Wednesday, April8, 2020
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Marine Weather and Tides
Grand Haven, MI

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 7:11AMSunset 8:21PM Wednesday April 8, 2020 1:12 PM EDT (17:12 UTC) Moonrise 8:17PMMoonset 6:54AM Illumination 99% Phase: Full Moon; Moon at 16 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- 1130 Am Edt Wed Apr 8 2020
.dense fog advisory in effect until 8 pm edt this evening...
.gale watch in effect from Thursday morning through Friday morning...
Rest of today..West winds 10 to 15 knots. Rain showers. Areas of dense fog. Waves around 1 foot.
Tonight..Northwest winds 15 to 25 knots. Rain showers and a slight chance of Thunderstorms. Waves 2 to 3 feet building to 3 to 5 feet after midnight.
Thursday..Northwest winds to 30 knots. Partly Sunny. A chance of rain showers. Waves 6 to 9 feet.
Thursday night..Northwest winds to 30 knots increasing to gales to 35 knots late at night, then decreasing to 30 knots toward daybreak. Partly cloudy. Waves 6 to 9 feet.
Friday..Northwest winds to 30 knots becoming west 10 to 20 knots late in the day. Mostly Sunny. Waves 6 to 8 feet.
Saturday..Southwest winds 10 to 15 knots. Mostly cloudy with a chance of rain showers. Waves 1 to 2 feet.
Sunday..East winds around 15 knots backing northeast late in the day. Rain showers likely. Waves around 1 foot.
LMZ846 Expires:202004082100;;770863 FZUS53 KGRR 081530 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 1130 AM EDT Wed Apr 8 2020 For waters within five nautical miles of shore on Lake Michigan LMZ846-082100-


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 081542 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 1142 AM EDT Wed Apr 8 2020

LATEST UPDATE . Update

SYNOPSIS. Issued at 321 AM EDT Wed Apr 8 2020

- Showers late this afternoon and evening

- Very windy Thursday

- Much cooler late tonight through the weekend and next week

UPDATE. Issued at 1142 AM EDT Wed Apr 8 2020

We've extended/re-issued the marine dense fog advisory into this evening as coastal webcams show it persisting and it will probably take until the cold frontal passage this evening to fully blow it out. Fog and stratus will likely oscillate in and out of the coastal communities such as Ludington, Pentwater and Muskegon today.

Otherwise we have fog/stratus lifting over inland areas this morning, although some still lingers near and just south of GRR at 1130 am per vsbl satellite. Sunshine will be relatively short lived however as the next upstream wave spreads more clouds and showers into the area later today.

DISCUSSION. (Today through next Tuesday) Issued at 321 AM EDT Wed Apr 8 2020

-- Showers later today --

It will be partly sunny and seasonably mild today with high temperatures reaching the lower to middle 60’s. A strong cold front will bring showers late this afternoon and evening. Strong nw flow caa will occur after fropa and cause lingering light precipitation to potentially become mixed with a few wet snow flakes up north very late tonight.

-- Windy Thursday --

Wind gusts of 40 to 45 mph are expected Thursday with a strong pressure gradient in place by then. Mixed rain/snow showers are forecast due to instability from daytime heating and cold air aloft with the upper trough axis in place by tomorrow. Only a few tenths of an inch of snow are forecast Thursday through Thursday night.

-- Cool weather through the weekend into next week -–

A broad longwave trough will reestablish itself over our region next week and result in a prolonged period of significantly below normal temperatures. There is potential for a low pressure system over the Arklatex region to move northeast into our region by Sunday night and Monday bringing rain showers. Scattered snow showers are possible for the middle portion of next week as even colder air moves in.

AVIATION. (For the 12Z TAFS through 12Z Thursday morning) Issued at 734 AM EDT Wed Apr 8 2020

LIFR fog prevails in the I-69 area at 1130z. The dense fog was also noted along the lake shore near and west of US-31. MKG AND BIV have low clouds but only MVFR fog. The satellite image loops shows the clouds clearing from north to south, south of route 10. Thus the sun should mix the fog out by 14z to 15z. The glitch is high pressure is over the area so winds are light. That will retard the clearing of the fog some. In any event all TAF sites should be VFR by late morning.

The next frontal system will bring and area of rain to our TAF sites this evening. This will bring a period of MVFR clouds and rain. This time however we have much colder and dry air behind it so skies should clear after between 06z and 09z. It will get windy by midday Thursday.

MARINE. Issued at 321 AM EDT Wed Apr 8 2020

Winds and waves will become hazardous to small craft tonight and winds could reach gale force Thursday through Thursday night into early Friday. Some lakeshore flooding and beach erosion issues are possible Thursday and Thursday night as well.

I have extended the fog advisory into late morning since the it seems the fog will continue past sunrise. Web cams show the fog is still there and the nighttime microphysics image loops shows the fog expanding actually.

HYDROLOGY. Issued at 321 aM EDT Mon Apr 8 2020

a strong cold front will bring showers late this afternoon and evening. Mixed rain and snow showers will develop Thursday as much colder air moves in. The next chance for any significant precipitation will not come until Sunday night and Monday so no significant hydro issues are anticipated.

GRR WATCHES/WARNINGS/ADVISORIES. MI . None. LM . Dense Fog Advisory until 8 PM EDT this evening for LMZ844>849.

Gale Watch from Thursday morning through Friday morning for LMZ844>849.



UPDATE . Meade SYNOPSIS . Laurens DISCUSSION . Laurens AVIATION . WDM HYDROLOGY . Laurens MARINE . Laurens


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
45029 11 mi42 min 5.8 G 7.8 38°F 39°F1 ft1009.5 hPa36°F
MKGM4 - Muskegon, MI 12 mi32 min NW 2.9 G 4.1 41°F 1009.4 hPa41°F
HLNM4 - 9087031 - Holland, MI 21 mi66 min SW 7 G 8 39°F 46°F1008.6 hPa39°F
45168 45 mi42 min SSW 3.9 G 3.9 39°F 42°F1 ft1010.2 hPa36°F
SVNM4 - South Haven, MI 45 mi42 min SSW 5.1 G 6 39°F
LDTM4 - 9087023 - Ludington, MI 62 mi66 min SSW 6 G 8 40°F 40°F

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muskegon, Muskegon County Airport, MI10 mi17 minWNW 510.00 miOvercast55°F45°F69%1008.2 hPa

Link to 5 minute data for KMKG

Wind History from MKG (wind in knots)
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Last 24hrS11S12S15
G22
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S10W8NW6NW9NW10N7N8N5N7N4NE4CalmW4NW3W6S4W5NW5
1 day agoSW12SW9W73W3CalmCalmE3SE3CalmNE5NE4E5E4E9E7E7SE6SE5SE4SE6SW6SW7S6
2 days agoNE5W10W7W8W6W9NW4NW5CalmCalmCalmCalmCalmSE3CalmCalmCalmCalmSE3CalmS4SW8S10SW10

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 (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 numerous 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.