Saturday, February24, 2018 L-36.com


Marine Weather and Tides
Whitehall, 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 7:26AMSunset 6:29PM Saturday February 24, 2018 5:18 AM EST (10:18 UTC) Moonrise 12:47PMMoonset 2:54AM Illumination 67% 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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LMZ847 Grand Haven To Whitehall Mi- 1107 Pm Est Mon Jan 15 2018
Rest of tonight..Northeast winds around 10 knots. Mostly cloudy with a chance of snow. Waves 1 foot or less.
Tuesday..Northeast winds 5 to 10 knots backing north 10 to 20 knots late in the day. Mostly cloudy with a chance of snow showers. Waves around 1 foot.
Tuesday night..North winds 10 to 20 knots backing northwest 15 to 25 knots after midnight. Snow showers likely in the evening, then a chance of snow showers overnight. Waves 2 to 3 feet.
Wednesday..West winds to 30 knots. Partly Sunny. A slight chance of snow showers until midday. Waves 3 to 5 feet building to 5 to 7 feet late in the day. 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.
LMZ847 Expires:201801161015;;514451 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 LMZ847-161015-

7 Day Forecast for Marine Location Near Whitehall, MI
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location: 43.39, -86.34     debug


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 240858 cca
afdgrr
area forecast discussion... Corrected
national weather service grand rapids mi
358 am est Sat feb 24 2018
latest update...

synopsis short term long term

Synopsis
Issued at 328 am est Sat feb 24 2018
our next rain event moves through the area tonight with a few
isolated thunderstorms, the heaviest rainfall misses us to the
south and northwest. Enough cold air follows this system so that
we may see some flurries or sprinkles during the mid morning hours
of Sunday then skies should clear by mid afternoon. Mostly sunny
and warmer than normal conditions are expected Monday into
Tuesday. A weak cold front may bring showers later Tuesday into
Wednesday. Then a system from the southern plains moves into the
area to bring more rain, later Wednesday into Thursday. This may
be enough to cause more flooding issues.

Short term (today through Monday)
issued at 328 am est Sat feb 24 2018
the main issue with this forecast is the rain and possible
thunderstorms tonight. However is has become very clear the
heaviest precipitation amounts will be northwest and southeast of
this area. The system does go negative tilt at upper levels over
us tonight but the air cold enough for snow is well to our north
and west and the deep tropical moisture feed misses us to the
southeast. The instability is marginal but we can not rule out an
isolated thunderstorm this evening.

The reason the heaviest precipitation misses southwest michigan is
that the upper low that develops will be north of lake superior
so that keeps the precipitation with the upper low mostly north
and west of this area. As for why the heavy rain south of this
area, that is due to the upper jet core tracking across the
detroit area Sunday morning. That puts southwest michigan in the
left exit region of the upper jet after midnight, which is why we
get any precipitation at all from this but the right entrance
region stays south of i-80 so that will be where the heaviest rain
and significant thunderstorms will be.

More than likely there will be a brief period of freezing rain
north and east of grand rapids tonight as the showers move in but
due to the light amount of rainfall expected and that temperatures
have been for the most part above freezing plus even in areas that
get freezing rain temperatures will be just near 32 so any ice
accumulation will be very limited.

Colder air follows this system so we may see a brief period of
flurries or sprinkles mid morning Sunday then the dry air surges
in and skies should clear. High pressure rules then into Monday.

Long term (Monday night through Friday)
issued at 328 am est Sat feb 24 2018
rain chances will increase Tuesday night when a weak cold front
moves south across the state. Little in the way of upper support is
noted with the front so rain will be light and may mix with wet snow
by Wednesday morning north of i-96.

The best chance of precipitation will be Wednesday night through
Thursday night. The ECMWF and GFS are at odds on the strength of the
system. The GFS is 20mb deeper with the low than the ECMWF and
consequently develops much more rain. Latest GFS paints 1-2 inches
of rain over the CWA with the higher amounts over the east central
cwa. We'll watch this closely especially in light of the ongoing
flooding across the cwa. The ECMWF only created around a quarter
inch. The discrepancies can be traced to the different upper
dynamics. The GFS shows a much more robust low than the ECMWF which
shows a weaker trough farther north.

Once the system GOES by, colder air will filter in again and
lingering pcpn may change to light snow.

Warmer weather is again on the way with highs in the mid 50s Tuesday
and Wednesday. Otherwise, highs in the 40s can be expected.

Aviation (for the 06z tafs through 06z Saturday night)
issued at 1205 am est Sat feb 24 2018
MVFR conditions are expected at the TAF sites, except jxn where
cigs around 900 ft will prevail through 12z. Low pressure moving
toward the state will spread rain over the southern TAF sites
after 00z and vsbys will fall to less than 3sm br.

Hydrology
Issued at 328 pm est Fri feb 23 2018
levels along the grand, thornapple, and kalamazoo rivers have
crested in upriver locations and will crest over the next couple
days downriver. Many river forecast points in these basins are
seeing river levels that challenge modern records over the last 5 to
50 years. Moderate to major flooding is ongoing in the most flood-
prone locations. In kalamazoo this is a record high river level, but
flood impacts compared to sep 2008 are reportedly not quite so bad
due to recent flood mitigation projects. Still, many roads are
closed and properties are taking on water. In kent county, the crest
on Saturday is expected to climb just a little under the levels of
april 2013, but flood impacts will nonetheless be substantial near
the river especially in comstock park.

A tenth of an inch of rain fell Friday morning, and a quarter to
locally half inch of rain is expected Saturday night. This may not
increase the flood impacts much if at all, but it could delay the
recession of river levels.

Please see the latest flood statements or river hydrographs for
details. Hydrographs are available by going to weather.Gov grr and
clicking on the "rivers and lakes" link above the map of flood
warnings.

Grr watches warnings advisories
Mi... None.

Lm... None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MKGM4 - Muskegon, MI 11 mi29 min NE 4.1 G 5.1 31°F 1025.4 hPa26°F
LDTM4 - 9087023 - Ludington, MI 39 mi49 min NE 1 G 1.9 33°F 22°F
HLNM4 - 9087031 - Holland, MI 43 mi49 min NNE 5.1 G 7 33°F 1023.4 hPa
BSBM4 - Big Sable Point, MI 47 mi39 min N 4.1 G 8.9 33°F 1025.1 hPa

Wind History for Ludington, MI
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G6

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muskegon, Muskegon County Airport, MI15 mi24 minN 410.00 miPartly Cloudy32°F24°F73%1024.6 hPa
Fremont Municipal Airport, MI19 mi41 minN 010.00 miFair31°F23°F74%1023.7 hPa

Wind History from MKG (wind in knots)
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Last 24hrSE12SE10SE8SE4S5SW11SW14W12W11
G17
W8W7W9W6W7W7W7W7NW8NW7NW7N6N4N5N4
1 day agoNE6NE5NE6NE7NE7E12E10E13E11E10E9E6E10E11E11E13E15
G20
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2 days agoNW10NW11NW9N10NW11NW11NW10N8NW7N7NW7W6NW6NW6NW6N7N7N5NE6NE5NE4N5NE6NE6

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 (5,6,7,8)
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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.