Sunday, December15, 2019
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Marine Weather and Tides
Justice, 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 7:09AMSunset 4:22PM Sunday December 15, 2019 5:03 PM CST (23:03 UTC) Moonrise 9:05PMMoonset 11:16AM Illumination 82% Phase: Waning Gibbous; Moon at 19 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
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LMZ742 Expires:201912160415;;838010 Fzus53 Klot 152042 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 242 Pm Cst Sun Dec 15 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>743-160415- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor-calumet Harbor To Gary- 242 Pm Cst Sun Dec 15 2019
Tonight..South winds around 5 kt becoming north late. Slight chance of snow through the night. Waves 1 ft or less.
Monday..North winds 10 to 15 kt. Mostly cloudy. Waves 1 ft or less building to 1 to 3 ft in the afternoon.
Monday night..North winds 10 to 15 kt becoming northwest after midnight. Slight chance of snow in the evening. Waves 1 to 3 ft building to 2 to 4 ft after midnight.
Tuesday..Northwest winds 10 to 15 kt becoming west 10 to 20 kt in the afternoon. Sunny. Waves 2 to 4 ft subsiding to 1 to 3 ft in the afternoon.
LMZ742


7 Day Forecast for Marine Location Near Justice, IL
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location: 41.75, -87.84     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 152112 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 312 PM CST Sun Dec 15 2019

SHORT TERM. 307 PM CST

Through Monday night .

An impressive east-west oriented snow band currently extends from northeast KS through central MO and into south central IL this afternoon. Light snow continues to spread northeastward across central IL which is expected to reach the area later this evening (7-10pm timeframe). The heavier snow bands are expected to remain south of our area.

This lead wave pushes through overnight, with sufficient isentropic lift overspreading the warm front for accumulating snow across the area. Currently expect mostly a light coating to half inch for areas north of I-80 and totals gradually increasing to 1-3 inches as you head south. Uncertainty remains concerning possible mesoscale banding resulting in locally higher snowfall totals up to an inch for some areas. The latest HRRR is hinting that a heavier band could set up just south of I-80, so it will be worth watching over the next few hours if amounts need to be adjusted a tad higher for some areas. Winds will thankfully be light, so visibility reductions would mainly be a concern under the heavier bands.

Expect this first wave to push out of the area by 6-7am with some lingering flurries possible into the morning hours. A brief lull is expected through the day on Monday before a secondary (and more southerly) wave grazes our southern counties that evening. There is a possibility that this stays south of our area, but a few more tenths of an inch of snow are possible across our far southeastern counties.

Petr

LONG TERM. 157 PM CST

Tuesday through Sunday .

Trough digging into the northeast U.S. at the start of the long range period will provide for a glancing blow of some cold air mid week. Medium range models are in good agreement in lifting the upper trough out late in the week with broad upper ridging/zonal flow developing over much of the country late in the week into the weekend. This should result in temps moderating to above average late in the week through the weekend and into early next week. Given the expected lack of snow cover and recent cool bias in the NBM, could see temps warmer than forecast over the weekend and into early next week. Pattern looks dry through period with little meaningful risk of any precipitation.

- Izzi

AVIATION. For the 18Z TAFs .

Main concern through this period is the potential for -SN tonight. MVFR ceilings from this morning have mostly dissipated, with a few MVFR clouds lingering this afternoon. Otherwise, VFR conditions are expected into early evening as light W winds become VRB between SW and SE.

A shield of -SN will approach the terminals from the south this evening. There remains some uncertainty as to how far north this shield of snow will reach. Have limited wordings of -SN at all sites except GYY by removing the prevailing -SN through much of the night. A period of some MVFR to briefly IFR visibility remains possible from roughly 04-09Z, but the likelihood remains too low to include as a prevailing group. If snow were too occur, some MVFR ceilings would be expected.

MVFR ceilings should then prevail through the remainder of the period, with a small chance for some lingering flurries into Monday morning. Winds on Monday will likely be VRB between 340-020, but remain under 10 knots.

Kluber

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CNII2 14 mi18 min S 5.1 G 5.1 26°F 16°F
CMTI2 - 9087044 - Calumet, IL 16 mi45 min S 5.1 G 6 26°F 1019.2 hPa17°F
CHII2 - Chicago, IL 18 mi33 min S 8 G 8.9 27°F 19°F
MCYI3 - Michigan City, IN 49 mi33 min S 6 G 7 26°F 17°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago Midway Airport, IL6 mi70 minS 410.00 miOvercast26°F15°F63%1021.1 hPa
Chicago, Chicago-O'Hare International Airport, IL16 mi72 minS 310.00 miOvercast26°F15°F63%1020 hPa
Lewis University Airport, IL17 mi68 minN 010.00 miFair24°F17°F77%1019.6 hPa
Lansing Municipal Airport, IL22 mi68 minN 010.00 miOvercast25°F17°F73%1020 hPa
Gary Regional Airport, IN24 mi78 minS 410.00 miOvercast27°F15°F64%1020 hPa
Joliet Regional Airport, IL24 mi68 minN 010.00 miPartly Cloudy25°F18°F74%1020 hPa

Link to 5 minute data for KMDW

Wind History from MDW (wind in knots)
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Last 24hrNW10W11NW12
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1 day agoSW6S4CalmS3CalmCalmCalmCalmCalmCalmW3CalmN5W3W6NW8NW8NW9W9W11W12W11NW11NW15
G22
2 days agoSW17
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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 (18,4,5,8)
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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.