Wednesday, April21, 2021
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Marine Weather and Tides
Cornucopia, WI

Version 3.4
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1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:07AMSunset 8:06PM Wednesday April 21, 2021 6:53 AM CDT (11:53 UTC) Moonrise 12:09PMMoonset 2:54AM Illumination 71% 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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LSZ146 Expires:202104060845;;116199 Fzus73 Kdlh 060821 Mwsdlh Marine Weather Statement National Weather Service Duluth Mn 321 Am Cdt Tue Apr 6 2021 Lsz144>146-162-060845- 321 Am Cdt Tue Apr 6 2021
.strong Thunderstorms over western lake superior... The areas affected include... 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... Two harbors to duluth mn... At 320 am cdt, doppler radar indicated strong Thunderstorms, capable of producing winds to around 30 knots, small hail, and frequent cloud to water lightning. These strong Thunderstorms were located along a line extending from near french river, to near duluth lift bridge channel, to 11 nm west of barkers island, moving east at 25 knots. Locations impacted include... Superior harbor, duluth lift bridge channel, brule point, and barkers island. Precautionary/preparedness actions... Mariners can expect wind gusts up to 33 knots...locally higher waves...cloud to water lightning strikes...small hail...and heavy downpours. Boaters should seek safe harbor until these storms pass. && lat...lon 4669 9229 4668 9224 4672 9223 4682 9210 4693 9176 4692 9112 4674 9150 4672 9157 4666 9193 4666 9203 4671 9210 4666 9211 4665 9216 4663 9220 4665 9230
LSZ146


7 Day Forecast for Marine Location Near Cornucopia, WI
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location: 46.9, -91.04     debug


Area Discussion for - Duluth, MN
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FXUS63 KDLH 211141 AFDDLH

Area Forecast Discussion National Weather Service Duluth MN 641 AM CDT Wed Apr 21 2021

DISCUSSION. (Today through Tuesday) Issued at 358 AM CDT Wed Apr 21 2021

Summary: Another round of scattered afternoon rain and snow showers will be possible today across the Northland. Tomorrow will see widespread sunshine before a chance of rain moves in on Friday and continues through the weekend. Temps gradually increase the next couple days, with highs in the low 60s on Thursday. Cooler temps move in this weekend, with highs in the 40s on both Saturday and Sunday.

A longwave trough remains positioned over the Great Lakes region this morning and is expected to be centered over Michigan today before propagating east. This trough will provide vorticity at 500mb, which is likely to lead to another round of scattered rain and snow showers this afternoon. Forcing, and therefore precip, will primarily be concentrated in the Arrowhead and northwest WI. Expect precip to initially start off as snow this morning before transitioning to rain in the afternoon. Snow accumulations are likely to be minimal. However, a couple tenths of snow are possible for portions of the CWA. Highest snow accumulations will be along and east of U.S. 63 in northwest WI, where snow amounts up to a half inch are possible this morning.

The limiting factor for snow accumulation and precip reaching the ground today will be the dry air near the surface. Model soundings show an inverted V profile extending up to 800mb across the CWA. This low level dry air will likely evaporate most of the rain and snow before it reaches the surface. Therefore, confidence in snow amounts exceeding a couple tenths of an inch this morning is low. However, there is still the chance for a pocket of heavier snow that might overcome the lack of low level moisture and overperform snowfall-wise. Therefore, slightly higher amounts up to 0.5" was kept in the forecast for portions of Iron and Price County. This amount was supported by several models, which helped increase confidence above the point of removal from the forecast. Expect rain and snow to taper off in the late afternoon, as the mixed layer deepens, the low levels further dry out, and the trough continues to move east.

This trough will exit the region tomorrow as a ridge builds over the CWA. This ridge will result in sunny skies and high temps on Thursday reaching the low 60s across much of the area. This brief reprieve from the rain and snow will be short-lived though as low pressure from Colorado moves into the Northland on Friday. This low will bring a chance for rain and snow across much of the area. Hot on the heels of Friday's low pressure will be a shortwave trough, which will keep rain and snow in the forecast on Saturday. Next week may continue the active pattern, with periodic chances for rain and snow.

AVIATION. (For the 12Z TAFS through 12Z Thursday morning) Issued at 641 AM CDT Wed Apr 21 2021

VFR conditions throughout the period. Scattered diurnal rain and snow showers are likely to develop this afternoon. However, cig and vsby reductions are not expected due to a layer of dry air near the surface. Most of the rain and snow that falls today is likely to evaporate before reaching the surface. This will greatly reduce rain/snowfall magnitude and impact this afternoon.

MARINE. Issued at 358 AM CDT Wed Apr 21 2021

Winds this morning are expected to be northwest at 5 to 10 knots. This afternoon, winds along the North Shore and in the Apostle Islands are expected to increase to 10 to 15 knots. Wind direction shifts to the southwest tonight for most zones as a ridge builds over the area. This shift to southwest winds of 10 to 15 knots will result in waves building to 1 to 3 feet along the North Shore. Higher waves of 2 to 4 feet will be possible on Thursday from Taconite Harbor to Grand Portage. In addition, the outer Apostle Islands also have the potential to see these 2-4 foot waves. Elsewhere, waves are expected to remain at 2 feet or less today and tomorrow.

PRELIMINARY POINT TEMPS/POPS. DLH 40 29 59 37 / 20 0 0 0 INL 44 28 62 35 / 0 0 0 0 BRD 43 30 61 38 / 0 0 0 10 HYR 42 26 60 35 / 20 0 0 0 ASX 42 28 60 37 / 10 0 0 0

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

DISCUSSION . Unruh/BJH AVIATION . Unruh/BJH MARINE . Unruh/BJH


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PNGW3 - Port Wing, WI 20 mi74 min S 4.1 G 5.1 29°F 1019.3 hPa
DISW3 - Devils Island, WI 21 mi54 min S 1.9 G 2.9 29°F 1020.3 hPa (+0.0)28°F
SLVM5 - Silver Bay, MN 29 mi74 min WNW 5.1 G 8 30°F 1019.3 hPa
SXHW3 - Saxon Harbor, WI 40 mi74 min S 4.1 G 5.1 29°F 1019 hPa

Wind History for Duluth, MN
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
John F Kennedy Memorial Airport, WI25 mi61 minWSW 31.50 miLight Snow Fog/Mist28°F26°F92%1020.7 hPa

Link to 5 minute data for KASX

Wind History from ASX (wind in knots)
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Last 24hrW4NE8NE4E5NE10NE10
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E8N9NE7NE6NE7NE5NE5E5CalmCalmCalmCalmCalmCalmW4SW3SW5W3
1 day agoNW8N7NW12
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2 days agoS4SW7SW6W7SW10
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Tide / Current Tables for
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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