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Marine Weather and Tides
Version 3.4 |
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 8:03AM | Sunset 5:49PM | Friday January 22, 2021 8:11 PM EST (01:11 UTC) | Moonrise 1:01PM | Moonset 2:38AM | Illumination 72% | ![]() |
LMZ844 St Joseph To South Haven Mi- 405 Pm Est Fri Jan 22 2021
.small craft advisory in effect until 3 am est Saturday...
Through early evening..Northwest winds 20 to 25 knots. Mostly cloudy with a chance of snow showers. Waves 5 to 7 feet.
Tonight..Northwest winds 10 to 20 knots. Mostly cloudy with a chance of snow showers. Waves 5 to 7 feet.
Saturday..West winds around 10 knots backing southwest late in the day. Mostly cloudy with a chance of snow showers. Waves 2 to 3 feet subsiding to 1 to 2 feet.
Saturday night..Southeast winds 10 to 20 knots. Cloudy with a chance of snow. Waves around 1 foot.
Sunday..Southeast winds 10 to 20 knots. Cloudy with a slight chance of snow. Waves around 1 foot.
Sunday night..East winds around 10 knots backing northeast after midnight. Mostly cloudy. Waves around 1 foot.
Monday..Northeast winds 15 to 25 knots. Cloudy with a chance of snow. Waves 1 to 3 feet building to 2 to 4 feet late in the day.
Tuesday..Northeast winds 15 to 25 knots. Partly Sunny. Waves 3 to 5 feet subsiding to 1 to 3 feet late in the day.
Wednesday..East winds around 15 knots. Partly Sunny. Waves around 1 foot.
.small craft advisory in effect until 3 am est Saturday...
Through early evening..Northwest winds 20 to 25 knots. Mostly cloudy with a chance of snow showers. Waves 5 to 7 feet.
Tonight..Northwest winds 10 to 20 knots. Mostly cloudy with a chance of snow showers. Waves 5 to 7 feet.
Saturday..West winds around 10 knots backing southwest late in the day. Mostly cloudy with a chance of snow showers. Waves 2 to 3 feet subsiding to 1 to 2 feet.
Saturday night..Southeast winds 10 to 20 knots. Cloudy with a chance of snow. Waves around 1 foot.
Sunday..Southeast winds 10 to 20 knots. Cloudy with a slight chance of snow. Waves around 1 foot.
Sunday night..East winds around 10 knots backing northeast after midnight. Mostly cloudy. Waves around 1 foot.
Monday..Northeast winds 15 to 25 knots. Cloudy with a chance of snow. Waves 1 to 3 feet building to 2 to 4 feet late in the day.
Tuesday..Northeast winds 15 to 25 knots. Partly Sunny. Waves 3 to 5 feet subsiding to 1 to 3 feet late in the day.
Wednesday..East winds around 15 knots. Partly Sunny. Waves around 1 foot.
LMZ844 Expires:202101230900;;327563
FZUS53 KGRR 222105
NSHGRR
Nearshore Marine Forecast
National Weather Service Grand Rapids MI
405 PM EST Fri Jan 22 2021
For waters within five nautical miles of shore on Lake Michigan
LMZ844-230900-
7 Day Forecast for Marine Location Near Lake Michigan Beach, MI
Hourly EDIT Help
location: 42.22, -86.48 debug
Area Discussion for - Northern Indiana, IN
  (on/off)  Help NOTE: mouseover dotted underlined text for definitionFXUS63 KIWX 230045 AFDIWX
Area Forecast Discussion National Weather Service Northern Indiana 745 PM EST Fri Jan 22 2021
SYNOPSIS. Issued at 410 PM EST Fri Jan 22 2021
Lake effect clouds and flurries will persist into this evening before diminishing late tonight into Saturday morning. Some sun is expected on Saturday but it will remain cold with high temperatures in the upper 20s. A weak system will bring a low chance of some light snow on Sunday, but little to no snow accumulation is expected. Looking ahead, the potential exists for a more significant winter storm Monday into Tuesday morning. An axis of heavy snow is possible with this system along with a wintry mix of precipitation for some locations. Confidence remains low on the details regarding the placement of the heaviest precipitation. Stay tuned for updates on this potential winter storm for early next week.
