Thursday, April22, 2021
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Marine Weather and Tides
Douglas, MI

Version 3.4
NOTICE
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 6:49AMSunset 8:36PM Thursday April 22, 2021 9:16 AM EDT (13:16 UTC) Moonrise 2:13PMMoonset 3:53AM Illumination 80% Phase: Waxing Gibbous; Moon at 10 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- 805 Am Edt Thu Apr 22 2021
Today..West winds 10 to 20 knots backing southwest late in the day. Sunny. A slight chance of snow showers until midday. Waves 2 to 3 feet.
Tonight..South winds 10 to 20 knots veering southwest after midnight. Mostly clear. Waves 1 to 2 feet building to 2 to 4 feet after midnight.
Friday..Southwest winds 10 to 20 knots. Partly Sunny. Waves 2 to 4 feet subsiding to 1 to 3 feet late in the day.
Friday night..South winds around 10 knots. Mostly cloudy with a chance of rain showers. Waves around 1 foot.
Saturday..East winds around 10 knots backing north. Mostly cloudy with a chance of rain showers. Waves 1 foot or less.
Sunday..North winds 10 to 20 knots. Mostly Sunny. Waves 3 to 5 feet.
Monday..Southeast winds around 20 knots. Partly Sunny. Waves 1 to 2 feet.
LMZ845 Expires:202104222000;;943266 FZUS53 KGRR 221205 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 805 AM EDT Thu Apr 22 2021 For waters within five nautical miles of shore on Lake Michigan LMZ845-222000-


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 221143 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 743 AM EDT Thu Apr 22 2021

LATEST UPDATE . Aviation

SYNOPSIS. Issued at 330 AM EDT Thu Apr 22 2021

- Isolated rain or snow showers today

- Chances for rain showers Friday night through Saturday night

- Warming trend next week

- Additional chances for precipitation mid next week

DISCUSSION. (Today through next Wednesday) Issued at 330 AM EDT Thu Apr 22 2021

- Isolated rain or snow showers today

Isolated snow showers are possible this morning with lake induced instability almost to thresholds needed for outright lake generated precipitation. Delta T's this morning are on the order of 12C. Precipitation moving in off the lake early this morning is remnants of diurnally driven upstream precipitation from yesterday evening that has drifted out of the lake. Either way, small pops are probably warranted for an isolated snow showers. This afternoon, enough instability will develop over land for heat of the day rain showers, especially off to the east and south of Grand Rapids.

- Chances for rain showers Friday night through Saturday night

Models have remained consistent on the potential for rain showers beginning as early as Friday night. The precipitation will be centered during the day on Saturday however. An upper trough will be moving through the area, with the main surface low well south of the State of Michigan. Right now we have chance pops in place for most of the forecast area, 20-50 percent, but could see this needing to be bumped up with time. Best chances will be across Southern Lower Michigan. Precipitation does not look heavy.

- Warming trend next week

Today will be the coldest day of the 7 day forecast. 850mb temperatures at midday will still be around -8C. We warm tonight to around Zero C and remain there much of the next few days, Friday through Sunday. 50s for highs will be fairly common Friday through Sunday.

The warming trend begins ahead of our next weather system that is forecast to move through mid next week. The southerly flow ahead of this system will boost 850mb temps all the way into the middle teens C. Highs will correspondingly jump into the 70s for Tuesday and likely Wednesday which will be above normal.

- Additional chances for precipitation mid next week

Models continue to bring a surface low up into the Great Lakes mid next week. This system will be wetter than the weekend system with PWAT values jumping to around an inch and a quarter. Rainfall from this system will likely reach around a half inch in many places. Model ensemble data shows the chance for some heavier precipitation though so we will continue to watch out this system evolves. In deep southerly flow, the gulf will be wide open.

AVIATION. (For the 12Z TAFS through 12Z Friday morning) Issued at 745 AM EDT Thu Apr 22 2021

No significant aviation issues are expected the next 24 hours. VFR weather is expected to continue through the period. We will have some ceilings today, but they should be between 4,000 and 8,000 feet. Skies should trend towards mostly clear this afternoon and evening from west to east. Winds will be westerly at 10-20 knots this afternoon. Strengthening winds aloft tonight may create some low level wind shear issues as winds at 2,000ft increase to around 35-40 knots from the southwest.

MARINE. Issued at 330 AM EDT Thu Apr 22 2021

Overall, still no major concerns in the marine forecast over the course of the next couple of days. The one main focus point remains tonight. Models still continue to show 30-40 knots of wind up around 1,000ft tonight in a southwest flow. The question is whether or not this fairly short time frame wind (12 hrs) mixes down the the surface in what will be a warm air advection regime. Models still think much of the wind will remain aloft and therefore wave fields continue to be forecast to only reach the 2-4ft range. Otherwise, the next concern will be Saturday night in northwest flow behind a departing low. Winds and waves may reach Small Craft Advisory criteria Saturday night.

GRR WATCHES/WARNINGS/ADVISORIES. MI . Freeze Warning until 11 AM EDT this morning for MIZ037-038-043- 044-050>052-056>059-064>067-071>074.

LM . None.

SYNOPSIS . Duke DISCUSSION . Duke AVIATION . Duke MARINE . Duke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HLNM4 - 9087031 - Holland, MI 9 mi47 min WNW 16 G 18 38°F 46°F1018 hPa32°F
SVNM4 - South Haven, MI 17 mi37 min 18 G 19 38°F
45029 18 mi27 min NW 14 G 18 38°F 41°F2 ft1019.6 hPa27°F
45168 18 mi27 min W 14 G 18 39°F 44°F2 ft1020.3 hPa28°F
SJOM4 - St. Joseph, MI 40 mi77 min W 12 G 14 40°F 1019.6 hPa (+0.6)
MKGM4 - Muskegon, MI 41 mi27 min NW 13 G 14 38°F 1019.8 hPa28°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 mi24 minWNW 8 G 1710.00 miMostly Cloudy38°F28°F68%1019.5 hPa
South Haven, South Haven Area Regional Airport, MI20 mi22 minW 710.00 miOvercast39°F30°F72%1019 hPa

Link to 5 minute data for KBIV

Wind History from BIV (wind in knots)
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Last 24hrCalmN4NW4W8NW5--NW8NW10NW12
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NW9NW9NW7NW3W3SW4W3CalmSW3W3W4SW3W6W7W8
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1 day ago5NW8NW8NW8W11
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NW9NW8NW8N6N6N6N5N4N4N4NE4NE3N4CalmCalmE5
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N5N3N5N4CalmN3N3NW4N6

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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