Thursday, December12, 2019
Privacy Policy
L-36.com


Marine Weather and Tides
Evanston, IL

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:07AMSunset 4:20PM Thursday December 12, 2019 1:54 PM CST (19:54 UTC) Moonrise 5:57PMMoonset 8:27AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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
    EDIT      (on/off)   Help
LMZ741 Expires:201912122230;;242601 Fzus53 Klot 121517 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 917 Am Cst Thu Dec 12 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>742-122230- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 917 Am Cst Thu Dec 12 2019
.small craft advisory in effect until 9 pm cst this evening...
Rest of today..South winds to 30 kt. Mostly cloudy. Waves 4 to 7 ft occasionally to 9 ft.
Tonight..Southwest winds to 30 kt diminishing to 15 to 20 kt after midnight. Cloudy. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft after midnight.
Friday..Southwest winds 10 to 15 kt. Cloudy. Waves 1 to 3 ft subsiding to 1 ft or less in the afternoon.
Friday night..Southwest winds 10 to 15 kt becoming west 5 to 10 kt after midnight. Slight chance of rain in the evening, then slight chance of drizzle and snow after midnight. Waves 1 ft or less.
LMZ741


7 Day Forecast for Marine Location Near Evanston, IL
   Hourly   EDIT   Help
location: 42.03, -87.69     debug


Area Discussion for - Chicago, IL
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS63 KLOT 121814 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 1214 PM CST Thu Dec 12 2019

SHORT TERM. 300 AM CST

Through Friday .

Today will find temperatures jump 15 to 20 degrees from yesterday thanks to gusty southerly winds expected to sporadically peak near 35 mph. Apart from a chance of sprinkles/spotty light rain in the far north, through the day Friday looks dry for most if not all of northern Illinois and northwest Indiana.

Early morning satellite water vapor imagery reveals a mid-level circulation across the Dakotas headed quickly east-southeast. This will pivot more due east in southern Minnesota into Wisconsin as it rounds the larger scale long wave trough across the eastern half of Canada. With this feature impinging quickly on the modified arctic air mass, this has limited time for any moistening in its warm sector, and that's why any afternoon/early evening brief light rain or sprinkles should be confined to near the Wisconsin state line associated with a 60+ kt low-level jet. It's this return flow that will be the story for the area, with sustained southerly winds near 20 mph thanks to a large surface isallobaric component. Given the unlikely scenario of any lower base clouds, would expect the boundary layer while shallow to still be able to mix gusts occasionally to the top of the mixing channel of 35 mph shown by the RAP and GFS.

By advection alone, temperatures will climb into the 40s with high confidence for most of the CWA, apart from toward Rockford where readings may stay just shy of that due to the thickest mid-level clouds. The question is just how far into the 40s. Some limited snow cover in the Illinois and Vermilion River Valleys should sublimate fairly quickly today and there is some guidance indication that the southeast CWA sees some thinning of high-mid cloud cover offering some sun. For now have gone primarily mid 40s, trying to balance the fact that the day after a heart of an arctic mass often can run a little cooler than guidance, though those often have widespread snow cover.

The clipper's associated low-level trough/cold front will move into the CWA late tonight and gradually weaken through Friday. Clouds should start to thicken and gradually lower Friday in a slowly moistening mid to low levels, but forcing for precipitation looks limited. In the absence of any advection and with clouds, high temperatures look to peak upper 30s to 40.

MTF

LONG TERM. 325 AM CST

Friday night through Wednesday .

An unsettled pattern will be in place Friday night through Monday, with Monday having some signal for accumulating snow maybe more so along/south of I-80, but that is with low confidence. For the beginning of this time (Fri night into Sat), the precipitation intensity looks light and coverage potentially limited, so impacts look to be small. The one main caveat to that is that there is a limited chance of freezing drizzle later Friday night and early Saturday morning.

A pseudo-split flow regime Friday night into Saturday will see multiple slow-moving short waves in the region, with guidance favoring the southern stream jet to drive some phasing of this activity east of the region into Saturday night. This presents limited deeper upper jet support in the region, as well as minimized areas of focus/convergence/baroclinicity in the lower to mid levels. On Friday night, any precipitation looks light and associated with either very weak isentropic upglide or pockets of ascent ahead of/within any of the mid-level impulses. Profiles show some marginal saturation of the heterogeneous ice nucleation layer, but also have doubts there will be precipitation actually occurring in such a profile. So while drizzle/freezing drizzle is possible it is again low confidence. Equally if not slightly more likely if any precipitation occurs is that it may be patchy very light snow/flurries. Lows on Friday night/Saturday morning have consistently looked like they would be right around freezing.

With the strengthening low expected to the east into Saturday p.m., cold advection will gradually strengthen over the area with still some impulses rotating through. So some potential for light snow Saturday and depending on how temperatures fall out, could see some very light accumulation. Anything higher than that is a diminishing forecast outcome at this point. The shot of cold advection will bring wind chills into the single digits during Saturday evening persisting into Sunday morning.