SHORT TERM. (This Evening through Saturday) Issued at 410 PM EST Fri Jan 22 2021
Lake effect clouds and light snow showers/flurries continue across northern Indiana/southern Lower Michigan this afternoon. Inversion heights are relatively low at around 4k feet and low/mid level moisture is lacking. Water vapor imagery this afternoon indicates local area situated between weak upper short waves with the next upstream short wave dropping southeast out of southwest Wisconsin. Similar low level thermal/moisture profiles and brief increase in forcing with this short wave should support continuation of this light lake effect precip into this evening. A dusting of accumulation is possible north of Highway 6 and especially across southern Lower Michigan.
Low level thermal trough will modify some across southern Great Lakes/Ohio Valley tonight but clearing of clouds away from Lake effect and diminishing winds with incoming anticyclone should allow for efficient radiational cooling conditions and low temperatures dropping into the 10 to 15 degree range for low temps.
Backing low level winds with approach of anticyclone should shut off lake effect clouds on Saturday with most areas seeing a good deal of sun. Onset of weak warm advection aloft may temper mixing a bit, which should limit high temps from upper 20s to lower 30s given lingering effects of retreating low level thermal trough.
LONG TERM. (Saturday Night through Friday) Issued at 410 PM EST Fri Jan 22 2021
The main focus for the long term period will continue to center on the Monday through early Tuesday time period, with confidence continuing to gradually increase in at least portions of the area receiving an axis of heavy snow and wintry mix. Confidence in more precise details will still need to be fine tuned.
In the meantime for Saturday night/Sunday low level jet will begin to ramp up downstream of southwest CONUS upper trough, with weak induced short wave ridging advecting across the southern Great Lakes. Speed convergence at the nose of this jet coupled with accompanying respectable positive low level theta-e advective forcing should result in increase in precip. Without a good deal of mid and upper level support, extent of precip chances still in question for this period and will continue idea from previous forecast in maintaining just low chance PoPs. Expecting mainly snow with exception of areas south of Highway 24 across northern Indiana where lack of ice nucleation may be an issue and where weak elevated warm layer may develop. This could manifest as very low end potential of some brief freezing drizzle/rain or just light rain. With very marginal sfc temps, expecting little to no impacts for Sunday.
Trends in latest guidance still support potential for a more significant winter storm to impact the area Monday into the early morning hours Tuesday. Broad warm/moist advection will be ongoing Sunday night into first part of Monday with some renewed precip chances from south to north. Precip type issues could arise with warm layer aloft early Monday, but potential does exist that advection may be strong enough across the far south to support mainly just rain. Some question as to how widespread precip shield will be with this advective forcing into mid afternoon given lagging stronger mid/upper level in form of northeast ejecting upper level wave lifting northeast from southern/central Plains.
Ensemble means have been depicting a slow northward drift past few cycles, particularly the GEFS mean, which appears to have come more inline with ECMWF. Have generally bought in on WPC preference to this northward EC ensemble mean solution blended with some deterministic run influence. It appears one of the big factors that will determine where axis of heavier snow sets up is just how quickly the aforementioned upper wave is dampened by confluent mid/upper flow across the southern Great Lakes. Some timing discrepancies persist in guidance likely also arising from how this wave interacts with this confluent flow.
Overall, period of greatest concern appears to be late Monday afternoon into the early overnight hours Monday night with potential of greatest snowfall rates in stronger potential deformation forcing setup. Confidence continues to increase that at least portions of the area will see some heavy snow, but will still need to resolve above details for clearer picture. One item of lower confidence is northward extent of low level warm layer which will also be dependent on how the mid/upper level wave evolves as it tracks across the region. Given potential of some mixed precip issues across southern half of the area, and what should be fairly strong frontogenetic response, axis of heaviest snow may be somewhat narrow in scope. Still alot to resolve with this forecast, but hopefully will get a clearer picture as this disturbance across Pacific coast becomes better sampled over next 24 hours.
