Wednesday, July17, 2019 L-36.com


Marine Weather and Tides
South Haven, MI

Version 3.4
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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 6:19AMSunset 9:21PM Wednesday July 17, 2019 6:44 AM EDT (10:44 UTC) Moonrise 9:07PMMoonset 5:55AM Illumination 100% Phase: Full Moon; Moon at 15 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 Am Edt Wed Jul 17 2019
Early this morning..North winds around 5 knots. Partly cloudy. Patchy fog. Waves less than 1 foot.
Today..North winds 5 to 10 knots backing northwest. Mostly Sunny. Waves less than 1 foot.
Tonight..Northeast winds around 5 knots veering south 5 to 15 knots after midnight. Partly cloudy. Waves 1 foot or less.
Thursday..Southwest winds 10 to 20 knots. Mostly Sunny with a chance of showers and Thunderstorms. Waves 2 to 3 feet.
Thursday night..Southwest winds 15 to 20 knots. Partly cloudy with a slight chance of showers and Thunderstorms. Waves 2 to 3 feet.
Friday..Southwest winds 15 to 20 knots. Sunny. Waves 2 to 4 feet.
Saturday..West winds 10 to 15 knots. Mostly Sunny. Waves 1 to 3 feet.
Sunday..North winds 5 to 10 knots backing west, then veering north late in the day. Partly Sunny. Waves around 1 foot.
LMZ844 Expires:201907172000;;769511 FZUS53 KGRR 170805 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 405 AM EDT Wed Jul 17 2019 For waters within five nautical miles of shore on Lake Michigan LMZ844-172000-


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 170723
afdgrr
area forecast discussion
national weather service grand rapids mi
323 am edt Wed jul 17 2019
latest update...

synopsis discussion marine

Synopsis
Issued at 315 am edt Wed jul 17 2019
- risk for severe storms very late tonight through Thursday night
into Friday
- excessive heat likely Thursday through Saturday into early Sunday

Discussion (today through next Tuesday)
issued at 315 am edt Wed jul 17 2019
primary short term fcst concerns involve assessment of
convective svr wx potential late tonight through Thursday night
into Friday and excessive heat concerns Thursday through at least
Saturday.

Fair and very warm and humid wx is fcst for the vast majority of
our fcst area with high temps well into the 80s and dew points
mainly in the upper 60s to lower 70s. Most of the day will be dry
but there is a small chc for a popup shower or storm due to lake
breeze convergence and building instability from heating later
today. The us-131 corridor looks most favored for the stronger sfc
convergence and possibly a few showers or storms later today.

An MCS will approach our area from the wnw late tonight fueled by
the LLJ and instability. The severe wx threat will most likely
stay to our west tonight but the diminishing MCS could still
bring some briefly gusty winds and heavy rain late tonight into
Thursday morning. I would not completely discount potential for
severe wx early Thursday morning as the MCS remnants of the mcs
roll in depending on how well organized the MCS becomes.

As instability ramps back up later Thursday and Thursday night
one or several more rounds of convection are expected. Strong to
severe storms are possible with potentially strong instability
developing Thursday aftn evening (sb CAPE values potentially
reaching at least 3000 j kg) in conjunction with favorable (30-40
kts) deep layer shear for organized convection.

Relatively warm temps aloft should cap potential for convection
Friday. Excessive heat and humidity is forecast Thursday through
at least Saturday with high temperatures well into the 90s daily
and heat indices well into the hundreds.

Aviation (for the 06z tafs through 06z Wednesday night)
issued at 1156 pm edt Tue jul 16 2019
patchy fog will develop during the early morning hours today and
cause reductions to MVFR ifr or lower during the early to mid
morning hours until patchy fog dissipates. However some MVFR
conditions may still linger late morning into early afternoon due
to lingering low cloud cover before conditions finally improve to
vfr.

Marine
Issued at 315 am edt Wed jul 17 2019
fairly minimal wind speeds and wave heights are forecast midweek
but patchy fog may pose a hazard to mariners from time to time
through late this week. In addition thunderstorms will pose a
hazard to mariners late tonight through Thursday night.

Grr watches warnings advisories
Mi... None.

Lm... None.

Synopsis... Laurens
discussion... Laurens
aviation... Laurens
marine... Laurens


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SVNM4 - South Haven, MI 1 mi45 min NNW 2.9 G 4.1 74°F
45168 3 mi35 min NNW 5.8 G 7.8 73°F 74°F1011.8 hPa70°F
SJOM4 - St. Joseph, MI 24 mi45 min W 2.9 G 4.1 75°F 1013.2 hPa (+0.7)
HLNM4 - 9087031 - Holland, MI 26 mi63 min N 4.1 G 6 73°F 76°F1011.6 hPa70°F
45026 - St. Joseph, MI 34 mi35 min WNW 5.8 G 7.8 74°F 76°F1011.7 hPa71°F
45029 35 mi35 min ENE 5.8 G 5.8 71°F 72°F1011.8 hPa69°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 44 mi35 min NE 1.9 G 1.9 69°F 70°F1012.3 hPa69°F
MKGM4 - Muskegon, MI 57 mi35 min ENE 5.1 G 5.1 70°F 1012 hPa70°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 mi49 minN 07.00 miOvercast71°F69°F97%1012.2 hPa
Southwest Michigan Regional Airport, MI20 mi52 minN 08.00 miOvercast74°F72°F94%1011.5 hPa

Wind History from BEH (wind in knots)
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Last 24hrSE4S5S8S7S5S9SW7NW7W8W8NW5W4W4NW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoSW4SW4W12W11W10W10
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SW10SW7SW4CalmCalmS3SW5SW7S7
2 days agoCalmE4E5E7SE7SE3Calm3N56NE55NE3CalmCalmCalmE3CalmSE3SE6SE4S3CalmS3

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.
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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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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.