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Marine Weather and Tides
Version 3.4 |
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
| Sunrise 6:51AM | Sunset 8:45PM | Saturday August 17, 2019 1:14 PM EDT (17:14 UTC) | Moonrise 9:08PM | Moonset 7:42AM | Illumination 96% |  |
LMZ845 South Haven To Holland Mi- 1105 Am Edt Sat Aug 17 2019
Rest of today..West winds 5 to 10 knots. Partly Sunny with a chance of showers and Thunderstorms. Waves 1 foot or less.
Tonight..South winds 5 to 15 knots. Partly cloudy with a chance of showers and Thunderstorms. Waves 1 foot or less.
Sunday..Southwest winds 15 to 20 knots. Rain showers likely and a slight chance of Thunderstorms. Waves 1 to 2 feet building to 2 to 4 feet.
Sunday night..Southwest winds 10 to 15 knots veering west 5 to 10 knots toward daybreak. Partly cloudy with a chance of rain showers. Waves 1 to 3 feet.
Monday..Northwest winds 5 to 10 knots. Mostly Sunny. Waves 1 to 2 feet.
Tuesday..Southeast winds around 5 knots veering southwest. Mostly Sunny with a chance of rain showers. Waves less than 1 foot.
Wednesday..North winds 10 to 20 knots. Mostly Sunny. Waves 2 to 3 feet.
Rest of today..West winds 5 to 10 knots. Partly Sunny with a chance of showers and Thunderstorms. Waves 1 foot or less.
Tonight..South winds 5 to 15 knots. Partly cloudy with a chance of showers and Thunderstorms. Waves 1 foot or less.
Sunday..Southwest winds 15 to 20 knots. Rain showers likely and a slight chance of Thunderstorms. Waves 1 to 2 feet building to 2 to 4 feet.
Sunday night..Southwest winds 10 to 15 knots veering west 5 to 10 knots toward daybreak. Partly cloudy with a chance of rain showers. Waves 1 to 3 feet.
Monday..Northwest winds 5 to 10 knots. Mostly Sunny. Waves 1 to 2 feet.
Tuesday..Southeast winds around 5 knots veering southwest. Mostly Sunny with a chance of rain showers. Waves less than 1 foot.
Wednesday..North winds 10 to 20 knots. Mostly Sunny. Waves 2 to 3 feet.
LMZ845 Expires:201908172100;;780233
FZUS53 KGRR 171505
NSHGRR
Nearshore Marine Forecast
National Weather Service Grand Rapids MI
1105 AM EDT Sat Aug 17 2019
For waters within five nautical miles of shore on Lake Michigan
LMZ845-172100-
7 Day Forecast for Marine Location Near Breedsville, MI
Hourly EDIT Helplocation: 42.46, -86.13 debug
Area Discussion for - Grand Rapids, MI
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus63 kgrr 171436 afdgrr area forecast discussion national weather service grand rapids mi 1036 am edt Sat aug 17 2019 latest update... update Synopsis Issued at 340 am edt Sat aug 17 2019 - multiple chances for thunderstorms exist through Sunday mainly along and south of i-96. Strong storms are possible, but not a slam dunk. - dangerous swimming conditions are possible Sunday. - a quiet start to the workweek is expected with cooler temperatures prevailing into the weekend. Update Issued at 1036 am edt Sat aug 17 2019 --thunderstorms south of i-96 this afternoon-- the forecast now features strong and possibly severe thunderstorms this afternoon and evening around the i-94 corridor, primarily affecting the kalamazoo, battle creek, and jackson areas. Some of this activity could make a run north towards i-96 but any such storms would not be as strong. Lightning, large hail and damaging winds are the main threats. Forecast reasoning: both recent hrrr runs and radar trends show increasing chances for MCV induced thunderstorms spreading northeast into our southeastern zones. Strongest MCV forcing and thunderstorms are over eastern il and moving east, but we are already seeing some discrete cells developing over NW indiana along an east-west instability axis that may be getting a frontogenetic boost from deformation aloft. SPC mesoanalysis graphics shows a sharp e-w axis of impressive CAPE in the hail growth zone (greater than 600 j kg) combined with sufficient deep layer shear (0-6km bulk values of 30-40 kt) to support discrete supercells. This east-west axis is currently positioned just south of the forecast area, but trends show it drifting north this afternoon. The main times of concern for thunderstorms would be after 3 pm but lasting well into this evening. Discussion (today through next Friday) issued at 340 am edt Sat aug 17 2019 the main forecast concern is the potential for several rounds of thunderstorms over the next 24-48 hours favoring areas south of i- 96, though most activity may hinge on nebulous forcing provided by mvcs traversing in zonal low- to mid-level flow. Hence, confidence is overall lower than average. The first MCV will originate from ongoing widespread (severe) convection across kansas and western missouri this morning. The 00z suite of cams suggest the MCV will ride along a northward-drifting warm front currently located along i-80 with renewed convective development into lower michigan during the afternoon hours (mainly after 21z 4pm). While forecast instability looks meager due to weak lapse rates, forecast shear profiles (enhanced by the MCV itself) suggest modest storm organization would still be attainable. Anytime an MCV tracks along a warm front, there's always concern for localized severe weather and indeed the SPC day 1 marginal risk just clips lower michigan, mainly along and south of i-94. A stray shower or storm will remain possible along the warm front tonight (much like what we're watching across the chicago area as of this writing but not as strong), but most of the area should remain dry. Patchy fog will be possible especially toward sunrise Sunday with just enough low-level winds perhaps encouraging a low- level stratus deck over widespread dense fog. |