It does appear snow should be rather wet in nature with ratios expected to be on the order of 10-13:1, likely tapering lower to the south. Northeast winds are expected to strengthen into the 15 to 25 mph range by Monday evening with some higher gusts possible. Snow should taper overnight Monday night into Tuesday morning although confidence in ending times of accumulating snow is somewhat lower given more quickly dampening, but slower solution offered by EC.
Another system will need to be watched for the Wednesday-early Thursday timeframe. Have utilized blended consensus PoPs although signals may be increasing for higher PoPs this period. No major changes were made post-Tuesday at this time.
AVIATION. (For the 00Z TAFS through 00Z Saturday Evening) Issued at 701 PM EST Fri Jan 22 2021
Conditions should gradually improve at SBN as inversion heights slowly fall. Radar indicated cloud tops were already under 060. Started out SBN with IFR visibilities below 3 miles. Conditions should improve overnight with VFR conditions at both sites as high pressure settles over the region.
IWX WATCHES/WARNINGS/ADVISORIES. IN . NONE. MI . NONE. OH . NONE. LM . Small Craft Advisory until 4 AM EST Saturday for LMZ043-046.
SYNOPSIS . Marsili SHORT TERM . Marsili LONG TERM . Marsili AVIATION . Skipper
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Weather Reporting Stations
EDIT (on/off)  Help NOTE: Click on distance to see the station location on a mapStations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
SJOM4 - St. Joseph, MI | 8 mi | 71 min | NW 13 G 17 | 21°F | 1022.7 hPa (+1.4) | |||
SVNM4 - South Haven, MI | 16 mi | 41 min | 21 G 25 | 21°F | ||||
HLNM4 - 9087031 - Holland, MI | 41 mi | 53 min | NW 18 G 23 | 22°F | 33°F | 1021.3 hPa | 13°F | |
MCYI3 - Michigan City, IN | 41 mi | 41 min | NNW 16 G 18 | 20°F | 8°F |
Wind History for Holland, MI
(wind in knots) EDIT (on/off)  Help8 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 | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | |
Last 24hr | NW | W G27 | W G32 | W | W G32 | NW G30 | NW | NW | NW G28 | NW | NW G28 | NW G29 | NW G22 | NW | NW G26 | NW G26 | NW G22 | NW G20 | NW | NW | NW | NW G23 | NW G21 | NW |
1 day ago | S | S | SW | SW G40 | SW | SW G32 | SW G28 | SW | W | W G21 | W G19 | W | W | W | W | W G24 | W G27 | SW G28 | SW | W | W | W | W G26 | NW G27 |
2 days ago | NW G13 | N G21 | NW | NW G25 | NE G11 | N G8 | NW | NW G24 | NW G26 | NW G24 | NW G17 | W G15 | W G12 | SW | SW | SW G22 | SW G23 | SW | S | S G29 | S G29 | S | S G26 | S G23 |
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 |
Southwest Michigan Regional Airport, MI | 6 mi | 18 min | NW 7 | 10.00 mi | Overcast | 21°F | 10°F | 62% | 1024 hPa |
South Haven, South Haven Area Regional Airport, MI | 15 mi | 16 min | NW 9 | 10.00 mi | Overcast | 21°F | 11°F | 65% | 1022.7 hPa |
Link to 5 minute data for KBEH
Wind History from BEH (wind in knots)
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 | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | |
Last 24hr | W G28 | W G29 | NW G25 | NW G23 | W G25 | NW G21 | NW G21 | NW G21 | NW G22 | N G20 | NW G19 | NW G20 | NW G20 | NW G22 | NW G20 | NW G19 | NW G19 | NW G21 | NW G20 | NW | NW G19 | NW G16 | NW | NW |
1 day ago | S G20 | SW G18 | SW G24 | SW G30 | SW G31 | W G29 | SW G23 | W G24 | W | W | W | W | W | W G25 | W G24 | W G27 | W G29 | W G27 | W G34 | W G27 | W G29 | W G25 | W G27 | W G23 |
2 days ago | W G29 | NW G20 | G20 | N | NW G17 | NW G24 | NW G23 | NW G21 | NW G15 | NW | NW | W | W | W | SW | SW | S | S | S | S G19 | S G19 | S G21 | S G25 | SW G23 |
Tide / Current Tables for
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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
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