Saturday, June24, 2017 L-36.com


Marine Weather and Tides
Pentwater, MI

Version 3.4
What's New / NOTES
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 6:04AMSunset 9:30PM Saturday June 24, 2017 6:14 AM EDT (10:14 UTC) Moonrise 5:50AMMoonset 9:03PM Illumination 0% Phase: New Moon; Moon at 0 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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LMZ848 Whitehall To Pentwater Mi- 339 Am Edt Sat Jun 24 2017
Today..West winds around 15 knots. Partly Sunny. A slight chance of showers and Thunderstorms in the afternoon. Waves 2 to 3 feet.
Tonight..West winds 15 to 20 knots. Partly cloudy. A chance of showers and Thunderstorms in the evening, then a chance of showers overnight. Waves 1 to 3 feet building to 2 to 4 feet toward daybreak.
Sunday..West winds 10 to 20 knots. Partly Sunny. A slight chance of showers until midday, then a chance of showers and Thunderstorms in the afternoon. Waves 2 to 4 feet.
Sunday night..Northwest winds 10 to 20 knots. Mostly cloudy with a chance of showers. Waves 2 to 4 feet.
LMZ848 Expires:201706241515;;733332 FZUS53 KGRR 240739 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 339 AM EDT Sat Jun 24 2017 For waters within five nautical miles of shore on Lake Michigan LMZ848-241515-

7 Day Forecast for Marine Location Near Pentwater, MI
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location: 43.78, -86.43     debug


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 240730
afdgrr
area forecast discussion
national weather service grand rapids mi
330 am edt Sat jun 24 2017
latest update...

synopsis short term long term marine

Synopsis
Issued at 330 am edt Sat jun 24 2017
a cool airmass will gradually continue to filter into the great
lakes region over the next few days. Highs today will reach the
lower 70s, be near 70 on Sunday and top out in the middle to upper
60s on Monday. Normal highs are in the lower 80s this time of year
so we are well below normal. Partly to occasionally mostly cloudy
skies can be expected the next few days with isolated showers. Each
afternoon a thunderstorm will be possible as well.

Short term (today through Monday)
issued at 330 am edt Sat jun 24 2017
this time of year 850mb temps at times surge past +20c, but not in
the short term. 850mb temps are in the lower teens c this morning
and will continue to slide throughout the period. It may be out of
season, but the talk of delta t's over lake michigan is on the
docket. The lake is around +17c right now, so lake clouds are
possible as temps drop to +7c, with lake generated precipitation
possible at +4c. We fall below +7c this evening and to around +4c on
Monday.

So, lake generated clouds are possible tonight through Monday, with
rain showers off the lake possible on Monday. The area will be in a
fall-like northwest flow with periodic shortwaves. Three distinct
shortwaves look to affect the area. One today, another tonight and
yet another on Monday.

We have isolated to scattered showers in the short term (20-40 pct
chances for precip). During the afternoon hours, diurnal instability
is forecast to build into the 600-1200 j kg range which is plenty
for an isolated storm. Thunder wording is therefore confined to the
afternoon hours. Not expecting significant precipitation this
weekend, but Monday has the potential to end up being a bit more on
the rainy side as the lake component kicks in with delta t's around
13c. Given that level of instability and the upper trough in place,
waterspouts are not out of the question on Monday with any of the
deeper showers storms that develop.

Long term (Monday night through Friday)
issued at 330 am edt Sat jun 24 2017
surface high pressure will move by to the south of michigan Tuesday
into Wednesday and should result in dry weather for the area. A low
pressure system is then expected to pass to the northwest of lower
michigan and drape a front across the region. Waves of low pressure
will then train from southwest to northeast along the front. If
these waves move across lower michigan, we could see areal and river
flooding by the end of the week.

Temperatures will be warming through the long term. They will be
below normal into mid week and near to a little above normal by
Friday. Normal highs are around 80 degrees and normal lows are in
the upper 50s.

Aviation (for the 06z tafs through 06z Saturday night)
issued at 150 am edt Sat jun 24 2017
vfr conditions expected through Saturday night. A brief shower is
possible tomorrow afternoon, but chances too low to include in the
tafs. Winds will become light overnight and pick back up tomorrow
afternoon out of the west. Gusts to 25 kts expected.

Marine
Issued at 330 am edt Sat jun 24 2017
have maintained the small craft advisory and beach hazards statement
for the southern three nearshore zones counties. Essentially they
are in effect from grand haven southward through Sunday evening.

The winds and waves are fairly borderline for this event however
with westerly winds of 15 to 22 knots much of the time. The waves
today are forecast to build to near 4 feet, but it is not a slam
dunk. Given water temps are still in the 60s and there will be
clouds and a few showers, this is not a high impact event.

On Sunday, winds look just a bit weaker, although we will be cold
air advecting, which always seems to overperform. So, letting the
headlines ride for Sunday as well. 4 to 5 footers look possible on
Sunday. Sunday will be even cooler, so again impact is not high.

A similar setup appears likely for Monday, so the marine headlines
for boaters and swimmers may need to be extended.

Hydrology
Issued at 257 pm edt Fri jun 23 2017
major flooding is expected along the chippewa river in isabella
county and sharp rises are also occurring along the muskegon basin
and will continue the next couple days as the crest moves down
the river. From 3 to 5 inches of rain fell last night combined
with earlier heavy rains.

The good news is that no heavy rain is expected through the
middle of next week which will allow those areas that are flooding
to recover. The next chance for significant rain will be Thursday
of next week.

Grr watches warnings advisories
Mi... Beach hazards statement through Sunday evening for miz056-064-
071.

Lm... Small craft advisory until 8 pm edt Sunday for lmz844>846.

Synopsis... Duke
short term... Duke
long term... 63
aviation... 63
hydrology... Ostuno
marine... Duke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDTM4 - 9087023 - Ludington, MI 12 mi45 min WNW 5.1 G 8 62°F 55°F
45024 15 mi25 min WNW 12 G 16 62°F 63°F2 ft1010.9 hPa57°F
BSBM4 - Big Sable Point, MI 20 mi35 min W 14 G 16 62°F 1010.2 hPa
MEEM4 - Manistee Harbor, MI 33 mi35 min WNW 12 G 16 62°F 1010.2 hPa
MKGM4 - Muskegon, MI 39 mi25 min NW 19 G 21 64°F 1009.8 hPa59°F
45161 42 mi35 min WNW 16 G 19 63°F 65°F3 ft1009.6 hPa

Wind History for Ludington, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ludington, Mason County Airport, MI12 mi80 minNW 510.00 miMostly Cloudy60°F55°F85%1008.8 hPa

Wind History from LDM (wind in knots)
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Last 24hrW3CalmNW6NW6NW4W6N5NW8NW6NW4W6SW6SW8SW7SW4NW4NW7NW7NW7NW5NW5NW4CalmNW6
1 day agoSE3S13
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SW10SW7SW4CalmCalmCalmNE3CalmNE3CalmCalmW3W4
2 days agoCalmCalmCalmCalmSW3W5W6SW9SW8SW9SW9SW9S7SW5SW7CalmCalmCalmCalmE3SE4SE7NW7SE5

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 (6,6,7,8)
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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.