Tuesday, December10, 2019
Privacy Policy
L-36.com


Marine Weather and Tides
Niles, 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 7:06AMSunset 4:21PM Tuesday December 10, 2019 4:57 AM CST (10:57 UTC) Moonrise 4:32PMMoonset 6:17AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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:201912101645;;130898 Fzus53 Klot 100905 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 305 Am Cst Tue Dec 10 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>743-101645- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor-calumet Harbor To Gary- 305 Am Cst Tue Dec 10 2019
.small craft advisory in effect until 9 am cst this morning...
Today..West winds 20 to 25 kt easing to 15 to 20 kt by early afternoon. Mostly cloudy with a chance of flurries early this morning then clearing. Waves 3 to 5 ft subsiding to 2 to 4 ft by late morning.
Tonight..West winds 10 to 20 kt. Mostly clear. Waves 1 to 3 ft.
Wednesday..West winds 15 to 20 kt becoming northwest and diminishing to 10 kt late in the afternoon. Slight chance of snow in the morning. Waves 1 to 3 ft.
Wednesday night..West winds around 5 kt becoming southeast 10 to 15 kt after midnight. Mostly clear in the evening then becoming mostly cloudy. Waves 1 ft or less.
LMZ741


7 Day Forecast for Marine Location Near Niles, IL
   Hourly   EDIT   Help
location: 42, -87.81     debug


Area Discussion for - Chicago, IL
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS63 KLOT 100933 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 333 AM CST Tue Dec 10 2019

SHORT TERM. 138 AM CST

Through Tonight .

The cold air has taken up residence for the short term with teens areawide and wind chills of 5 below to 5 above to start today. This cold, near 15 degrees below normal for early December, is the main story today.

Early morning water vapor imagery depicts the source of the cold air in the upper levels -- a well-defined long wave trough -- carving into the Great Lakes region. A 165 kt upper jet is square atop the area as of 130 am and leading this trough in. Underneath, cold advection profiles continue with stratocumulus that has been slow to progress eastward, and some of this has brought flurries. Local aircraft soundings indicate the depth of these clouds are about 2,000 ft and locked between the subsidence inversion aloft and the boundary layer. The cold advection profiles at 925-850 mb will weaken from daybreak through mid- morning, and expect the clouds to show considerable scattering from west to east during that time.

Temperatures should continue to drop through 9 a.m. or so with westerly winds gusting at times to 20 mph. Readings will only rebound slightly with lower to mid 20s for highs from north to south with high confidence.

There should be a period of sun after early morning clouds depart that persists through most of the afternoon. There is, however, a large area of clouds to the west with a leading edge in central Iowa early this morning, and this is tied to a sheared wave rounding the trough into southern Wisconsin this afternoon. The RAP does bring some of this 5-8,000 ft moisture over north central Illinois this afternoon, but if will be fighting suppression and drier air in advance. If conditions were to cloud back up in north central Illinois this afternoon, there could be flurries.

Depending on the duration of clearing tonight, lows will have potential to reach single digits for outlying areas north of I-80, but most favored north of I-88. Clouds should start to thicken late in advance of a quick-moving system noted below.

MTF

LONG TERM. 330 AM CST

Wednesday through Monday .

There are a couple periods of interest for precipitation potential, first off with light snow chances for some on Wednesday morning. Then over the weekend, a more noteworthy system could bring rain/snow and accumulating snow somewhere in the region. Early next work week offers some chance for wintry precip as well, though confidence is very low in that portion of the forecast.

Wednesday morning's potential brief light snow producer is a subtle mid-level short-wave that will relatively maximize in intensity with a modest warm advection response from central and eastern Iowa to near the MS River. The wave will then likely get sheared/weaken with eastward extent. Also adding large scale lift will be a strong 125+ kt 300 mb jet streak nosing in. Uncertainty is rather high even this close in due to the subtle/low-amplitude nature of the short-wave, as well as the very dry low level Arctic air mass that it will be encountering. On the other hand, with such a cold air mass in place, it doesn't take much saturation to wring out dendrites. The model guidance is unsurprisingly pretty variable with the placement of light QPF, with a sizable spread in the CAMs as well. Overall, the last few runs of the 3km NAMNest are most bullish and farther north in holding the wave together a bit farther east.

Despite the mixed signals in the guidance, the slightly better chances for a period of morning light snow look to line up for roughly the southwest 1/3 of the CWA. In collaboration with WFO DVN and ILX, bumped up PoPs to the chance range along/south of a Sterling to Kankakee to Iroquois line, with slight chances up to near or just north of I-90 corridor. As would be expected, the DGZ will be quite deep in the Arctic air mass, so areas that do get into light snow could get a quick couple tenths of accumulation. With cold temps in the teens, even a coating of snow could cause some travel impacts during the morning commute.

The rest of Wednesday will clear out as strong 1035 mb high pressure quickly overspreads from the northwest. After highs in the 20s, light to calm winds and clear skies for a few to several hours after sunset should support a quick temperature fall to the teens in many areas, with low teens in favored northern IL cold spots. Can't rule out some isolated upper single digits evening lows if skies stay clear long enough. Warm advection will then quickly ensue with increasing clouds and gradually increasing east to southeast winds overnight, so temps will level out and then rise into Thursday morning. Thursday will be a breezy and much milder day on the back side of the high pressure as a weak surface low lifts to our northwest. Current signs suggest that cloud cover will be mid and high level, so southerly winds gusting to 25 to perhaps 30 mph, mild 925 mb temps and no snow cover should translate into highs into the low and even mid 40s. Rain is likely to stay north of the Wisconsin state line.

