Tuesday, August20, 2019 L-36.com


Marine Weather and Tides
Manistee, MI

Version 3.4
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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 11:49 AM EDT (15:49 UTC) Moonrise 10:20PMMoonset 10:41AM Illumination 75% 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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LMZ849 Pentwater To Manistee Mi- 1105 Am Edt Tue Aug 20 2019
Rest of today..Southwest winds 5 to 10 knots. Mostly Sunny with a slight chance of showers and Thunderstorms. Waves less than 1 foot.
Tonight..Southwest winds 5 to 10 knots veering west 10 to 15 knots toward daybreak. Partly cloudy with a slight chance of showers and Thunderstorms. Waves around 1 foot.
Wednesday..North winds 10 to 20 knots. Mostly Sunny. Waves 2 to 3 feet.
Wednesday night..Northeast winds 5 to 10 knots. Mostly clear. Waves 1 to 2 feet.
Thursday..North winds 5 to 15 knots. Sunny. Waves 1 to 2 feet.
Friday..North winds 10 to 15 knots. Sunny. Waves around 1 foot.
Saturday..Southeast winds around 10 knots backing north late in the day. Sunny. Waves 1 foot or less.
LMZ849 Expires:201908202100;;520037 FZUS53 KGRR 201506 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 1105 AM EDT Tue Aug 20 2019 For waters within five nautical miles of shore on Lake Michigan LMZ849-202100-


7 Day Forecast for Marine Location Near Manistee, MI
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location: 44.25, -86.33     debug


Area Discussion for - Gaylord, MI
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Fxus63 kapx 201527
afdapx
area forecast discussion
national weather service gaylord mi
1127 am edt Tue aug 20 2019

Update
Issued at 1127 am edt Tue aug 20 2019
high clouds from the blow off of the ongoing mcss south and west
of the forecast area. This is affecting the warm front that looks
to be struggling to move north as thought earlier. If the high
clouds (mainly south of m-72) can thin out and allow more sun,
then the warm front may move into the region. The more northerly
mcs has light rain showers streaming off its northern periphery
and heading our way. The nmm and arw seem to be handling this
reasonably well, but a tad slow. The ideas is that the showers
break out along the warm front and move into the region east of
i-75 and south of m-72. This would be between 18z and 21z this
afternoon. Hrrr agrees with this general idea as well. So will try
some blending of the pops. So the expectation is that isolated
showers will occur with the scattered rain being one outcome and
nothing being the other outcome.

Near term (today through tonight)
issued at 433 am edt Tue aug 20 2019

Rain chances minimal through tonight...

high impact weather potential: minimal.

Pattern synopsis forecast: midnight surface composite analysis shows
a wavy stationary frontal boundary (the cold front that crossed
northern mi last night) lying across the lower great lakes southern
lower mi northern il far northeast mo. Boundary delineating a
moisture gradient with dew points above 20c south of the front... 0-
1km mean mixing ratios greater than 15g kg stretches from il mo and
into the central plains as far north as eastern sd. 00z apx
sounding was dry in both a relative and absolute sense... With dew
point depressions at or above 10c below 300mb... And a precipitable
water of 0.68 inch (compared to 1.25 inch at dtx). Dry air and
general large scale subsidence contributing to mainly clear skies
across northern mi early this morning... Some convection has been
developing near and south of the front across the ohio valley... As
well as across parts of the dakotas southwest mn northwest ia within
strong low level theta-e gradient advection and aided by a short
wave trough evident in water vapor imagery. Generally zonal flow
across the upper midwest great lakes region.

Stationary boundary over southern lower early this morning is
expected to gradually lift north during the day... Not much of a wind
shift along it but certainly a low level moisture theta-e gradient
that gets up toward us-10 by this evening. Meanwhile... Zonal flow
will begin to amplify a bit with resulting height falls into the
upper midwest great lakes tonight. A weak lead impulse will cross
the forecast area tonight... Along with a surface cold front that
will probably lie across northern lower by Wednesday morning.

Primary forecast concerns: precipitation potential with encroaching
front from the south this afternoon and approaching cold front from
the northwest tonight. For today... Not much potential through at
least mid afternoon with scattered activity across southern lower
along boundary and developing buoyancy gradient aided by weak short
wave trough passage. Northern edge of instability gradient pushes
toward the m-55 corridor by evening. Some question as to what
surface dew points will do this afternoon across northern lower...

evolution of very dry layer between 850-700mb on 00z grb sounding
may be a player as that advects across the region on westerly flow.

