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Marine Weather and Tides
Version 3.4 |
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported. 5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive. 5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds. |
| Sunrise 7:35AM | Sunset 7:34PM | Tuesday September 26, 2017 2:19 PM EDT (18:19 UTC) | Moonrise 12:46PM | Moonset 10:39PM | Illumination 36% |  |
Marine Forecasts
EDIT (on/off) Help| LMZ845 South Haven To Holland Mi- 955 Am Edt Tue Sep 26 2017 Rest of today..Southwest winds 10 to 15 knots. Mostly Sunny. Waves 1 foot or less. Tonight..Southwest winds around 10 knots veering northwest 10 to 20 knots after midnight. Partly cloudy with a slight chance of showers and isolated Thunderstorms in the evening, then mostly cloudy with a slight chance of showers overnight. Waves 1 to 3 feet building to 3 to 5 feet toward daybreak. Wednesday..Northwest winds 20 to 25 knots. Mostly cloudy until midday then becoming mostly Sunny. Waves 4 to 6 feet. Wednesday night..North winds 10 to 20 knots decreasing to 5 to 10 knots toward daybreak. Partly cloudy. Waves 3 to 5 feet subsiding to 1 to 3 feet toward daybreak. | LMZ845 Expires:201709262115;;960109 FZUS53 KGRR 261355 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 955 AM EDT Tue Sep 26 2017 For waters within five nautical miles of shore on Lake Michigan LMZ845-262115- |
7 Day Forecast for Marine Location Near Fennville, MI
Hourly EDIT Helplocation: 42.65, -86.09 debug
Area Discussion for - Grand Rapids, MI
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus63 kgrr 261753 afdgrr area forecast discussion national weather service grand rapids mi 153 pm edt Tue sep 26 2017 latest update... aviation hydro Synopsis Issued at 325 am edt Tue sep 26 2017 one more day of record to near record highs in the upper 80s to lower 90s. A cold front comes through the area early tonight with only scattered showers and perhaps an isolated thunderstorm. This will lower our high temperatures on Wednesday nearly 25 degrees from todays values. This will only brings afternoon temperatures to near normal values. A second cold front on Friday brings in the truly cold air and lake enhanced rain showers near lake michigan. Temperatures will by then be chilly. Another warming trend follows by early next week. Short term (today through Thursday) issued at 325 am edt Tue sep 26 2017 the primary question for today is can we get any rain from the frontal system tonight? It has been 17 days since grand rapids has had measurable rainfall so we can use the rain. However the way the front comes through it is really questionable if much in the way of significant rainfall will occur with this front tonight. As I have been saying the past few days the upper trough that pushes the cold front through is actually being sheared out by an upstream pacific system. The problem is the longwave upper ridge is still actually in place. So most of the dynamic energy goes well north into southern canada with this frontal system. The focus of the 1000 850 moisture transport is over upper michigan into ontario north of lake huron. The axis of the low level jet is actually north of us as the front comes through and has nearly always been the case this year we are in the speed divergence area of the low level jet (not a good place for significant convection). Also model sounding show CAPE is limited at best. There are three things through that none the less favor some showers, we do get into the right entrance region of the jet overnight, precipitable water is near 1.75 inches, much above normal, and there is upper divergence over surface convergence. So I have increased the pop tonight by about 10 percent do not expect a widespread rain event with this front. Behind the front Wednesday into Thursday we have shallow cold air so expect much cooler temperatures and partly cloudy skies. Long term (Thursday night through Monday) issued at 325 am edt Tue sep 26 2017 |
