Friday, September25, 2020
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Marine Weather and Tides
Duluth, MN

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 6:58AMSunset 7:00PM Friday September 25, 2020 8:40 AM CDT (13:40 UTC) Moonrise 3:32PMMoonset 12:00AM Illumination 58% Phase: Waxing Gibbous; Moon at 8 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 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
LSZ144


7 Day Forecast for Marine Location Near Duluth, MN
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location: 46.76, -92.09     debug


Area Discussion for - Duluth, MN
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FXUS63 KDLH 251145 AFDDLH

Area Forecast Discussion National Weather Service Duluth MN 645 AM CDT Fri Sep 25 2020

SHORT TERM. (Today through Saturday) Issued at 448 AM CDT Fri Sep 25 2020

Fog blankets a good portion of the region this morning with light southeast flow. Low level warm air advection is reinforcing a capping inversion, trapping low level moisture and allowing the fog to maintain itself. Fog will be dense at times through the morning, but it will gradually lift into a low stratus deck and improve visibilities after sunrise.

An upper level trough and an attendant surface cold front will pass through from west to east this afternoon and bring shower and thunderstorm chances to most of the region. Warm air advection this morning will cap the lower atmosphere and prevent pre-frontal convection. However, diurnal heating will create plenty of afternoon instability, especially in northwest Wisconsin. With the trough/cold front providing plenty of lift to overcome the cap this afternoon, thunderstorms are likely to develop. With up to 2k J/kg of MUCAPE and favorable 0-6km shear (up to 60 kt), some strong to severe storms may result. The best chance for severe will be in northwest Wisconsin, where the best diurnal heating will meet with the passing of the front this afternoon, though northeastern Minnesota may see stronger storms as well. The SPC has outlined a slight risk of severe thunderstorms over northwest Wisconsin, with the primary threats initially being large hail, then possibly evolving into an organized linear MCS with the primary hazard evolving to damaging winds. With sfc-3km shear also fairly strong (up to ~30 kt), there is a small threat for seeing an isolated tornado as well. The front and associated storms will pass through fairly quickly this afternoon, with most CAMs suggesting that storms will exit the region by 8 PM.

Following the front, drier mid level air will move in. A low level inversion will likely keep a layer of low clouds in place, however, and bring the potential for fog to develop once again. Areas of dense fog will be possible.

The active pattern continues on Saturday as several waves of cyclonic vorticity swing through from the west. A surface low will develop over central Minnesota on Saturday with warm air advection promoting widespread cloud cover and afternoon/evening rain chances. While this rainfall will be primarily synoptically driven, there may be just enough instability to support some embedded thunder.

Temperature-wise, both today and Saturday will be fairly mild with highs in the 60s and 70s. Cloud cover on Saturday may result in high temperatures a few degrees cooler than currently forecast, however.

LONG TERM. (Saturday night through Thursday) Issued at 448 AM CDT Fri Sep 25 2020

An active pattern with several cold fronts and upper level troughs will result in successive rain chances and gradually cooling temperatures in the long term.

After a break in the action late Saturday night into Sunday morning, a cold front will pass through during the day Sunday and bring more shower chances. Northwesterly flow will develop with cold air advection on Monday, with an upper level trough bringing shower chances, most likely during the afternoon with support from diurnal heating.

A more potent upper level trough and cold front will swing through on Tuesday, bringing more widespread rain chances. The coldest air will arrive Wednesday and linger through the end of the week. While there is some model discrepancy, most long-range models suggest 850-mb temperatures below freezing. This will yield surface highs in the 40s to low 50s with nighttime lows around freezing. With a broad upper level trough cycling waves of cyclonic vorticity through the region, shower chances will remain. There could be some lake-effect or lake-enhanced rain along the south shore, and even the possibility for a bit of mixed precipitation.

AVIATION. (For the 12Z TAFS through 12Z Saturday morning) Issued at 644 AM CDT Fri Sep 25 2020

IFR visibilities will persist for the next couple hours at DLH/HIB with gradual improvement to VFR later in the morning. HYR/BRD may also see MVFR visibilities in the next couple hours due to fog, but the general trend will be for improvement. A shortwave and cold front will pass through today from west to east, bringing showers and thunderstorms mainly to HIB/INL and possibly DLH/HYR. Showers and storms could affect INL as early as 14Z. Brief visibility restrictions to MVFR/IFR and brief LLWS are possible as storms pass over the terminals today. LLWS may be present due to a strengthening low level jet at HYR for a few hours mid-day today. Winds will gradually shift from southerly this morning to westerly this evening after the front passes. A low level inversion this evening and tonight will likely result in IFR ceilings and fog at all terminals.

MARINE. Issued at 448 AM CDT Fri Sep 25 2020

East to northeasterly winds around or less than 10 kt will continue today. A cold front will pass through this afternoon, bringing chances for showers and thunderstorms. A few storms may be severe with large hail, gusty winds, and cloud-to-water lightning. Winds will become westerly tonight, but will remain light. Another weather system will move in Saturday, switching winds to northeasterly. There could be some occasional wind gusts to 15 kt Saturday afternoon, along with rain chances and a slight chance for thunder. Wave heights will be less than 2 ft in the next 48 hours.

PRELIMINARY POINT TEMPS/POPS. DLH 67 50 66 48 / 70 10 40 40 INL 66 47 65 45 / 70 10 50 50 BRD 72 51 69 48 / 10 10 20 10 HYR 76 51 70 49 / 50 20 50 40 ASX 75 51 70 49 / 60 50 40 50

DLH WATCHES/WARNINGS/ADVISORIES. WI . Dense Fog Advisory until 8 AM CDT this morning for WIZ001>003- 006>009.

MN . Dense Fog Advisory until 8 AM CDT this morning for MNZ019- 035>038.

LS . None.

SHORT TERM . JDS LONG TERM . JDS AVIATION . JDS MARINE . JDS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DULM5 - 9099064 - Duluth, MN 1 mi52 min NE 6 G 8.9 51°F 58°F1009.5 hPa50°F
45027 - North of Duluth, MN 11 mi180 min ENE 14 G 16 50°F 54°F1010.3 hPa50°F
45028 - Western Lake Superior 14 mi40 min ENE 12 G 12 51°F 52°F3 ft1010.1 hPa (-0.5)51°F
PNGW3 - Port Wing, WI 37 mi60 min ENE 4.1 G 5.1 47°F 1009.8 hPa
SLVM5 - Silver Bay, MN 56 mi60 min NE 4.1 G 8 50°F 1010.5 hPa

Wind History for Duluth, MN
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Duluth - Sky Harbor Airport, MN4 mi45 minENE 50.75 miFog/Mist52°F50°F94%1010.2 hPa
Richard I. Bong Airport, WI5 mi45 minENE 40.75 miFog/Mist51°F50°F99%1009.5 hPa
Duluth International Airport, MN7 mi45 minESE 30.25 miLight Drizzle Fog52°F51°F97%1010.3 hPa
Cloquet Carlton County Airport, MN22 mi45 minE 30.15 miFog52°F50°F94%1009.5 hPa

Link to 5 minute data for KDYT

Wind History from DYT (wind in knots)
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NE16NE15NE16NE11NE14NE16NE11NE9NE7NE9NE10E6E5E7NE8NE4NE5NE6
1 day agoCalmSW5E4NE7NE3CalmCalmCalmE3SE4CalmNE3SW10NE22NE15NE21NE19
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2 days agoS3CalmCalmNE3N5E3E6CalmNE5CalmCalmCalmCalmCalmCalmCalmSW3CalmCalmCalmCalmCalmSW4SW4

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Duluth, MN
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