Sunday, September20, 2020
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Marine Weather and Tides
Dune Acres, IN

Version 3.4
NOTICE
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 6:32AMSunset 6:49PM Sunday September 20, 2020 6:56 AM CDT (11:56 UTC) Moonrise 10:21AMMoonset 9:03PM Illumination 11% Phase: Waxing Crescent; Moon at 3 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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LMZ779 Expires:202009201515;;085609 Fzus63 Kmkx 200737 Glflm Open Lake Forecast For Lake Michigan National Weather Service Milwaukee/sullivan Wi 237 Am Cdt Sun Sep 20 2020 For Waters Beyond Five Nautical Miles Of Shore On Lake Michigan. Waves Are Provided As A Range Of Significant Wave Heights, Which Is The Average Of The Highest 1/3 Of The Wave, Along With The Average Height Of The Highest 10% Of The Waves Which Will Occasionally Be Encountered.
Synopsis.. High pressure of 30.5 inches centered over the northeast united states will remain nearly stationary through Monday. This will bring persistent southerly winds to lake michigan today and Monday. The winds will be high enough to build significant waves, with the highest waves tonight into Monday across central and northern portions of the lake. Winds will remain southerly Tuesday into Wednesday, though they should be lighter with lower waves also expected. && lmz080-669-671-673-675-777-779-870-872-874-876-878-201515- lake michigan from michigan city in to st. Joseph mi 5 nm offshore to mid lake- lake michigan from sheboygan to port washington wi 5 nm offshore to mid lake- lake michigan from port washington to north point light wi 5 nm offshore to mid lake- lake michigan from north point light to wind point wi 5 nm offshore to mid lake- lake michigan from wind point wi to winthrop harbor il 5 nm offshore to mid lake- lake michigan from winthrop harbor to wilmette harbor il 5 nm offshore to mid lake- lake michigan from wilmette harbor il to michigan city in 5 nm offshore to mid lake- lake michigan from whitehall to pentwater mi 5 nm offshore to mid lake- lake michigan from grand haven to whitehall mi 5 nm offshore to mid lake- lake michigan from holland to grand haven mi 5 nm offshore to mid lake- lake michigan from south haven to holland mi 5 nm offshore to mid lake- lake michigan from st. Joseph to south haven mi 5 nm offshore to mid lake- 237 am cdt Sun sep 20 2020 sheboygan wi to pentwater mi south...
Today..South winds 10 to 15 kt becoming southeast 10 to 20 kt. Waves 3 to 5 ft.
Tonight..Southeast winds 10 to 20 kt becoming south 15 to 25 kt. Waves 4 to 6 ft occasionally to 8 ft.
Monday..South winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft.
Monday night..South winds 10 to 20 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft.
Tuesday..Southwest winds 10 to 15 kt becoming south. Waves 1 to 3 ft.
Tuesday night..Southwest winds 10 to 15 kt. Waves 1 to 3 ft.
Wednesday..Southwest winds 10 to 15 kt becoming south. Waves 1 to 3 ft.
Thursday..Southwest winds 10 to 20 kt becoming west. Waves 2 to 4 ft.
LMZ779


7 Day Forecast for Marine Location Near Dune Acres, IN
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location: 41.87, -87.2     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 201121 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 621 AM CDT Sun Sep 20 2020

SHORT TERM. 304 AM CDT

Through Monday .

An upper ridge axis centered along the mid and upper Mississippi River Valley this morning will drift to the northeastern U.S. through Monday while the area remains placed between high pressure over the eastern CONUS and broad low pressure across the western CONUS. Max temps should be around 70F for most locations today and the mid 70s Monday.

A fairly thick area of western wildfire smoke trapped under the ridge will drift over the area today through at least Monday. HRRR smoke guidance indicates the smoke should be concentrated mainly in a layer from 7-12 kft AGL, so the only impact should be to potentially reduce max temps a degree or two while creating a milky sky. Otherwise, skies should be mostly clear.

