Friday, September25, 2020
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Marine Weather and Tides
Spring Lake, 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 7:35AMSunset 7:37PM Friday September 25, 2020 8:09 PM EDT (00:09 UTC) Moonrise 3:52PMMoonset 12:00AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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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LMZ846 Holland To Grand Haven Mi- 405 Pm Edt Fri Sep 25 2020
Through early evening..South winds 10 to 15 knots. Sunny. Waves 1 to 2 feet.
Tonight..South winds 10 to 20 knots. Clear in the evening then becoming partly cloudy. Waves 2 to 3 feet.
Saturday..South winds 15 to 25 knots. Mostly Sunny. Waves 2 to 4 feet.
Saturday night..Southwest winds to 30 knots. Partly cloudy. Waves 4 to 6 feet building to 6 to 8 feet after midnight.
Sunday..Southwest winds 15 to 25 knots veering northwest 10 to 15 knots late in the day. Mostly cloudy with a slight chance of rain showers. Waves 5 to 7 feet subsiding to 2 to 3 feet late in the day.
Sunday night..Northwest winds 10 to 15 knots. Mostly cloudy with a chance of rain showers. Waves 1 to 3 feet.
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. Mostly cloudy with a chance of rain showers. Waves 3 to 5 feet.
Wednesday..West winds 20 to 25 knots. Mostly cloudy with a chance of rain showers. Waves 4 to 6 feet.
LMZ846 Expires:202009260800;;354913 FZUS53 KGRR 252006 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 405 PM EDT Fri Sep 25 2020 For waters within five nautical miles of shore on Lake Michigan LMZ846-260800-


7 Day Forecast for Marine Location Near Spring Lake, MI
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location: 43.07, -86.19     debug


Area Discussion for - Grand Rapids, MI
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FXUS63 KGRR 252340 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 740 PM EDT Fri Sep 25 2020

LATEST UPDATE . Aviation

SYNOPSIS. Issued at 323 PM EDT Fri Sep 25 2020

- One more warm dry day

- Sunday transitions to cooler with rain toward evening

- Monday looks cool and wet

- Lake effect showers and cool rest of week

DISCUSSION. (This evening through next Friday) Issued at 323 PM EDT Fri Sep 25 2020

-- One more warm dry day--

The convection to our northwest will lift east northeast of this area tonight as the warm front pushes north. There may be a little fog toward morning as more moist air, at low levels, moves in around sunrise. There is a lot of wind in the boundary layer so maybe we will get a brief stratus cloud deck instead of fog. No matter what, it will quickly mix out by mid morning.

The surge of colder air, resulting from the digging northern stream shortwave, caused the upper low over over Texas to shear out to our southest tonight. That helps to cause mid level ridging over our area, which in turn causes subsidence at mid level, which in turn dries the air. At the same time a lead shortwave, over Minnesota now, on the northern stream jet, is forced farther north. That is why the convection associated with it will stay well north of here tonight.

As that upstream system continues to move inland height rises are expected over the central CONUS and Great Lakes into Saturday. That will cause Saturday to be warmer than today but still considerable sunshine once the morning clouds mix out. Highs should reach the lower to mid 80s inland.

-- Sunday transitions to cooler with rain toward evening--

The surface front will come through dry early on Sunday as the next upstream shortwave tracking through the digging upstream trough will also lift northeast like tonights will. So, once again no rain expected. It is curious that the NAM12 has strong 1000 to 850 moisture transport into Southwest Michigan after midnight Saturday night. Normally that would mean showers but with the mid levels so dry we are still thinking no rain.

Finally the jet entrance region of that second lead wave, with southwest Michigan being into the cold air by Sunday afternoon as that part of the jet comes into our area, results in enough lift for rain finally develop over most of the area. Most of the rain will be Sunday night into Monday.

-- Monday looks cool and wet--

There is some suggestion that a surface wave will form on the front on Monday in the Tennessee Valley. If that happens we may see enhanced rainfall here in Southwest Michigan later Monday or Tuesday. Any thunderstorms would be in the warm air, well south and east of this area. This would just be rain. The ECMWF and GFS have different solutions with each run and given how hard a time the models have with shortwaves moving through digging troughs, it is to early to say how this will really play out. One thing for sure is Monday will be much cooler than the past week has been.

