Tuesday, December18, 2018 L-36.com


Marine Weather and Tides
Gurnee, 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 7:14AMSunset 4:22PM Tuesday December 18, 2018 5:34 AM CST (11:34 UTC) Moonrise 2:52PMMoonset 3:23AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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- 309 Am Cst Tue Dec 18 2018
Today..Variable winds less than 10 kt becoming south 10 to 15 kt this morning, then increasing to 10 to 20 kt. Sunny. Waves 1 to 3 ft.
Tonight..South winds 15 to 20 kt. Mostly clear. Waves 1 to 3 ft.
Wednesday..South winds 15 to 20 kt. Partly Sunny. Waves 1 to 3 ft.
Wednesday night..South winds 10 to 20 kt. Slight chance of rain after midnight. Waves 1 to 3 ft.
LMZ740 Expires:201812181630;;970193 FZUS53 KLOT 180909 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 309 AM CST Tue Dec 18 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>742-181630-


7 Day Forecast for Marine Location Near Gurnee, IL
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location: 42.38, -87.94     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 181129
afdlot
area forecast discussion
national weather service chicago romeoville, il
529 am cst Tue dec 18 2018

Short term
230 am cst
through Wednesday...

mild but otherwise quiet weather conditions expected in the near
term across northern illinois and northwest indiana. Ridge of high
pressure stretches from the western great lakes to the mid
mississippi river valley early this morning and will settle over
the upper ohio river valley by this evening. Southwest flow
overspreads the region in its wake and warm air advection and
mostly sunny skies should push temperatures several degrees higher
today than yesterday. Expect afternoon highs to top out in the
mid to upper 40s, and wouldn't be out of the realm of possibility
to see some locations tag 50f.

Temperature forecast a little more tricky for Wednesday. Cloud
cover is expected to increase through the day. Guidance suggests
a low amplitude shortwave trough will lift across the region
early on Wednesday, coinciding with persistent corridor of waa.

Forecast soundings show that low level saturation will occur
during this time frame, and couldn't rule out a few light
sprinkles or possibly some drizzle, particularly over north
central illinois. Forcing is expected to be strongest north of the
cwa, so will only carry silent 10 percent pops at time, but
something to keep an eye on. Cloud cover and precip chances will
affect temps on Wednesday. 850 temps of +5-6c are expected to be
in place over the region, which climo suggests would support
temperatures into the 50s, though this is likely contingent on
cloud cover. Remain a bit conservative with temps Wednesday, but
there is some upward potential from going forecast.

Deubelbeiss

Long term
230 am cst
Wednesday night through Monday...

a deep upper trough is expected to inch east across the great
plains midweek. A closed low at the base of the trough is expected
to shift east across the lower mississippi valley Wednesday, then
lift to the upper ohio valley Friday. A northern wave is expected
to dig across the great lakes on Thursday. While the best forcing
stays north and south of the local area with these waves, there
will still likely be a period of precipitation late Wednesday
night into Thursday. Forecast soundings show that most of the
precipitation should fall as rain, but could be a brief change
over to snow before precip ends late Thursday or early Friday.

Upper level flow is highly meridional, and the 0c 850mb isotherm
is expected to spill into the deep south by Thursday, with the
thermal trough shifting east across the local area on Friday.

Expect temps to top out in the upper 30s or lower 40s across the
nw CWA Thursday, but in the mid to upper 40s in the SE cwa. Temps
may peak early in the day, then hold steady or fall into the 30s
with little if any recovery expected on Friday as that thermal
trough moves overhead.

Broad surface ridge will build across the region Friday into early
next week, and should provide generally dry and seasonable
conditions. Temperatures top out in the 30s through the remainder
of the forecast period early next week. May have to keep an eye on
a hybrid clipper pacific wave over the weekend, but there is poor
consensus on the track of this system this far out.

Deubelbeiss

Aviation
For the 12z tafs...

quietVFR aviation weather continues through this TAF period.

Light southerly winds will increase this morning, with speeds
around 10 kts persisting through the day and into tonight.

Increase in mid and high clouds expected late tonight into
Wednesday.

Rodriguez

Lot watches warnings advisories
Il... None.

In... None.

Lm... None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WHRI2 - Waukegan Harbor, IL 7 mi54 min NNW 2.9 G 2.9 29°F
KNSW3 - Kenosha, WI 16 mi34 min Calm G 1.9 30°F 1023.4 hPa (-0.3)
FSTI2 32 mi94 min SSE 8 33°F
CHII2 - Chicago, IL 38 mi34 min SE 13 G 14 36°F 33°F
CNII2 40 mi19 min S 1.9 30°F 26°F
JAKI2 46 mi94 min SW 4.1 G 5.1 32°F
MLWW3 - Milwaukee, WI 46 mi24 min Calm G 0 29°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL5 mi39 minN 010.00 miFair20°F15°F81%1024.6 hPa
Kenosha, Kenosha Regional Airport, WI15 mi41 minN 010.00 miFair22°F19°F89%1024 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi42 minN 010.00 miFair24°F19°F81%1024.8 hPa

Wind History from UGN (wind in knots)
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Last 24hrNW11
G18
NW755NW86NW5NW53NW6CalmCalmCalmCalmCalmN3CalmNW3NW3CalmCalmCalmCalmCalm
1 day agoCalmSW3W3W4W7W7W7W5W8W7W43W4W4W4W74W555W56NW9
G19
NW8
2 days agoN4N4NE4NE4NE8NE6NE8NE8NE7NE7N6N3N3N6N4N4N4NW3NW3NE4NW33SW3Calm

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    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.