Additionally, increasing SSE winds over Lake Michigan tonight will result in waves to around 4 feet for the Lake County (IL) shore. Given the combination of a short window of higher waves during the night, no Beach Hazards Statement was issued.

Kluber

LONG TERM. 304 AM CDT

Monday night through Saturday .

The ongoing quiet period of weather will likely continue through next week. Upper ridging should remain a dominate feature across the region through at least Wednesday as Hurricane Teddy and Tropical Storm Beta create a modest blocking pattern across the western Atlantic and south-central U.S., respectively. While a trough tracking across the northern Canadian prairie provinces will create some weakness in the ridge across the northern Great Lakes on Monday, the associated surface cold front should wash out well northwest of the CWA Monday night.

A stronger trough digging southeast across northern Ontario Wednesday night into Thursday will push a cold front southward into the Upper Mississippi River Valley Wednesday into Thursday. Model guidance continues to trend toward stalling the front north of the CWA on Thursday. Along with limited moisture availability, this supports maintaining a dry forecast through this week. Guidance then suggest a major amplification in the pattern next weekend as a deep trough builds into the central CONUS, with a window of rain chances and embedded thunder as an associated cold front interacts with some residual moisture from Beta.

Seasonably warm conditions are expected Tuesday into at least Saturday, with highs in the upper 70s and lows generally in the 50s. Smoke from the western U.S. wildfires may regulate daytime temps downward by a couple degrees each day as the overall pattern suggests we may continue to see periods of smoke aloft through much of the week.

Kluber

AVIATION. For the 12Z TAFs .

Aviation forecast highlights:

* Southeast winds through the TAF period.

* Smoke from western fires spreads in aloft today.

Terminals remain in western periphery of surface high pressure centered northeast of the Great Lakes this morning. This high pressure ridge will only slowly drift east through Monday, keeping the forecast area in a region of modest southeast surface winds. Winds will tend slightly more south-southeast Monday morning.

Other than some patchy high cirrus later today, skies will be generally cloud-free through the period. Flow aloft will bring smoke from western wildfires back across the area today however, and it will likely linger for a few days. Smoke should generally be 10+ kft, with no surface visibility impacts.

Ratzer

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . None.

Visit us at weather.gov/chicago

Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/NWSChicago www.twitter.com/NWSChicago www.youtube.com/NWSChicago


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MCYI3 - Michigan City, IN 18 mi57 min SE 8.9 G 9.9 50°F 42°F
CHII2 - Chicago, IL 20 mi57 min S 14 G 16 59°F 43°F
CMTI2 - 9087044 - Calumet, IL 20 mi63 min SE 2.9 G 5.1 52°F 1028.8 hPa42°F
CNII2 22 mi42 min S 5.1 G 7 53°F 38°F
OKSI2 23 mi117 min Calm G 1.9 60°F
45174 30 mi37 min SSW 7.8 G 9.7 60°F 65°F1 ft1029.7 hPa48°F
SJOM4 - St. Joseph, MI 41 mi57 min Calm G 2.9 47°F 1030.5 hPa (+1.0)
WHRI2 - Waukegan Harbor, IL 47 mi117 min W 1.9 G 2.9

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Gary Regional Airport, IN21 mi72 minSE 510.00 miClear46°F41°F82%1029.8 hPa
Michigan City Municipal Airport, IN23 mi82 minN 010.00 miFair45°F44°F100%1029.8 hPa

Link to 5 minute data for KGYY

Wind History from GYY (wind in knots)
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Last 24hrSE7SE8SE7SE6E6NE5NE7NE7NE7NE7NE6NE4E3CalmCalmSE3SE3SE3E5CalmCalmSE4SE5SE5
1 day agoE5NE11NE13NE10NE11N12N11N14N12NE12N12N10N6N5NE6NE3E4SE4SE4SE3SE4SE3SE6SE4
2 days agoNE11NE11NE12NE10NE13N12N12N14N14N14N12N10N10N10N8N8
G15
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NE11NE11
G18
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N12E11

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
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 Chicago, IL
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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 numerous 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.