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Marine Weather and Tides
Version 3.4 |
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome. 10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name. |
| Sunrise 6:41AM | Sunset 5:27PM | Sunday February 17, 2019 10:30 PM CST (04:30 UTC) | Moonrise 4:09PM | Moonset 6:19AM | Illumination 98% |  |
LMZ742 Expires:201902181000;;106769 Fzus53 Klot 180309 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 909 Pm Cst Sun Feb 17 2019 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>743-181000- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor-calumet Harbor To Gary- 909 Pm Cst Sun Feb 17 2019
.small craft advisory in effect through Monday morning...
Rest of tonight..Northeast winds 10 to 20 kt. Snow. Waves 3 to 5 ft.
Monday..North winds 20 to 25 kt diminishing to 10 to 20 kt in the afternoon. Snow showers likely in the morning, then slight chance of snow showers in the afternoon. Waves 3 to 5 ft.
Monday night..Northwest winds 10 to 15 kt. Mostly cloudy. Waves 2 to 4 ft subsiding to 1 to 3 ft after midnight.
Tuesday..North winds 5 to 10 kt becoming east in the afternoon. Partly Sunny. Waves 1 to 3 ft subsiding to 1 ft or less in the afternoon. Wave forecast is for ice free areas
.small craft advisory in effect through Monday morning...
Rest of tonight..Northeast winds 10 to 20 kt. Snow. Waves 3 to 5 ft.
Monday..North winds 20 to 25 kt diminishing to 10 to 20 kt in the afternoon. Snow showers likely in the morning, then slight chance of snow showers in the afternoon. Waves 3 to 5 ft.
Monday night..Northwest winds 10 to 15 kt. Mostly cloudy. Waves 2 to 4 ft subsiding to 1 to 3 ft after midnight.
Tuesday..North winds 5 to 10 kt becoming east in the afternoon. Partly Sunny. Waves 1 to 3 ft subsiding to 1 ft or less in the afternoon. Wave forecast is for ice free areas
LMZ742
7 Day Forecast for Marine Location Near Chicago, IL
Hourly EDIT Helplocation: 41.85, -87.6 debug
Area Discussion for - Chicago, IL
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus63 klot 180124 aaa afdlot area forecast discussion... Updated national weather service chicago romeoville, il 724 pm cst Sun feb 17 2019 Update 724 pm cst wintry precipitation continues across the area with a line just south of i-80 being a fairly solid dividing one between snow to the north and primarily freezing drizzle, at times a mix, to the south. The heaviest snow accumulations thus far have been in north central and far northern illinois, so the winter weather advisory continues there for cumulative impacts. An advisory is now also in effect for southern locations where freezing drizzle has been the dominant precipitation type since mid-afternoon and should continue to for the evening. In-between including the heart of the chicago metro area, moderate snow will continue through 10 pm with totals of around two inches favored and impacts a little below that of a winter weather advisory. Bottom line for the cwa is at the least patchy slick roads and to allow extra travel time and have heightened caution. Early evening satellite imagery and 00z soundings depict the broad, slow-moving upper low across the western great lakes, centered to the immediate north-northwest of the cwa. An impressive 185 kt 250 mb jet was sampled at ilx this evening and captures the stout jet streak that has maintained strength of this closed low and resulted in the blossomed area of lift and snow across northern illinois. This upper forcing will shift east- northeast by late evening early overnight, but until then, moderate snow is expected along north of i-80 with one to two inches through 10 pm or so. South of i-80, which is further from the deeper ascent, saturation will remain marginal in the ice nucleation layer and radar, satellite, and observations all support this trend continuing for at least a few hours. In talking with a few law enforcement dispatches in the southern cwa, the ice conditions reported there were worthy of an advisory, especially considering expectations through the remainder of the evening. Behind the aforementioned strong upper forcing, the shearing but still defined upper trough will hang back over the area with saturation better aligning in the -12c to -18c layer. This should allow for periodic light snow during the overnight, including in the far southern CWA as low-mid level cold advection eases its way southward transitioning any freezing drizzle. Additional accumulation overnight looks to be under one inch area wide. Confidence in this is medium to high. For Monday, lake effect snow shower likelihood remains for the morning and could continue into northeast illinois far northwest indiana through the afternoon. This is not an ideal setup due to low inversion heights from minimal cold advection, but the cloud layer is forecast to intersect the snow growth layer and a convergent axis is part of this setup. Thus light to possibly brief moderate snow showers look