Saturday, January25, 2020
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Marine Weather and Tides
Joliet, IL

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 7:09AMSunset 5:00PM Saturday January 25, 2020 7:23 AM CST (13:23 UTC) Moonrise 8:55AMMoonset 6:48PM Illumination 0% Phase: New Moon; Moon at 0 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:202001251615;;484795 Fzus53 Klot 250935 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 335 Am Cst Sat Jan 25 2020 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>742-251615- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 335 Am Cst Sat Jan 25 2020
Today..West winds 10 to 20 kt. Snow in the morning, then chance of snow and rain in the afternoon. Waves 1 ft or less.
Tonight..West winds 10 to 20 kt. Chance of drizzle, snow and slight chance of light freezing drizzle through the night. Waves 1 ft or less.
Sunday..West winds 10 to 15 kt. Cloudy. Waves 1 ft or less.
Sunday night..Northwest winds 5 to 10 kt. Mostly cloudy. Waves 1 ft or less.
LMZ742


7 Day Forecast for Marine Location Near Joliet, IL
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location: 41.52, -88.16     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 251154 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 554 AM CST Sat Jan 25 2020

SHORT TERM. 311 AM CST

Through Sunday .

The center of the upper low, that has been impacting the weather across the region for the past couple of days, is now east of KVPZ. Expect this storm system shift east-northward across southern Lower Michigan through the day and over New England by Sunday afternoon.

Bands of moderate to, at times, heavy snow have been ongoing across mainly western sections of the area around the I-39 corridor over the past several hours within a corridor of enhanced deformation centered near the track of the 700 mb low. This has effectively resulted in a narrow corridor of strong forced ascent through the dendritic growth zone, and within a region of steeper mid-level lapse rates. Rockford airport (KRFD) reported 1 inch per hour rates from about 10 pm through around 1 am within this band of heavier snow. This band of deformation is likely to shift eastward over parts of northeastern IL early this morning, so a period of moderate snow is likely to shift in over the Chicago metro area over the next couple of hours.

While snowfall rates will not be as impressive today, it still appears that accumulating snow will occur in a north-northwest to south-southeast corridor across northeastern IL and into northwestern IN today. Isentropic upglide on the western periphery of this large upper low is likely to continue for much of the day, so periods of snow will be a good bet across the Chicago metro area, and points to the south-southeast, especially through the morning hours and into the early afternoon. During this period the another 1 to 2 inches could occur. The snow should begin to gradually wind down later this afternoon and into the evening, with little to no additional accumulation thereafter.

We will have to monitor a small potential for drizzle or freezing drizzle later this evening. Model soundings indicate that drier air will shift in over the area aloft, while we maintain low cloud cover. This could result in the possibly of any lingering light precipitation falling as drizzle/freezing drizzle. I do not have a high amount of confidence that precipitation will still be occurring later this evening, so the potential for this freezing drizzle remains low, but I felt that a small chance mention in the forecast was warranted.

As for the ongoing winter weather advisory, I am not planning any changes to the end time due the possibly of freezing drizzle this evening. However, as previous discussions noted, it is possible that the advisory could be ended for the area later today, prior to its expiration tonight.

Quieter weather is expected over the area on Sunday. However, expect the low cloud cover to continue through the day. Highs should be in the low 30s.

KJB

LONG TERM. 221 AM CST

Sunday night through Friday .

Fairly benign pattern for the long term period. Weak long wave troughiness over the Great Lakes expected to persist much of the upcoming work week with mainly just some weak clipper-like systems potentially affecting the area with some light precip chances at times. Looks to be a fairly cloudy period with continued above average temps, largely due to above average nighttime lows. Will probably be a bit larger of a temp gradient across the CWA between the deeper snow pack left behind from this current system, but until we have a better idea where the snow pack will lay out, didn't make any adjustments to temps.

- Izzi

AVIATION. For the 12Z TAFs .

Light snow is expected to persist this morning and probably linger into the afternoon at the Chicago terminals. Best chance for IFR VSBY due to snow is this morning, but some potential for at least ocnl IFR in snow this afternoon. By later this afternoon will probably see a transition to possibly light snow/drizzle mix or just plain drizzle. Also possible that precipitation could just end later this afternoon with little or no drizzle. Temperatures will likely inch above freezing this morning and remain just a bit above freezing into this evening, so not anticipating much snow accumulation today. IFR CIGS expected to persist into this evening and possible through the overnight hours as well, though guidance does suggest a gradual improvement to MVFR by Sunday morning.

- Izzi

LOT WATCHES/WARNINGS/ADVISORIES. IL . Winter Weather Advisory . ILZ003-ILZ004-ILZ005-ILZ006-ILZ008- ILZ010-ILZ011-ILZ012-ILZ013-ILZ014-ILZ019-ILZ020-ILZ021- ILZ022 until midnight Sunday.

IN . None. LM . None.

Visit us at weather.gov/chicago

Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/NWSChicago www.twitter.com/NWSChicago www.youtube.com/NWSChicago


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CMTI2 - 9087044 - Calumet, IL 36 mi53 min SW 6 G 8.9 33°F 1008.3 hPa33°F
CNII2 37 mi23 min SW 5.1 G 8.9 34°F 32°F
CHII2 - Chicago, IL 41 mi33 min W 11 G 12 34°F 34°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Joliet Regional Airport, IL1 mi48 minW 52.00 miLight Snow34°F33°F97%1009.8 hPa
Lewis University Airport, IL7 mi48 minW 83.00 miLight Snow32°F32°F100%1009.5 hPa
Morris Muni-James R Washburn Field Airport, IL15 mi28 minW 103.00 miLight Snow33°F32°F99%1010.2 hPa
Aurora Municipal Airport, IL24 mi31 minW 92.50 miLight Snow Fog/Mist33°F30°F92%1009.9 hPa

Link to 5 minute data for KJOT

Wind History from JOT (wind in knots)
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Last 24hrCalmE4E4E4CalmCalmCalmCalmCalmCalmCalmCalmCalmSW4SW5SW4SW6CalmSW6SW4W5W4W5W4
1 day agoS5SE5S6S5S5S4S4S5SE4SE5SE3E3E4E6E3E5E5E4E5NE6E6E6E4E4
2 days agoS9S4S10
G14
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G14
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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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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Chicago, IL (8,2,3,4)
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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 numerous 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.