Monday, May29, 2017 L-36.com


Marine Weather and Tides
Roosevelt Park, MI

Version 3.4
What's New / NOTES
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 6:07AMSunset 9:18PM Monday May 29, 2017 1:05 PM EDT (17:05 UTC) Moonrise 9:19AMMoonset 12:00AM Illumination 18% Phase: Waxing Crescent; Moon at 4 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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LMZ847 Grand Haven To Whitehall Mi- 1136 Am Edt Mon May 29 2017
Rest of today..Southwest winds 15 to 20 knots. Mostly Sunny. A slight chance of showers and Thunderstorms in the afternoon. Waves 1 to 2 feet.
Tonight..West winds 15 to 20 knots. Partly cloudy. A slight chance of showers and Thunderstorms in the evening. Waves 2 to 3 feet.
Tuesday..Southwest winds 15 to 20 knots. Partly Sunny. A chance of showers in the afternoon. Waves 2 to 3 feet.
Tuesday night..West winds 10 to 15 knots. Partly cloudy. A chance of showers in the evening. Waves 1 to 2 feet.
LMZ847 Expires:201705292115;;402468 FZUS53 KGRR 291536 NSHGRR NEARSHORE MARINE FORECAST NATIONAL WEATHER SERVICE GRAND RAPIDS MI 1136 AM EDT MON MAY 29 2017 FOR WATERS WITHIN FIVE NAUTICAL MILES OF SHORE ON LAKE MICHIGAN LMZ847-292115-

7 Day Forecast for Marine Location Near Roosevelt Park, MI
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location: 43.22, -86.36     debug


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 291520
afdgrr
area forecast discussion
national weather service grand rapids mi
1120 am edt Mon may 29 2017
latest update...

update

Synopsis
Issued at 330 am edt Mon may 29 2017
we will see another day with highs in the 70s on memorial day with
some scattered showers and isolated thunderstorms this afternoon and
evening. Coverage on the precipitation will not be widespread. An
upper low located over the northern great lakes will bring a fair
amount of cloud cover for Tuesday into Wednesday with isolated to
scattered showers at times both days. Highs on Tuesday and Wednesday
will cool into the 60s, which is below normal for this time of year.

Update
Issued at 1120 am edt Mon may 29 2017
reduced pops slightly, to 20% everywhere but the far NW cwa, near
ludington, where I kept 30 pops. Model soundings have come in dry
in the low levels, with mainly moisture above 5k feet. So expect
we will see diurnal clouds develop, but these will be fairly high
based. Some of the less vigorous afternoon showers may only be
virga, and those that do precipitate to the ground should be
isolated.

Left thunder in the forecast however. Due to the inverted v shaped
soundings, any storms that do form will likely produce brief gusty
winds to around 50 mph. The synoptic wind will also pick up this
afternoon, occasionally gusting to 30 mph.

Short term (today through Wednesday)
issued at 330 am edt Mon may 29 2017
main forecast focus in the short term in on cloud cover trends and
chances for showers and a few thunderstorms.

The great lakes region will be under the influence of an upper low
that will spin across the northern great lakes throughout the short
term. We are expecting precipitation at times through Wednesday
focused with upper shortwave troughs pivoting around the upper low.

Precipitation will be diurnally forced, with the bulk occurring in
the afternoon and evening hours the next few days. Simulated
reflectivity from the convection allowing models show the diurnal
trend as well. Best instability will be today with some lingering
low level moisture. Have showers and storms in the forecast for this
afternoon, but nothing more than scattered pops (30 pct). After this
evening just have isolated to scattered rain showers and left out
the mention of thunder as instability is forecast to be much less.

There will be a decent amount of sunshine today, especially from the
morning into the early afternoon. Clouds will become more prevalent
especially from tonight through Wednesday morning.

High temperatures will cool a bit each day early this week with
below normal highs in the 60s expected on Tuesday and Wednesday.

Long term (Wednesday night through Sunday)
issued at 330 am edt Mon may 29 2017
a warm front lifting north across the southern CWA will likely
produce showers storms Thursday night and Friday. The best
instability is confined to areas south of i-94.

Forecast confidence next weekend is low due to quite a bit of model
spread. The major models generally show sfc high pressure building
south toward the great lakes, but also some troughiness aloft. By
Sunday the GFS shows a low moving from manitoba southeast toward
chicago which would bring some rain toward southwest lower mi, but
the ECMWF doesn't show any low. The canadian on the other hand
strongly supports the GFS so that's which way the forecast will lean
for now. We'll include a chance of scattered rain showers late
Saturday into Sunday.

Highs will be a bit cooler than normal... A couple of degrees either
side of 70.

Aviation (for the 12z tafs through 12z Tuesday morning)
issued at 746 am edt Mon may 29 2017
vfr conditions are expected the next 24 hours. Scattered to broken
cumulus clouds will develop today with bases around 5000ft. The
clouds should thicken tonight with broken ceilings around 5000ft
becoming more prevalent. A few showers and an isolated
thunderstorms will be possible this afternoon and evening, however
latest guidance is indicating that we may stay dry at the taf
sites.

Winds will be gusty from the west southwest today at 12-25 knots.

Marine
Issued at 330 am edt Mon may 29 2017
westerly winds are expected for much of the next couple of days with
an upper low spinning across the northern great lakes. Winds are
generally expected to be in the 10 to 20 knot range which should
keep waves below advisory criteria. 25 knot winds are located in the
1000-2000ft range though so we will need to keep an eye on the
forecast in case the winds over perform.

Hydrology
Issued at 1236 pm edt Sun may 28 2017
not expecting any significant impacts from thunderstorm activity
today or showers on memorial day. While some rivers in the
kalamazoo river basin may be running above normal this week, many
rivers will likely run near normal. Any rises should be well
within banks. No flooding is anticipated.

Grr watches warnings advisories
Mi... None.

Lm... None.

Update... Jk
synopsis... Duke
short term... Duke
long term... 04
aviation... Duke
hydrology... Hoving
marine... Duke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MKGM4 - Muskegon, MI 1 mi35 min SW 5.1 G 7 59°F 1008.6 hPa50°F
45161 3 mi45 min SW 7.8 G 12 56°F 54°F2 ft1008.6 hPa
45029 23 mi25 min S 7.8 G 9.7 56°F 55°F2 ft1009.2 hPa50°F
HLNM4 - 9087031 - Holland, MI 32 mi47 min S 9.9 G 12 58°F
LDTM4 - 9087023 - Ludington, MI 50 mi47 min SSW 13 G 16 58°F 49°F

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muskegon, Muskegon County Airport, MI6 mi70 minW 610.00 miMostly Cloudy64°F46°F54%1008.5 hPa

Wind History from MKG (wind in knots)
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Last 24hrNE6CalmSW9W9W8SW7SW5SW5S4S6SW6SW3CalmSW4CalmW7W8W6SW10
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1 day agoSW8W11W11W9W4W6NW5CalmCalmCalmCalmCalmCalmCalmSE5SE4SE3SE6SE6S9SE5S5W15
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2 days agoSW6SW9SW10N5SW13
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NW4NW3CalmCalmSE4CalmCalmNE3CalmE3CalmN3N3NE4E3CalmSW4SW7SW9

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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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.