Wednesday, October18, 2017 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 8:02AMSunset 6:57PM Wednesday October 18, 2017 12:51 PM EDT (16:51 UTC) Moonrise 5:39AMMoonset 5:49PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 1136 Am Edt Wed Oct 18 2017
.small craft advisory in effect through late tonight...
Rest of today..South winds to 30 knots increasing to gales to 35 knots late in the day. Sunny. Waves 6 to 9 feet.
Tonight..Southwest winds to 30 knots veering west 15 to 25 knots toward daybreak. Mostly clear. Waves 6 to 9 feet.
Thursday..West winds 10 to 20 knots. Sunny. Waves 4 to 6 feet subsiding to 1 to 3 feet late in the day.
Thursday night..Southwest winds around 10 knots backing south toward daybreak. Clear. Waves around 1 foot.
LMZ847 Expires:201710182115;;046674 FZUS53 KGRR 181536 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 1136 AM EDT Wed Oct 18 2017 For waters within five nautical miles of shore on Lake Michigan LMZ847-182115-

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 181450
afdgrr
area forecast discussion
national weather service grand rapids mi
1050 am edt Wed oct 18 2017
latest update...

hydro

Synopsis
Issued at 313 am edt Wed oct 18 2017
a large area of high pressure over the central appalachians will
dominate our weather pattern over the next few days. This system
will act to keep our weather dry with relatively warm and
breezy conditions continuing. A weakening cold front moves in
from the northwest... But this system dissipates over the area on
Thursday.

Short term (today through Friday)
issued at 313 am edt Wed oct 18 2017
models are in decent agreement in showing the cold front currently
in the upper ms valley to track southeast today and into the
region tonight. It will be weakening as it moves in and should
dissipate over the area on Thursday. The gulf is cut off and this
feature will be lacking moisture. Thus no rain is in the forecast.

What cloud cover is associated with this front is mainly mid to
upper level cloudiness.

Warm condition will prevail today a the low level thermal ridge
moves in. Based on the 925 temperature values... Some 70s look
possible. Deeper mixing today will also support gusty wind
conditions. With mixing heights reaching into the 20 to 30 knot
winds... Windy conditions look likely... Especially the warmest part
of the day.

Less wind is forecasted for Thursday. The pressure gradient
weakens as a result of the front dissipating over the area. Warm
air advection resumes for Friday. Well above normal temperatures
will continue.

Long term (Friday night through Tuesday)
issued at 313 am edt Wed oct 18 2017
some changes are coming to the forecast, especially late in the
period.

High pressure over the southeast us will continue to bring warm air
north through early Sunday. Highs in the 70s are expected Saturday
and upper 60s Sunday. But then a cold front front blows through
Sunday and models continue to show showers along the front. A very
strong short wave coming in behind the front will then begin to
carve out a very high amplitude trough over the great lakes early
next week. We're likely to see the coldest air of the season so far
during this time. H8 temps are progd to fall from 10c Tuesday
morning to -4c by Wednesday morning. Highs Monday will be in the
lower 60s, which will be much cooler than current temps, but still a
couple of degrees above normal. By Tuesday, highs will only be in
the lower to mid 50s. Given the strength of the short wave coming in
next week, showers are likely during this time.

Aviation (for the 12z tafs through 12z Thursday morning)
issued at 634 am edt Wed oct 18 2017
the atmosphere will remain relatively dry through the
period... Especially in the low levels. Thus the forecast is for
vfr conditions at the TAF sites. A tight pressure gradient will
exist today. As the temperature warms up... This will increase the
mixing height... Supporting increasing winds. It looks like gusts
over 20 knots will occur today.

Marine
Issued at 313 am edt Wed oct 18 2017
the pressure gradient tightens up today as a cold front approaches
from the northwest. Ongoing small craft conditions will continue
for most of the region... But gales may develop this afternoon for
the northern couple of zones. The pressure gradient weakens later
tonight... So any gale conditions should diminish under criteria.

Hydrology
Issued at 1050 am edt Wed oct 18 2017
we continue to see river levels slowly recede for the most part
after the heavy rain event last weekend. The trend down will
continue through Saturday with dry weather expected through then.

The next rain event for the area beginning as early as Saturday
night and more likely Sunday will bring measurable rain, however it
appears that rain amounts will be limited to a quarter of an inch or
less. This will not cause any appreciable rises on the rivers and
streams. Additional light rainfall is also expected for the first
half of next week.

Grr watches warnings advisories
Mi... None.

Lm... Small craft advisory until 2 pm edt this afternoon for lmz848-
849.

Gale warning from 2 pm this afternoon to 4 am edt Thursday for
lmz848-849.

Small craft advisory until 4 am edt Thursday for lmz844>847.

Synopsis... Mjs
short term... Mjs
long term... 04
aviation... Mjs
hydrology... Njj
marine... Mjs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MKGM4 - Muskegon, MI 11 mi41 min SSW 21 G 23 60°F 1020.3 hPa54°F
45161 15 mi51 min S 19 G 21 60°F 61°F1020.1 hPa (-0.3)
45029 34 mi31 min SSW 18 G 23 59°F 60°F5 ft1020.9 hPa50°F
LDTM4 - 9087023 - Ludington, MI 39 mi51 min SSW 18 G 23 61°F 50°F
45024 42 mi31 min S 21 G 25 61°F 60°F6 ft1017.9 hPa55°F
HLNM4 - 9087031 - Holland, MI 43 mi51 min S 22 G 25 57°F 1020.3 hPa (-0.5)49°F
BSBM4 - Big Sable Point, MI 47 mi38 min S 19 G 26 62°F 1017.9 hPa

Wind History for Ludington, MI
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N12
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muskegon, Muskegon County Airport, MI15 mi56 minSSW 14 G 2210.00 miFair63°F52°F68%1020.6 hPa
Fremont Municipal Airport, MI19 mi60 minSSW 14 G 1710.00 miFair63°F51°F67%1020 hPa

Wind History from MKG (wind in knots)
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Last 24hrSW14
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S12S11S9S10SW10S9SW12SW13SW12SW12SW13SW10SW12SW14S11S13S15S16
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1 day agoW10W10W10SW11SW9SW7S5CalmSE7S7SE4SW8SW9SW14SW11
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2 days agoNW22
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N9N11
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N6N4CalmN6SE4E3SE4CalmE5NE3E3E4E5SE6E5SE6S5

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 (12,3,4,5)
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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.