-- Lake effect showers and cool rest of week--

By Tuesday we get on the cyclonic side of the polar jet as a very impressive 160 to 180 knot jet core dives into the western side of that digging trough over the central CONUS. I would expect a period of showers as that secondary front comes through on Tuesday.

It is possible a second surface low will develop on the front as that stronger jet core reaches the cold front. The question is where does that surface low go? It may track north toward Michigan or it may go up the east coast. No matter what we stay in the cold air with lake enhanced rain showers through at least Friday, if not Saturday. The coldest weather will be Thursday and Friday.

AVIATION. (For the 00Z TAFS through 00Z Saturday evening) Issued at 740 PM EDT Fri Sep 25 2020

VFR conditions will continue through Saturday afternoon. Winds will be south tonight AOB 10 knots with some LLWS possible. Southwest winds on Saturday will gust over 20 knots.

MARINE. Issued at 323 PM EDT Fri Sep 25 2020

Expect 15 to 25 knot winds from the south tonight and southwest Saturday. This will build waves to 3 to 6 feet tomorrow and to 6 to 9 feet tomorrow night. So we will continue our Small Craft Advisory into Sunday afternoon. We added a Beach Hazard Statement since it will be warm enough to go to the beach Saturday.

At this point gales look less likely they are not totally out of the question. There is a developing surface low that tracks into Western Upper Michigan tomorrow night. That may deepen enough to cause gales over northern Lake Michigan. We will just have to see how this plays out.

With the front in the area the pressure gradient loosens so I do not expect winds to be all that strong Sunday afternoon into Monday but if that next wave on the front really develops we could yet have gales Tue/Wed. Something else we will have to watch for. It could be just the strength of the cold advection will drive gales Tuesday into Wednesday. Of course water spouts will have to be watched for too.

GRR WATCHES/WARNINGS/ADVISORIES. MI . Beach Hazards Statement from Saturday morning through Sunday afternoon for MIZ037-043-050-056.

LM . Small Craft Advisory until 2 PM EDT Sunday for LMZ847>849.



SYNOPSIS . WDM DISCUSSION . WDM AVIATION . Ostuno MARINE . WDM


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
45161 12 mi50 min 3.9 G 3.9 66°F 65°F1 ft1012.7 hPa
45029 13 mi30 min SSE 1.9 G 3.9 67°F 66°F1 ft1012.4 hPa60°F
MKGM4 - Muskegon, MI 13 mi40 min S 8 G 8 68°F 1012.1 hPa58°F
HLNM4 - 9087031 - Holland, MI 21 mi52 min SSE 1.9 G 1.9 69°F 66°F1012.3 hPa58°F
45168 47 mi30 min NE 1.9 G 3.9 67°F 69°F1 ft1012.7 hPa59°F
SVNM4 - South Haven, MI 47 mi40 min NE 1.9 G 1.9 71°F
LDTM4 - 9087023 - Ludington, MI 62 mi58 min S 6 G 12 71°F 53°F

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muskegon, Muskegon County Airport, MI9 mi15 minSSE 510.00 miFair67°F54°F63%1012.4 hPa
Holland - West Michigan Regional Airport, MI23 mi17 minN 010.00 miFair66°F55°F70%1012.9 hPa

Link to 5 minute data for KMKG

Wind History from MKG (wind in knots)
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Last 24hrS4SE5SE4SE7SE5SE5CalmS7S4CalmE3SE3CalmSE3S5S7SW6S9S10SW10S11
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1 day agoS4S3S4S3S4S4S4CalmCalmCalmCalmS3SW4S3S6S8S10SW13S11S11S10S10S8S5
2 days agoS4S4S4CalmCalmS3SW3S3CalmCalmCalmCalmCalmCalmSW54SW6SW9SW9SW8SW11SW10SW9S6

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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