Sunday, March24, 2019 L-36.com


Marine Weather and Tides
Pentwater, MI

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:39AMSunset 8:03PM Sunday March 24, 2019 5:16 AM EDT (09:16 UTC) Moonrise 11:32PMMoonset 9:03AM Illumination 88% Phase: Waning Gibbous; Moon at 18 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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LMZ848 Whitehall To Pentwater Mi- 412 Pm Est Fri Jan 25 2019
.heavy freezing spray warning in effect through Saturday morning...
.small craft advisory in effect through Saturday afternoon...
Tonight..Northwest winds 10 to 20 knots. Mostly cloudy with a slight chance of snow showers. Heavy freezing spray. Waves 2 to 5 feet.
Saturday..Southwest winds 10 to 20 knots. Mostly cloudy. Heavy freezing spray. Waves 2 to 3 feet.
Saturday night..Northwest winds 15 to 25 knots. Snow showers likely in the evening, then a chance of snow showers overnight. Heavy freezing spray through the night. Waves 3 to 5 feet.
Sunday..Northwest winds 10 to 20 knots. Mostly cloudy with a slight chance of snow showers. Heavy freezing spray. Waves 3 to 5 feet. This is the last nearshore marine forecast (nshgrr) issuance for the season. The nshgrr will again be issued around april 1st 2019, or as conditions warrant.
LMZ848 Expires:201901260415;;919600 FZUS53 KGRR 252113 CCA NSHGRR Nearshore Marine Forecast...corrected National Weather Service Grand Rapids MI 412 PM EST Fri Jan 25 2019 For waters within five nautical miles of shore on Lake Michigan LMZ848-260415-


7 Day Forecast for Marine Location Near Pentwater, MI
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location: 43.78, -86.43     debug


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 240721
afdgrr
area forecast discussion
national weather service grand rapids mi
321 am edt Sun mar 24 2019
latest update...

synopsis discussion

Synopsis
Issued at 143 am edt Sun mar 24 2019
- mild today with a few showers possible later today into tonight
- cooler to start the work week
- mild for mid week then showery and cooler

Discussion (today through next Saturday)
issued at 143 am edt Sun mar 24 2019
the storm system that was to bring some showers to the region
today into tonight is looking weaker with time. Part of this
trend is due to the stronger mid level confluent flow across mi.

Subsidence associated with this feature will act to limit the
humidity levels in the lower parts of the atmosphere. Also the
amplitude of the wave decreases with time as it bumps into the
confluent flow which ends up taking a track further south of the
area. So as the precipitation tries to move in... Much of it will
dry up. There is still a potential for showers but the risk is
lower and shifted to mainly central and southern parts of the
region.

A cooler airmass continues to filter in from the north into
Monday. The 925 mb thermal trough tracks through mi on Monday.

Thus this should be the coolest day. Well below normal
temperatures will occur... Especially Tuesday morning with
temperatures in the teens to low 20s to start the day. Not much
improvement to the high temperatures is forecasted for
Tuesday... Still below normal.

Typical of spring time the pattern shifts Wednesday into Thursday.

A southwesterly low level jet moves in during this time and that
will advect a milder airmass into the area. Above normal
temperatures are forecasted and we may make a run at 60 degrees
for Thursday. Stay tuned on this one as the latest high res euro
is showing a cold front dropping down from the northwest thu. Any
acceleration of this could impact high temperatures on Thursday
considerably.

A storm system that comes ashore in ca Wednesday crosses the
rockies and enters the plains for the end of the week. A northern
stream wave tries to catch up to this system as it enters the
great lakes region Friday into Saturday. This would support a
strengthening storm system tracking through near mi which will
need to be monitored closely. There is some potential for an
overrunning pattern with shallow cold air undercutting the gulf
moisture advecting into this potential storm system which may
support heavier precipitation.

Aviation (for the 06z tafs through 06z Sunday night)
issued at 1250 am edt Sun mar 24 2019
little change to the going forecast. Light rain still expected at
the southern TAF sites later this afternoon where MVFR CIGS will
also develop. Otherwise,VFR expected at the northern TAF sites.

Hydrology
Issued at 330 pm edt Sat mar 23 2019
rivers primarily in the grand and muskegon river basins will
continue to fall in the coming days with no significant
precipitation expected over the next four to five days. River level
falls across the far north may be slower than normal as gradual
snowmelt continues; however, no flooding is expected in the coming
days. Chances for precipitation, possibly widespread, will
increase toward the end of next week.

Grr watches warnings advisories
None.

Synopsis... Mjs
discussion... Mjs
aviation... 04
hydrology... Borchardt


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDTM4 - 9087023 - Ludington, MI 12 mi34 min 36°F 30°F
MKGM4 - Muskegon, MI 39 mi16 min SSW 9.9 G 11 33°F 1022.6 hPa (-1.4)30°F

Wind History for Ludington, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ludington, Mason County Airport, MI12 mi22 minSW 9 G 1410.00 miFair37°F30°F79%1020.3 hPa

Wind History from LDM (wind in knots)
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Last 24hrCalmCalmCalmCalmS3SW4W6SW8W8SW10
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1 day agoN8
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N3CalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmN3CalmN4N6N6N3NW6NW6NW8W8W6SW8SW8SW9SW8SW6W4NW7N5N8N7N9

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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wmap_A
GOES 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
Wind Forecast for Grand Rapids, MI (5,6,7,8)
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Ground Weather Radar Station Grand Rapids/Muskegon, MI
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weather_mapweather_map weather_map

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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.