Monday, October21, 2019 L-36.com


Marine Weather and Tides
Grand Haven, MI

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
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 8:04AMSunset 6:54PM Monday October 21, 2019 3:08 AM EDT (07:08 UTC) Moonrise 12:00AMMoonset 2:28PM Illumination 49% Phase: Third Quarter Moon; Moon at 22 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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LMZ846 Holland To Grand Haven Mi- 1005 Pm Edt Sun Oct 20 2019
.gale warning in effect from Monday morning through Wednesday morning...
Rest of tonight..East winds 15 to 25 knots. Mostly cloudy. Areas of fog. Waves 1 to 2 feet.
Monday..Southeast winds 20 to 25 knots increasing to gales to 35 knots, then veering south to 30 knots late in the day. Rain showers and a slight chance of Thunderstorms. Waves 2 to 3 feet building to 4 to 6 feet.
Monday night..Southwest winds to 30 knots. Partly cloudy with a chance of rain showers. Waves 7 to 10 feet.
Tuesday..Southwest gales to 35 knots. Rain showers likely. Waves 10 to 14 feet.
Tuesday night..West gales to 35 knots toward daybreak. Partly cloudy with a chance of rain showers. Waves 8 to 12 feet.
Wednesday..West winds to 30 knots backing southwest 15 to 25 knots late in the day. Mostly Sunny. Waves 6 to 9 feet.
Thursday..Northwest winds 15 to 20 knots. Mostly cloudy. Waves 2 to 4 feet.
Friday..West winds 10 to 20 knots. Partly Sunny. Waves 2 to 3 feet.
LMZ846 Expires:201910210900;;024184 FZUS53 KGRR 210205 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 1005 PM EDT Sun Oct 20 2019 For waters within five nautical miles of shore on Lake Michigan LMZ846-210900-


7 Day Forecast for Marine Location Near Grand Haven, MI
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location: 43.05, -86.36     debug


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 210558
afdgrr
area forecast discussion
national weather service grand rapids mi
158 am edt Mon oct 21 2019
latest update...

aviation

Synopsis
Issued at 230 pm edt Sun oct 20 2019
- winds increase on Monday as fall storm approaches
- winds gusting over 35 mph on Tuesday with some coastal flooding
possible
- colder air for Wednesday to the end of the week

Update
Issued at 738 pm edt Sun oct 20 2019
close call for a wind advisory Monday afternoon. The combination
of a tightening pressure gradient and increasing mixing supports
wind making a run at 40 mph. We updated the hwo to reflect this
potential. Also westerly winds this evening have drawn some fog
onto the lakeshore. We added this to the forecast as well and the
hwo.

Discussion (this evening through next Sunday)
issued at 230 pm edt Sun oct 20 2019
deepening surface low tracking north of the great lakes will bring
some strong winds Monday into Tuesday night. Rainfall amounts
across our forecast area are not expected to be excessive as
convection across the ohio valley area limits moisture transport
into lower michigan.

The strongest winds are expected Tuesday afternoon as model wind
profiles show 35 to 40 knots in the mixing layer. Some coastal
flooding is possible in areas of coastline facing southwest.

The sfc low slowly fills as it becomes occluded with weakening sfc
pressure gradient and slackening winds on Wednesday. Warm
advection isentropic ascent in advance of another sfc low will
bring the chance of rain by late Wednesday night and Thursday.

There is enough cold air on the back side of the low to include
rain to snow mix Thursday night.

Colder air prevails for the end of the week into the weekend.

Aviation (for the 06z tafs through 06z Monday night)
issued at 155 am edt Mon oct 21 2019
fairly impactful aviation weather conditions are expected the next
24 hours. The main items of concern are strong winds today and a
push of MVFR ifr conditions through the area this afternoon. There
is a small chance for a few isolated thunderstorms this afternoon
as well, but left this out of the forecast at this point given the
small threat.

A cold front will push through the area this evening with a period
of stronger winds and lower ceilings ahead of the front today.

Winds will increase considerably late this morning, after 14z to
15z. Southeast winds will increase into the 15-30 knot range with
some higher gusts into the 30-40 knot range. The winds will turn
south and decrease a bit for this evening. Aloft, southeast winds
will be near 50 knots at 2,000ft creating some low level wind
shear.

As for the low clouds, expect MVFR clouds to invade the area
between 15z and 18z with ifr clouds moving through after 18z.

Visibilities will dip to 3-5 miles in rain showers.

Conditions should improve this evening as the low clouds are
scoured out after 00z and the winds decrease in speed for a brief
time.

Marine
Issued at 230 pm edt Sun oct 20 2019
expect a period of gales from Monday afternoon into Tuesday
night. Wind direction will be southeast on Monday going southwest
Monday night and continuing through Tuesday.

Grr watches warnings advisories
Mi... None.

Lm... Gale warning from 11 am this morning to 8 am edt Wednesday for
lmz844>849.

Update... Mjs
synopsis... Ostuno
discussion... Ostuno
aviation... Duke
marine... Ostuno


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
45161 9 mi68 min ESE 9.7 G 12 52°F 52°F1012.7 hPa (-1.3)
45029 11 mi28 min ENE 12 G 16 55°F 56°F1 ft1012 hPa49°F
MKGM4 - Muskegon, MI 12 mi28 min E 8.9 G 11 49°F 1013.1 hPa46°F
HLNM4 - 9087031 - Holland, MI 21 mi56 min E 6 G 8.9 50°F 59°F1011.9 hPa49°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 44 mi38 min E 14 G 18 55°F
45168 45 mi28 min NNE 14 G 16 54°F 58°F1 ft1011.7 hPa48°F
SVNM4 - South Haven, MI 45 mi38 min ENE 8 G 9.9 50°F
LDTM4 - 9087023 - Ludington, MI 62 mi56 min E 5.1 G 5.1 46°F 44°F

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muskegon, Muskegon County Airport, MI10 mi73 minESE 410.00 miOvercast47°F45°F93%1013.3 hPa

Link to 5 minute data for KMKG

Wind History from MKG (wind in knots)
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Last 24hrCalmCalmCalmNW3NW4NW7N4NW6NW5W4W7W6W6W6W4W5W4W3CalmNE3CalmCalmSE4E4
1 day agoSE10SE8SE8SE9SE7SE7SE11SE11SE8S10SE13SE12SE12SE9SE10SE6SE5SE7SE8SE7SE8SE7SE8S4
2 days agoCalmE3CalmSE3SE4E3E3SE5SE7SE8S8SW9S7SW8S6S3SE3E3E3SE8SE6SE6SE8SE8

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
GEOS 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 (3,6,7,8)
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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.