Sunday, July12, 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 5:25AMSunset 9:02PM Sunday July 12, 2020 6:36 PM CDT (23:36 UTC) Moonrise 11:58PMMoonset 12:09PM Illumination 50% Phase: Third Quarter Moon; Moon at 22 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.con.kdlh.ma.w.0010.000000t0000z-200709t0945z/ 429 Am Cdt Thu Jul 9 2020
.a special marine warning remains in effect until 445 am cdt... For the following areas... 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... At 425 am cdt, doppler radar indicated strong Thunderstorms, capable of producing winds to 40 knots, located along a line extending from 5 nm west of port wing, to 9 nm southwest of herbster, to 21 nm east of superior harbor, moving east at 40 knots. Locations impacted include... Brule point, herbster, and bayfield peninsula sea caves. Lat...lon 4668 9183 4690 9166 4699 9152 4706 9106 4689 9100 4684 9109 4682 9118 4683 9122 4672 9160 time...mot...loc 0928z 269deg 42kt 4697 9146 4678 9146 4663 9151
LSZ145 Expires:202007090945;;562769 FZUS73 KDLH 090929 MWSDLH Marine Weather Statement National Weather Service Duluth MN 429 AM CDT Thu Jul 9 2020 LSZ145-146-162-090945-


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 122046 AFDDLH

Area Forecast Discussion National Weather Service Duluth MN 346 PM CDT Sun Jul 12 2020

SHORT TERM. (This evening through Monday night) Issued at 346 PM CDT Sun Jul 12 2020

Surface high pressure over northern Minnesota this afternoon will keep conditions fairly quiet through Monday morning. Afternoon Cu will continue to percolate over the region. The radar scope is largely free of precipitation echoes, but a few light showers may develop during the next few hours. A few areas of fog may develop tonight, mainly over northwest Wisconsin and portions of the Arrowhead.

A warm front will lift northward across northern Minnesota and northwest Wisconsin on Monday ushering in a rich moisture flow ahead of an approaching cold front. Deterministic and high-res models seem to suggest a chance for precipitation near the warm front during the morning and early afternoon. Remnant convective debris from overnight convection in northern High Plains may also help drive a few showers early in the day.

The main focus, however, will be the late afternoon hours through Tuesday morning. A surface low will move over the eastern Dakotas and lift toward northwest Ontario by Tuesday morning and will pull a cold front eastward out of the Dakotas and western Minnesota across the Northland. A moist and unstable airmass will be found over central and north-central Minnesota with PWATs over 1.7 inches and 1500 to 2000 J/kg of MLCAPE ahead of the front. Deep layer shear of 35 to 40 knots is forecast and strong 850 mb moisture transport is expected. Thunderstorms will likely develop in the eastern Dakotas and western Minnesota during the afternoon and push into central and north-central Minnesota after 5 PM. Storms should initially be discrete with supercells likely. Over time the storms will congeal into one or more lines and progress eastward. The main threat from the storms will be large hail, damaging winds, and heavy rain which may lead to localized flooding. Tornadoes cannot entirely be ruled out, but it appears the highest tornado threat will occur early in the event when storms are west of the Northland. As the storms push eastward, they will become elevated as the boundary layer decouples. Large hail, heavy rain, and damaging winds will continue to be the main threats overnight into the morning hours Tuesday.

LONG TERM. (Tuesday through Sunday) Issued at 346 PM CDT Sun Jul 12 2020

Thunderstorms will likely be ongoing Tuesday morning over portions of the Minnesota Arrowhead, I-35 corridor, and northwest Wisconsin. The cold front will still be located over central and northeast Minnesota. A few strong storms are possible during the morning. Deterministic and high-res models suggest another shortwave trough will move through the Northland during the late morning and afternoon hours. Storms may redevelop ahead of the cold front over northwest Wisconsin to near Hinckley and Pine City. Severe weather potential will likely be limited by convective debris over the area from the overnight storms. Should skies clear by late morning, sufficient destabilization will be possible to support severe storms during the afternoon. There are many caveats to the severe weather potential for Tuesday, and therefore, widespread severe weather is not anticipated at this time.

