Sunday, December15, 2019
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Marine Weather and Tides
Fennville, MI

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 8:06AMSunset 5:12PM Sunday December 15, 2019 9:13 AM EST (14:13 UTC) Moonrise 8:55PMMoonset 11:11AM Illumination 85% Phase: Waning Gibbous; Moon at 19 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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LMZ845 South Haven To Holland Mi- 405 Am Est Sun Dec 15 2019
.small craft advisory in effect until 11 am est this morning...
Early this morning..Northwest winds 20 to 25 knots. Cloudy with scattered snow showers and areas of light freezing drizzle. Waves 5 to 7 feet.
Today..Northwest winds 15 to 25 knots becoming west 5 to 15 knots. Cloudy with isolated snow showers. Waves 5 to 7 feet.
Tonight..Southwest winds 5 to 10 knots. Mostly cloudy with a slight chance of snow. Waves 1 to 3 feet.
Monday..Northeast winds 5 to 10 knots backing north late in the day. Partly Sunny. Waves 1 foot or less.
Monday night..North winds 10 to 20 knots. Mostly cloudy with a slight chance of snow. Waves 1 to 2 feet building to 2 to 4 feet toward daybreak.
Tuesday..Northwest winds 15 to 25 knots. Mostly Sunny. Waves 4 to 6 feet.
Wednesday..Northwest winds to 30 knots decreasing to 10 to 20 knots late in the day. Partly Sunny with a chance of snow showers. Waves 6 to 8 feet.
Thursday..Southwest winds 10 to 20 knots. Partly Sunny. Waves 2 to 4 feet.
LMZ845 Expires:201912152100;;812561 FZUS53 KGRR 150906 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 405 AM EST Sun Dec 15 2019 For waters within five nautical miles of shore on Lake Michigan LMZ845-152100-


7 Day Forecast for Marine Location Near Fennville, MI
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location: 42.65, -86.09     debug


Area Discussion for - Grand Rapids, MI
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FXUS63 KGRR 151118 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 618 AM EST Sun Dec 15 2019

LATEST UPDATE . Aviation

SYNOPSIS. Issued at 313 AM EST Sun Dec 15 2019

- Snow Showers Ending This Morning

- System Passes By to the South Monday into Monday Night

- Lake Effect Snow Showers and Colder Tuesday into Wednesday

- Dryer Through the Rest of the Week

DISCUSSION. (Today through next Saturday) Issued at 313 AM EST Sun Dec 15 2019

Precipitation has transitioned over to snow this morning with light accumulations already being seen on top of an icy glaze from last night's freezing drizzle. Only light snow accumulations of one inch or less are expected before snow ends by the late morning. Highest accumulations will be along and west of US-131 and north of I-96. Slick roads can be expected due light snow in addition to any residual glazing of ice from freezing drizzle last night.

For the system Monday into Monday night, model trends continue to suggest a more southerly track, yielding most of the higher snow totals well to our south and east. That being said, it is still within the realm of possibility that areas and south of I-94 may see light snow accumulation of less than an inch by Tuesday morning, particularly near the Jackson area.

By Tuesday, the flow turns northwesterly as an upper level trough digs into the Great Lakes. Favorable conditions will support lake effect snow showers Tuesday into Wednesday as 850mb temperatures drop into the negative teens and low level moisture increases. Light snowfall accumulations will be possible, leading to some travel impacts for lakeshore counties Tuesday into Wednesday morning.

Lake effect snow diminishes Wednesday afternoon, then conditions turn quiet to end the week. We will see a break in precipitation into next weekend, with more mild temperatures in the mid 30s.

AVIATION. (For the 12Z TAFS through 12Z Monday morning) Issued at 618 AM EST Sun Dec 15 2019

Snow continues this morning with only minor restrictions to visibilities at times. Otherwise MVFR ceilings continue this morning. Snow will gradually taper off by mid-day at which point ceilings will begin to open up towards VFR. Early Monday morning a system will pass by to the south bringing a slight chance for snow mainly for the southern TAF sites (AZO, BTL, JXN), but confidence in impactful weather remains low so we chose to keep it out of the TAF for now.

MARINE. Issued at 313 AM EST Sun Dec 15 2019

Hazardous small craft conditions continue this morning. High pressure will move in later today leading to improved conditions with weaker winds and lower waves. Quiet conditions will continue until Tuesday as winds turn northwesterly and build waves towards 5 to 8 feet through Wednesday.

GRR WATCHES/WARNINGS/ADVISORIES. MI . None. LM . Small Craft Advisory until 11 AM EST this morning for LMZ844>849.



SYNOPSIS . Honor DISCUSSION . Honor AVIATION . Honor MARINE . Honor


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HLNM4 - 9087031 - Holland, MI 11 mi61 min W 15 G 18 28°F 35°F1015.7 hPa22°F
SVNM4 - South Haven, MI 20 mi43 min W 14 G 19 28°F
MKGM4 - Muskegon, MI 42 mi33 min N 12 G 15 27°F 1018.1 hPa19°F
SJOM4 - St. Joseph, MI 44 mi73 min WNW 12 G 15 28°F 1017.9 hPa (+3.3)

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Holland - West Michigan Regional Airport, MI7 mi20 minWNW 86.00 miLight Snow28°F21°F75%1017.8 hPa
South Haven, South Haven Area Regional Airport, MI22 mi18 minNW 710.00 miOvercast28°F19°F72%1017.3 hPa

Link to 5 minute data for KBIV

Wind History from BIV (wind in knots)
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Last 24hrNE4CalmCalmNW3NW4NW9NW7
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1 day agoS8S7S7S6W3SW4S5CalmNW3CalmE3CalmCalmCalmCalmCalmE3CalmCalmCalmN3CalmCalmN6
2 days agoSE13SE13S12S11S17
G23
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S13S11S9S10S9S10S8SW11S9S6S6S5S4S4S6

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 Grand Rapids, MI (9,2,3,4)
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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 numerious 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.