Wednesday, May23, 2018 L-36.com


Marine Weather and Tides
Niles, IL

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:21AMSunset 8:14PM Wednesday May 23, 2018 5:57 AM CDT (10:57 UTC) Moonrise 2:07PMMoonset 2:33AM Illumination 61% Phase: Waxing Gibbous; Moon at 8 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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LMZ741 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 300 Am Cdt Wed May 23 2018
.dense fog advisory in effect until 10 am cdt this morning...
Today..Variable winds 5 to 10 kt becoming east in the afternoon. Areas of dense fog this morning. Patchy fog this afternoon. Waves 1 ft or less.
Tonight..Southeast winds around 5 kt. Patchy fog. Waves 1 ft or less.
Thursday..Southeast winds 5 to 10 kt. Sunny. Waves 1 ft or less.
Thursday night..Southeast winds 5 to 10 kt becoming south after midnight. Mostly clear. Waves 1 ft or less.
LMZ741 Expires:201805231530;;393237 FZUS53 KLOT 230800 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 300 AM CDT Wed May 23 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>742-231530-

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


Area Discussion for - Chicago, IL
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Fxus63 klot 230801
afdlot
area forecast discussion
national weather service chicago romeoville, il
301 am cdt Wed may 23 2018

Short term
234 am cdt
through tonight...

main forecast concerns challenges are with fog trends this
morning across much of the area, with an area of dense fog
situated across far northwest indiana.

High pressure overhead early this morning supporting another
night morning of fog development across the cwa. An area of dense
fog has developed across the northern portions of lake and porter
counties in in, and at this time, it has remained fairly
stationary. Given how dense this fog was and that it wasn't likely
going to dissipate, went ahead and issued a dense fog advisory.

Guidance does continue to indicate this fog will expand into
remaining areas of northwest in while other areas of dense fog
develop across portions of northern il. Have already seen fog
development this morning, with any other areas of dense fog
remaining isolated. Overall pattern along with low dewpoint
depressions would support continued fog development, some of which
could be dense this morning. Have continued the forecast of
areas widespread fog over much of northern il and northwest in
through this morning, and will continue to monitor for more
widespread dense fog and the possibility of including other areas
in the advisory. The fog any low clouds should scatter out through
mid morning, with partly cloudy to sunny skies expected today.

Warmer temps around 80 expected today, while locations near the
lake observe onshore flow and cooler temps in the 60s.

Rodriguez

Long term
234 am cdt
Thursday through Tuesday...

overall trend into the end of the work week will be upper level
ridging with a continued warming trend. Any guidance that
indicated the possibility for some weak mid level energy to ride
along this ridge into Thursday morning is now consistent with
keeping this energy and any precip chances to the north northwest
of the area. Dry conditions for the entire area expected through
early Friday. By late Friday into the start of the weekend, the
ridge breaks down as upstream energy dips down across the region.

This will coincide with increasing moisture, and while instability
shifts overhead. While higher focus for thunderstorm development
should stay to the north, guidance indicating the possibility for
sagging development into at least the northern half of the cwa
late Friday Friday night. Although confidence is not overly high,
its enough to keep slight chance to low chance mention of thunder
Friday night.

Pattern going into the weekend will support a continued warming
trend with temps well above normal. Temp forecasts in the upper
80s still seem reasonable including near the lake, with some
locations possibly climbing more to around 90 this weekend. Have
not trended this way quite yet given the continued possibility for
periodic and scattered shower and thunderstorm development that
could limit some heating. Given the summer like pattern, this
thunderstorm development still seems reasonable at this time.

Rodriguez

Aviation
For the 06z tafs...

high pressure has moved over northern illinois and northwest
indiana and will provide light winds through most of the forecast
period. Mostly clear skies will continue overnight with only some
passing high cirrus. Patchy fog has already developed and should
continue to expand overnight. Some locations may experience dense
fog with visibility a quarter mile or less. Fog should clear
around mid morning Wednesday withVFR conditions the remainder of
the day. Light east to southeast winds are expected to develop
later in the day Wednesday behind the ridge axis. There is an
additional, albeit low, chance for fog Wednesday night into
Thursday morning.

Bmd

Marine
300 am cdt
high pressure over lake michigan early this morning will provide
light winds across the lake today and tomorrow in addition to
foggy conditions. Dense fog will continue over portions of the
lake through at least mid morning today. Beyond that confidence
decreases in how much improvement there will be, if any, but
suspect there will at least be patchy fog in place through the day
and tonight. It's possible the dense fog advisory may need to be
extended or a new one issued for tonight. Low pressure will move
into manitoba late Thursday and slowly dig into the upper midwest
Friday and Saturday. Southwest flow will increase in response,
peaking at 15 to 25 kt over northern lake michigan. Winds drop off
again over the weekend as the low slowly moves east across the
western great lakes.

Bmd

Lot watches warnings advisories
Il... None.

In... Dense fog advisory... Inz001-inz002 until 9 am Wednesday.

Lm... Dense fog advisory... Lmz740-lmz741-lmz742-lmz743-lmz744-lmz745-
lmz777-lmz779 until 10 am Wednesday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FSTI2 9 mi117 min S 6 52°F
OKSI2 12 mi117 min Calm G 0 54°F
45174 12 mi27 min S 3.9 G 3.9 49°F 48°F49°F
CHII2 - Chicago, IL 14 mi37 min SSW 5.1 G 5.1 54°F 53°F
CNII2 15 mi27 min Calm G 4.1 52°F 49°F
JAKI2 20 mi117 min Calm G 0 53°F
CMTI2 - 9087044 - Calumet, IL 24 mi39 min SSW 1 G 1 51°F 1020.6 hPa51°F
WHRI2 - Waukegan Harbor, IL 25 mi77 min WSW 1.9 G 1.9 52°F
KNSW3 - Kenosha, WI 41 mi57 min 53°F 1020.7 hPa (+1.4)
BHRI3 - Burns Harbor, IN 43 mi55 min Calm G 0 52°F 1021.3 hPa
45170 48 mi27 min Calm G 1.9 49°F 55°F49°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago-O'Hare International Airport, IL5 mi66 minN 06.00 miFog/Mist52°F50°F93%1020.4 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL9 mi65 minN 08.00 miFair52°F51°F97%1021 hPa
Chicago, Chicago Midway Airport, IL15 mi64 minN 04.00 miFog/Mist53°F50°F89%1020.5 hPa
Chicago / West Chicago, Dupage Airport, IL24 mi65 minN 01.50 miFog/Mist51°F51°F100%1020.7 hPa

Wind History from ORD (wind in knots)
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Last 24hrCalmN4N6NW44W3NE9NE7NE4E6E4E5E4E6E4E4CalmCalmS3CalmCalmCalmCalmCalm
1 day agoSW9
G15
E3NE10E11N5N5E5E4CalmE4NE4N4CalmN5N7N5N3N6N4CalmN3N4N5N3
2 days agoN16NE17NE14NE15N12NE10N12N12NE12NE11N13NE12NE11NE6N5N7N7NE7NE6NE7N8NE7NE8NE8

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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GOES 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 (6,6,7,8)
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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.