Tuesday, October20, 2020
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L-36.com

Marine Weather and Tides
Roosevelt Park, MI

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 8:04AMSunset 6:55PM Tuesday October 20, 2020 10:37 AM EDT (14:37 UTC) Moonrise 11:48AMMoonset 8:54PM Illumination 15% Phase: Waxing Crescent; Moon at 4 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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LMZ847 Grand Haven To Whitehall Mi- 805 Am Edt Tue Oct 20 2020
Today..East winds 10 to 20 knots. Mostly cloudy. A slight chance of rain showers in the afternoon. Waves around 1 foot.
Tonight..Southeast winds 15 to 20 knots veering south late at night, then veering west 20 to 25 knots toward daybreak. Rain showers. Waves 1 to 3 feet building to 3 to 5 feet toward daybreak.
Wednesday..West winds 15 to 25 knots decreasing to 10 to 15 knots late in the day. Mostly cloudy. Waves 4 to 6 feet.
Wednesday night..West winds 5 to 10 knots veering northeast late at night, then veering east 10 to 15 knots toward daybreak. Rain showers. Waves 1 to 3 feet.
Thursday..Southeast winds 15 to 20 knots. Rain showers likely. Waves 2 to 3 feet.
Friday..Southwest winds 20 to 25 knots veering northwest. Rain showers likely and a chance of Thunderstorms. Waves 6 to 8 feet.
Saturday..North winds 10 to 15 knots. Partly Sunny. Waves 2 to 3 feet.
LMZ847 Expires:202010202000;;794123 FZUS53 KGRR 201205 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 805 AM EDT Tue Oct 20 2020 For waters within five nautical miles of shore on Lake Michigan LMZ847-202000-


7 Day Forecast for Marine Location Near Roosevelt Park, MI
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location: 43.22, -86.36     debug


Area Discussion for - Grand Rapids, MI
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FXUS63 KGRR 201140 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 740 AM EDT Tue Oct 20 2020

LATEST UPDATE . Aviation

SYNOPSIS. Issued at 311 AM EDT Tue Oct 20 2020

- Low Pressure System to Bring Rain Tonight into Wednesday

- Warm Front Precipitation Wednesday Night into Thursday

- Cold Front Expected Friday into Friday Night With Some storms Possible

DISCUSSION. (Today through next Monday) Issued at 311 AM EDT Tue Oct 20 2020

- Low Pressure System to Bring Rain Tonight into Wednesday -

Our active pattern will continue into tonight as a low pressure system moves in our direction tonight into tomorrow. Similar to what weve seen the last day or so, models continue to push that heavier swath of rain south of our area, and that trend still stands this morning. All areas will likely see some light rain, but a washout is not expected. As some instability moves in from the south later tonight, it will also be possible that we may hear some rumbles of thunder, particularly along and south of I-94. Dry air will move back in Wednesday morning, bringing dry conditions for the rest of the morning and into the evening.

- Warm Front Precipitation Wednesday Night into Thursday -

Dry conditions dont stick around long as another system moves in our direction packing two opportunities for rain the second half of the week, the first arriving late Wednesday into early Thursday as a warm front lifts north. This front will bring showers north through lower MI through Thursday afternoon, and doesnt look to pack much of a threat for thunder.

Following the passage of this front temperatures will rebound and warm into the mid to upper 60s, possibly nearing 70 for Thursday and Friday as far north as I-96.

- Cold Front Expected Friday into Friday Night With Some Storms Possible -

As that system continues to traverse through the northern Great Lakes, a cold front will sweep through the state, bringing its second opportunity for rain for our area Friday into Friday night. We may need to watch this front a little closer as storms will be likely due to ample instability ahead of the front. MUCAPE values are still pushing into the 1000 J/kg range, so stronger storms are not out of question.

AVIATION. (For the 12Z TAFS through 12Z Wednesday morning) Issued at 735 AM EDT Tue Oct 20 2020

Local MVFR fog/low clouds may be around to start the day but they are not forecasted to last past 14z. Most of the day will be VFR as high pressure moves in. A system moves in from the southwest tonight bringing low clouds and temporary visibility restrictions. Conditions should trend to MVFR and then IFR overnight. A local thunderstorm is possible . confidence is highest for KJXN so I put VCTS in for that site. Low level wind shear could be an issue as well tonight . especially to the south and east of KGRR.


MARINE. Issued at 311 AM EDT Tue Oct 20 2020

Quiet conditions will continue on Lake Michigan into this evening before winds pick up tonight into Wednesday. Winds will start off southeasterly before shifting to the southwest by early tomorrow morning. Wave heights will reach near 3 feet by Wednesday morning. The next time frame to monitor will be Thursday night into Friday as southerly winds build due to strong warm air advection.

GRR WATCHES/WARNINGS/ADVISORIES. MI . None. LM . None.

SYNOPSIS . Thielke DISCUSSION . Thielke AVIATION . MJS MARINE . Thielke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MKGM4 - Muskegon, MI 1 mi27 min ESE 4.1 G 6 41°F 1028.2 hPa31°F
45161 2 mi37 min 7.8 G 12 42°F 56°F1 ft1026.6 hPa (+1.8)
HLNM4 - 9087031 - Holland, MI 32 mi49 min ENE 2.9 G 8.9 42°F 54°F1026 hPa37°F
LDTM4 - 9087023 - Ludington, MI 50 mi49 min E 4.1 G 5.1

Wind History for Holland, MI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muskegon, Muskegon County Airport, MI6 mi42 minENE 410.00 miOvercast43°F34°F71%1027.3 hPa

Link to 5 minute data for KMKG

Wind History from MKG (wind in knots)
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Last 24hrSE74E5CalmCalm4NW5CalmN4N6N6N7N6NE6N4N4NE4N5N6NE5E4E4NE4E4
1 day agoN15
G20
NW12N7NW11NW8NE3CalmNW5N6N4CalmCalmCalmCalmCalmCalmCalmCalm------------
2 days agoSE9S10
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W12NW4NW13

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
Ground Weather Radar Station Grand Rapids/Muskegon, MI
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weather_mapweather_map weather_map


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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.