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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 5:23AM | Sunset 8:10PM | Tuesday May 21, 2019 2:07 PM CDT (19:07 UTC) | Moonrise 11:06PM | Moonset 7:40AM | Illumination 92% |  |
LMZ742 Expires:201905212115;;223463 Fzus53 Klot 211359 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 859 Am Cdt Tue May 21 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>743-212115- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor-calumet Harbor To Gary- 859 Am Cdt Tue May 21 2019
.small craft advisory in effect from 4 pm cdt this afternoon through Wednesday evening...
Rest of today..East winds to 30 kt. Rain showers likely. Waves 2 to 4 ft building to 3 to 5 ft late.
Tonight..East winds to 30 kt becoming southeast in the evening then diminishing to 15 to 25 kt overnight. Showers likely and a slight chance of Thunderstorms in the evening, then showers with Thunderstorms likely after midnight. Waves 5 to 8 ft occasionally to 10 ft.
Wednesday..South winds 20 to 25 kt. Slight chance of showers in the morning. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft in the afternoon.
Wednesday night..Southwest winds 15 to 20 kt. Slight chance of showers after midnight. Waves 2 to 4 ft subsiding to 1 to 3 ft after midnight.
.small craft advisory in effect from 4 pm cdt this afternoon through Wednesday evening...
Rest of today..East winds to 30 kt. Rain showers likely. Waves 2 to 4 ft building to 3 to 5 ft late.
Tonight..East winds to 30 kt becoming southeast in the evening then diminishing to 15 to 25 kt overnight. Showers likely and a slight chance of Thunderstorms in the evening, then showers with Thunderstorms likely after midnight. Waves 5 to 8 ft occasionally to 10 ft.
Wednesday..South winds 20 to 25 kt. Slight chance of showers in the morning. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft in the afternoon.
Wednesday night..Southwest winds 15 to 20 kt. Slight chance of showers after midnight. Waves 2 to 4 ft subsiding to 1 to 3 ft after midnight.
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 211811 afdlot area forecast discussion national weather service chicago romeoville, il 111 pm cdt Tue may 21 2019 Short term 359 am cdt through Wednesday... overnight an 11,000 ft cloud deck has been overperforming a bit in terms of rainfall production, though overperforming in this case means a couple hundredths of measurable rainfall at the surface. More widespread shower activity is expected to move into the area during the morning, followed by a break this afternoon and then a round of showers and thunderstorms tonight. Today's predawn activity was supported by moisture convergence focused around the 700mb level, which explains the high bases, along with some shortwave energy riding up the west side of an upper ridge positioned over the area. Stronger shortwaves appear poised to move across the area during the morning as the upper ridge axis drifts east, while moisture convergence also becomes more pronounced at lower levels. There appears to be a brief period this afternoon where the upper shortwave energy lifts north of the area and the low level moisture convergence becomes less focused. This would support a break in the rainfall activity until the next round arrives this evening. Showers and thunderstorms tonight will be rooted along a warm front and accompanied by increasing temperatures and dewpoints in a non- diurnal trend, especially after midnight. This warm front extends east from the low pressure center which is consolidating over the southern plains and lifting north over the next 2-3 days, reaching the lake superior area by Thursday morning. After the front lifts north tonight, height rises aloft and pressure rises at the surface will bring an end to the precipitation by mid to late morning Wednesday. Some of the storms tonight could produce locally heavy rain, but the system overall appears to be progressive enough to avoid widespread flooding issues. Lenning Long term 359 am cdt Wednesday night through Monday... as the occluding plains low continues its trek north, models show the trailing cold front getting somewhat sheared out and left behind, but eventually do have it drifting south through the area on Thursday, turning winds northwest and pushing the better boundary layer moisture farther south. For now, to mark the progress of the boundary, will plan to carry chance pops in the northwest early Thursday, across the south half of the forecast area during the morning, and across our southeast in the afternoon. The slightly drier air Thursday night will be short-lived, as the cold front stalls to our south and then gets pulled back north as a warm front ahead of the next low pressure system lifting through the plains on Friday. Shower and thunderstorm chances likely will be a bit higher on Friday, especially in the west and northwest part of the forecast area. Confidence of course begins to decrease heading into the holiday weekend, but models are in reasonable agreement in pushing the next stalling out cold front through the area early on Saturday as the plains low moves from minnesota across the northern great lakes and into eastern canada. This would be accompanied by yet higher shower and thunderstorm chances Friday night into Saturday. By late in the weekend and into early next week the continued evolution of this frontal boundary will help drive local |