A continued quasi-split flow pattern rides into the start of next week. Guidance is in sound agreement on a southern stream system anchored along the subtropical jet and amplifying somewhere in the eastern half of the country on Monday. The ECMWF has been consistently south with this while the GFS has been frequently further north over a larger part of the CWA on its solutions. The GFS ensemble does have some more members that have trended north this past 24 hours, and a majority of them are producing some snow in the southeast forecast area as the system matures. For now have only inched up blend-provided chances in the southeast CWA, but tough to stray much from the consistent ECMWF solution at this medium range distance. Will be a period to watch as a swath of accumulating snow is certainly possible somewhere in the Ohio Valley to southern Great Lakes region.

Beyond looks somewhat quiet as northwest flow aloft takes back over for at least a multi-day period. Temperatures should be slightly below normal, though if any snow cover materializes that would likely tilt the forecast colder.

MTF

AVIATION. For the 18Z TAFs .

Low pressure across northern IA will shift into Wisconsin this afternoon and will continue the gusty south winds across the terminals. A strong inversion will limit the strength of gusts at the surface but lower 30 kt gusts have been observed and should remain the case this afternoon. Cannot rule out stray gust to 35 kt which would impinge on the ORD cross runway threshold, otherwise expect LLWS through the afternoon with 50-55 kt at 2000 ft. Speeds will taper off this evening as will the magnitude of the LLWS.

Lower VFR or some MVFR ceilings may impinge on the area this evening and overnight, with a bit higher confidence toward RFD and to the the west of ORD/MDW Friday morning.

KMD

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . Small Craft Advisory . IN nearshore waters until midnight Friday.

Small Craft Advisory . IL nearshore waters until 9 PM Thursday.



VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK . TWITTER . AND YOUTUBE AT: WWW.FACEBOOK.COM/NWSCHICAGO WWW.TWITTER.COM/NWSCHICAGO WWW.YOUTUBE.COM/NWSCHICAGO


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHII2 - Chicago, IL 10 mi35 min SSW 29 G 32 43°F 28°F
CNII2 13 mi25 min S 17 G 24 43°F 25°F
CMTI2 - 9087044 - Calumet, IL 22 mi55 min S 13 G 23 42°F 1020.4 hPa (-4.4)28°F
KNSW3 - Kenosha, WI 39 mi55 min SSW 15 G 20 43°F 1018.6 hPa (-4.4)
MCYI3 - Michigan City, IN 46 mi35 min S 20 G 26 41°F 26°F

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
W5
G8
NW4
SW3
SW4
SW3
SW2
SE2
S2
SE2
SE5
SE6
G10
SE6
G10
SE8
G13
SE7
G12
SE9
G13
SE8
G11
SE9
G12
S11
G15
S12
G18
S14
G22
S12
G19
S15
G20
S17
G23
S13
G23
1 day
ago
SW9
G14
SW10
G14
SW6
G13
SW6
G12
SW9
G16
SW5
G12
SW5
G10
SW5
G13
SW7
G12
SW5
G11
SW5
G9
SW7
G12
W8
G13
SW7
G12
SW10
G14
SW8
G11
SW7
G11
SW8
G12
SW7
G10
W7
G12
W6
G11
SW5
G10
SW6
G10
SW5
G11
2 days
ago
SW10
G16
SW8
G12
SW8
G14
SW11
G19
SW10
G24
SW12
G19
W9
G24
SW9
G16
W8
G14
W8
G15
W10
G17
W10
G16
W7
G14
SW12
G17
SW10
G16
SW10
G16
W7
G16
SW8
G13
SW9
G14
SW8
G14
W6
G12
W7
G15
W8
G16
W9
G14

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL12 mi63 minS 20 G 3110.00 miOvercast and Breezy44°F24°F45%1020.7 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi64 minSSW 13 G 2710.00 miOvercast42°F26°F53%1020.5 hPa
Chicago, Chicago Midway Airport, IL17 mi62 minSSW 14 G 2710.00 miOvercast43°F27°F53%1021.9 hPa

Link to 5 minute data for KPWK

Wind History from PWK (wind in knots)
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 24hr6W5W4CalmCalmCalmCalmCalmCalmCalmCalmSE3S4SE4SE5SE6SE7S10S10S14
G19
S16S15
G22
S17
G27
S20
G31
1 day agoW10
G19
W11
G17
W7W9
G17
W6SW6W9W8
G17
W8W10W8
G17
W11
G18
W11
G19
W10
G17
W8W7SW7W7W8W6W12
G19
W12W10W8
G16
2 days agoSW8W8
G20
W8
G16
W18
G30
W17
G28
W18
G32
W14
G27
W12
G21
W14
G22
W10
G20
W10W10
G23
W11
G21
W16
G24
W13
G19
W14
G21
W9
G18
W12W11W9W11
G17
W11
G19
W10
G17
W11
G18

Tide / Current Tables for
   EDIT   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS Local Image of Midwest    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 (14,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Chicago, IL
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Cookie Policy:
This webiste uses cookies to save your settings. No personal information is saved. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. I do not keep site logs longer than I need to to keep bad actors off the site. Basically, I delete them after looking at them. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
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.