Marine Weather and Tides
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 6:07AM||Sunset 9:17PM||Friday May 29, 2020 10:13 PM EDT (02:13 UTC)||Moonrise 11:44AM||Moonset 1:26AM||Illumination 55%|
7 Day Forecast for Marine Location Near Pentwater, MIHourly EDIT Help
Area Discussion for - Grand Rapids, MI  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KGRR 300044 AFDGRR
Area Forecast Discussion National Weather Service Grand Rapids MI 844 PM EDT Fri May 29 2020
LATEST UPDATE . Aviation
SYNOPSIS. Issued at 257 PM EDT Fri May 29 2020
- Cool Weekend Still on Track With Frost Potential Sunday AM
- Warmer Next Week With a Few Chances for Rain
DISCUSSION. (This evening through next Friday) Issued at 257 PM EDT Fri May 29 2020
--Cool Weekend Still on Track With Frost Potential Sunday AM--
No significant changes to our forecast for this weekend. With 850 mb temperatures dropping into the single digits Saturday we should see afternoon cumulus develop with perhaps some sprinkles or light showers at times away from our coastal region. The cumulus will be fairly shallow so we are not expecting much in the way of rainfall and most locations should stay dry.
Frost potential still exists Sunday morning mainly across interior Central Lower Michigan. This region will likely get down into the low to mid 30s so frost looks like a good bet. Elsewhere, many locations will bottom out in the upper 30s. These types of temperatures should not damage agriculture. Near and north of U.S. 10, some spots could flirt with freezing. Consider taking precautions Saturday night to protect your vegetation especially in this region.
For climatological perspective, the record low temperature for Grand Rapids on Sunday is 36 degrees in 1966. The ECMWF has 38 for a low, so that is not far off from record territory.
--Warmer Next Week With a Few Chances for Rain Mainly at Night--
Model guidance continues to indicate rising upper level heights early next week with a surge of warmer air as seen at 925/850 mb. On Monday, there will likely be some showers and thunderstorms across Wisconsin. While some models show this activity spreading into northern Lower MI and the U.P., the N/S oriented 1000-500 mb thickness pattern and a veering 40 kt LLJ across the Midwest into Monday night suggest this activity will try to work into our region. You can also tell by the mean 850-300 mb wind that shower and thunderstorm activity in Wisconsin will try to move SE into our region Monday night. Total rain amounts are in question with ensemble guidance still fairly scattershot with which locations may get the heavier precipitation.
Tuesday night into Wednesday, the pattern looks similar to me. One difference is the MUCAPE is projected to be higher across the region. There may be a better risk for thunderstorms with a similar looking LLJ moving in and higher precipitable water content than Monday night. Some heavier rainfall may materialize, according to the ECMWF, but the GFS and GEM hold off this pattern until later Wednesday into Wednesday night. The spread in ensemble guidance still casts uncertainty on how this will play out. At this point, there is a decent chance that much of the daylight hours next week will be dry with just some of these nocturnal events to focus on.
AVIATION. (For the 00Z TAFS through 00Z Saturday evening) Issued at 843 PM EDT Fri May 29 2020
VFR weather is expected the next 24 hours. Skies this evening will be clear to scattered for the most part, but there are broken clouds moving in off Lake Michigan with ceilings in the 5,000ft to 7,000ft. After daybreak on Saturday ceilings will likely lower or fill in around the 3,500ft to 4,000ft layer. Again though conditions will be VFR. We are not expecting any restriction to visibility.
Winds will taper off considerably in the next hour or two in all areas to northwest at 4 to 10 knots. Winds will pick up again Saturday afternoon out of the northwest at 10 to 20 knots.
MARINE. Issued at 257 PM EDT Fri May 29 2020
Winds and waves should largely be non-hazardous to small craft this weekend. Looks like the highest waves will be Saturday evening into Sunday morning especially from Holland southward when conditions could approach SCA criteria.
HYDROLOGY. Issued at 257 PM EDT Fri May 29 2020
Rivers continue declining across the region but high flows are still noted at several locations. The Grand River at Robinson Twp is still above flood stage. All other rivers have fallen back below flood stage. The dry weekend will allow rivers to continue retreating.
GRR WATCHES/WARNINGS/ADVISORIES. MI . None. LM . None.
SYNOPSIS . Hoving DISCUSSION . Hoving AVIATION . Duke HYDROLOGY . Hoving MARINE . Hoving
Weather Reporting StationsEDIT (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|
|BSBM4 - Big Sable Point, MI||20 mi||93 min||W 8.9 G 11||56°F||1016.9 hPa|
|MEEM4 - Manistee Harbor, MI||33 mi||93 min||WSW 7 G 8.9||56°F||1017.3 hPa|
|MKGM4 - Muskegon, MI||39 mi||43 min||N 8 G 8.9||58°F||1016.8 hPa||51°F|
Wind History for Ludington, MI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Ludington, Mason County Airport, MI||12 mi||78 min||WNW 3||10.00 mi||Overcast||58°F||51°F||77%||1016.3 hPa|
Link to 5 minute data for KLDM
Wind History from LDM (wind in knots)
|1 day ago||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||W||S||SW|
|2 days ago||Calm||Calm||Calm||SE||SE||SE||S||Calm||SE||E||Calm||S||SW||SW||W||W||SW||SW||W||SW||SW||W||Calm||Calm|
EDIT Weekend mode (on/off) (on/off)  Help
EDIT (on/off)  Help
Weather Map(on/off)  Help Weather Map
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
Wind Forecast for Grand Rapids, MI (22,6,7,8)(on/off)  Help
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