like a fair bet for at least a period. Further refinement of the best placement and duration will be made into the overnight as confidence is low on those key characteristics at this time, but for now some minor snow accumulation (primarily <1.5 inches) will likely be seen in some parts of far northeast illinois during the day Monday and possibly even into early evening depending on the persistence of the convergence. Mtf Short term 235 pm cst through tonight... after a period of moderate to briefly heavy snow this morning across the NW half of the cwa, deeper moisture has briefly departed ahead of an approaching upper-low. Weak low-level WAA and the loss of some ice aloft has allowed light snow to mix with or change over to freezing drizzle generally south of i-88 early this afternoon. As the upper low over ia nears over the next few hours, thermo profiles will once again become supportive of all snow. Radar imagery depicts this transition zone across the western cwa, with arrival time of 3:30-4:30pm for the chicago metro. Light snow will then continue into the mid-evening before the upper-low begins to exit to the east while slowly weakening and becoming more sheared. This should allow snow to end for nearly the entire area away from lake mi by around midnight, though very light snow may linger into the overnight as the western extent of the sheared-out trough slowly shifts east. Snow totals mid-afternoon through this evening should range from less than a 0.5" south to up 2" north of i-88. Near lake michigan, embedded lake enhancement across primarily lake county(il) will support higher snow totals this evening, with amounts up to 3" there. Thermo profiles will remain marginally supportive of les across lake county into cook county overnight into Monday morning, with an additional 1" possible for these locations. The set-up looks favorable for a ragged band of les showers slowly transitioning southward overnight into Monday morning, with any location seeing about a 1-2 hr window of moderate snow showers. The only headline adjustment was to move up the end time of the mchenry county advisory from 12z to 06z tonight as much of the les activity overnight should remain confined to lake county. The advisories away from lake county continue until midnight, but could be canceled early if light snow diminishes quick enough this evening. |
Kluber Long term 338 pm cst Monday through Sunday... main forecast concerns challenges are with continued potential for lake effect snow showers on Monday, and then with increasing chances for accumulating snow and possible wintry mix by mid week. Surface low trough will continue to pull away at the start of the period, with low level flow veering to more of a northerly direction. As this occurs, expect chances for lake effect snow to increase across portions of far northeast il and northwest in Monday morning. Although lake effect snow may already be ongoing across parts of lake il county, expect greater focus with possibly higher intensity snow to swing down the lake and across locations right near the shore. Guidance is showing some increase to the inversion heights and delta TS late tonight into Monday. This trend with the thermal profiles over the lake and with the upstream low level convergent axis to shift down the lake Monday morning, feel confident for a progressive area of lake effect snow to impact areas adjacent to the shore. Confidence not overly high with amounts but given the anticipated thermal profiles and limited residence time of this, don't think amounts will be too high. No real change from the previous forecast with additional snowfall amounts, with additional amounts around an inch expected. Some additional flurries may occur across northwest in in the afternoon, but expect the bulk of this snow to end during this time. High pressure expected to build across the region late Monday into Tuesday, with dry weather likely. Still monitoring the next system to provide another round of winter weather to the region by mid week. Upper level trough and attendant surface low trough expected to move through the central conus Tuesday into Tuesday night. Out ahead of these features, strong WAA will assist for an expanding precip shield to move across the CWA late Tuesday night through Wednesday morning. At this time, have high confidence of precip occurring and for this to be all snow late Tuesday night. However, confidence lowers with precip type Wednesday morning through midday. Guidance varying to the northward extent of the warm nose and with the duration of deeper moisture. It is appearing though that this snow could transition over to freezing rain Wednesday morning for areas south of i80. Some guidance showing this potential into the i-88 corridor, but have lower confidence with this potential. Did trend the forecast this way though given latest guidance, bringing chances for freezing rain further north. Stronger forcing should depart