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Marine Weather and Tides
Version 3.4 |
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues. 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. |
| Sunrise 5:59AM | Sunset 7:39PM | Friday April 20, 2018 3:22 PM CDT (20:22 UTC) | Moonrise 9:41AM | Moonset 12:00AM | Illumination 29% |  |
Marine Forecasts
EDIT (on/off) Help| LMZ741 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor-calumet Harbor To Gary- 256 Pm Cdt Fri Apr 20 2018 Tonight..East winds 5 to 10 kt. Mostly clear in the evening then becoming mostly cloudy. Waves 1 to 2 ft. Saturday..Northeast winds 5 to 10 kt. Mostly cloudy. Waves around 1 ft. Saturday night..Northeast winds 5 to 10 kt. Mostly cloudy. Waves around 1 ft. Sunday..Northeast winds 10 to 15 kt. Mostly Sunny. Waves around 1 ft building to 1 to 3 ft in the afternoon. | LMZ741 Expires:201804210330;;247761 FZUS53 KLOT 201956 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 256 PM CDT Fri Apr 20 2018 For waters within 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 waves, along with the average height of the highest 10 percent of the waves which will occasionally be encountered. LMZ740>743-210330- |
7 Day Forecast for Marine Location Near Evanston, IL
Hourly EDIT Helplocation: 42.03, -87.69 debug
Area Discussion for - Chicago, IL
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus63 klot 201935 afdlot area forecast discussion national weather service chicago romeoville, il 235 pm cdt Fri apr 20 2018 Short term 158 pm cdt tonight through Saturday... quiet weather takes us into the weekend, though increasing mid high clouds and modest easterly winds will keep temps near but just below average. Early afternoon surface analysis indicates surface high pressure spread across the upper mississippi valley and western great lakes region. Dry air, plenty of Sun and light winds have produced a pleasant spring day, though a lake breeze has pushed in off the lake keeping lake shore areas in the 40's this afternoon while other areas approach 60 degrees. The surface high will continue to drift eastward tonight and Saturday, becoming centered across the central and eastern lakes by Saturday evening. Further west, a closed upper low near the four corners region will cross the southern rockies by tomorrow morning, with diffluent upper level flow downstream into the midwest resulting in an increase in mid and high cloud cover across the region from late tonight through the day Saturday. With low level winds from the east, and the thickening high cloud cover, 925 mb temps are progged about 2c lower than today, supporting MAX temps in the mid-upper 50's for the most part, while onshore winds again limiting locations along the shore of lake michigan to the mid 40's. Winds generally 10 mph or less however, making it feel much better than last weekend. Ratzer Long term 233 pm cdt Saturday night through Friday... Saturday night through Monday: quiet weather will continue through the start of this forecast period as mid-level ridging crosses the area while a mid-level lows drifts eastward across the southern states. Filtered sunshine is expected Sunday and Monday as a result of passing mid to high-level clouds from the low to the south. This should keeps MAX temps a few degrees below what would be expected with the airmass over the area. Light easterly gradient flow will also keep shoreline temps cooler. Tuesday and Wednesday: troughing over the northern great plains will begin to cut-off from the larger-scale flow over the upper mississippi river valley Tuesday evening, with the low drifting across illinois on Wednesday. An associated surface low will cross southern wisconsin while weakening Tuesday night. Conditions should remain dry through Tuesday afternoon, and likely Tuesday |
