Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
South Haven, 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 6:55AMSunset 8:39PM Wednesday August 21, 2019 9:02 PM EDT (01:02 UTC) Moonrise 10:48PMMoonset 11:41AM Illumination 61% Phase: Waning Gibbous; Moon at 21 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- 405 Pm Edt Wed Aug 21 2019
Through early evening..West winds 5 to 10 knots. Partly Sunny with a slight chance of showers and Thunderstorms. Waves 1 to 2 feet.
Tonight..Northeast winds 10 to 20 knots. Partly cloudy. Waves 1 to 3 feet.
Thursday..North winds 15 to 25 knots. Mostly Sunny. Waves 1 to 3 feet.
Thursday night..Northeast winds 15 to 25 knots. Mostly clear. Waves 2 to 4 feet.
Friday..Northeast winds 10 to 15 knots. Sunny. Waves around 1 foot.
Friday night..Northeast winds 10 to 15 knots veering east after midnight. Mostly clear. Waves 1 to 2 feet.
Saturday..East winds 5 to 15 knots. Sunny. Waves 1 foot or less.
Sunday..Southeast winds 10 to 15 knots. Mostly Sunny. Waves 1 foot or less.
Monday..South winds 10 to 15 knots. Partly Sunny with a chance of rain showers. Waves 1 to 2 feet.
LMZ844 Expires:201908220800;;997682 FZUS53 KGRR 212005 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 405 PM EDT Wed Aug 21 2019 For waters within five nautical miles of shore on Lake Michigan LMZ844-220800-


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


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 212352
afdgrr
area forecast discussion
national weather service grand rapids mi
752 pm edt Wed aug 21 2019
latest update...

aviation

Synopsis
Issued at 313 pm edt Wed aug 21 2019
- a few showers and storm possible through early evening
- much cooler and drier air moves in tonight and Thursday
- mostly dry after tonight until early next week

Discussion (this evening through next Wednesday)
issued at 313 pm edt Wed aug 21 2019
the few showers, and possible storm that lingers into early this
evening will likely be the most interesting weather we will see
until next week. A quiet, cool, and much less humid air mass will
settle in over the area through the weekend.

Only a few showers have popped over the area this afternoon so far.

They will continue to be possible through about sunset, before any
instability dissipates, and the cold front currently across central
lower moves through. The instability has likely peaked already based
on the SPC meso page, with more stable lake air filtering in, and
some weak mid level ridging building in behind a weak wave that
moved through earlier.

There were some indications on previous model runs that some rain
showers could lift back in over the i-94 counties tonight. This
would have been the result of a wave moving along the front before
the front moved far enough south. The latest trends are that the
rain would stay south toward the state border, with drier air
filtering in keeping the rain south of i-94.

The chance of rain is not zero for Thursday and Friday, however the
chance is small enough to keep out of the forecast for now. There
will be a couple of decent short waves that will dive down to the se
downstream of the upper ridge to our west. The problem with these
short waves will be the very dry air mass advecting in, and lack of
cold enough air aloft to allow convection to occur. We do think that
there will be a fair amount of cumulus development Thu and fri, but
that will be about it.

The area will become under the influence of the decent upper ridge
for Sat and sun. This will clear things out, and moderate temps a
bit. Humidity will stay comfortable through Sunday.

The next chance of rain looks like it will likely hold off until
Monday. The upper ridge will move east of the area and weaken. This
will allow an upper trough move ese into the area, and also absorb a
wave to the SW to come NE toward the area. Moisture advection will
increase as the low level flow becomes southerly ahead of the
system. This front will bring the best chance of rain to the area
later Monday and tue. Another cooler air mass will then move in
behind this front for the mid portion of next week.

Aviation (for the 00z tafs through 00z Thursday evening)
issued at 751 pm edt Wed aug 21 2019
vfr weather expected to prevail next 24 hours - confidence is
high. Expect scattered to broken clouds around 5000-7000 ft, with
some higher clouds above 12,000 ft also around tonight. The
threat for fog stratus is much lower than previous nights since a
drier air mass is arriving tonight and the northerly sfc winds
stay up, at around 5-10 kts, keeping the boundary layer mixed.

Marine
Issued at 313 pm edt Wed aug 21 2019
we will see a brief increase in winds and waves this evening in the
wake of the front passing through. We continue to expect that we
should stay below criteria for a small craft advisory and beach
hazards statement.

It appears that we should stay below headline criteria for much of
the period through the weekend. High pressure will be in control,
with winds likely staying at or below 15 knots. Winds look like they
will start increasing a bit later Sunday into Monday as the next
system will approach the area at that time.

Grr watches warnings advisories
Mi... None.

Lm... None.

Synopsis... Njj
discussion... Njj
aviation... Meade
marine... Njj


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SVNM4 - South Haven, MI 1 mi32 min N 16 G 17 73°F
45168 3 mi32 min NNW 12 G 16 73°F 75°F2 ft1012.4 hPa67°F
SJOM4 - St. Joseph, MI 24 mi62 min WNW 8.9 G 13 76°F 1012.9 hPa (-2.0)
HLNM4 - 9087031 - Holland, MI 26 mi62 min N 6 G 6 73°F 1012 hPa (-1.5)67°F
45026 - St. Joseph, MI 34 mi32 min NW 12 G 16 76°F 76°F2 ft1012.2 hPa70°F
45029 35 mi32 min N 9.7 G 12 74°F 74°F2 ft1012.1 hPa64°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 44 mi32 min NNE 12 G 14 72°F 74°F1013.2 hPa67°F
MKGM4 - Muskegon, MI 57 mi32 min NE 6 G 7 72°F 1012.3 hPa61°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 mi67 minNNW 47.00 miMostly Cloudy74°F73°F100%1012.5 hPa
Southwest Michigan Regional Airport, MI20 mi69 minWNW 710.00 miMostly Cloudy76°F70°F82%1011.9 hPa

Link to 5 minute data for KLWA

Wind History from LWA (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW10W8W5W7W5W7SW7W4SW3NW3CalmN4
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3CalmCalmCalmSW4SW3W14
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2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW3W5NW3CalmCalmNW3Calm

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.