thunderstorm chances, but confidence is too low to say with certainty which periods will be most favored. Early indications would have the activity focused across the southern portion of the forecast area with the boundary stalled to our south. Lenning Aviation For the 18z tafs... several concerns this period including... light rain with MVFR CIGS possible this afternoon. Strong gusty east winds this afternoon into tonight. Thunderstorms late this evening into early Wednesday morning. Gusty south winds Wednesday. In general, the initial forecast trends look good. The main adjustment has been to add the tempo MVFR cig vis with the ongoing warm advection wing of showers lifting north through NRN il in. Latest radar trends suggest that the main area of elevated warm advection forcing will lift north of the terminals within the next hour or 2. There may be a chance for a few isolated showers for the remainder of the afternoon and into early evening, but the stronger forcing will move north of the terminals. Guidance still suggests strong, gusty east winds through the afternoon and into early evening. May be a bit early introducing 30kt gusts at issuance time, but confidence is relatively high that stronger winds should mix down to the surface this afternoon. Have ended the initial gustiness by early evening as a strong inversion under the elevated warm advection sets up. This inversion should limit mixing, but with 45-50kt winds just above the inversion should set up a period with the potential for llws. A line of showers and thunderstorms is expected to move across the region late this evening and into the early morning hours. The high res models are in relatively good agreement on the timing and speed of the line of storms, so confidence is high enough to introduce the tempo group. Most of the TS should be along the leading edge of the pcpn shield, with some more isold TS in the trailing pcpn shield, but have tried to highlight the most likely timing in the tempo group, though the total residence time of ts at the terminals could be shorter than the tempo duration as the line is expected to move very quickly across the region. Following the passage of the line of tsra shra, winds should trend to southerly. The pressure gradient across the region will strengthen through the morning as low pressure deepens rapidly while lifting newd through the upper missouri valley. Southerly winds should strengthen through the morning, with gusts to 30 kt expected. The timing of the stronger gusts may be later than the 15z timing indicated in the 18z update, but have introduced the stronger gusts with the favored timing of gusts beginning though it is likely that the strongest gusts could be later in the morning or early afternoon. Lot watches warnings advisories Il... Beach hazards statement... Ilz006-ilz014... 4 pm Tuesday to 10 am Wednesday. In... Beach hazards statement... Inz001... 4 pm Tuesday to 4 am Wednesday. Lm... Small craft advisory... Lmz740-lmz741-lmz742-lmz743... 4 pm Tuesday to 7 pm Wednesday. Small craft advisory... Lmz744-lmz745... 4 pm Tuesday to 4 am Wednesday. 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 | 23 min | ENE 16 G 17 | 48°F | 44°F | |||
| CHII2 - Chicago, IL | 5 mi | 38 min | E 19 G 21 | 48°F | 47°F | |||
| JAKI2 | 5 mi | 128 min | E 13 G 19 | 49°F | ||||
| CMTI2 - 9087044 - Calumet, IL | 9 mi | 50 min | ENE 9.9 G 14 | 50°F | 1019.6 hPa | 48°F | ||
| FSTI2 | 9 mi | 128 min | E 23 | 47°F | ||||
| 45174 | 20 mi | 28 min | ENE 12 G 14 | 45°F | 2 ft | 1021.1 hPa | 45°F | |
| BHRI3 - Burns Harbor, IN | 28 mi | 60 min | E 6 G 9.9 | 51°F | 1020.7 hPa | |||
| 45170 | 34 mi | 28 min | E 14 G 18 | 51°F | 52°F | 2 ft | 43°F | |
| 45186 | 37 mi | 28 min | E 7.8 G 12 | 45°F | 47°F | 1 ft | ||
| MCYI3 - Michigan City, IN | 37 mi | 38 min | E 14 G 16 | 51°F | 42°F | |||
| WHRI2 - Waukegan Harbor, IL | 37 mi | 88 min | E 9.9 G 12 | 44°F | ||||
| 45187 | 45 mi | 28 min | E 7.8 G 12 | 44°F | 46°F | 1 ft |
Wind History for Calumet Harbor, IL
(wind in knots) EDIT (on/off) Help| 2 PM | 3 PM | 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 | |
| Last 24hr | N | N G11 | NE G11 | NE | N | N | N G9 | N | NW | N G8 | N | N | N G7 | NE G15 | NE | NE G11 | NE | E G14 | E G15 | E G16 | NE G12 | NE G14 | NE G13 | NE G14 |
| 1 day ago | SW G22 | SW G23 | SW G18 | SW G19 | SW G13 | W G17 | W G11 | SW G12 | W G17 | W G17 | SW G18 | SW G15 | W G15 | W G8 | W G11 | W G12 | W G11 | W G10 | W G14 | W G14 | NW G9 | N G13 | N G13 | N G11 |
| 2 days ago | N G8 | W G19 | -- | S | SE G14 | S G14 | N | NW | NW | NW | NW G9 | NW G9 | NW | NW | NE | S | S G16 | S G18 | S G18 | S G24 | S G18 | S G20 | S G19 | S G23 |
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 | 75 min | E 10 | 10.00 mi | Overcast | 50°F | 46°F | 86% | 1020.2 hPa |
| Chicago, Chicago-O'Hare International Airport, IL | 18 mi | 77 min | E 14 | 10.00 mi | Overcast | 48°F | 45°F | 89% | 1020 hPa |
| Gary Regional Airport, IN | 19 mi | 83 min | SE 9 | 10.00 mi | Overcast | 52°F | 46°F | 82% | 1020.3 hPa |
| Lansing Municipal Airport, IL | 22 mi | 73 min | E 7 | 10.00 mi | Overcast | 51°F | 46°F | 84% | 1020.3 hPa |
| Chicago / Wheeling, Pal-Waukee Airport, IL | 24 mi | 76 min | E 8 G 16 | 10.00 mi | Overcast | 49°F | 44°F | 83% | 1021 hPa |
Wind History from MDW (wind in knots)
| 3 PM | 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 | |
| Last 24hr | E | E | E | NE | NE | NE | NE | Calm | W | N | NE | E | NE | E | E | E | SE | SE | E G19 | E | E | E | E | E G22 |
| 1 day ago | W G37 | W G28 | W G25 | W G27 | W G24 | W G23 | W G26 | W G33 | W | W G23 | NW G22 | W | W G22 | W | W | NW G19 | NW G21 | NW | NW | N G18 | NW | N | N | N |
| 2 days ago | W G24 | SE | S G19 | S G22 | W | N | NE | E | NE | NE | NE | N | NE | E | S | S | S G20 | S | S G27 | SW G27 | S G25 | SW G25 | SW G27 | W G33 |
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.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Chicago, IL (15,3,4,5)
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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. |