evening, before the mid-level low nears. Given the lack of organized forcing, will maintain chance pops for most of the area late Tuesday night into Wednesday evening. Thursday and Friday: a broad upper trough will redevelop across eastern canada and new england as the two aforementioned lows are absorbed into a strong trough over the central u.S. While guidance agrees on the development of this trough, there is disagreement on the evolution. There should be a few chances for showers during this time as temps drop back to seasonably cool levels for late april. Kluber Aviation For the 18z tafs... no significant aviation concerns next 24-30 hours. Surface high pressure drifting east across the area early this afternoon, with calm or light variable winds predominant. Lake breeze has developed and begun to move inland off lake michigan per ord tdwr data, and extrapolation of the boundary would suggest it will arrive at mdw by 19z and ord by 1930z. Some airport sensors already showing some light NE or E component per cwsu zau, prior to lake breeze boundary passage. With surface high off to the east of the terminals tonight and Saturday, modest east flow is expected to persist.VFR conditions will prevail, though with a thickening and gradual lowering of high and mid cloud late tonight into the day Saturday. Ratzer Marine 233 pm cdt generally quiet conditions with winds under 20 knots are expected for lake michigan through Tuesday as high pressure drifts across the western great lakes. Weakening low pressure will cross southern lake michigan early Wednesday morning as a ridge builds into the upper mississippi river valley, supporting a period of northerly winds to 25 knots Wednesday into Wednesday night. Kluber Lot watches warnings advisories Il... None. In... None. Lm... None. Visit us at http: weather.Gov chicago (all lowercase) follow us on facebook... Twitter... And youtube at: |
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 |
| FSTI2 | 4 mi | 143 min | ESE 5.1 | 42°F | ||||
| OKSI2 | 9 mi | 143 min | E 5.1 G 5.1 | 42°F | ||||
| CHII2 - Chicago, IL | 10 mi | 33 min | E 9.9 G 9.9 | 46°F | ||||
| CNII2 | 13 mi | 23 min | NE 1.9 G 4.1 | 44°F | 35°F | |||
| JAKI2 | 18 mi | 143 min | E 4.1 G 6 | 44°F | ||||
| CMTI2 - 9087044 - Calumet, IL | 22 mi | 53 min | NE 8 G 8.9 | 43°F | 1031.8 hPa | 30°F | ||
| WHRI2 - Waukegan Harbor, IL | 24 mi | 43 min | SSE 2.9 G 5.1 | 47°F | ||||
| KNSW3 - Kenosha, WI | 39 mi | 83 min | 44°F | 1032.5 hPa (-1.0) | ||||
| BHRI3 - Burns Harbor, IN | 39 mi | 43 min | ENE 7 G 8 | 44°F | 1032.8 hPa | |||
| MCYI3 - Michigan City, IN | 46 mi | 33 min | NNE 5.1 G 6 | 40°F | 33°F |
Wind History for Calumet Harbor, IL
(wind in knots) EDIT (on/off) Help| 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 | 3 PM | |
| Last 24hr | N G14 | N G13 | N | N | N | NW | SW | W G8 | W | SW | W | W | SW | W G6 | W | N | N | N | NE | NE | NE | NE | NE | NE |
| 1 day ago | N G17 | N G18 | N G17 | NW G14 | NW G12 | W G8 | W G11 | W G11 | W G11 | N G21 | N G22 | N G20 | N G18 | N G20 | NW G20 | NW G22 | NW G17 | NW G22 | NW G22 | NW G20 | N G17 | NW G20 | N G12 | N G19 |
| 2 days ago | NE G11 | NE G12 | NE G14 | NE | NE G11 | NE G10 | NE | NE | NE | NE G10 | NE | NE G11 | E | E G13 | E G10 | E G14 | E G16 | E G17 | NE G20 | NE | NE G20 | NE G23 | N G21 | N G17 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Chicago / Wheeling, Pal-Waukee Airport, IL | 12 mi | 31 min | N 0 | 10.00 mi | Fair | 59°F | 21°F | 23% | 1032.6 hPa |
| Chicago, Chicago-O'Hare International Airport, IL | 12 mi | 32 min | E 3 | 10.00 mi | Partly Cloudy | 59°F | 18°F | 20% | 1031.6 hPa |
| Chicago, Chicago Midway Airport, IL | 17 mi | 30 min | ENE 10 | 10.00 mi | Mostly Cloudy | 59°F | 17°F | 19% | 1032.2 hPa |
Wind History from PWK (wind in knots)
| 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 | 3 PM | |
| Last 24hr | N | N | NW | NW | NW | NW | W | NW | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | N | E | Calm | Calm | NW | NE | Calm | |
| 1 day ago | NE | N | N | N | N | NW | NW | NW | N | N | N G22 | N | N | N | N | N | N | N | N | N | NW | N | NW | N |
| 2 days ago | NW G16 | N | N | E | E | E | Calm | N | Calm | Calm | NE | Calm | Calm | NE | E | E G18 | E G15 | E G18 | E G21 | E G21 | NE G20 | NE G20 | NE G17 |
Tide / Current Tables for
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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.
target = "new">Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Chicago, IL (16,3,4,5)
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Ground Weather Radar Station Chicago, IL
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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. |