This will be a dry passage as mean RH is less than 45 percent. Decent mixing will occur with gusty winds expected. Max temps should reach the 80s.

LONG TERM. (Tuesday night through Sunday) Issued at 332 AM CDT Mon Aug 10 2020

Surface ridging will cover the region Tuesday night as the aforementioned high pressure drifts to eastern Wisconsin.

Model differences reveal themselves Wednesday. The GFS and GEM are suffering from convective feedback. The other models, including SREF and GEFS keep the area dry. National Blend of Models is leaning wet and will have some chance pops into Wednesday night. This is in response to some small impulses moving quickly through the region.

Thursday and Thursday night finds the surface ridging departing, allowing a warm and humid southwest flow to set up. Model differences in timing of additional impulses continue. Will keep pops to account for these differences.

A cold front will attempt to move into the area Friday and Friday night. Timing of this front is handled differently by all models, but enough evidence to support chance pops. This cold front will move through Saturday and Saturday night with showers and thunderstorms. Some activity may linger in northwest Wisconsin on Sunday before ending as high pressure arrives.

AVIATION. (For the 12Z TAFS through 12Z Tuesday morning) Issued at 633 AM CDT Mon Aug 10 2020

A cold front will move past HYR early in the forecast accompanied by showers and possibly and thunderstorm. Rain is trending downward, but will begin the forecast with a VCSH mention and MVFR cigs. Cigs and vsbys will improve to VFR by 14Z as the rain departs. Elsewhere, areas of BR/FG with LIFR/VLIFR cigs and vsbys will improve to VFR by 14Z. Gusty winds are forecast by 16Z and will continue until sunset. Some LLWS at HIB and INL will be nearby around 07Z and last until the end of this forecast.

MARINE. Issued at 332 AM CDT Mon Aug 10 2020

A southwest wind of 5 to 15 knots will affect the nearshore waters into Tuesday evening. A cold front will begin to cross Lake Superior Tuesday night and will turn the wind to the northwest along the north shore, while remaining southwest along the south shore. The wind speed will be subsiding through the night. Waves will be less than 3 feet. The exception will be along the north shore from Grand Marais to Grand Portage may approach 4 feet. Will hold off on a Small Craft Advisory for now as confidence is low.

PRELIMINARY POINT TEMPS/POPS. DLH 77 56 84 58 / 0 0 0 0 INL 77 55 81 52 / 0 0 0 0 BRD 77 56 84 59 / 0 0 0 10 HYR 78 53 84 57 / 20 0 0 0 ASX 80 56 87 59 / 20 0 0 0

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

SHORT TERM . GSF LONG TERM . GSF AVIATION . GSF MARINE . GSF


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
45028 - Western Lake Superior 17 mi39 min NW 7.8 G 7.8 69°F 69°F1 ft1012.4 hPa60°F
45027 - North of Duluth, MN 18 mi39 min NW 3.9 G 5.8 70°F 69°F1011.9 hPa56°F
PNGW3 - Port Wing, WI 22 mi79 min WSW 5.1 G 7 66°F 1012.5 hPa
SLVM5 - Silver Bay, MN 27 mi79 min WNW 8 G 9.9 67°F 1011.5 hPa
DULM5 - 9099064 - Duluth, MN 28 mi65 min 71°F 68°F1012.2 hPa55°F
PKBW3 35 mi119 min NNW 4.1 66°F 1012 hPa (-0.0)61°F

Wind History for Duluth, MN
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Silver Bay, MN19 mi2.1 hrsN 010.00 mi63°F60°F94%1010.8 hPa

Link to 5 minute data for KTWM

Wind History from TWM (wind in knots)
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Last 24hrE9SE8SE7E4SE5------------------------------------NW5
1 day agoSW6S5S4S5S6S7S7S3CalmSW6S4CalmCalmCalmCalmCalmNW3CalmCalmCalmN3CalmN3Calm
2 days agoCalmE3SE5E3SE4SE3SE3E3SE3E3CalmCalmCalmE5NW6
G21
E3SW3S8SW6SW5W10CalmW6W8

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    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 (10,2,3,4)
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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 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.