Friday, August7, 2020
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Marine Weather and Tides
Fennville, 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 6:41AMSunset 8:58PM Friday August 7, 2020 3:04 PM EDT (19:04 UTC) Moonrise 10:17PMMoonset 9:32AM Illumination 85% Phase: Waning Gibbous; Moon at 18 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- 1105 Am Edt Fri Aug 7 2020
Rest of today..Southwest winds 5 to 10 knots veering northwest late in the day. Sunny. Waves less than 1 foot.
Tonight..Northeast winds around 5 knots veering southeast after midnight. Clear. Waves less than 1 foot.
Saturday..Southwest winds 10 to 15 knots. Sunny. Waves around 1 foot.
Saturday night..South winds 10 to 15 knots. Partly cloudy. Waves 1 to 3 feet.
Sunday..Southwest winds 10 to 15 knots. Mostly Sunny with a slight chance of showers and Thunderstorms. Waves 1 to 3 feet.
Monday..Southwest winds 10 to 20 knots. Partly Sunny with a chance of showers and Thunderstorms. Waves 1 to 3 feet.
Tuesday..Northwest winds 10 to 15 knots. Sunny. Waves around 1 foot.
LMZ845 Expires:202008072100;;076768 FZUS53 KGRR 071506 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 1105 AM EDT Fri Aug 7 2020 For waters within five nautical miles of shore on Lake Michigan LMZ845-072100-


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 071708 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 108 PM EDT Fri Aug 7 2020

LATEST UPDATE . Aviation

SYNOPSIS. Issued at 323 AM EDT Fri Aug 7 2020

- Dry and increasingly warmer through Saturday

- Multiple storm chances Saturday night through Monday night

- Warm and dry much of next week

DISCUSSION. (Today through next Thursday) Issued at 323 AM EDT Fri Aug 7 2020

-- Dry and increasingly warmer through Saturday --

There really continues to be little to no change in the forecast for much of the period. We are starting out with high pressure at the sfc centered right over the state. This high will keep humid levels down for the next couple of days with a dry air mass in place. Temperatures will continue to moderate a little today, and again tomorrow, after the much cooler weather from earlier this week.

-- Multiple storm chances Saturday night through Monday night --

The period from early Sunday morning through Monday night will be potentially a bit unsettled with multiple chances of showers and storms.

The first chance will arrive late Saturday night/Sunday morning. This chance will be associated with a short wave that will be passing through the area from west to east. A bit of a low level jet ahead of it, and the short wave itself will provide the forcing to generate some showers and storms. This does not look to be a real good chance at this time due to the initial dry and stable atmosphere, diminishing instability, and unfavorable placement of the low level jet being aimed more north of the area.

The next better chance of rain in this period then looks to come through late Sunday night and Monday morning. Models generate a MCS well to our west with a strengthening low level jet. This does look to make its way toward the area by sunrise Monday morning, but likely in a decaying stage as the low level jet weakens.

Things become a bit more uncertain then with regard to storm chances, as previous storms will tend to dictate where future storms generate and move. If the decaying line does indeed come in Monday morning, this could stabilize the atmosphere on Monday. The cold front is expected to push through on Monday night, but would not have a lot of instability to fuel storms here. The favored areas would be well east of here with the low level jet, and south of here with more unstable conditions.

-- Warm and dry much of next week --

Once the front moves through by Tuesday morning, Canadian high pressure will build in from the north. The air under this is not that much cooler, but the moisture would be swept out and a dry flow of air will set up. This would help to prevent much of any precipitation until we can get some stronger forcing back in over the area. The latest Euro is trying to do that on Thu as a trough digs, and lifts a sfc low toward the area. This scenario is still in a bit of a state of flux, so we will watch the trends for later next week.

AVIATION. (For the 18Z TAFS through 18Z Saturday afternoon) Issued at 106 PM EDT Fri Aug 7 2020

Some scattered cu will develop this afternoon but dissipate with sunset. Clear skies expected overnight.

MARINE. Issued at 323 AM EDT Fri Aug 7 2020

No real concerns for marine interests through the first portion of Saturday. High pressure will slowly move east of the area through Saturday. This will keep winds on the lighter side.

Winds will start to come up a bit late Saturday up north. They will be up and down through early Tuesday with multiple waves of low pressure and possible thunderstorms moving through. We expect that a Small Craft Advisory and a Beach Hazards Statement will be needed at some point. It is still too early and uncertain to issue for the time being.

GRR WATCHES/WARNINGS/ADVISORIES. MI . None. LM . Small Craft Advisory from noon Saturday to 6 AM EDT Sunday for LMZ848-849.



SYNOPSIS . NJJ DISCUSSION . NJJ AVIATION . 04 MARINE . NJJ


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HLNM4 - 9087031 - Holland, MI 11 mi47 min W 8 G 9.9 71°F 67°F1021.1 hPa61°F
45029 20 mi15 min WNW 3.9 G 5.8 67°F 62°F1021.2 hPa60°F
SVNM4 - South Haven, MI 20 mi35 min W 8.9 G 8.9 72°F
45168 22 mi15 min W 5.8 G 7.8 74°F 75°F1 ft1021.2 hPa59°F
45161 40 mi25 min W 3.9 G 3.9 68°F 62°F1021.4 hPa
MKGM4 - Muskegon, MI 42 mi25 min WNW 6 G 6 71°F 1021.3 hPa62°F
SJOM4 - St. Joseph, MI 44 mi65 min NNW 4.1 G 5.1 75°F 1022.7 hPa (-0.3)

Wind History for Holland, MI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Holland - West Michigan Regional Airport, MI7 mi72 minSSE 610.00 miFair81°F48°F33%1021.9 hPa
South Haven, South Haven Area Regional Airport, MI22 mi70 minS 410.00 miFair79°F50°F38%1022 hPa

Link to 5 minute data for KBIV

Wind History from BIV (wind in knots)
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Last 24hr3W8W7NW4NW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE3CalmE44SE9S6SE6
1 day agoW8W6W9SW6W6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE5SE5E7E54E4
2 days agoNW11
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NW9NW5NW3NW3N3CalmSW3CalmCalmCalmCalmCalmCalmS4SW7W10W9
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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    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 (15,3,4,5)
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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.