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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 6:40AM | Sunset 4:30PM | Friday November 16, 2018 4:39 PM CST (22:39 UTC) | Moonrise 2:32PM | Moonset 12:31AM | Illumination 64% |  |
LMZ742 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 254 Pm Cst Fri Nov 16 2018
Tonight..West winds 10 to 20 kt early...diminishing to 5 to 10 kt overnight. Chance of snow through the night. Waves 1 to 3 ft subsiding to 1 ft or less in the late evening and overnight.
Saturday..North winds 15 to 20 kt. Snow in the morning, then chance of snow and rain in the afternoon. Waves 1 to 3 ft building to 3 to 5 ft in the afternoon.
Saturday night..North winds 15 to 20 kt. Slight chance of snow. Snow may be mixed with rain in the evening. Slight chance of snow through the night. Waves 3 to 5 ft.
Sunday..Northwest winds 10 to 15 kt becoming west in the afternoon. Mostly Sunny. Waves 2 to 4 ft subsiding to 1 to 3 ft in the afternoon.
Tonight..West winds 10 to 20 kt early...diminishing to 5 to 10 kt overnight. Chance of snow through the night. Waves 1 to 3 ft subsiding to 1 ft or less in the late evening and overnight.
Saturday..North winds 15 to 20 kt. Snow in the morning, then chance of snow and rain in the afternoon. Waves 1 to 3 ft building to 3 to 5 ft in the afternoon.
Saturday night..North winds 15 to 20 kt. Slight chance of snow. Snow may be mixed with rain in the evening. Slight chance of snow through the night. Waves 3 to 5 ft.
Sunday..Northwest winds 10 to 15 kt becoming west in the afternoon. Mostly Sunny. Waves 2 to 4 ft subsiding to 1 to 3 ft in the afternoon.
LMZ742 Expires:201811170500;;407351
FZUS53 KLOT 162054
NSHLOT
NEARSHORE MARINE FORECAST
National Weather Service Chicago/Romeoville IL
254 PM CST Fri Nov 16 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>742-170500-
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 162112 afdlot area forecast discussion national weather service chicago romeoville, il 312 pm cst Fri nov 16 2018 Short term 310 pm cst through Sunday... main concern is our next round of light snow accumulations tonight into Saturday, with some minor additional snowfall possible Saturday night for portions of east central illinois and northwest indiana. Will not be issuing any winter headlines for tonight- Saturday's minor event given expected amounts below typical criteria, mostly light snow rates, and Saturday morning timing. Regional radar early this afternoon mosaic indicates the advertised fairly narrow swath of snow from portions of the dakotas to southwest minnesota. This is being driven by an elongated but potent mid-level short-wave diving southeast across the aforementioned areas. In addition, a tight thermal gradient baroclinic zone was noted over the central and northern plains, with this contributing mesoscale frontogenetic enhancement to the snow. The overall trend in observations and in the guidance has been a slight southward shift in the snow swath, with ingredients looking to maximize from northeast ia into southwest wi. Initial narrow band or bands of warm advection light snow driven by a modest west-southwest ~20 kt 850 mb low level jet may try to push into portions of northern illinois mainly north of i-88 as early as the late evening hours. With this initial push encountering antecedent dry air aloft, it may end up being mostly virga, so kept pops low through around midnight. The initial waa wing will also start the top down saturation process, helping to get steadier precip going overnight. A roughly west-east and still fairly narrow axis of snow will set up mostly north of i-88 after midnight as mid-level short-wave draws closer and low-level convergence and f-gen increases. Forecast soundings indicate a relatively small dendritic growth (snow growth) zone, though with decent lift co-located within the dgz for a time. Therefore anticipate steady light to temporary moderate snow rates. While forcing ingredients will be fairly impressive for a time just to our northwest, there is good agreement in the model guidance that the mid-level short-wave driving large scale forcing to dampen weaken into Saturday morning. Thus, for this reason the snowfall intensity overall may trend downward Saturday morning over northern il into far northwest indiana. The main question is how long into Saturday morning does the support for transient stronger banding as the area of snow shifts more steadily southward with a southward moving cold front. Have gone with the idea of some maintenance of banding signatures despite evidence in some of the short range guidance of a quicker erosion of the precip shield. While there doesn't look to be instability above the lower-level frontogenesis, have to consider the possibility of f-gen banding remaining stronger longer than on a majority of the guidance (as shown on 12z wrf-arw and nmm). The narrow dgz, only short period of lift maximizing within dgz, and temps close to freezing during the event will keep ratios mostly below 10:1, perhaps highest far north and northwest. Amounts are favored to be up to around an inch roughly between i-80 and i-88, 1-2" north of i-88 and best chance for 2 to locally 3" amounts closer to the wisconsin border. There may be some minor travel impacts Saturday morning given mostly light snowfall rates. As the precip area likely further diminishes in intensity Saturday afternoon with southward progression, it will also encounter temps likely having warmed to above freezing, so any accums south will be likely a dusting to a few tenths at most on colder grassy surfaces. A marginal set-up for lake effect precipitation will then evolve with northerly flow over the lake, caa, and with time lower-level convergence late day into Saturday night. Given low inversion heights below 6kft, suspect lake effect precip will be spotty, so kept pops in only slight to low chance range for this |
