Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Holland, 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 7:30AMSunset 7:43PM Thursday September 21, 2017 5:13 PM EDT (21:13 UTC) Moonrise 7:51AMMoonset 7:48PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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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LMZ846 Holland To Grand Haven Mi- 324 Pm Edt Thu Sep 21 2017
Tonight..South winds 5 to 10 knots. Partly cloudy. Patchy fog overnight. Waves 1 foot or less.
Friday..South winds 5 to 15 knots. Sunny. Waves 1 foot or less.
Friday night..South winds 5 to 10 knots. Mostly clear. Waves 1 foot or less.
Saturday..Southwest winds 5 to 10 knots. Sunny. Waves 1 foot or less.
LMZ846 Expires:201709220315;;725865 FZUS53 KGRR 211924 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 324 PM EDT Thu Sep 21 2017 For waters within five nautical miles of shore on Lake Michigan LMZ846-220315-

7 Day Forecast for Marine Location Near Holland, MI
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location: 42.77, -86.1     debug


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 211928
afdgrr
area forecast discussion
national weather service grand rapids mi
325 pm edt Thu sep 21 2017
latest update...

synopsis short term long term hydro marine

Synopsis
Issued at 325 pm edt Thu sep 21 2017
hot and humid weather will continue through the rest of the week and
weekend. Isolated thunderstorms will continue to develop near to
east of a line from alma to kalamazoo late this afternoon into early
evening but most locations will not receive any beneficial rainfall.

Dry weather is forecast Friday through the weekend into early next
week and the next good chance for rain will not come until the
middle of next week.

Short term (this evening through Saturday night)
issued at 325 pm edt Thu sep 21 2017
strong instability has developed this afternoon near to east of a
line from alma to kalamazoo where ml CAPE values have reached 2500
j kg. Isolated convection continues to develop ATTM in this area
along and just ahead of a weakening front.

Given vis Sat radar trends ATTM and building instability we will
feature a chc of a shower or storm in the fcst near to east of a
line from alma to kazo from mid to late aftn into early eve. I did
add patchy fog to the fcst during the early morning hours Friday
given the very humid airmass in place and very little boundary layer
mixing at that time.

Hot and humid and dry wx will continue Friday through Saturday
wiht sfc upper ridging in place and persistent south to southwest
flow. High temps both days will reach the upper 80's to lower 90's
with low temps ranging from the middle 60's to lower 70's.

Long term (Sunday through Thursday)
issued at 325 pm edt Thu sep 21 2017
big changes to the upper air pattern occur out in the long term
portion of the forecast. The upper ridge over the great lakes, which
will have been in place for days by Sunday breaks down next week.

The ridge which is responsible for our hot weather is essentially
squeezed by an advancing deep trough out of the west and hurricane
maria. 500mb heights of 590dm at 12z Sunday drop into the 560s dm's
on Thursday of next week.

We remain well above normal temps on Sunday and Monday with highs
well into the 80s. Dry weather is forecast both days with surface
ridging slowly sliding to the east. On Tuesday the approaching front
will still be upstream. Temperatures will remain well above normal,
but may be tempered a bit by clouds and slightly cooler 850mb temps.

There are some timing differences, with the ECMWF being a bit
quicker, but the front that changes our air mass (and ushers us into
fall like air) moves through on Wednesday. Showers and storms are
possible with the frontal passage. Much cooler air moves in behind
the front with highs in the 70s on Wednesday and 60s on Thursday.

The air is cool enough on Thursday in fact that we would be looking
at lake effect rain showers.

Aviation (for the 18z tafs through 18z Friday afternoon)
issued at 205 pm edt Thu sep 21 2017
limited aviation concerns the next 24 hours with mainlyVFR
weather forecast. The exception to the rule will be light fog
late tonight. Between mainly 09z and 14z we will see fog form.

3-5sm visibilities are expected in spots tonight. Localized fog
down into the ifr category is possible, especially towards klan
and kjxn.

Otherwise, scattered to broken clouds with bases at or above
15,000ft are expected. Some scattered to possibly broken diurnal
cumulus development is also expected both today and on Friday.

Bases on the cumulus deck should be around 4,000ft.

Marine
Issued at 325 pm edt Thu sep 21 2017
fairly minimal wind speeds and wave heights are forecast through
Friday with south to southwest winds of mainly around 5 to 10 kts
and wave heights of less than two feet. Patchy fog is possible
mainly early Friday morning.

Hydrology
Issued at 325 pm edt Thu sep 21 2017
a few thunderstorms may develop during the afternoon and early
evening to the east of us 131. These storms will have the potential
to produce very heavy rainfall. Coverage of these storms will be low
if development occurs, and most locations will remain dry. Dry
conditions with near-record warmth is then expected Friday through
the weekend. The next chance for rain is late Tuesday night and
Wednesday.

Grr watches warnings advisories
Mi... None.

Lm... None.

Synopsis... Laurens
short term... Laurens
long term... Duke
aviation... Duke
hydrology... Hlo
marine... Laurens


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HLNM4 - 9087031 - Holland, MI 6 mi43 min Calm G 1 75°F 1015.7 hPa
45029 13 mi23 min ENE 1.9 G 1.9 74°F 69°F1 ft1015.7 hPa68°F
SVNM4 - South Haven, MI 27 mi33 min Calm G 1 80°F
45168 29 mi23 min N 1.9 G 1.9 76°F 72°F1 ft1015.9 hPa68°F
45161 31 mi33 min S 1.9 G 3.9 71°F 68°F1016.4 hPa
MKGM4 - Muskegon, MI 34 mi23 min SW 2.9 G 4.1 73°F 1015.9 hPa70°F
SJOM4 - St. Joseph, MI 51 mi73 min NNE 5.1 G 7 78°F 1016.9 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, MI1 mi80 minVar 510.00 miFair89°F69°F52%1016.3 hPa

Wind History from BIV (wind in knots)
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Last 24hrS11S9SE6SE7S7S6S3S5S4CalmCalmSE4SE6S3SE3CalmSE3W6SW83W6SW554
1 day agoE6E7E5E4E3E5CalmE3E4E5SE4CalmCalmSE3SE6S7SE6S8S8S75S9S8SE11
2 days agoNW5NW5CalmCalmCalmCalmE4E5E6E6E7E7E5E6E6E6E7E6E9E10E9E10E73

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 (17,4,5,8)
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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.