Expected widespread convection across parts of the plains this afternoon and evening will likely spit out yet another MCV our way (if not a convective complex) Sunday morning as an upper-level trough approaches from the west. The warm front should slowly lift northward ahead of the MCV which may allow for the maintenance of what's left of the convection as it passes through lower michigan. At this point there's a signal the MCV may arrive a bit too early to take advantage of the upper-level support which will push through later in the day. Unfortunately this casts uncertainty with potential renewed convective development during the afternoon hours associated with the upper-level trough. Forecast shear and thermodynamic profiles would certainly support strong to severe convection, though such a threat may end up south and east of lower michigan where the influence of early-day convection would be less. The SPC day 2 marginal risk is fair given the aforementioned uncertainties. Deterministic and ensemble model guidance suggests continued zonal flow into the early portion of next week with a frontal passage sometime mid-week. Ensemble model guidance is honing in on yet another period of below-normal temperatures into the weekend as persistent troughing becomes established across the eastern united states. Time will tell of such a regime occurs (but we won't complain). Aviation (for the 12z tafs through 12z Sunday morning) issued at 735 am edt Sat aug 17 2019 as expected, the TAF sites along the i-94 corridor (jxn btl azo) have seen patchy fog take cig vis down to lifr at times. This should only last another hour or so before the Sun starts to warm temperatures for the day. Winds will be generally light from the southwest throughout the TAF period. Mid-level clouds start to increase this afternoon as showers and a few thunderstorms start to bubble up across the area. Right now it looks like most of this shower activity will be confined along and south of the i-96 corridor. Thus, we have only mentioned vicinity thunderstorms for the jxn btl azo sites for this afternoon. Once diurnal shower storm activity diminishes this evening, the threat for fog will creep back into the area for Sunday morning. There is still quite a bit of uncertainty over how widespread the fog will become early Sunday morning. The inversion should be strengthening, but at the same time residual cloud cover might inhibit temperatures from cooling down as much. Thus, for now have only mentioned vicinity fog in the tafs, but this will need to be revisited as guidance comes into better agreement today. Marine Issued at 340 am edt Sat aug 17 2019 we are concerned about wind and waves Sunday. South southwest winds and waves will increase during the afternoon hours raising the concern of longshore currents and waves topping piers given the high water levels. Waves look to top off somewhere in the 3-5 ft range, which is right in the dangerous zone where swimmers may not realize how big the waves really area. As such, beach hazard statements may be needed for Sunday. Otherwise, we'll let the day shift take one more look before issuing any products, but beach hazards statements are possible. Calmer conditions are expected to start the workweek. Grr watches warnings advisories Mi... None. Lm... None. Update... Tjt synopsis... Borchardt discussion... Borchardt aviation... Amd marine... Tjt borchardt |
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 |
| SVNM4 - South Haven, MI | 9 mi | 45 min | SW 1.9 G 1.9 | 75°F | ||||
| 45168 | 12 mi | 35 min | W 1.9 G 1.9 | 75°F | 74°F | 1 ft | 1013.7 hPa | 63°F |
| HLNM4 - 9087031 - Holland, MI | 22 mi | 57 min | S 1.9 G 2.9 | 72°F | 1013.1 hPa | 69°F | ||
| 45029 | 31 mi | 35 min | SSW 1.9 G 1.9 | 72°F | 65°F | 1 ft | 1013.1 hPa | 66°F |
| SJOM4 - St. Joseph, MI | 32 mi | 75 min | SW 2.9 G 4.1 | 79°F | 1014.9 hPa (+0.0) | |||
| 45026 - St. Joseph, MI | 42 mi | 35 min | SW 1.9 G 3.9 | 74°F | 75°F | 1 ft | 1013.7 hPa | 67°F |
| MKGM4 - Muskegon, MI | 54 mi | 35 min | WNW 2.9 G 4.1 | 72°F | 1012.9 hPa | 67°F |
Wind History for Holland, MI
(wind in knots) EDIT (on/off) Help| 1 PM | 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 | |
| Last 24hr | S | S | S | SE | S | S | SE G8 | SE G9 | SE G10 | SE G15 | S | S G15 | S | S | S | S | S | S | S | S | S | S | SW | SW |
| 1 day ago | NW G11 | N | NW G10 | N G9 | NW | N | N | NW | NW | N | E | E G8 | E | E | E G9 | SW | NE | SE | SE | SE | E | SE | S | S G8 |
| 2 days ago | NE G11 | NE G12 | NE | NE | E G11 | NE G12 | NE G13 | NE G12 | NE G15 | N | N G12 | N G11 | N G12 | NE G16 | NE G18 | NE G19 | NE G16 | NE G16 | NE G14 | NE G15 | NE G14 | NE G13 | NE G9 | N G8 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| South Haven, South Haven Area Regional Airport, MI | 10 mi | 20 min | N 0 | 10.00 mi | Mostly Cloudy | 79°F | 63°F | 58% | 1013.9 hPa |
| Holland - West Michigan Regional Airport, MI | 20 mi | 22 min | W 7 | 10.00 mi | Fair | 80°F | 62°F | 54% | 1013.8 hPa |
Link to 5 minute data for KLWA
Wind History from LWA (wind in knots)
| 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 | SW | S | S | S | S | S | S | S | Calm | S | S | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | W | W | Calm | |
| 1 day ago | NW | NW | NW G14 | NW G15 | NW | N | NW | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | SE | S | SW | ||||
| 2 days ago | E | W | N | N | N | SE | Calm | Calm | E | E | Calm | Calm | E | NE | NE | NE | NE | NE | NE | E | E | NE | NE | Calm |
Tide / Current Tables for
EDIT Weekend mode (on/off) (on/off) HelpTide / Current Tables for
EDIT (on/off) HelpWeather Map and Satellite Images
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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 (13,3,4,5)
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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. |