another surge of chilly air will be pushing in with an upper short wave by Friday. This feature will also bring a decent chance of showers mostly late Thursday night into Friday morning. Some rain is better than nothing, but it appears a quarter inch of less will come with this system. The chilly air, and slightly below normal temps, that moves in on Friday will linger through the weekend with daytime highs holding in the 60s, and nighttime lows inland in the upper 30s to lower 40s. Some patchy frost will be possible both Friday and Saturday nights. Warm advection commences Sunday night and into Monday as we see surface and upper ridging sliding in. Highs should be back to a bit above normal into the 70s for Monday. It should remain dry Friday night through Monday with the ridging taking back over. Aviation (for the 18z tafs through 18z Wednesday afternoon) issued at 153 pm edt Tue sep 26 2017 winds will shift west-northwest with a cold front tonight between 02z at mkg and 07z at jxn. Gusts 15 to 20kt are possible behind this front. Scattered showers and an isolated thunderstorm may also develop in proximity to this front. The greatest chance of rain and thunder will exist at locations farther west e.G. Mkg. Expecting low stratus clouds to develop behind the cold front overnight, continuing through morning. Ceilings will be MVFR but could dip into ifr. Marine Issued at 325 am edt Tue sep 26 2017 small craft advisories will likely be needed Wednesday as north winds of 15 to 25 knots build waves to as high as 6 feet. Hydrology Issued at 153 pm edt Tue sep 26 2017 low river flows will continue across west michigan through at least the upcoming weekend. Rain will be a possibility tonight and again Thursday night into Friday. Precipitation amounts will be generally one quarter inch or less tonight... With one tenth to one quarter of an inch expected for the Thursday night Friday event. These will not cause impactful rises in area rivers. Grr watches warnings advisories Mi... None. Lm... None. Synopsis... Wdm short term... Wdm long term... Jk aviation... Cas hydrology... Mws marine... Wdm |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| HLNM4 - 9087031 - Holland, MI | 11 mi | 49 min | S 9.9 G 11 | 74°F | 1014.4 hPa | |||
| SVNM4 - South Haven, MI | 20 mi | 39 min | S 8 G 8.9 | 75°F | ||||
| 45029 | 20 mi | 29 min | SSW 7.8 G 9.7 | 72°F | 70°F | 1 ft | 1014.1 hPa | 65°F |
| 45168 | 22 mi | 29 min | SSW 7.8 G 9.7 | 74°F | 72°F | 1 ft | 1014.5 hPa | 64°F |
| 45161 | 39 mi | 39 min | SSE 9.7 G 12 | 72°F | 70°F | 1014.3 hPa | ||
| MKGM4 - Muskegon, MI | 42 mi | 29 min | S 14 G 16 | 76°F | 1013.6 hPa | 68°F | ||
| SJOM4 - St. Joseph, MI | 44 mi | 79 min | SSW 8.9 G 11 | 79°F | 1015.6 hPa (+0.4) |
Wind History for Holland, MI
(wind in knots) EDIT (on/off) Help| 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | |
| Last 24hr | S | S | S | S | -- | S | E | E | E | E | E | E | E | E | E | E | E | E | E | E | S | S | S | S |
| 1 day ago | W | NW | NW | N | N | N | E | E | E G7 | SE G12 | E | E G17 | SE G18 | SE G15 | SE G14 | E | SE | SE | SE | S | S | S | S | |
| 2 days ago | W | NW | -- | NW | N | NW | -- | E | E | E | E | E | E G11 | E | E G8 | SE G18 | E G7 | N | E G9 | E | S | SW | S | S |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Holland - West Michigan Regional Airport, MI | 7 mi | 26 min | SW 11 | 10.00 mi | A Few Clouds | 89°F | 62°F | 41% | 1014.2 hPa |
| South Haven, South Haven Area Regional Airport, MI | 22 mi | 23 min | W 7 | 10.00 mi | Fair | 86°F | 59°F | 40% | 1014.9 hPa |
Wind History from BIV (wind in knots)
| 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | |
| Last 24hr | SE | SW | S | S | S | Calm | Calm | Calm | E | Calm | SE | Calm | Calm | Calm | Calm | Calm | SE | S | S | S | SW | SW | SW | SW |
| 1 day ago | SW | W | NW | NW | Calm | Calm | SE | Calm | Calm | Calm | SE | SE | S | S | SE | S | Calm | Calm | S | S | Calm | |||
| 2 days ago | NW | NW | NW | NW | W | Calm | Calm | Calm | Calm | SE | E | E | Calm | Calm | Calm | Calm | SE | SE | S | S | S | S | SW |
Tide / Current Tables for
EDIT RT Ports Option Weekend mode (on/off) (on/off) HelpTide / Current Tables for
EDIT (on/off) HelpWeather Map and Satellite Images
(on/off) HelpWeather Map | IR Satellite Image from GEOS GOES Local Image of GreatLakes EDIT  |
Wind Forecast for Grand Rapids, MI (14,3,4,5)
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Ground Weather Radar Station Grand Rapids/Muskegon, MI
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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. |