Thursday, September23, 2021
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Marine Weather and Tides
Fennville, MI

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:32AMSunset 7:41PM Thursday September 23, 2021 2:55 PM EDT (18:55 UTC) Moonrise 8:09PMMoonset 9:06AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 216 Pm Edt Thu Sep 23 2021
.small craft advisory in effect through Friday morning...
Rest of today..Northwest winds to 30 knots. Rain showers likely. A slight chance of waterspouts. Waves 7 to 10 feet.
Tonight..Northwest winds 15 to 25 knots backing west 10 to 20 knots after midnight. Partly cloudy with a chance of rain showers. Waves 7 to 10 feet subsiding to 4 to 6 feet toward daybreak.
Friday..West winds 15 to 25 knots. Sunny. Waves 4 to 6 feet.
Friday night..South winds to 30 knots veering west 15 to 25 knots late at night, then veering northwest 10 to 20 knots toward daybreak. Rain showers likely and a slight chance of Thunderstorms. Waves 6 to 8 feet.
Saturday..West winds 15 to 20 knots. Mostly Sunny with a slight chance of rain showers. Waves 3 to 5 feet.
Sunday..West winds 15 to 20 knots backing southwest late in the day. Sunny. Waves 2 to 4 feet.
Monday..Southwest winds around 15 knots becoming 10 to 15 knots late in the day. Mostly Sunny. Waves around 1 foot.
LMZ845 Expires:202109232115;;066471 FZUS53 KGRR 231816 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 216 PM EDT Thu Sep 23 2021 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 231845 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 245 PM EDT Thu Sep 23 2021

LATEST UPDATE . Synopsis/Discussion/Marine

SYNOPSIS. Issued at 217 PM EDT Thu Sep 23 2021

- Diminishing rain and wind this evening

- Thunderstorms possible Friday evening with heavy rain and gusty winds

- Drying out for next week


DISCUSSION. (This evening through next Thursday) Issued at 217 PM EDT Thu Sep 23 2021

- Diminishing rain and wind this evening

The low pressure system centered near Detroit will lift slowly north northeast into tonight. The pressure gradient will gradually weaken across the CWA during that time. Also the mixing height will be lowering during the evening. As a result the wind will become less gusty and the sustained values will be lowering through the night. We will likely hold onto some light rain/drizzle into the evening . but as the low pulls away the moisture depth and lift will diminish leading to conditions drying out. Models are in relative agreement in showing no precipitation in the CWA after 09z.

- Thunderstorms possible Friday evening with heavy rain and gusty winds

Models are in decent agreement in showing no precipitation for Friday . through 00z Sat. Then the cold front pushes in for the evening and overnight period. The main signal in the models is for a band of more than a half inch of rain with some area potentially seeing more than an inch. The southwest flow seems to be favoring the Muskegon to Fremont to Big Rapids region for the heaviest rain. Soil conditions are relatively dry in those locations so this should result in no impacts other than some ponding of water near any clogged drains. Some instability will be present along the frontal zone and higher surface theta e values coming off of Lake MI could support better instability closer to the lakeshore. The HRRR and Namnest have been showing a risk for gusty winds around the frontal zone. This seems reasonable given the strengthening temperature gradient and winds at 850 mb as the front enters MI.

- Drying out for next week

The Gulf moisture stays to the south and west of the CWA next week as a sharp mid level ridge develops just west of the MI. This ridge is shown to stall out and continue to influence our weather possibly into next weekend. Being on the east side of this system . we will see subsidence and dry air advection. All this should spell below normal precipitation. As for the temperatures . some uncertainty exists there. Several models like the 12z GFS and 00z High Res Euro are showing 925 mb temps cooling off during the week. Thus a potential for gradual cooling trend may exist. The incoming 12z Euro suggest the cooling trend will not last long if it happens. We will start the week off with above normal values.


AVIATION. (For the 18Z TAFS through 18Z Friday afternoon) Issued at 1200 PM EDT Thu Sep 23 2021

A mix of mainly MVFR/IFR conditions will continue this afternoon due to lingering low clouds and showers. In addition windy conditions will continue this afternoon with north winds gusting to 30 kts at times.

Conditions will gradually improve to predominantly MVFR and then VFR tonight as the rain departs. In addition winds will diminish to around 10 kts this evening and become westerly. VFR conditions will then continue through 18Z Friday.

MARINE. Issued at 217 PM EDT Thu Sep 23 2021

The pressure gradient remains relatively tight into the late afternoon hours but gradually weakens tonight. The waves will take longer to settle down. We did issue a SCA to replace the GLW earlier. A break in the hazardous conditions is expected for part of Friday By evening though. the south to southwest flow will be strengthening and gusts over 25 knots are looking likely around the next front. There could even be a short window for gales. There a window this afternoon and evening when a risk for waterspouts will exist. We will maintain the BHS into this evening given the ongoing hazardous conditions along the lakeshore.


GRR WATCHES/WARNINGS/ADVISORIES. MI . Beach Hazards Statement until 11 PM EDT this evening for MIZ037- 043-050-056-064-071.

LM . Small Craft Advisory until 10 AM EDT Friday for LMZ844>849.



SYNOPSIS . MJS DISCUSSION . MJS AVIATION . Laurens MARINE . MJS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HLNM4 - 9087031 - Holland, MI 11 mi56 min WNW 12 G 14 50°F 52°F1010.5 hPa (+0.0)46°F
45029 20 mi26 min NW 9.7 G 14 48°F 43°F4 ft1011.3 hPa42°F
SVNM4 - South Haven, MI 20 mi26 min 13 G 14 51°F
45168 22 mi26 min NNW 7.8 G 12 49°F 46°F5 ft1012.2 hPa42°F
45161 40 mi36 min N 12 G 16 50°F 1011.2 hPa
MKGM4 - Muskegon, MI 42 mi26 min NNE 11 G 14 53°F 1011.1 hPa46°F
SJOM4 - St. Joseph, MI 44 mi56 min N 11 G 17 54°F 1013.5 hPa (+0.6)

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Holland - West Michigan Regional Airport, MI7 mi63 minNNW 9 G 1810.00 miOvercast56°F45°F67%1010.9 hPa
South Haven, South Haven Area Regional Airport, MI22 mi61 minNW 7 G 1610.00 miOvercast53°F44°F71%1011.5 hPa

Link to 5 minute data for KBIV

Wind History from BIV (wind in knots)
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Last 24hrN9
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1 day agoN5N7N5N94N7N7N6N43N5NE34N4CalmN6N45N8
G17
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2 days agoS9S15
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S10S11SW9SW14
G21
W11N7NW6N53NW7

Tide / Current Tables for
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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