Thursday, April2, 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 6:42AMSunset 7:40PM Thursday April 2, 2020 4:33 AM CDT (09:33 UTC) Moonrise 11:48AMMoonset 2:57AM Illumination 69% Phase: Waxing Gibbous; Moon at 9 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;;024440 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 020914 AFDDLH

Area Forecast Discussion National Weather Service Duluth MN 414 AM CDT Thu Apr 2 2020

SHORT TERM. (Today through Friday) Issued at 414 AM CDT Thu Apr 2 2020

Rain was falling over portions of the Northland early this morning and was most widespread from the Brainerd Lakes north and east into Itasca and Aitkin Counties into the Iron Range. Temperatures in these areas were still above freezing but a few areas were at 33 degrees with dewpoints in the upper twenties. Some light freezing rain will be possible this morning including points further east and north toward the Arrowhead, North Shore, to the Twin Ports but it's expected to be light and road temperatures in many locations were still above freezing. All this precipitation was in response to a slow moving cold front and inverted trough along with a surge of low level warm air advection and shortwave embedded in southwest flow aloft. Rain coverage will be greatest over the next 3 to 5 hours then it's expected to decrease through the day and become focused further west closer to the front and inverted trough. All rain is expected by mid to late morning as surface temperatures warm. We increased temperatures today over southern portions of the Northland and have highs there in the fifties. The North Shore down into the Twin Ports will be the coolest with off lake winds keeping highs in the upper thirties to lower forties.

The upper level trough will move into the Northern Plains tonight giving the frontal boundary and trough a push into central Minnesota. The models are in decent agreement and we expect precipitation chances to increase from west to east tonight. Low level temperatures will cool from west to east later tonight into Friday and the rain will become freezing rain, sleet, and snow. This will occur tonight over our western area and we will issue a Winter Weather Advisory from Aitkin County north to Koochiching County and points west. Forecast soundings show the low level temperatures drop below freezing with a warm nose still in place. Eventually though the whole sounding will cool enough for snow. Snow/sleet accumulations from tonight into Friday over western areas will be from 1 to nearly 3 inches with ice accumulation of 1 to 2 tenths of an inch. There is a concern higher QPF could fall in a narrower band as strong low level FGEN is forecast. If that does occur, ice and snow/sleet amounts would need to be adjusted up. Another area of concern tonight is along the higher terrain of the North Shore where surface temperatures may drop below freezing causing freezing rain instead of rain to occur. Confidence in that occurring is low and we will not issue any headlines for the North Shore yet.

The colder air will continue east on Friday cooling all areas below freezing but the tip of the Arrowhead down into the Ashland, Hurley, Park Falls, and Phillips areas. The rain early will switch to freezing rain, sleet, and snow and additional Winter Weather Advisories may be needed over eastern Minnesota into far northwest Wisconsin Friday. At this time we expect less than 0.15 inches of ice and snowfall around an inch or less.

Additional QPF from this system today into Friday evening will range from around a third of an inch over north central Wisconsin to a half to one inch elsewhere. The rain and runoff from melting snow will cause rivers and streams to continue to rise.

LONG TERM. (Friday night through Wednesday) Issued at 414 AM CDT Thu Apr 2 2020

The extended looks to remain active in the precipitation department as temperatures run near to above normal.

A major system will exit the Northland Friday night with rain, snow and freezing rain remaining possible as a cold front pushes through, mainly across northwest Wisconsin. This activity will end from west to east Friday night as high pressure builds in. Saturday will feature mostly sunny and dry conditions as the high moves through. Sunday should remain dry as well as the high moves to the east, but clouds are expected to increase ahead of the next system moving into the Northern Plains. The GFS remains a touch faster with this next system as rain and snow return for Sunday night into Monday. The remainder of the new week looks active with multiple chances for precipitation, but models disagree with the timing and tracks of the individual systems. Regardless, it looks more wet than dry overall for much of the week at this time.