Wednesday afternoon, with precip chances quickly ending. A period to continue to monitor, as accumulating snow is appearing likely across the region, along with the potential for ice accumulation. Rodriguez Aviation For the 06z tafs... 608 pm... Forecast concerns include light snow through tonight and lake effect snow showers Monday morning. Precipitation has switched back to mainly light snow across northern il with light freezing drizzle still possible across northwest il and for areas south of interstate 80 this evening. The light snow is expected to persist though late evening and likely into the overnight hours. The low levels currently are expected to stay cool enough to support mainly light snow or flurries overnight at the terminals. However... Some patchy freezing drizzle can not be completely ruled out but the chance currently looks small enough to keep out of this forecast. Lake effect snow showers are expected to develop during the early morning hours and the best timing for these to affect ord mdw would be just before around daybreak. Lake effect snow showers into northeast il are often challenging and can sometimes occur just east of ord mdw. Guidance has not changed much so maintained current tempo mention and its possible that any changes may not be made until these lake effect snow showers actually develop later tonight. These snow showers should shift into northwest indiana by mid morning affecting gyy. Northeast winds 10-12kts will slowly turn more northerly overnight and then to the north northwest Monday morning though only medium confidence for timing these shifts. MVFR CIGS expected to continue through the period withVFR CIGS possible at rfd by Monday afternoon. Cms Lot watches warnings advisories Il... Winter weather advisory... Ilz003-ilz004-ilz005-ilz008-ilz010- ilz011-ilz019-ilz023-ilz032-ilz033-ilz039 until midnight Monday. Winter weather advisory... Ilz006 until 6 am Monday. In... Winter weather advisory... Inz010-inz011-inz019 until midnight Monday. Lm... Small craft advisory... Winthrop harbor to gary in until noon Monday. 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 |
| CNII2 | 1 mi | 15 min | NE 4.1 G 6 | 26°F | 24°F | |||
| CHII2 - Chicago, IL | 5 mi | 30 min | NE 8.9 G 9.9 | 28°F | 27°F | |||
| JAKI2 | 5 mi | 90 min | E 5.1 G 8 | 28°F | ||||
| CMTI2 - 9087044 - Calumet, IL | 9 mi | 30 min | ENE 8.9 G 9.9 | 27°F | 1012.5 hPa (+1.4) | 26°F | ||
| FSTI2 | 9 mi | 90 min | NE 17 | 27°F | ||||
| BHRI3 - Burns Harbor, IN | 28 mi | 50 min | E 6 G 7 | 26°F | 1013.2 hPa | |||
| MCYI3 - Michigan City, IN | 37 mi | 30 min | NE 8 G 8.9 | 26°F | 24°F | |||
| WHRI2 - Waukegan Harbor, IL | 37 mi | 50 min | ENE 8.9 G 11 | 27°F |
Wind History for Calumet Harbor, IL
(wind in knots) EDIT (on/off) Help| 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 | 9 PM | |
| Last 24hr | E G16 | E G18 | E G18 | E G13 | E | E G13 | E G13 | E G13 | E G15 | E G15 | E G14 | E | E | E G14 | NE G13 | NE G14 | NE G11 | NE G11 | NE G11 | NE G11 | NE G13 | NE | E G8 | NE G11 |
| 1 day ago | W G7 | W G8 | W G7 | W G9 | W G8 | W G8 | W G7 | NW | W | W | NW | NW G10 | NW G11 | N G8 | NE G11 | NE G12 | NE G16 | NE G15 | NE G16 | NE G10 | NE G11 | NE G11 | NE G14 | NE G17 |
| 2 days ago | W G13 | W G18 | W G19 | W G17 | W G16 | SW G20 | W G18 | W G13 | W G15 | W G14 | W G14 | SW G13 | SW G15 | SW G16 | W G14 | W G16 | W G11 | SW G8 | W G9 | W G8 | W | NW | NW G9 |
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, Chicago Midway Airport, IL | 9 mi | 37 min | NE 6 | 1.00 mi | Light Snow Fog/Mist | 27°F | 25°F | 92% | 1014.2 hPa |
| Chicago, Chicago-O'Hare International Airport, IL | 18 mi | 39 min | N 9 | 2.50 mi | Light Snow Fog/Mist | 25°F | 24°F | 96% | 1013.8 hPa |
| Gary Regional Airport, IN | 19 mi | 45 min | N 0 | 2.00 mi | Light Snow Fog/Mist | 28°F | 26°F | 93% | 1012.9 hPa |
| Lansing Municipal Airport, IL | 22 mi | 35 min | N 0 | 2.50 mi | Light Snow | 27°F | 25°F | 95% | 1012.9 hPa |
| Chicago / Wheeling, Pal-Waukee Airport, IL | 24 mi | 38 min | NNE 4 | 1.75 mi | Light Snow Fog/Mist | 27°F | 23°F | 85% | 1014.6 hPa |
Wind History from MDW (wind in knots)
| 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 | 9 PM | 10 PM | |
| Last 24hr | E | E G22 | E | E | E | E | E | E | E | E | E | E G20 | E | E | E | E | NE | E | NE | NE | NE | NE | N | NE |
| 1 day ago | NW | NW | NW | NW | NW | NW | NW | NW | NW | N | N | NW | N | N | NE | E | NE | E | E G19 | E | NE | E | E | E |
| 2 days ago | W G25 | W G27 | W G26 | W G31 | W G21 | W G21 | W G24 | W G21 | W | W G21 | W G22 | W G20 | W G19 | W | W | W G21 | W | W | NW | NW | NW | NW | NW | NW |
Tide / Current Tables for
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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
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Wind Forecast for Chicago, IL (23,6,7,8)
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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. |