Tuesday, May22, 2018 L-36.com


Marine Weather and Tides
North Chicago, 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 8:15PM Tuesday May 22, 2018 2:26 PM CDT (19:26 UTC) Moonrise 12:59PMMoonset 2:00AM Illumination 54% Phase: First Quarter Moon; 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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LMZ740 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 850 Am Cdt Tue May 22 2018
.dense fog advisory in effect until 4 pm cdt this afternoon...
Rest of today..North winds 5 to 10 kt becoming northeast in the afternoon. Areas of dense fog. Waves 2 ft or less.
Tonight..Northeast winds 5 to 10 kt becoming north after midnight. Patchy fog. Waves 1 ft or less.
Wednesday..East winds 5 to 10 kt. Mostly Sunny. Waves 1 ft or less.
Wednesday night..Southeast winds around 5 kt. Partly cloudy. Waves 1 ft or less.
LMZ740 Expires:201805222130;;355192 FZUS53 KLOT 221350 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 850 AM CDT Tue May 22 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>742-222130-

7 Day Forecast for Marine Location Near North Chicago, IL
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location: 42.35, -87.79     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 221712
afdlot
area forecast discussion
national weather service chicago romeoville, il
1212 pm cdt Tue may 22 2018

Short term
258 am cdt
through tonight...

main forecast concerns challenges are with dense fog this morning
across much of northern il and northwest in.

Weak surface low and associated boundary continue to slowly
progress northeast across the CWA this morning, with much of the
cwa right along and north of this boundary. Very moist low levels
and light winds have allowed the dense fog to persist this
morning, and even expand south southeast into other areas. Vis of
one quarter mile or less will continue, with vis near zero still
possible in some locations. Despite this low continuing northeast
of the area over the next several hours, moisture never really
scours out and with the gradient not increasing, won't likely see
much of any improvement early this morning. May actually see
further south southeast expansion of this dense fog into remaining
areas of the CWA on the backside of this low, south of the
kankakee river valley. Will continue to monitor this possibility,
and add to current advisory if needed. Current end time, mid
morning, of the dense fog advisory looks to be on track at this
time.

With weak ascent overhead, isolated showers will remain possible
over the next couple of hours. Do think any development will
remain rather isolated though, with much of the area remaining dry
early this morning. Low will depart this morning, however, weak
trough will remain situated on the backside of this low and this
could support some weak isolated showers later today mainly over
the far southern cwa. Have not included any mention in the
forecast, given how low chances appear at this time. This trough
quickly shifts out of the area today though, with high pressure
building across the region. Cloud cover will be a challenge later
today into tonight. Although latest guidance would suggest
clearing skies later this afternoon into tonight, not completely
confident with this solution. Did trend this way in the grids, but
could see clouds lingering tonight and fog once again developing.

Building high pressure would support a setup for any cloud cover
that does not scatter today, to likely remain and expand tonight.

Will need to monitor trends and latest guidance and adjust as
needed.

Rodriguez

Long term
319 am cdt
Wednesday through Monday...

high pressure will remain in place across the region at the start
of the period with Wednesday expected to be dry. A warming trend
is expected Wednesday, but will monitor any remaining cloud cover
tonight into Wednesday that could possibly impact high temps.

Overall trend into the end of the work week will be upper level
ridging with a continued warming trend. Some guidance indicating
the possibility for some weak mid level energy to ride along this
ridge Wednesday night into Thursday. If this were to occur, some
isolated precip development could clip areas in far northern il.

Have maintained slight chance pops, but think the higher chances
for precip will remain north of the cwa. By late Friday into the
start of the weekend, the ridge breaks down as upstream energy
dips down across the region. Pattern going into the weekend would
then support periodic and scattered shower thunderstorm
development with highest chances likely during the
afternoons evenings, and above normal warmth.

Rodriguez

Aviation
For the 18z tafs...

conditions continue to gradually improve across the area early
this afternoon. Overall, expect clouds to begin to scatter out
across the area over the next couple hours with a period ofVFR
possible by mid to late this afternoon. However, forecast concerns
quickly focus on the threat of low conditions in fog again tonight
into early Wednesday morning.

A surface ridge of high pressure will build over the area for
tonight. While winds will initially be northeasterly this
afternoon, expect winds to abate quickly during the evening before
becoming light and variable overnight. With clear skies this
evening and ample low-level moisture remaining in place, expect
fog to develop across the area again sometime mid to late this
evening and continue overnight. There remains uncertainty in how
low conditions will get at the main chicago terminals, but the
potential is there for another period of dense fog before
conditions quickly improve Wednesday morning. At the present i
have gone as low as 1 2 mile at dpa, but only down into the 1 to 2
mile range at the main chicago terminals. We will have to watch
for a period of lower visibilities late tonight.

Vfr conditions will return to the area by late Wednesday morning.

Otherwise, expect light easterly winds during the afternoon.

Kjb

Marine
241 am cdt
a weak low will move from northern illinois to the eastern great
lakes today while a weak ridge will remain over the northern great
lakes region and consolidate over the western great lakes behind
the departing low later today. This high will then gradually shift
east to the eastern great lakes by Thursday. Weak flow will be in
place across lake michigan through this time frame. Fog will also
continue at times over the next 24-48 hours. A dense fog advisory
remains in effect for southern half of lake michigan through mid
morning. It's possible it may need to be extended later into the
day. Late in the week, low pressure will form over the canadian
prairies and dig into the upper midwest, though is progged to
weaken during this time. Fresh southwest flow will develop,
especially over the north end of the lake. Winds are expected to
drop off again over the weekend as an expansive high builds over
hudson bay with ridging extending into portions of the great
lakes.

Bmd

Lot watches warnings advisories
Il... None.

In... None.

Lm... Dense fog advisory... Lmz740-lmz741-lmz742-lmz743-lmz744-lmz745-
lmz777-lmz779 until 4 pm Tuesday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WHRI2 - Waukegan Harbor, IL 1 mi46 min NE 8 G 9.9 49°F
45174 16 mi26 min NE 5.8 G 7.8 47°F 47°F1 ft47°F
KNSW3 - Kenosha, WI 17 mi26 min 48°F 1018.6 hPa (+0.3)
FSTI2 27 mi86 min NNW 8 51°F
CHII2 - Chicago, IL 32 mi36 min N 7 G 8.9 49°F 49°F
OKSI2 32 mi86 min Calm G 1.9 52°F
CNII2 35 mi26 min NNE 8 G 12 53°F 49°F
JAKI2 41 mi86 min NE 7 G 9.9 51°F
CMTI2 - 9087044 - Calumet, IL 45 mi38 min NNE 7 G 9.9 51°F 1018.4 hPa51°F
MLWW3 - Milwaukee, WI 48 mi36 min ENE 6 G 6 49°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL6 mi31 minVar 410.00 miOvercast58°F54°F87%1018.4 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL18 mi34 minNE 510.00 miOvercast63°F55°F78%1018.7 hPa
Kenosha, Kenosha Regional Airport, WI18 mi33 minN 010.00 miOvercast60°F55°F84%1018.7 hPa

Wind History from UGN (wind in knots)
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Last 24hrE5E5E5N3NE8NE5NE4CalmN4CalmCalmNW3NW3CalmCalmN3CalmN3N4W3N5NE3E54
1 day agoNE12
G20
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G16
N11NE10NE12NE7NE4N4NE3NE4N5CalmNE4NE7NE6NE6NE4E5E11E13W3E6E6E9
2 days agoE5E4Calm3SE3SE4SW5CalmNE10NE10N12
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G17

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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wmap_A
GOES 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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Chicago, IL (15,3,4,5)
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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.