Tuesday, August20, 2019 L-36.com


Marine Weather and Tides
Pentwater, 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 6:54AMSunset 8:42PM Tuesday August 20, 2019 10:59 PM EDT (02:59 UTC) Moonrise 10:21PMMoonset 10:41AM Illumination 71% Phase: Waning Gibbous; Moon at 20 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- 1005 Pm Edt Tue Aug 20 2019
Rest of tonight..West winds around 5 knots backing south 10 to 15 knots toward daybreak. Partly cloudy with a slight chance of showers and Thunderstorms. Areas of fog. Waves around 1 foot.
Wednesday..North winds to 30 knots. Mostly Sunny. Waves 3 to 5 feet.
Wednesday night..North winds 10 to 15 knots veering east 5 to 10 knots after midnight. Partly cloudy. Waves 1 to 3 feet.
Thursday..North winds 5 to 15 knots. Sunny. Waves 1 to 2 feet.
Thursday night..Northeast winds 10 to 15 knots. Mostly clear. Waves 1 to 2 feet.
Friday..Northeast winds 10 to 15 knots backing north late in the day. Sunny. Waves 1 to 2 feet.
Saturday..Southeast winds 10 to 15 knots veering northwest 5 to 10 knots late in the day. Sunny. Waves 1 foot or less.
Sunday..South winds 10 to 15 knots. Mostly Sunny. Waves 1 to 2 feet.
LMZ848 Expires:201908210900;;960244 FZUS53 KGRR 210205 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 1005 PM EDT Tue Aug 20 2019 For waters within five nautical miles of shore on Lake Michigan LMZ848-210900-


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 202315
afdgrr
area forecast discussion
national weather service grand rapids mi
715 pm edt Tue aug 20 2019
latest update...

aviation

Synopsis
Issued at 327 pm edt Tue aug 20 2019
- threat for strong to severe storms this afternoon and evening.

- isolated showers storms both tonight into Wednesday.

- dry weather Wednesday night through at least Sunday.

- cooler weather forecast Thursday through Saturday.

Discussion (this evening through next Tuesday)
issued at 327 pm edt Tue aug 20 2019
first concern in the 7 day forecast is the threat of thunderstorms
this afternoon and evening. Severe weather remains possible given
the amount of instability in place. MUCAPE values over the
southern 2 3rds of the forecast area remain in excess of 3000 j kg
with li's of -10c. So, plenty of instability is in place. Shear
remains lacking with 0-6km values less than 30 knots. So far the
warm sector cores have gone up modestly across the area but have
not reached severe levels. We are interested to see what happens
when the gust front associated with the MCV earlier convection
over illinois moves into an unstable air mass over the southwest
cwa. We should see convection grow upscale as this broken line of
showers and storms comes off the lake an into areas southwest of
grr. Showers and storms are likely late this afternoon and evening
as the MCV gust front moves east across our area. Cannot rule out
some severe weather with damaging winds and large hail being the
main threats.

Isolated to scattered showers and storms will remain possible
tonight and into much of Wednesday as it takes until late in the
day before the front progresses south of the forecast area. A
stronger storm or two will be possible from grr to the south and
east from the midday hours of Wednesday through the afternoon.

Wednesday night through Sunday looks to be dry with a slow moving
surface high pressure system moving through the area. Highs
Thursday through Saturday only look to top out in the 70s with
850mb temperatures in the +5c to +10c range.

Next chances for rain come out in the Monday Tuesday time frame of
next week when a cold front presses in from the west.

Aviation (for the 00z tafs through 00z Wednesday evening)
issued at 711 pm edt Tue aug 20 2019
scattered showers and thunderstorms diminishing from west to east
rapidly since 2200 utc. Any remnant showers should end by 0000 utc
so will leave all west michigan tafs dry tonight. Concerned about
fog development overnight. Inherited tafs show visibilities
falling to around 2sm around sunrise... Which appears reasonable.

Additional showers and possibly a few thunderstorms may develop
after 15z Wednesday as cold front pushes through area.

Marine
Issued at 327 pm edt Tue aug 20 2019
holding off on headlines for now, but am concerned about a period
of higher waves Wednesday starting up north near ludington at 11am
and working south through the course of the day. 3-5 footers look
quite possible with our local glerl model run off of the namnest
winds showing a few 6 footers. The waves drop below 4 feet via
this model run near south haven around midnight tomorrow night.

So, the time frame of concern is roughly noon on Wednesday to
midnight.

Winds will generally be on the light side through Wednesday
morning with waves remaining low as well through that time.

Grr watches warnings advisories
Mi... None.

Lm... None.

Synopsis... Duke
discussion... Duke
aviation... Mws
marine... Duke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDTM4 - 9087023 - Ludington, MI 12 mi66 min Calm G 1.9 71°F 68°F
45024 15 mi40 min SE 3.9 G 5.8 71°F 72°F1 ft1014.4 hPa71°F
BSBM4 - Big Sable Point, MI 20 mi80 min ESE 1 G 1.9 71°F 1014.2 hPa
MEEM4 - Manistee Harbor, MI 33 mi80 min S 1.9 G 9.9 71°F 1014.9 hPa
MKGM4 - Muskegon, MI 39 mi40 min E 1 G 1 73°F 1012.9 hPa70°F
45161 41 mi60 min NNW 3.9 G 5.8 73°F 72°F1 ft1013.3 hPa (+0.8)

Wind History for Ludington, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ludington, Mason County Airport, MI12 mi65 minN 03.00 miFog/Mist69°F68°F98%1013.2 hPa

Link to 5 minute data for KLDM

Wind History from LDM (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE3E3CalmSE3CalmW3W4SW5W4SW8SW6NW3Calm
1 day agoSW6SW6W5W3NW3N3CalmCalmCalmCalmCalmNE3CalmSE5CalmSW7W5SW7W7W5CalmCalmCalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmSE4SE5S4S6S8SE11S8SW8SW10SW14
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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

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Wind Forecast for Grand Rapids, MI (22,6,7,8)
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Ground Weather Radar Station Grand Rapids/Muskegon, MI
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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.