Friday, February22, 2019 L-36.com


Marine Weather and Tides
North Chicago, 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 6:36AMSunset 5:33PM Friday February 22, 2019 10:52 AM CST (16:52 UTC) Moonrise 10:27PMMoonset 9:40AM Illumination 89% 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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LMZ740 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 902 Am Cst Fri Feb 22 2019
.gale watch in effect from late Saturday night through Sunday evening...
Rest of today..East winds around 10 kt. Mostly Sunny. Waves 1 ft or less.
Tonight..East winds 10 to 15 kt becoming 10 to 20 kt after midnight. Slight chance of light freezing rain after midnight. Waves 1 to 3 ft building to 2 to 4 ft after midnight.
Saturday..East winds 10 to 20 kt. Chance of light freezing rain in the morning. Rain likely through the day. Waves 2 to 4 ft.
Saturday night..Southeast winds 15 to 25 kt becoming southwest gales to 35 kt after midnight. Rain and slight chance of Thunderstorms in the evening, then chance of rain after midnight. Waves 4 to 6 ft occasionally to 8 ft. Wave forecast is for ice free areas
LMZ740 Expires:201902222215;;336570 FZUS53 KLOT 221502 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 902 AM CST Fri Feb 22 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>742-222215-


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 221150
afdlot
area forecast discussion
national weather service chicago romeoville, il
550 am cst Fri feb 22 2019

Short term
334 am cst
through tonight...

Friday...

another tranquil weather day expected Friday as surface high
pressure prevails across the great lakes. With light winds,
afternoon high temperatures will MAX out close to seasonal
norms... Mid to upper 30s north to lower 40s south. After some
morning clouds... Especially north... Expecting a decent amount of
sunshine before clouds increase again from the southwest later in
the day as a significant storm system becomes better organized over
the plains and moves northeast.

Ed f

Long term
401 am cst
tonight through Thursday...

the primary focus for this period will continue to be the strong and
well advertised low pressure system lifting across the area late
Saturday. Tonight, ahead of the low, warm air aloft will be riding
over subfreezing surface temperatures and bringing yet another
period of freezing rain. An advisory will be posted for counties
most likely to see widespread values exceeding 0.10 inches. This is
not an official threshold, and the advisory may need to be expanded
later as confidence increases in where ice accumulation is most
likely to be a concern. Right now there is still some uncertainty
regarding how long surface temperatures will remain below freezing
once the precipitation begins. Multiple models have been suggesting
temperatures in many locations will climb just above freezing as the
bulk of the rain moves in. This would be a non-diurnal trend with
overnight lows occurring in the evening and then gradual warming
overnight. The other factor is how long dewpoints might remain
below freezing and prolong the ice accumulation due to wetbulb
effects. So the advisory is a starting point where confidence is
presently highest in seeing the most accumulation. In general this
should be pretty short lived everywhere as warm advection continues
into the morning.

Saturday afternoon and evening will continue to be active, likely
after a brief break in the precipitation around mid day. Decent
midlevel lapse rates above the warm advection nose centered at 850mb
may support a few hundred joules of MUCAPE by 00z Saturday evening
toward the southeastern portion of the forecast area. Together with
the position of the surface low just to our west, the likely
presence of a warm frontal boundary across the area, the strong
shear... Southeasterly surface winds, 50+ knots from the south at
850mb, and 85 knots from the southwest at 500mb... And the negatively
tilted shortwave, this might normally be a cause for considerable
concern. The key difference in this case would be the considerably
colder and more stable surface layer that will remain in place
through the period. SPC presently has a marginal risk outlooked
well to our south. This appears reasonable at this stage, but the
potential for elevated severe storms at least in our southeast will
continue to be monitored.

Attention then turns to Sunday as the low lifts north and east of
the area. A very tight pressure gradient in its wake likely will
prompt a wind advisory and there was talk of a high wind watch as
well. For now we elected to hold off on any headlines for the
period, but daytime Sunday will be very windy with a chance of snow
in the morning and falling temperatures through the afternoon.

Beyond Sunday the upper level pattern transitions to more of a zonal
flow with pockets of weak embedded shortwave energy supporting
multiple periods with mostly chance snowfall potential. After a
considerably colder Monday with highs in the upper teens northwest
to upper 20s southeast, the remainder of the week looks just a bit
cooler than normal but fairly steady with highs in the mid 20s to
mid 30s most days.

Lenning

Aviation
For the 12z tafs...

areas of mid high level clouds to filter east across northern il
this morning... Otherwise light north winds will become northeast
and then east by midday. Cloud cover then increases tonight as
cigs lower overnight and area of precipitation spreads in from the
southwest. A brief period of freezing rain is possible (with
light glaze) lasting a few hours starting just before to around
daybreak Saturday. Warmer air surging north will change
precipitation over to all plain rain at ord mdw by around mid
morning.

Ed f

Lot watches warnings advisories
Il... Winter weather advisory... Ilz003-ilz004-ilz005-ilz008... Midnight
Saturday to 9 am Saturday.

In... None.

Lm... Gale watch... Lmz740-lmz741-lmz742-lmz743-lmz744-lmz745... 3 am
Sunday to midnight Monday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WHRI2 - Waukegan Harbor, IL 1 mi73 min NNE 6 G 6 27°F
KNSW3 - Kenosha, WI 17 mi53 min NNE 4.1 G 6 28°F 1030.8 hPa (+0.3)
FSTI2 27 mi113 min ESE 19 32°F
CHII2 - Chicago, IL 32 mi53 min ESE 11 G 12 32°F 26°F
CNII2 35 mi38 min ESE 7 G 11 34°F 25°F
JAKI2 41 mi113 min SE 7 G 8.9 32°F
CMTI2 - 9087044 - Calumet, IL 45 mi53 min E 9.9 G 11 31°F 1030 hPa (+0.8)25°F
MLWW3 - Milwaukee, WI 48 mi43 min Calm G 0 28°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 mi58 minNE 56.00 miPartly Cloudy with Haze31°F21°F69%1031.9 hPa
Kenosha, Kenosha Regional Airport, WI18 mi60 minN 06.00 miFair with Haze32°F21°F64%1031.8 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL18 mi61 minE 67.00 miFair34°F23°F64%1031.6 hPa

Wind History from UGN (wind in knots)
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W7SW7W7W5W5NW6CalmCalmCalmNW3W4NW4NW5CalmN3NW3CalmCalmCalmNE5
1 day agoSE17
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SE11SE5SW8SW12
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2 days agoCalmS3CalmCalmE7E6SE5E3E3E4E4E6E8E9E8E9E9E11
G20
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G24

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 (11,2,3,4)
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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 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.