Tuesday, September26, 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 7:35AMSunset 7:34PM Tuesday September 26, 2017 1:56 PM EDT (17:56 UTC) Moonrise 12:46PMMoonset 10:41PM Illumination 35% Phase: Waxing Crescent; Moon at 6 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- 955 Am Edt Tue Sep 26 2017
Rest of today..Southwest winds around 10 knots. Mostly Sunny. Waves 1 foot or less.
Tonight..Southwest winds around 10 knots veering northwest 10 to 20 knots late at night, then increasing to 20 to 25 knots toward daybreak. Partly cloudy in the evening then becoming mostly cloudy. A slight chance of showers. Waves 1 to 2 feet building to 3 to 5 feet toward daybreak.
Wednesday..Northwest winds 20 to 25 knots. Mostly cloudy until midday then becoming mostly Sunny. Waves 4 to 6 feet.
Wednesday night..North winds 10 to 20 knots. Partly cloudy. Waves 3 to 5 feet.
LMZ844 Expires:201709262115;;960110 FZUS53 KGRR 261355 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 955 AM EDT Tue Sep 26 2017 For waters within five nautical miles of shore on Lake Michigan LMZ844-262115-

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 261753
afdgrr
area forecast discussion
national weather service grand rapids mi
153 pm edt Tue sep 26 2017
latest update...

aviation hydro

Synopsis
Issued at 325 am edt Tue sep 26 2017
one more day of record to near record highs in the upper 80s to
lower 90s. A cold front comes through the area early tonight with
only scattered showers and perhaps an isolated thunderstorm. This
will lower our high temperatures on Wednesday nearly 25 degrees
from todays values. This will only brings afternoon temperatures
to near normal values. A second cold front on Friday brings in
the truly cold air and lake enhanced rain showers near lake
michigan. Temperatures will by then be chilly. Another warming
trend follows by early next week.

Short term (today through Thursday)
issued at 325 am edt Tue sep 26 2017
the primary question for today is can we get any rain from the
frontal system tonight? It has been 17 days since grand rapids has
had measurable rainfall so we can use the rain. However the way
the front comes through it is really questionable if much in the
way of significant rainfall will occur with this front tonight.

As I have been saying the past few days the upper trough that
pushes the cold front through is actually being sheared out by an
upstream pacific system. The problem is the longwave upper ridge
is still actually in place. So most of the dynamic energy goes
well north into southern canada with this frontal system. The
focus of the 1000 850 moisture transport is over upper michigan
into ontario north of lake huron. The axis of the low level jet is
actually north of us as the front comes through and has nearly
always been the case this year we are in the speed divergence
area of the low level jet (not a good place for significant
convection). Also model sounding show CAPE is limited at best.

There are three things through that none the less favor some
showers, we do get into the right entrance region of the jet
overnight, precipitable water is near 1.75 inches, much above
normal, and there is upper divergence over surface convergence.

So I have increased the pop tonight by about 10 percent do not
expect a widespread rain event with this front.

Behind the front Wednesday into Thursday we have shallow cold air
so expect much cooler temperatures and partly cloudy skies.

Long term (Thursday night through Monday)
issued at 325 am edt Tue sep 26 2017
another surge of chilly air will be pushing in with an upper short
wave by Friday. This feature will also bring a decent chance of
showers mostly late Thursday night into Friday morning. Some rain
is better than nothing, but it appears a quarter inch of less will
come with this system.

The chilly air, and slightly below normal temps, that moves in on
Friday will linger through the weekend with daytime highs holding in
the 60s, and nighttime lows inland in the upper 30s to lower 40s.

Some patchy frost will be possible both Friday and Saturday nights.

Warm advection commences Sunday night and into Monday as we see
surface and upper ridging sliding in. Highs should be back to a bit
above normal into the 70s for Monday. It should remain dry Friday
night through Monday with the ridging taking back over.

Aviation (for the 18z tafs through 18z Wednesday afternoon)
issued at 153 pm edt Tue sep 26 2017
winds will shift west-northwest with a cold front tonight between
02z at mkg and 07z at jxn. Gusts 15 to 20kt are possible behind
this front. Scattered showers and an isolated thunderstorm may
also develop in proximity to this front. The greatest chance of
rain and thunder will exist at locations farther west e.G. Mkg.

Expecting low stratus clouds to develop behind the cold front
overnight, continuing through morning. Ceilings will be MVFR but
could dip into ifr.

Marine
Issued at 325 am edt Tue sep 26 2017
small craft advisories will likely be needed Wednesday as north
winds of 15 to 25 knots build waves to as high as 6 feet.

Hydrology
Issued at 153 pm edt Tue sep 26 2017
low river flows will continue across west michigan through at
least the upcoming weekend. Rain will be a possibility tonight
and again Thursday night into Friday. Precipitation amounts will
be generally one quarter inch or less tonight... With one tenth to
one quarter of an inch expected for the Thursday night Friday
event. These will not cause impactful rises in area rivers.

Grr watches warnings advisories
Mi... None.

Lm... None.

Synopsis... Wdm
short term... Wdm
long term... Jk
aviation... Cas
hydrology... Mws
marine... Wdm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SVNM4 - South Haven, MI 1 mi27 min S 8 G 8 74°F
45168 3 mi17 min SSW 7.8 G 9.7 74°F 72°F1 ft1014.6 hPa64°F
SJOM4 - St. Joseph, MI 24 mi57 min SSW 8.9 G 11 79°F 1015.6 hPa (+0.4)
HLNM4 - 9087031 - Holland, MI 26 mi39 min S 8.9 G 9.9 73°F 1014.5 hPa
45026 - St. Joseph, MI 34 mi17 min W 1.9 G 3.9 76°F 73°F1 ft1014.5 hPa65°F
45029 35 mi17 min SSW 7.8 G 9.7 72°F 70°F1 ft1014.3 hPa65°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 44 mi67 min SSE 7.8 G 9.7 72°F 71°F1 ft1014.1 hPa (+0.0)
MKGM4 - Muskegon, MI 57 mi27 min S 9.9 G 13 77°F 1013.8 hPa68°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 mi61 minSW 610.00 miFair86°F60°F42%1015.2 hPa
Southwest Michigan Regional Airport, MI20 mi64 minWSW 910.00 miFair87°F60°F40%1014.7 hPa

Wind History from BEH (wind in knots)
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Last 24hrCalmCalmSE8S7SE3SE3CalmCalmCalmCalmCalmCalmCalmCalmE3CalmSE3CalmCalmSE4S3SW4SW8SW9
1 day agoSE7SE7S7
G16
SE10SE6SE5CalmE3E3E3CalmCalmE4SE5SE5SE6SE5SE3CalmSE3S5S4S5SE4
2 days agoE4NW6NW6N4NW3CalmCalmCalmE3SE5SE3E3CalmE4E5E4E5SE3E4SE5SE4SE4SE7S8

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 (13,3,4,5)
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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.