The close of the work week into the first half of the weekend offers a challenging, complex surface and mid-upper level pattern. A split flow pattern and active Pacific jet will likely have a few stronger embedded short-waves passing nearby, with questions on any possible phasing with an incoming northern stream trough digging southward. The daytime hours Friday should be mostly quiet, but cloudy with a better chance for return southerly flow stratus, so low 40s highs might be generous.

A weak surface low will be taking shape over the mid Missouri valley by Friday evening, with potential for light warm advection precip ahead of it (possibly a rain/snow mix). The exact track of the surface low, as well as evolution of mid-upper level features is certainly far enough out for changes. However, broad agreement in general idea of surface low tracking over and then east of the area on Saturday supports mid range chance PoPs. Saturday is a period to watch, as we could see a scenario of rain to snow or even all snow for parts of the area depending on overall evolution.

The 00z ECMWF and ensemble suite was most concerning on this note, though even operational GFS and GEM not too far off. We'll be monitoring for potential accumulating snow and travel impacts in at least portions of the region, which may be coupled with steadily falling temps through the evening after earlier temps above freezing. Sunday and especially Monday are lower confidence, with models waffling on whether next possible system impacts our region or aims farther east. The cold shot behind Saturday's system could also be more robust than indicated in official forecast, especially if snow cover is laid down in portions of the area.

Castro

AVIATION. For the 06Z TAFs .

MVFR CIGS have been slow clear thus far tonight and satellite trends would support pushing the forecast clearing time later than in previous TAFs. As colder air spills in, could see a few flurries overnight, but unlikely to reduce VSBY or accumulate, so left flurries out. Otherwise, will likely maintain gustiness through the night, with gust frequency quickly fading toward sunrise. Cannot rule out a sporadic gust or two during the day Tuesday, especially in the morning, but unlikely to see prevailing gustiness during the day.

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . Small Craft Advisory . Gary to Michigan City IN until 3 PM Tuesday.

Small Craft Advisory . Winthrop Harbor to Gary IN until 9 AM Tuesday.



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 14 mi58 min W 21 G 23 22°F 18°F
CNII2 15 mi43 min W 12 G 17 22°F 16°F
CMTI2 - 9087044 - Calumet, IL 24 mi58 min WSW 9.9 G 16 21°F 1013.7 hPa (+2.8)15°F
KNSW3 - Kenosha, WI 41 mi58 min WNW 17 G 21 23°F 1012.5 hPa (+2.0)

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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
AM
1
AM
2
AM
3
AM
4
AM
Last
24hr
S8
G11
SW6
G12
SW6
G10
SW7
G12
SW7
G12
SW6
G9
S8
G11
SW5
G10
SW8
G11
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
1 day
ago
S10
G13
S10
G14
S14
G19
S11
G17
S10
G17
S12
G21
S12
G16
S10
G16
S11
G17
S8
G13
S7
G11
S6
G11
S6
G9
S5
G9
S6
S4
G7
S5
S7
G11
S6
S4
G8
S7
G11
S7
G10
S7
S7
G13
2 days
ago
SE1
S3
S6
S5
G9
S5
G11
S9
G12
S7
G10
S9
G13
S9
G13
S8
G12
S8
G11
S8
G12
S6
G10
S5
S6
S8
G14
S10
G16
S12
G15
S11
G16
S10
G14
S13
G22
S8
G14
S13
G17
S11
G17

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago-O'Hare International Airport, IL5 mi67 minW 12 G 229.00 miLight Snow20°F12°F74%1014.3 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL9 mi66 minW 13 G 1910.00 miOvercast22°F12°F68%1014.7 hPa
Chicago, Chicago Midway Airport, IL15 mi65 minW 155.00 miLight Snow Fog/Mist21°F14°F74%1015.4 hPa
Chicago / West Chicago, Dupage Airport, IL24 mi66 minW 1610.00 miOvercast18°F12°F77%1015.1 hPa

Link to 5 minute data for KORD

Wind History from ORD (wind in knots)
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
AM
1
AM
2
AM
3
AM
4
AM
5
AM
Last 24hrSW7SW7SW8SW11SW9SW8SW8SW10SW13
G19
W16
G23
W11W21
G30
W17
G32
W20
G31
W19
G30
W19
G29
W15
G23
W11
G21
W13
G22
W12W14
G21
W11
G22
W12
G22
W11
G19
1 day agoS9S11
G17
S11
G20
S15
G20
S14
G22
S12
G21
S12
G23
SW12
G21
SW10
G19
SW11SW6SW6S4S3S3SE4S4S4S5S6S6S7S3SW7
2 days agoS5S7S6S8S9S10S10S8S9S8S7S8S7S9S9S10S9S9
G17
S11
G19
S12S11S11
G19
S10S12
G21

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    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 (5,6,7,8)
      (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.