Marine Forecasts

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7 Day Forecast for Marine Location Near Fennville, MI

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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

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
HLNM4 - 9087031 - Holland, MI	11 mi	47 min	W 8 G 9.9	71°F	67°F		1021.1 hPa	61°F
45029	20 mi	15 min	WNW 3.9 G 5.8	67°F	62°F		1021.2 hPa	60°F
SVNM4 - South Haven, MI	20 mi	35 min	W 8.9 G 8.9	72°F
45168	22 mi	15 min	W 5.8 G 7.8	74°F	75°F	1 ft	1021.2 hPa	59°F
45161	40 mi	25 min	W 3.9 G 3.9	68°F	62°F		1021.4 hPa
MKGM4 - Muskegon, MI	42 mi	25 min	WNW 6 G 6	71°F			1021.3 hPa	62°F
SJOM4 - St. Joseph, MI	44 mi	65 min	NNW 4.1 G 5.1	75°F			1022.7 hPa (-0.3)

Wind History for Holland, MI

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Holland - West Michigan Regional Airport, MI	7 mi	72 min	SSE 6	10.00 mi	Fair	81°F	48°F	33%	1021.9 hPa
South Haven, South Haven Area Regional Airport, MI	22 mi	70 min	S 4	10.00 mi	Fair	79°F	50°F	38%	1022 hPa

Link to 5 minute data for KBIV

Wind History from BIV (wind in knots)

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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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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.
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Other links: Northern Pacific     Contential US     Full GOES-East

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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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