Thursday, January24, 2019 L-36.com


Marine Weather and Tides
Evanston, IL

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:09AMSunset 4:56PM Thursday January 24, 2019 5:16 AM CST (11:16 UTC) Moonrise 10:25PMMoonset 10:40AM Illumination 87% Phase: Waning Gibbous; Moon at 18 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 Expires:201901241630;;843641 Fzus53 Klot 240935 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 335 Am Cst Thu Jan 24 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>742-241630- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 335 Am Cst Thu Jan 24 2019
.small craft advisory in effect from noon cst today through Friday morning...
.heavy freezing spray warning in effect from this evening through Friday evening...
Today..West winds 10 to 15 kt increasing to 20 to 30 kt this afternoon. A few gale force gusts to 35 kt late. Freezing spray. Slight chance of snow showers in the afternoon. Waves 2 ft or less in the morning building to 2 to 4 ft through the afternoon.
Tonight..West winds to 30 kt. Occasional gale force gusts to 35 kt in the evening. Heavy freezing spray. Waves 3 to 5 ft.
Friday..West winds 15 to 25 kt. Heavy freezing spray. Chance of snow in the afternoon. Waves 2 to 4 ft subsiding to 1 to 3 ft in the afternoon.
Friday night..West winds 10 to 15 kt becoming northwest after midnight. Chance of snow in the evening. Heavy freezing spray in the evening, then freezing spray overnight. Waves 1 ft or less. Wave forecast is for ice free areas
LMZ741


7 Day Forecast for Marine Location Near Evanston, IL
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location: 42.03, -87.69     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 240940
afdlot
area forecast discussion
national weather service chicago romeoville, il
340 am cst Thu jan 24 2019

Short term
320 am cst
through tonight...

main forecast concerns challenges are with a push of much colder
air which will bring a period of scattered light snow and blowing
snow this afternoon, and then subzero low temps with wind chills
of 20 below to 30 below zero tonight into Friday morning. A wind
chill advisory is in effect for the entire area for tonight Friday
morning.

In the near term, surface ridging is occurring with winds
diminishing and with the low stratus continuing to depart to the
east. Expect this cloud cover currently over northwest in to exit
over the next couple of hours, with a small window of clear skies
likely. Under these clear skies have seen temps really fall and
expect this trend for the next several hours. Coldest temps in the
single digits expected across north central il this morning,
where surface ridge is also located.

Deep upper trough to the northwest will continue to dig across
the upper midwest and great lakes region today, while surface
low trough pushes east through central lakes and with associated
strong cold front expected to quickly dive southeast this morning.

Cloud cover with this system already approaching northern il at
this time, and expect this cloud cover to continue southeast with
cloudy skies returning this morning. Front will be noted with a
quick wind shift to the northwest, likely occurring across the
western half of the CWA by late morning midday. This wind shift
continues through the remaining CWA through the afternoon, along
with increasing winds gusts and chances for scattered light snow
showers. Do think much of northern il and northwest in will see
gusts around 35 mph for a time this afternoon into this evening,
however, do think slightly higher gusts approaching 40 mph will be
possible across north central il. These winds gusts will likely
support some blowing snow across portions of northern il this
afternoon into this evening. Locations northwest of a line from
peru to lake forrest il do have a drier snow in place, and think
the chances are the highest for blowing snow in these locations.

At this time, don't think a winter weather advisory is warranted,
but will address this possibility in an sps. Scattered light snow
showers are expected this afternoon, however, at this time don't
think there will be much of any accumulation outside of light
dusting of a couple of tenths of an inch of snow. Flurries may
linger a little early in the evening, but forcing and cloud cover
departing to the east will end this potential.

Still anticipate rather cold temps and low wind chills tonight,
with only minor changes made to this period. Temps are expected to
fall this afternoon area wide, and this fall will continue early
in the evening as this cold air mass spills south and with
clearing skies expected. Temps well below zero area wide with a
steady wind are likely tonight, and will support wind chills of 20
below to 30 below zero. With these wind chills, replaced the wind
chill watch which was in place across north central il with a
wind chill advisory. Still think there is some potential for wind
chills to fall to or below 30 below zero at times early Friday
morning across north central il. At this time, this is not
expected to be too widespread or too long lasting. However, this
will need to continue to be monitored today, with the possibility
of some locations observing lower winds chills, and for a longer
duration. Wind chills will slowly improve Friday morning, but with
wind chills well below zero expected for the remainder of the
day.

Rodriguez

Long term
340 am cst
Friday through Wednesday...

period will likely remain active and rather cold, with periodic
chances for snow expected while additional pushes of colder air
spill south across the region. Quick moving system expected to
move southeast across the region Friday afternoon into the evening
which could provide some light snow. Some model variability with
the track of this system, but with the highest chances for this
snow expected to stay south of i-80. Only light snow accumulations
of an inch to an inch and a half are possible at this time. Temps
around zero to well below zero are expected Friday night with
surface ridge quickly building in on the backside of this system.