Wednesday through next Sunday will find the Northland in a progressive quasi-zonal flow pattern. There will be several chances of showers and thunderstorms during the period. Thursday afternoon and evening and Friday night through Saturday morning are the two best chances of storms as shortwave troughs propagate eastward across the Northern Plains and Upper Midwest. Temperatures Friday and Saturday will be quite warm with highs in the upper 80s and low 90s.

AVIATION. (For the 18Z TAFS through 18Z Monday afternoon) Issued at 1245 pm CDT Sun Jul 12 2020

High pressure centered over northern Minnesota this afternoon will slowly drift toward northern Lower Michigan by 18Z Monday. Look for areas of VFR ceilings and light winds through today. A few sprinkles are possible, mainly over the Arrowhead. Visibility may dip to 4 or 5 miles in showers. Given the isolated coverage, have kept any mention out of the TAF for now. Will amend if showers develop. Patchy areas of fog possible once again tonight, mainly at HYR, HIB, and BRD. Winds will turn from the south on Monday and wind speeds will increase to around 10 knots.

MARINE. Issued at 346 PM CDT Sun Jul 12 2020

High pressure remained in place over northern Minnesota will gradually drift southeastward toward Lower Michigan by Monday afternoon. With the high pressure nearby condition should be quiet over western Lake Superior today through Monday afternoon. Winds will be southerly this evening at 3 to 8 knots. An area of low pressure will develop in the western Dakotas Monday and will push northeastward into Ontario by midday Tuesday. The low will be accompanied by a cold front which will touch off thunderstorms in the Dakotas Monday afternoon. The storms will move eastward over Lake Superior Monday night and early Tuesday morning. Winds over the lake will be from the northeast ahead of the front Monday at 5 to 15 knots. The storms will bring a potential for large hail, gusty winds, and torrential rainfall. Another round of thunderstorms is forecast late Tuesday morning through the afternoon. Some of those storms may also be strong.

PRELIMINARY POINT TEMPS/POPS. DLH 57 80 62 76 / 10 10 90 60 INL 59 83 58 77 / 10 30 80 20 BRD 60 84 63 76 / 0 20 90 40 HYR 56 84 64 76 / 10 0 80 80 ASX 57 85 64 78 / 10 0 80 80

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

SHORT TERM . Huyck LONG TERM . Huyck AVIATION . Huyck MARINE . Huyck


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DULM5 - 9099064 - Duluth, MN 6 mi49 min NNE 1.9 G 2.9 76°F 64°F1013.2 hPa58°F
PKBW3 7 mi157 min SSE 1.9 77°F 1015 hPa (-1.0)56°F
PNGW3 - Port Wing, WI 34 mi57 min N 1 G 4.1 76°F 1013.5 hPa
SLVM5 - Silver Bay, MN 55 mi57 min SSW 7 G 8 67°F 1013.2 hPa

Wind History for Duluth, MN
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Duluth - Sky Harbor Airport, MN2 mi41 minE 310.00 miFair79°F59°F51%1013.5 hPa
Richard I. Bong Airport, WI5 mi42 minSE 410.00 miFair77°F57°F50%1013.5 hPa
Duluth International Airport, MN13 mi42 minSE 610.00 miPartly Cloudy74°F55°F52%1014.1 hPa

Link to 5 minute data for KDYT

Wind History from DYT (wind in knots)
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Last 24hrCalmCalmN10N7N7N8N10N9NE5NE9N6NE9NE8NE5E4NE3NE3E4E5E4E5E4E4E4
1 day agoW9NW6W5W7W6NW6W3CalmS3SW3S3S4S3CalmCalmCalmE4CalmN3E3CalmE3E3Calm
2 days agoS7SW8SW7W7W9NW7NW11
G14
W5S3SW5W6W5W8W9W4W4NW6W7W9W12W11W13W12W12

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 (19,4,5,8)
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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.