Sunday, January21, 2018 L-36.com


Marine Weather and Tides
Fennville, MI

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 8:06AMSunset 5:45PM Sunday January 21, 2018 7:57 AM EST (12:57 UTC) Moonrise 10:40AMMoonset 10:23PM Illumination 23% Phase: Waxing Crescent; Moon at 5 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- 1107 Pm Est Mon Jan 15 2018
Rest of tonight..Southwest winds 10 to 20 knots backing southeast toward daybreak. Snow. Waves 1 to 3 feet.
Tuesday..East winds around 5 knots backing west, then veering north late in the day. Cloudy with a chance of snow showers. Waves calm.
Tuesday night..North winds 5 to 15 knots backing west 10 to 20 knots toward daybreak. Snow showers likely in the evening, then a chance of snow showers overnight. Waves calm.
Wednesday..West winds to 30 knots backing southwest gales to 35 knots late in the day. Partly Sunny. A slight chance of snow showers until midday. Waves calm. Waves are for ice free areas. This is the last nearshore marine forecast (nshgrr) issuance for the season. The nshgrr will again be issued around april 1st 2018, or as conditions warrant.
LMZ845 Expires:201801161015;;514453 FZUS53 KGRR 160407 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 1107 PM EST Mon Jan 15 2018 For waters within five nautical miles of shore on Lake Michigan LMZ845-161015-

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 211142
afdgrr
area forecast discussion
national weather service grand rapids mi
642 am est Sun jan 21 2018
latest update...

aviation

Synopsis
Issued at 317 am est Sun jan 21 2018
low pressure will track through lower michigan on Monday and
Tuesday bringing rain on Monday which will change to snow by
Tuesday. Snow showers can be expected on Wednesday as colder air
returns.

Short term (today through Tuesday)
issued at 317 am est Sun jan 21 2018
forecast challenges are for extent of fog tonight and potential
for some freezing rain across the northern zones into early Monday.

There is also the timing of the changeover to snow Monday night
and Tuesday morning. There could even be thunder across the
southern zones Monday morning.

Looks like any freezing rain tonight will be confined to the far
north where temps and dew points will be at or below freezing
until about 15z Monday. Precip during that time is not expected to
be heavy and no significant icing is forecast.

While that's happening across the northern zones, we will have to
watch the thunder potential across the south, where there will be
elevated instability and strong lift as the warm conveyer belt
pushes into this area. The heavy rain threat will be mitigated by
the quick movement of the storm, with the dry slot moving in by
Monday afternoon.

Colder air wraps around Monday night and a the deformation zone
precip changes over to snow with some light accums possible on
Tuesday.

Long term (Tuesday night through Saturday)
issued at 317 am est Sun jan 21 2018
an upper trough moving across the upper midwest will provide low
chances for light snow Tuesday night through Wednesday night. Both
the ECMWF and GFS are in decent agreement with both the track and
timing of this system.

A nice shot of upper ridging will build in behind the departing
trough and temperatures will climb into the lower to mid 30s toward
the end of the week.

Rain chances will develop late Friday and Saturday as low pressure
strengthens in the plains and then moves toward the great lakes. A
50 kt low level jet will bring abundant moisture northward toward
michigan and we should see widespread rain as a result.

Aviation (for the 12z tafs through 12z Monday morning)
issued at 641 am est Sun jan 21 2018
ifr conditions will develop today and continue into tonight as low
clouds move in from the south. Areas of lifr can be expected into
Monday morning. Winds will be southeast and east generally below
10 knots.

Hydrology
Issued at 225 pm est Sat jan 20 2018
a complete melting of the snowpack is expected Sunday Monday in
the grand, kalamazoo, and lower muskegon river basins. This will
release about a quarter to half inch of water. Rain totals on
Monday will probably range between 0.6 and 1.2 inches (ecmwf and
ensemble consistently lower than GFS and ensemble). Depth of
frozen soil varies but overall expect the ground to remain frozen
enough to allow efficient runoff.

A number of river forecast points will likely rise above bankfull
in the upcoming week. There is a chance of minor flood stage being
reached at a few sites (of earliest concern are holt and eagle),
particularly if higher rainfall totals verify. A breakup of river
ice is expected, and ice jams can cause local unpredictable
fluctuations in water levels. Road closures are possible in low
spots near river banks.

Grr watches warnings advisories
Mi... None.

Lm... None.

Synopsis... Ostuno
short term... Ostuno
long term... 04
aviation... Ostuno
hydrology... Cas


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HLNM4 - 9087031 - Holland, MI 11 mi40 min ENE 6 G 7 1015 hPa
SVNM4 - South Haven, MI 20 mi28 min SE 4.1 G 4.1 37°F
MKGM4 - Muskegon, MI 42 mi28 min SSE 6 G 8 35°F 1017 hPa35°F
SJOM4 - St. Joseph, MI 44 mi58 min SSW 1.9 G 5.1 38°F 1015.9 hPa (-1.0)

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Holland - West Michigan Regional Airport, MI7 mi65 minS 36.00 miFog/Mist37°F34°F89%1016.6 hPa
South Haven, South Haven Area Regional Airport, MI22 mi63 minN 07.00 miOvercast37°F34°F87%1015.9 hPa

Wind History from BIV (wind in knots)
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Last 24hrSW9SW10SW10SW12SW10SW12SW10SW10SW8SW7SW4SW3S5S5S6S5S5S4S6S3S3SW3SE5S3
1 day agoSW16SW13SW15SW16
G24
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SW13S10S8S9
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SW12SW13
2 days agoW18W19
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----SW18
G25
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SW13SW12SW18SW21
G26
SW16
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SW15SW14
G23
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SW14SW15SW16
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SW15SW16SW15
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G25

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of GreatLakes    EDIT
Geos

Wind Forecast for Grand Rapids, MI (7,2,3,4)
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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.