This ridge will provide light winds, and think wind chills will be
limited. Anther chance for light snow is possible Saturday
afternoon into Saturday night along with another push of cold air.

Next chance of accumulating snow and a period to keep an eye on
will be Sunday night into Monday when most guidance showing
another low dropping southeast across the region. This still
appears to be a possibility, but some guidance this past evening
is indicating the possibility for a more northerly track. If this
were to occur, then the area could be dealing with another wintry
mix and some liquid precip. This system then departs, with the
region then likely observing an arctic air mass spilling south
through the central conus. This has the potential to support
bitterly cold temperatures and potentially dangerously cold wind
chills mid next week and will be a period to keep an eye on.

Rodriguez

Aviation
For the 06z tafs...

primary forecast remains the potential for snow showers flurries
early Thursday afternoon.

A cold front will move across the area early Thursday afternoon
and there remains a chance of snow showers or very light snow
during this time period. Confidence remains low and opted to keep
prob mention going with this forecast. If snow does materialize...

there is the potential for brief ifr vis and perhaps a dusting of
snow accumulation but likely not in all areas.

MVFR CIGS are expected to shift east of the chicago area terminals
in the next 1-2 hours with a period of mainly clear skies
overnight with more MVFR CIGS spreading across the area Thursday
morning. These MVFR CIGS may persist longer than expected... Well
into Thursday evening... With uncertainty regarding when these cigs
will scatter out.

West northwest winds around 10kt will become more westerly by
morning. Wind speeds gusts will increase behind the cold front
with gusts into the mid 20kt range. By late afternoon or early
evening... Forecast soundings suggest there could be a several hour
period of winds gusting toward 30kt... Which then slowly diminish
later Thursday night into early Friday morning. Cms

Lot watches warnings advisories
Il... Wind chill advisory... Ilz003-ilz004-ilz005-ilz006-ilz008-ilz010-
ilz011-ilz012-ilz013-ilz014-ilz019-ilz020-ilz021-ilz022-
ilz023-ilz032-ilz033-ilz039... 6 pm Thursday to noon Friday.

In... Wind chill advisory... Inz001-inz002-inz010-inz011-inz019... 6 pm
Thursday to noon Friday.

Lm... Heavy freezing spray warning... Lmz740-lmz741-lmz742-lmz743-
lmz744-lmz745... 6 pm Thursday to 9 pm Friday.

Small craft advisory... Lmz740-lmz741-lmz742... Noon Thursday to 9
am Friday.

Small craft advisory... In nearshore waters until 4 am Thursday.

Small craft advisory... Lmz743-lmz744-lmz745... Noon Thursday to 3
pm Friday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FSTI2 4 mi76 min SW 11 15°F
CNII2 13 mi16 min W 5.1 G 8.9 17°F 12°F
JAKI2 18 mi76 min W 5.1 G 6 17°F
CMTI2 - 9087044 - Calumet, IL 22 mi28 min SW 5.1 G 8 16°F 1010 hPa12°F
WHRI2 - Waukegan Harbor, IL 24 mi36 min W 7 G 8 12°F
BHRI3 - Burns Harbor, IN 39 mi36 min W 5.1 G 7 22°F 1011.2 hPa
KNSW3 - Kenosha, WI 39 mi16 min W 8 G 9.9 11°F 1009.5 hPa (-1.0)

Wind History for Calumet Harbor, IL
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Last
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NE4
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G9
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G16
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G14
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SE9
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G19
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G23
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G15
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G17
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G12
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G8
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SE2
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NW2
2 days
ago
SE3
G7
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G11
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G13
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E8
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SE9
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G16
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SE6
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G17
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G16
SE11
G20
SE9
G14
SE9
G13

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL12 mi24 minSSW 36.00 miFair with Haze12°F6°F77%1011.3 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi25 minWSW 37.00 miFair11°F8°F88%1011.1 hPa
Chicago, Chicago Midway Airport, IL17 mi23 minSW 48.00 miFair13°F9°F84%1012.1 hPa

Wind History from PWK (wind in knots)
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Last 24hrNE8NW7NW7NW9NW8NW10NW10NW9NW13
G20
NW10NW8NW8W5NW8NW10NW9W7NW4W6W5W3W3W3SW3
1 day agoSE11SE12S12S13S14S12S10S7S7S8S8S8S7S7S6S4SE3CalmCalmCalmN3NE6N5N9
2 days agoCalmW4CalmS6S6SE7S10S12SE9SE11SE7SE7S11SE10SE7SE7SE8
G17
SE12
G19
SE11SE11
G21
S12SE8S8SE8

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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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.