Friday, September25, 2020
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Marine Weather and Tides
Douglas, MI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:34AMSunset 7:37PM Friday September 25, 2020 8:09 AM EDT (12:09 UTC) Moonrise 3:51PMMoonset 12:00AM Illumination 58% Phase: First Quarter Moon; Moon at 8 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- 406 Am Edt Fri Sep 25 2020
Early this morning..South winds around 10 knots. Clear. Waves 1 foot or less.
Today..South winds 10 to 15 knots. Sunny. Waves 1 foot or less.
Tonight..South winds 5 to 15 knots increasing to 15 to 20 knots after midnight. Partly cloudy. Waves 1 to 2 feet.
Saturday..South winds 15 to 20 knots. Mostly Sunny. Waves 2 to 4 feet.
Saturday night..South winds 15 to 25 knots veering southwest to 30 knots after midnight. Partly cloudy. Waves 4 to 6 feet.
Sunday..Southwest winds 15 to 20 knots veering northwest 10 to 15 knots late in the day. Mostly cloudy with a chance of rain showers. Waves 3 to 5 feet subsiding to 2 to 3 feet late in the day.
Monday..Northwest winds 10 to 15 knots. Mostly cloudy with a chance of rain showers. Waves 1 to 2 feet.
Tuesday..West winds 15 to 20 knots. Rain showers likely. Waves 3 to 5 feet.
LMZ845 Expires:202009252000;;329982 FZUS53 KGRR 250806 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 406 AM EDT Fri Sep 25 2020 For waters within five nautical miles of shore on Lake Michigan LMZ845-252000-


7 Day Forecast for Marine Location Near Douglas, MI
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location: 42.64, -86.21     debug


Area Discussion for - Grand Rapids, MI
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FXUS63 KGRR 251135 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 735 AM EDT Fri Sep 25 2020

LATEST UPDATE . Aviation

SYNOPSIS. Issued at 318 AM EDT Fri Sep 25 2020

- Remaining mostly dry and mild through Sunday

- Best chance for rain Monday Night/Tuesday

- Much cooler with occasional chances for rain beyond Tuesday

DISCUSSION. (Today through next Thursday) Issued at 318 AM EDT Fri Sep 25 2020

-- Remaining mostly dry and mild through Sunday --

The trend for the cold front moving in, and the associated chances of rain have continued to be delayed until late this coming weekend, and more toward early next week.

The delay is due to development of the long wave upper low taking a little longer to become established. A couple of the lead short waves stay north and west of the area, taking the best forcing north and west of the area also. That leaves the area under a dry and warm air mass for people to enjoy much of the weekend. We do have some small rain chances up north on Saturday. We do not expect much, if anything to occur as the bulk of the rain will be across the Tip of the Mitt and the U P.

The front will push over the area on Sunday, however the lingering dry air mass, and the upper forcing with the developing upper low staying west, will keep the first half of Sunday dry. Slowly, but surely, the upper jet, and its associated forcing will inch closer toward the area later Sunday, increasing the chance for rain. With this occuring during the warmest part of the day, we do have sufficient instability to justify a chance of thunder.

-- Best chance for rain Monday Night/Tuesday --

The front will be holding over the area Sunday night into Monday, keeping a chance of rain showers over the area. The front holds up as the upper low takes shape, and waves of low pressure start to ride NE along the front.

The best chance of rain now looks to come in Monday night and early Tuesday. This is when the area is under the best upper divergence ahead of the upper low, and best moisture transport takes place ahead of the associated surface low riding NE along the front. The trough axis is expected to move east of the area Tuesday afternoon, which should diminish the rain shower activity temporarily.

-- Much cooler with occasional chances for rain beyond Tuesday --

It looks like we will likely have a break in rain later Tuesday and into much of Wednesday. The upper jet does not really dive south of the area through this time frame. We will likely be in between lows, which will bring cooler, and some drier air in.

The coldest air with this pattern looks to potentially come in for Thursday and beyond. The lower heights will remain in place for most of the eastern portion of the country. Another strong jet max/short wave will dive down, and could take the upper jet core south of the area. This would bring the core of the colder air overhead, which would cause some possible lake effect rain showers near the lake, and instability showers over the land areas. Highs late in the week may struggle to rise out of the 50s.

AVIATION. (For the 12Z TAFS through 12Z Saturday morning) Issued at 735 AM EDT Fri Sep 25 2020

Other than some brief patchy fog at KAZO and KJXN, the widespread fog stayed north of the sites as expected. Fog is possible for another hour so so, but the worst is likely behind us. We just expected few-sct cumulus development this afternoon, along with southerly winds picking up, and gusting to around 20 knots or so. These winds will then diminish toward sunset. The wind will then pick up again at KMKG as a core of wind comes in. A steady wind expected tonight should keep fog from forming.

MARINE. Issued at 318 AM EDT Fri Sep 25 2020

We will be issuing a Small Craft Advisory for the area from Grand Haven and north. We will hold off on a Beach Hazards Statement for the time being, expecting the main impacts to any swimmers would be on Saturday.

Winds will be on the increase this afternoon for the northern marine zones, where the better gradient will be. The core of the wind, and waves will be starting tonight, but they will be close enough today to warrant hoisting the Small Craft Advisory for now. Waves will not quite reach thresholds for issuing a Beach Hazards Statement for today, but looks like a better chance for the beach day on Saturday that may eventually necessitate a Statement. Gales still look possible on Saturday night.

One thing to mention for the mid-week time frame is the potential for waterspouts. The colder air and low pressure aloft coming in over the relatively warmer lakes is a good setup for waterspouts.

GRR WATCHES/WARNINGS/ADVISORIES. MI . None. LM . Small Craft Advisory from noon today to 8 AM EDT Saturday for LMZ847>849.



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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HLNM4 - 9087031 - Holland, MI 9 mi57 min SSE 8 G 9.9 65°F 65°F1014.8 hPa58°F
SVNM4 - South Haven, MI 17 mi39 min SE 7 G 7 59°F
45029 18 mi29 min S 9.7 G 12 65°F 65°F1 ft1015.2 hPa59°F
45168 18 mi29 min ESE 5.8 G 7.8 62°F 66°F1 ft1015.9 hPa55°F
45161 38 mi49 min 5.8 G 7.8 65°F 65°F1 ft1015.2 hPa
SJOM4 - St. Joseph, MI 40 mi69 min SSE 1.9 G 4.1 59°F 1015.9 hPa (+0.3)
MKGM4 - Muskegon, MI 41 mi29 min S 9.9 G 11 64°F 1015.2 hPa62°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 43 mi39 min SW 7.8 G 9.7 67°F 65°F1015.1 hPa64°F

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Holland - West Michigan Regional Airport, MI10 mi76 minN 010.00 miFair56°F51°F84%1015.5 hPa
South Haven, South Haven Area Regional Airport, MI20 mi74 minN 010.00 miFair52°F50°F96%1015.6 hPa

Link to 5 minute data for KBIV

Wind History from BIV (wind in knots)
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Last 24hrCalmS4SW6SW8SW8W7W8SW10SW8SW7S5CalmSE3CalmSE4S5S5S5S5S4CalmCalmCalmS4
1 day agoS3W5SW6W5SW8W7W8W8W10W7SW6CalmCalmCalmCalmCalmCalmCalmS3SE3SE3CalmSE4S3
2 days agoS3SW3S6SW6SW6W8W9W8W8SW6S3CalmS3CalmCalmS3SE3S3S3S3CalmCalmCalmCalm

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Grand Rapids/Muskegon, MI
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