Sunday, August18, 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 6:52AMSunset 8:44PM Sunday August 18, 2019 4:09 AM EDT (08:09 UTC) Moonrise 9:33PMMoonset 8:42AM Illumination 92% Phase: Waning Gibbous; Moon at 17 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- 336 Am Edt Sun Aug 18 2019
Today..Southwest winds 10 to 20 knots. Mostly cloudy with a chance of rain showers and a slight chance of Thunderstorms. Waves 2 to 3 feet.
Tonight..Southwest winds 10 to 15 knots veering west toward daybreak. Partly cloudy with a chance of showers and Thunderstorms. Waves 1 to 3 feet.
Monday..North winds around 10 knots. Sunny. Waves 1 to 2 feet.
Monday night..Northeast winds 5 to 10 knots veering east after midnight. Mostly clear. Waves around 1 foot.
Tuesday..Southeast winds around 5 knots veering southwest. Sunny with a chance of rain showers and a slight chance of Thunderstorms. Waves less than 1 foot.
Wednesday..Northwest winds 10 to 15 knots. Partly Sunny. Waves 1 to 3 feet.
Thursday..North winds 5 to 10 knots increasing to 10 to 15 knots. Sunny. Waves around 1 foot.
LMZ844 Expires:201908182015;;816049 FZUS53 KGRR 180736 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 336 AM EDT Sun Aug 18 2019 For waters within five nautical miles of shore on Lake Michigan LMZ844-182015-


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 180730
afdgrr
area forecast discussion
national weather service grand rapids mi
330 am edt Sun aug 18 2019
latest update...

synopsis discussion marine

Synopsis
Issued at 330 am edt Sun aug 18 2019
- strong to severe storms very late this morning afternoon
- dangerous swimming conditions later today
- a cold front will bring another chance for storms Tuesday night
- seasonably cooler temperatures late in the week

Discussion (today through next Saturday)
issued at 330 am edt Sun aug 18 2019
primary fcst concerns involve assessment of convective svr wx
potential today.

A consensus of latest cams and SPC href members suggests that a
line of convection will move through our fcst area very late this
morning through mid aftn (from roughly 15z-19z). This convective
timing is several hours slower than higher resolution model
guidance runs indicated yesterday.

An upgrade to a slight risk was coordinated with SPC dtx iwx for
roughly the SE half of our fcst area. This slower timing will
allow greater instability to potentially develop before the
convection moves in around or shortly after midday. IR Sat trends
early this morning also support this notion with extensive
clearing noted across eastern wi northeast il. Sb CAPE values
will likely reach around 2000 j kg and bulk shear values of up to
30-35 kts will be supportive of some organized convection early to
mid aftn. Severe storms could bring damaging wind gusts and large
hail and perhaps an isolated tornado.

The latest runs of the hrrr and several href members suggest that
this round of convection from late morning through mid afternoon
will be the main (and only) round of convection for our area.

This since the airmass will be worked over once this batch of rain
and storms moves through. However we cannot rule out potential
for scattered additional storms to develop prior to fropa.

Otherwise to start the day patchy fog will continue to develop
early this morning particularly in areas where it rained yesterday
evening and near lake mi. Fair wx will return late tonight
through Monday into Tuesday as a high pressure ridge gradually
builds in. Another cold front will bring potential for showers and
storms late Tuesday Tuesday night. A relatively cooler and drier
airmass will advect in late this week.

Aviation (for the 00z tafs through 00z Sunday evening)
issued at 1155 pm edt Sat aug 17 2019
showers will dissipate overnight and there is potential for some
fog and stratus. Some stratus and fog formation is possible
during the early morning hours Sunday which will result in mainly
MVFR conditions with some ifr possible.

A round of rain and thunderstorms will move through from west to
east on Sunday from roughly 15z to 19z and could cause brief
reductions to ifr lifr. Winds will become gusty out of the
southwest in the afternoon before subsiding Sunday evening.

Marine
Issued at 330 am edt Sun aug 18 2019
winds and waves today will reach small craft advisory levels as sw
winds ramp up to 15 to 25 knots resulting in 3 to 5 foot waves
from near biv northward. Winds and waves will increase in the
morning resulting in longshore currents and waves topping piers
given the high water levels. In addition to a small craft advisory
a beach hazard statement will also remain in effect for today.

Calmer conditions are expected early next week.

Grr watches warnings advisories
Mi... Beach hazards statement from 10 am edt this morning through this
evening for miz037-043-050-056.

Lm... Small craft advisory from 8 am this morning to 8 pm edt this
evening for lmz846>849.

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 mi40 min SE 5.1 G 5.1 71°F
45168 3 mi30 min SE 7.8 G 9.7 73°F 74°F1 ft1011.1 hPa68°F
SJOM4 - St. Joseph, MI 24 mi70 min S 1.9 G 6 70°F 1012.2 hPa (-1.3)
HLNM4 - 9087031 - Holland, MI 26 mi58 min SSE 7 G 8 72°F 1011 hPa70°F
45026 - St. Joseph, MI 34 mi30 min S 9.7 G 12 73°F 75°F1 ft1011.4 hPa67°F
45029 35 mi30 min S 5.8 G 5.8 70°F 67°F1010.8 hPa67°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 44 mi40 min S 5.8 G 5.8 73°F 73°F1010.9 hPa71°F
MKGM4 - Muskegon, MI 57 mi30 min S 7 G 8 70°F 1010.5 hPa67°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 mi95 minN 02.50 miFog/Mist67°F66°F100%1012.5 hPa
Southwest Michigan Regional Airport, MI20 mi2.3 hrsS 35.00 miFog/Mist68°F66°F93%1012 hPa

Link to 5 minute data for KBEH

Wind History from BEH (wind in knots)
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Last 24hrCalm--CalmCalmCalm--CalmW5CalmCalmW5E4CalmCalmCalmCalmW5SW4CalmSE3S4CalmS3Calm
1 day ago------SE3------S7S5S7
G17
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--S8S9--NE63--N6--E3
2 days agoE5CalmCalmE6E6E6E3CalmN4NW6NW94
G19
65N6--CalmCalm--CalmCalmCalmCalm--

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 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 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.