Sunday, July23, 2017 L-36.com


Marine Weather and Tides
South Haven, 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 6:26AMSunset 9:15PM Sunday July 23, 2017 4:34 AM EDT (08:34 UTC) Moonrise 5:44AMMoonset 8:28PM Illumination 0% Phase: New Moon; Moon at 29 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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LMZ844 St Joseph To South Haven Mi- 356 Am Edt Sun Jul 23 2017
Early this morning..Southwest winds 5 to 10 knots. Mostly cloudy. Areas of fog. Waves less than 1 foot.
Today..Southwest winds 5 to 10 knots veering west. Areas of fog until midday. Partly Sunny with a chance of showers and Thunderstorms until midday, then Sunny in the afternoon. Waves around 1 foot.
Tonight..North winds 5 to 15 knots. Partly cloudy. Patchy fog overnight. Waves 1 to 3 feet.
Monday..North winds 15 to 20 knots. Partly Sunny. Waves 2 to 4 feet.
Monday night..Northeast winds 10 to 15 knots veering east after midnight. Partly cloudy in the evening then becoming mostly clear. Waves 2 to 3 feet.
LMZ844 Expires:201707232015;;689300 FZUS53 KGRR 230756 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 356 AM EDT Sun Jul 23 2017 For waters within five nautical miles of shore on Lake Michigan LMZ844-232015-

7 Day Forecast for Marine Location Near South Haven city, MI
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location: 42.4, -86.27     debug


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 230730
afdgrr
area forecast discussion
national weather service grand rapids mi
330 am edt Sun jul 23 2017
latest update...

synopsis short term long term marine

Synopsis
Issued at 330 am edt Sun jul 23 2017
low pressure passing through the state today will bring scattered
showers and thunderstorms. High pressure will provide a stretch
of dry and less humid weather Monday and Tuesday before the next
front brings more scattered showers and storms later Wednesday
into early Thursday.

Short term (today through Tuesday)
issued at 330 am edt Sun jul 23 2017
combination of h5 upr low shortwave and sfc sold front dropping
southeast through the great lakes region will lead to scattered
convection today. CAPE shear profiles suggest the possibility of a
few strong to perhaps severe storms by afternoon, with capes near
1500 j kg and 0-6 km shear around 35 knots.

However the latest rap soundings have a rather dry look and it
will be somewhat of a race against time of building up enough
surface based instability before the west northwest low level flow
off lake michigan develops and strengthens. Models do seem to be
a bit slower less aggressive in this regard which suggests the
possibility of a longer window of time with decent sfc convergence
before the lake shadow spreads inland.

In general, the developing west northwest flow off lake mi should
tend to focus most convection east of highway 131 by 18z, and
east of u.S. 127 by 21z. Mostly sunny skies should be sweeping
eastward of the lake as well this afternoon.

One other thing to watch for later today is the potential of a
stronger convective cluster that may impact the chicago area which
may could clip far SRN lake michigan van buren county.

Otherwise some other things of note in the short term include
areas of dense fog early this morning which should lift by mid
morning, and a potential for considerable clouds on Monday. The
presence of a thermal trough aloft and low level cyclonic flow
will probably result in considerable diurnal cloudiness,
particularly inland from lake mi.

Long term (Tuesday night through Saturday)
issued at 330 am edt Sun jul 23 2017
main concern is thunderstorm potential late Wednesday into early
Thursday. Latest medium range guidance suggests a line of convection
will enter the area around or shortly after dark Wednesday night. As
noted already, there is sufficient forcing and instability for the
mention of thunderstorms. Storm intensity could depend chiefly on
when they occur relative to peak afternoon heating. Regardless, they
should progress rapidly through the area with little flood concerns
anticipated at this time.

After precipitation exits Thursday, dry conditions and seasonable
temperatures are expected to persist into Saturday.

Aviation (for the 06z tafs through 06z Sunday night)
issued at 202 am edt Sun jul 23 2017
high confidence for widespread ifr and occasional lifr conditions
through 12z, although onset may be slightly delayed farther east
at lan terminal. We are much less certain after 12z, but the
general expectation is for a rise toVFR visibilities MVFR
ceilings with the possibility for thunderstorms moving southeast
into the area before 18z. After 18z,VFR should predominate with
scattered thunderstorms in the vicinity. Gusty winds with storms
will be more likely farther east around jxn and lan terminals.

Marine
Issued at 330 am edt Sun jul 23 2017
areas of dense fog over lake michigan this morning are expected
to mix out this afternoon with arrival of drier air westerly
flow. Scattered storms will pose a threat to mariners, mainly
this morning.

Hydrology
Issued at 1123 am edt Sat jul 22 2017
we again escaped the heavy to excessive rain that fell in
southern wisconsin and northern illinois. While that area floods,
most of our area continues to run drier than normal these past 1
to 2 weeks. With high atmospheric water vapor content, the showers
Saturday morning efficiently put down over a half inch of rain but
only in a few isolated spots. Scattered showers or storms Sunday
will provide only spotty relief to the dry weather. After that, the
next potential for a storm will be Wednesday.

Grr watches warnings advisories
Mi... None.

Lm... None.

Synopsis... Meade
short term... Meade
long term... Tjt
aviation... Tjt
hydrology... Cas
marine... Meade


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SVNM4 - South Haven, MI 1 mi35 min E 2.9 G 2.9 66°F
45168 3 mi25 min SE 1.9 G 3.9 68°F 72°F1 ft1008.7 hPa64°F
SJOM4 - St. Joseph, MI 24 mi35 min NE 1.9 G 2.9 70°F 1009.1 hPa (-0.7)
HLNM4 - 9087031 - Holland, MI 26 mi53 min ENE 2.9 G 5.1 67°F 1008.4 hPa
45026 - St. Joseph, MI 34 mi25 min SE 1.9 G 3.9 72°F 74°F1 ft1008.1 hPa68°F
45029 35 mi25 min E 3.9 G 3.9 66°F 70°F1 ft1008.5 hPa64°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 44 mi45 min Calm G 1.9 70°F 70°F1008.8 hPa (+0.0)
MKGM4 - Muskegon, MI 57 mi35 min N 1.9 G 1.9 67°F 1008.7 hPa (-0.3)67°F

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
South Haven, South Haven Area Regional Airport, MI3 mi40 minN 00.25 miFog66°F66°F99%1008.8 hPa
Southwest Michigan Regional Airport, MI20 mi42 minN 01.25 miFog/Mist68°F66°F93%1008.3 hPa

Wind History from BEH (wind in knots)
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Last 24hrS7SE13SE4E3S4S5CalmW936W9W7W7NW7W6W4CalmCalmCalmCalmE3CalmCalmCalm
1 day agoCalmCalmNE53SE3E8E6SE6CalmS5SE6CalmNW3NW33CalmE3E4E3SE6SE8SE8SE6E3
2 days agoNW4W6W9W10W7S12S7SW15
G24
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G22
W12W8NW5NW565CalmCalmCalmCalmCalmCalmE3CalmCalm

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 (4,6,7,8)
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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.