Temperatures will be within a few degrees of normal for Saturday before trending above normal for the remainder of the extended. Tuesday continues to look like the warmest day of the period with highs ranging from the 50s north to near 60 south with readings in the 40s near Lake Superior.

AVIATION. (For the 06Z TAFS through 06Z Thursday night) Issued at 1244 AM CDT Thu Apr 2 2020

Rainfall and a cloud deck currently around 5,000ft is over central MN and propagating east. Through the night MVFR ceilings are expected to overtake the VFR conditions that were once in place early this evening. Into the morning hours the ceilings will continue to lower to possibly IFR criteria across most of the terminals. HYR is currently the outlier of the terminals at this moment. Due to the current track of the system HYR will be mostly VFR through the period with the denser clouds being over northern MN, towards the tail end of the forecast rain and lower ceilings will encroach into the terminal. Low level wind shear is not out of the question with this system as well. There is still disagreement in terms of the strength of the winds in the lower levels however there is more agreement with the directions then before. The strongest signaling for this is going into Friday morning across the eastern half of MN and into northwest WI.

MARINE. Issued at 414 AM CDT Thu Apr 2 2020

Winds will increase again across western Lake Superior today into this afternoon as the pressure gradient tightens between departing high pressure and low pressure in the Red River Valley. Northeasterly winds of 10 to 20 knots with gusts to around 25 knots are expected near the tip of western Lake Superior and along the North Shore this afternoon and evening before diminishing late tonight. This will lead to waves to 3 to 6 feet and a Small Craft Advisory has been issued this afternoon and into tonight near the Twin Ports. An additional Small Craft Advisory may be needed for this evening and tonight along parts of the North Shore. Northeasterly winds will persist Friday morning at 10 to 20 knots with higher gusts along the North Shore before a cold front sweeps across the lake during the afternoon hours. This will turn winds around to the northwest at 5 to 15 knots with gusts to 20 knots. Waves of 2 to 5 feet may linger along parts of the North Shore ahead of the front before diminishing. Quieter conditions will then be in place for Saturday as high pressure builds into the region.

PRELIMINARY POINT TEMPS/POPS. DLH 43 36 38 19 / 30 100 100 30 INL 48 28 30 12 / 70 100 100 20 BRD 54 27 32 17 / 70 100 80 10 HYR 55 46 48 22 / 20 80 90 40 ASX 51 39 52 24 / 30 50 90 50

DLH WATCHES/WARNINGS/ADVISORIES. WI . None. MN . Winter Weather Advisory from midnight tonight to 4 PM CDT Friday for MNZ010-018-025-026-033-034.

Winter Weather Advisory from 5 AM to 4 PM CDT Friday for MNZ035- 036.

LS . Small Craft Advisory from 1 PM this afternoon to 4 AM CDT Friday for LSZ144-145.



SHORT TERM . Melde LONG TERM . BJH AVIATION . Britt MARINE . BJH


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DULM5 - 9099064 - Duluth, MN 6 mi52 min NE 6 G 8.9 37°F 1018.8 hPa33°F
PKBW3 7 mi154 min E 2.9 35°F 1019 hPa (+0.0)34°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 minNE 910.00 miMostly Cloudy36°F33°F93%1019.3 hPa
Richard I. Bong Airport, WI5 mi39 minNE 710.00 miDrizzle35°F33°F94%1019 hPa
Duluth International Airport, MN13 mi39 minESE 610.00 miLight Rain34°F30°F89%1019.6 hPa

Link to 5 minute data for KDYT

Wind History from DYT (wind in knots)
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Last 24hrE4E6SE3E4E4E8NE8NE11NE13NE19NE18NE16
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1 day agoNE10NE9NE10NE13NE15E14NE15NE14NE14NE17NE16NE14NE15NE14NE16NE16E17E14E13E12E10E8NE9E9
2 days agoN7CalmCalmCalmCalmE4NE5NE7NE7NE5NE8NE9E5E5NE4NE5E3E3CalmCalmCalmCalmCalmN7

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 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Duluth, MN (5,6,7,8)
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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.