Dew points will likely sink into the 40s if mixed layer can tap into
that (which isn't unreasonable)... Rap is really dry with some upper
30s across far northeast lower. But think dew points in the 40s are
not unreasonable... With more humid air getting into southern
portions of the forecast area by late afternoon. Can't rule out
some showers in the saginaw bay vicinity where capping will be
weakest... Possibly aided by lake breezes though mixed layer likely
to be fairly deep so uncertain whether lake breeze circulation can
shove a parcel up to the LFC (which may be above 800mb).

Another weak short wave trough expected to slide across the forecast
area this evening... Still not sure forcing will be enough to
generate showers except near saginaw bay. Could end up being that
best chance for precipitation will be along the cold front after
midnight with a decent signal for low clouds drizzle across eastern
upper northwest lower. Bottom line is that precipitation chances

Short term (Wednesday through Thursday)
issued at 433 am edt Tue aug 20 2019
high impact weather potential: none
pattern synopsis and forecast:
a weak cold front associated with a low pressure system over the
james bay region will sweep into the forecast area late Tuesday
night into Wednesday. This slow moving boundary may trigger some
more showers Wednesday afternoon, mainly closer to the saginaw bay
region where diurnal heating and possible lake breezes may aid in
the development. Although some high pressure builds back into the
region later Wednesday, wouldn't be surprised if the upper level
troughing and available moisture produce more cloud cover than is
forecast at this time. Winds will become southwesterly ahead of the
aforementioned cold front Tuesday afternoon and veer to the
northwest behind the front Wednesday and Thursday. With the caa...

winds could become gusty Wednesday afternoon, especially over the
lakes and eastern upper. Winds will become lighter late Thursday and
begin to veer more northerly by Friday morning. Temperatures will be
cooler Wednesday once again with the CAA behind the said boundary,
reaching into the low to mid 70s for most locations... Closer to
saginaw bay may see low 80s. As colder air continues to filter in on
northwesterly flow, some locations may only reach into the mid 60s
Thursday, while temperatures will moderate a bit thereafter,
reaching into the low to mid 70s once again on Friday.

Long term (Thursday night through Monday)
issued at 433 am edt Tue aug 20 2019
high impact weather... None is expected.

The long term models are in agreement with this period mostly being
under surface high pressure with the exception of yet another weak
cold front and attendant upper level wave dropping down from central
canada during the late weekend Monday timeframe. This will most
likely be the only precipitation chances during this forecast
period. Temperatures will moderate a bit each day, beginning in the
mid to upper 70s Saturday and reaching near 80 through the remainder

Aviation (for the 06z tafs through 06z Tuesday night)
issued at 433 am edt Tue aug 20 2019
fog formed at mbl beginning at 03z. Expect ifr fog development
overnight at apn pln as well. Fog will quickly burn off in the
morning, withVFR conditions after that. Increasing mid clouds on
Tuesday, maybe a stray shower or two in the evening.

Light winds, with onshore lake breezes Tuesday afternoon.

Marine
Issued at 433 am edt Tue aug 20 2019
marine winds will be dominated again by local effects today as
overall pressure gradient not particularly strong. Cold front will
cross the nearshore zones tonight... Which will shift winds to
north northwest Wednesday morning. Cold advection mixing will allow
for gusty winds in marine areas Wednesday... Possible for a round of
small craft advisories later Wednesday afternoon night.

Apx watches warnings advisories
Mi... None.

Lh... None.

Lm... None.

Ls... None.

Update... Jl
near term... Jpb
short term... Tl
long term... Tl
aviation... Jz
marine... Jpb


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MEEM4 - Manistee Harbor, MI 1 mi70 min ESE 4.1 G 6 76°F 1017.3 hPa
BSBM4 - Big Sable Point, MI 17 mi70 min ESE 6 G 7 75°F 1016.9 hPa
LDTM4 - 9087023 - Ludington, MI 22 mi56 min ESE 2.9 G 5.1 74°F 61°F
45024 23 mi40 min ESE 1.9 G 1.9 71°F 70°F1 ft1017.2 hPa64°F

Wind History for Ludington, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Manistee County - Blacker Airport, MI5 mi54 minN 010.00 miFair75°F63°F66%1016.3 hPa
Ludington, Mason County Airport, MI20 mi55 minSE 410.00 miFair74°F61°F65%1016.6 hPa

Link to 5 minute data for KMBL

Wind History from MBL (wind in knots)
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Last 24hrCalmCalmW7W7NW7W9W8W6CalmCalmE3E3E3E3E4E4E3E4E4E6CalmE4SE4Calm
1 day ago6
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W7W7W9SW5SW6W9NE3CalmCalmE3CalmCalmCalmCalmCalm
2 days agoW10W9W8W6W63CalmW4CalmCalmCalmE3E3E3CalmSE3SE3E3E5E4E555S8
G17

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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GOES Local Image of GreatLakes    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 Gaylord, MI (11,2,3,4)
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Ground Weather Radar Station Gaylord, 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.