for now, but will need to monitor trends. Finally, elevated frontal zone will remain stalled near or south of southern cwa Saturday night into Sunday morning with subtle low amplitude wave(s) interacting with it. This could bring some additional light snow accums to areas south of the kankakee river, with low magnitude of forcing likely keeping any accums under 1". Sunday will feature decreasing clouds and light winds but continued unseasonably chilly highs in the lower to mid 30s after starting in the 20s. Castro Long term 310 pm cst Sunday night through Friday... Sunday night through Tuesday night: broad troughing over hudson bay will begin to slowly shift east during this time, with deep cyclonic flow remaining over the western great lakes. However, conditions should remain dry across the area. The one exception will be the potential for a brief shot of les for mainly northern porter county sometime Monday night into Tuesday behind a mid-level trough. H8 temps are only marginally supportive of les, so would not expect any significant impacts. Wednesday through Friday: guidance begins to differ in the eastward progression of the broad trough over eastern canada by this time. However, the general evolution will be toward mid-level ridging and southerly surface winds over the central CONUS by Friday, promoting temps closer to normal for late november. Kluber Aviation For the 18z tafs... aviation concerns include moderately gusty west-northwest winds and MVFR ceilings this afternoon, then the potential ifr conditions in light snow late tonight through Saturday morning. Low pressure continues to pull slowly away from the great lakes region this mid-day, with breezy west-northwest surface winds gusting around 20 kts across the area at times. Extensive MVFR stratus was evident in satellite imagery, extending upstream across wi ia mn. Models indicate erosion of the MVFR deck from the west during the late afternoon hours, though expect this may be a bit too quick. Should see a gradual lifting of cloud bases during the afternoon though, along with a gradual weakening of the gradient and loss of gusts by sunset. Attention then turns to a quick-moving clipper-type disturbance currently moving out of the northern rockies. Light snow is expected to develop across far northern il around after midnight, though may struggle initially as drier low levels take time to saturate. The greatest potential for more intense snow appears to be early Saturday morning, with a period of ifr conditions and accumulation expected. Mid-level drying will develop mid-day Saturday, which should allow for a quick diminishing of the snow. A few flurries... Or perhaps some drizzle or sprinkles... May continue into the afternoon hours. Winds will become light and variable overnight tonight, eventually becoming north-northeast Saturday morning. Ratzer Lot watches warnings advisories Il... None. In... None. Lm... Small craft advisory... In nearshore waters until 9 pm Friday. Small craft advisory... Il nearshore waters until 3 pm Friday. 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 | 24 min | WSW 8.9 G 13 | 39°F | 31°F | |||
| CHII2 - Chicago, IL | 5 mi | 39 min | W 19 G 20 | 40°F | 32°F | |||
| JAKI2 | 5 mi | 99 min | WNW 8 G 14 | 40°F | ||||
| FSTI2 | 9 mi | 99 min | W 22 | 39°F | ||||
| CMTI2 - 9087044 - Calumet, IL | 9 mi | 39 min | WSW 7 G 13 | 39°F | 1016.4 hPa (+1.6) | 32°F | ||
| BHRI3 - Burns Harbor, IN | 28 mi | 39 min | WNW 8.9 G 12 | 41°F | 1017.3 hPa (+2.1) | |||
| 45186 | 37 mi | 39 min | WNW 12 | 39°F | 43°F | 1 ft | ||
| WHRI2 - Waukegan Harbor, IL | 37 mi | 59 min | W 9.9 G 15 | 38°F | ||||
| 45187 | 45 mi | 39 min | 40°F | 44°F | 1 ft |
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 | SW G8 | SW | SW G10 | S G11 | SW G11 | SW G14 | SW G17 | SW G13 | S G13 | S G15 | S G14 | SW G15 | SW G14 | SW G12 | SW G12 | SW G10 | W G11 | W G10 | W G19 | W G20 | W G14 | W G12 | W G11 | W G9 |
| 1 day ago | N G7 | NE | NE G9 | E G10 | E G13 | SE G14 | E G12 | E G12 | E G13 | E | E G14 | E G14 | E | E | E | E | NE G11 | E | E G12 | SE | S | S | S | SW G8 |
| 2 days ago | W G9 | W G9 | W G7 | W | W G6 | SW | SW | SW | SW | SW | W | NW G10 | W | W G8 | W | W | SW G7 | W G7 | SW G6 | N G6 | N | NE G7 | E G6 | N |
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 | 46 min | W 10 | 10.00 mi | Overcast | 39°F | 30°F | 70% | 1017.9 hPa |
| Chicago, Chicago-O'Hare International Airport, IL | 18 mi | 48 min | W 10 | 10.00 mi | Overcast | 38°F | 30°F | 76% | 1017.1 hPa |
| Gary Regional Airport, IN | 19 mi | 54 min | W 10 | 10.00 mi | Overcast | 41°F | 32°F | 70% | 1017.3 hPa |
| Lansing Municipal Airport, IL | 22 mi | 44 min | W 9 | 10.00 mi | Overcast | 38°F | 30°F | 74% | 1016.9 hPa |
| Chicago / Wheeling, Pal-Waukee Airport, IL | 24 mi | 47 min | W 9 | 10.00 mi | Overcast | 39°F | 28°F | 67% | 1017.4 hPa |
Wind History from MDW (wind in knots)
| 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 | 11 PM | -12 PM | |
| Last 24hr | ||||||||||||||||||||||||
| 1 day ago | ||||||||||||||||||||||||
| 2 days ago |
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
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Chicago, IL (17,4,5,8)
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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. |