Saturday, September23, 2017 L-36.com


Marine Weather and Tides
Fennville, 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 7:32AMSunset 7:40PM Saturday September 23, 2017 2:16 PM EDT (18:16 UTC) Moonrise 9:54AMMoonset 8:49PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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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LMZ845 South Haven To Holland Mi- 944 Am Edt Sat Sep 23 2017
Rest of today..Southwest winds 5 to 10 knots veering northwest late in the day. Partly Sunny. Waves less than 1 foot.
Tonight..East winds 5 to 10 knots veering southeast after midnight. Clear. Waves less than 1 foot.
Sunday..Southeast winds around 10 knots veering south, then veering northwest late in the day. Sunny. Waves less than 1 foot.
Sunday night..East winds 5 to 10 knots veering southeast after midnight. Clear. Waves less than 1 foot.
LMZ845 Expires:201709232115;;812187 FZUS53 KGRR 231344 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 944 AM EDT Sat Sep 23 2017 For waters within five nautical miles of shore on Lake Michigan LMZ845-232115-

7 Day Forecast for Marine Location Near Fennville, MI
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location: 42.65, -86.09     debug


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 231735
afdgrr
area forecast discussion
national weather service grand rapids mi
135 pm edt Sat sep 23 2017
latest update...

aviation

Synopsis
Issued at 329 am edt Sat sep 23 2017
hot and humid weather will continue into Tuesday before
a cold front comes through the area on Wednesday bringing
in cooler air. A stronger cold front will bring showers
and thunderstorms with much cooler air in Thursday into
Friday.

Short term (today through Monday)
issued at 329 am edt Sat sep 23 2017
the primary issue will be the heat and humidity into Monday.

With a building upper level high over the area, I expect little
in the way of cloud cover and no change in airmass through Monday
so what we had the past two days should continue into Monday. The
models continue to show the 1000 925 and 1000 850 thickness just
as warm this afternoon as the past two afternoons so no reason to
believe it will be any cooler. Thus expect highs in the lower to
mid 90s and heat index values between 95 and 100 degrees this
afternoon.

The models do show a slow cooling trend starting Sunday but with
the upper high holding as it does the cooling seems questionable.

As a result I kept highs significantly warmer than any of our mos
output would suggest. Highs will stay in the lower to mid 90s
Sunday and Monday.

The upper level high will result in enough subsidence at mid
levels so that convection in the afternoon should be suppressed.

Even so I have 5 to 10 pct pop inland of us-131 just in case.

Long term (Monday night through Friday)
issued at 329 am edt Sat sep 23 2017
the upper high will slowly drift to the east by Tuesday. This will
let a weak front to move into SW mi. Not much moisture with the
front as the upper high will still prevent any gulf moisture to be
entrained. It seems that we will only see very hit and miss
showers storms with the front given this lack of moisture. One more
hot day on Tuesday, then we chill down.

A more zonal flow develops by Wed wed night, while we see northerly
low level flow develop in the wake of the weak front. Some timing
differences with the front, but temps should turn some 10 to 15
degrees cooler in this period.

We should continue to see progressively cooler temps into the latter
portion of the week. By Thu Fri an upper trough deepens over the
great lakes. And along with a persistent northerly flow in the low
levels, h8 temps fall to around +2c by Friday. Highs by Friday
should only be in the lower 60s. The upper trough will also bring
the best chance of rain in the extended period, with showers
arriving Thu night and lasting into Friday morning.

Aviation (for the 18z tafs through 18z Sunday afternoon)
issued at 135 pm edt Sat sep 23 2017
vfr weather will prevail the next 24-36 hours. There is a very low
risk of an inland shower or storm this afternoon, but confidence
is too low to have anything in the tafs. Can't rule out some
patchy fog late tonight but it seems that threat is also too
limited to have in the tafs.

Marine
Issued at 329 am edt Sat sep 23 2017
high pressure will result in light winds and mostly clear skies so
i see no marine issues till the cold front gets closer to the area
the middle of next week.

Hydrology
Issued at 1131 am edt Sat sep 23 2017
rivers are running around normal to below normal for the time of
year. Meanwhile, the us drought monitor is indicating dry conditions
across southern lower michigan. Near-record warmth is expected today
through Monday. The next good chance for rain is Wednesday. No river
issues are expected through the week.

Grr watches warnings advisories
Mi... None.

Lm... None.

Synopsis... Wdm
short term... Wdm
long term... Jk
aviation... Meade
hydrology... 63
marine... Wdm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HLNM4 - 9087031 - Holland, MI 11 mi46 min W 1.9 G 2.9 75°F 1019.6 hPa
SVNM4 - South Haven, MI 20 mi36 min N 2.9 G 4.1 81°F
45029 20 mi26 min SW 1.9 G 1.9 74°F 71°F1 ft1019.6 hPa67°F
45168 22 mi26 min NW 5.8 G 7.8 77°F 73°F1 ft1019.3 hPa68°F
45161 39 mi36 min SE 3.9 G 5.8 73°F 70°F1020.1 hPa
MKGM4 - Muskegon, MI 42 mi26 min S 8.9 G 11 79°F 1019.3 hPa69°F
SJOM4 - St. Joseph, MI 44 mi76 min N 2.9 G 4.1 80°F 1021 hPa

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Holland - West Michigan Regional Airport, MI7 mi23 minNW 710.00 miFair91°F64°F42%1019.4 hPa
South Haven, South Haven Area Regional Airport, MI22 mi19 minWNW 510.00 miFair92°F60°F36%1019.6 hPa

Wind History from BIV (wind in knots)
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Last 24hrSW6W7SW7W6W5W4CalmCalmCalmCalmCalmS3CalmCalmSE3S4CalmS3S3S3S3W6S53
1 day agoW6SW5544CalmCalmE5SE6SE5S5S6S5S3CalmCalmS4SE3CalmS4S5SW5W6SW8
2 days ago5S9S8SE11S11S9SE6SE7S7S6S3S5S4CalmCalmSE4SE6S3SE3CalmSE3W6SW83

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 (14,3,4,5)
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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.