Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Caledonia, MI

Version 3.4
NOTICE
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 6:49AMSunset 8:43PM Saturday August 17, 2019 9:43 PM EDT (01:43 UTC) Moonrise 9:06PMMoonset 7:40AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 405 Pm Edt Sat Aug 17 2019
.small craft advisory in effect from Sunday morning through Sunday evening...
Through early evening..West winds 5 to 10 knots. Partly Sunny. Waves 1 foot or less.
Tonight..South winds 5 to 15 knots. Partly cloudy with a chance of rain showers and a slight chance of Thunderstorms. Waves around 1 foot.
Sunday..Southwest winds 15 to 20 knots. Rain showers likely and a chance of Thunderstorms. Waves 1 to 3 feet building to 2 to 4 feet.
Sunday night..Southwest winds 10 to 15 knots veering northwest toward daybreak. Partly cloudy with a chance of rain showers and a slight chance of Thunderstorms. Waves 2 to 4 feet.
Monday..Northwest winds 10 to 15 knots. Sunny. Waves 1 to 3 feet.
Monday night..North winds 5 to 10 knots veering east toward daybreak. Mostly clear. Waves 1 foot or less.
Tuesday..Southeast winds 5 to 10 knots veering southwest. Sunny with a chance of rain showers. Waves less than 1 foot.
Wednesday..Northwest winds 10 to 20 knots. Mostly Sunny. Waves 2 to 3 feet.
Thursday..North winds 10 to 15 knots. Sunny. Waves 1 to 2 feet.
LMZ846 Expires:201908180800;;791535 FZUS53 KGRR 172005 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 405 PM EDT Sat Aug 17 2019 For waters within five nautical miles of shore on Lake Michigan LMZ846-180800-


7 Day Forecast for Marine Location Near Caledonia, MI
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location: 42.79, -85.55     debug


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 180000
afdgrr
area forecast discussion
national weather service grand rapids mi
800 pm edt Sat aug 17 2019
latest update...

aviation

Synopsis
Issued at 322 pm edt Sat aug 17 2019
- multiple chances for thunderstorms exist through mid week. Strong
storms are possible.

- dangerous swimming conditions are expected Sunday.

- cooler temperatures prevailing into next weekend.

Discussion (this evening through next Saturday)
issued at 322 pm edt Sat aug 17 2019
the main forecast concern is the potential for thunderstorms into
mid week, as zonal flow brings multiple weak waves over the area.

Ridging will then form in the west by Wednesday and move toward
lower michigan forcing the waves to the north of the region.

Therefore, the second half of the week into the weekend should be
more tranquil. Due to the uncertainty in timing of the waves and
the location of the convection as they react with meandering
fronts, confidence remains low for the first half of the forecast.

The wave moving by the area today will move away late this
evening, only to be followed by a stronger wave Sunday and a
weaker pulse Sunday night. Looking like strong thunderstorms are
possible Sunday with hail and gusty winds as the main hazards. The
additional waves, Tuesday through Wednesday, appear to again be
weaker and should result in non severe weather with some
thunderstorms.

Besides the thunder threat, patchy fog is expected late tonight
with locally dense fog possible. Fog could also be a problem into
mid week, as the forecast rainfall and atmospheric moisture could
lead to fog any night as temperatures cool off.

Temperatures will be above normal into mid week, then fall to
below normal into the weekend. Normal highs this time of year are
around 80 degrees and normal lows are around 60 degrees.

Aviation (for the 00z tafs through 00z Sunday evening)
issued at 800 pm edt Sat aug 17 2019
the threat of thunder this evening is not zero, but low enough to
remove the vcts for the azo btl jxn tafs and just go with vcsh.

Later tonight the threat will become fog stratus formation, and
while areas of ifr or lower cannot be ruled out, went with MVFR
at most sites.

Band of showers tstms expected to pass through the area from west
to east on Sunday between roughly 15z and 19z, with south-
southwest winds increasing and becoming gusty in the wake of that
convection.

Marine
Issued at 420 pm edt Sat aug 17 2019
winds and waves Sunday on lake michigan should reach small craft
advisory levels (ssw winds of 15 to 25 knots and 3-5 foot waves), so
an advisory was issued from 8 am to 8 pm. Winds and waves will
increase in the morning resulting in longshore currents and waves
topping piers given the high water levels. A beach hazard statement
will also be issued for Sunday. Calmer conditions are expected to
start the workweek.

Grr watches warnings advisories
Mi... Beach hazards statement from Sunday morning through Sunday
evening for miz037-043-050-056.

Lm... Small craft advisory from 8 am to 8 pm edt Sunday for lmz846>849.

Synopsis... 63
discussion... 63
aviation... Meade
marine... 63


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HLNM4 - 9087031 - Holland, MI 35 mi80 min NNW 4.1 G 4.1 73°F 1011 hPa67°F
45029 39 mi44 min N 3.9 G 3.9 73°F 72°F1 ft1011.2 hPa (-0.7)66°F
SVNM4 - South Haven, MI 47 mi44 min SE 6 G 7 73°F
MKGM4 - Muskegon, MI 52 mi44 min E 2.9 G 4.1 73°F 1010.9 hPa (-1.1)65°F
SJOM4 - St. Joseph, MI 69 mi44 min SSW 4.1 G 6 74°F 1012.5 hPa (-0.0)

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Grand Rapids, Gerald R. Ford International Airport, MI7 mi1.8 hrsWSW 510.00 miOvercast79°F64°F60%1011.3 hPa

Link to 5 minute data for KGRR

Wind History from GRR (wind in knots)
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Last 24hrS6S6SW11SW10W7SW8SW6W6SW4SW4SW6W6W7SW12
G17
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1 day agoE3CalmE3SE3CalmCalmCalmNE3SE3E3S3CalmCalmE4E6SE6SE63
G15
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2 days agoNE8NE6N8NE8NE7N11NE12NE8NE12NE10NE5NE8NE7NE7NE7N6NE66N6N5NE6NE5E5E4

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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wmap_A
GOES 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 (21,6,7,8)
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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.