Wednesday, March20, 2019 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 6:53AMSunset 7:04PM Wednesday March 20, 2019 3:54 AM CDT (08:54 UTC) Moonrise 6:46PMMoonset 7:03AM Illumination 99% Phase: Full Moon; Moon at 14 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- 330 Am Cdt Wed Mar 20 2019
Today..Southwest winds 10 to 20 kt. Rain in the morning, then scattered showers in the afternoon. Waves 1 ft or less building to 1 to 3 ft late in the morning.
Tonight..West winds 10 to 15 kt becoming northwest after midnight. Rain showers likely in the evening. Waves 1 ft or less building to 1 to 3 ft after midnight.
Thursday..Northwest winds 10 to 15 kt becoming west in the afternoon. Mostly cloudy in the morning then clearing. Waves 1 to 3 ft.
Thursday night..West winds 15 to 25 kt becoming northwest 15 to 20 kt after midnight. Partly cloudy. Waves 1 to 3 ft building to 2 to 4 ft after midnight.
LMZ740 Expires:201903201515;;641583 FZUS53 KLOT 200830 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 330 AM CDT Wed Mar 20 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>742-201515-


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 200749
afdlot
area forecast discussion
national weather service chicago romeoville, il
249 am cdt Wed mar 20 2019

Short term
249 am cdt
through Thursday...

no major changes to the forecast and still looking like a wet
Wednesday morning commute. Made tweaks to hourly pop trends and
added hourly resolution through mid day tomorrow in line with
radar and cam guidance trends. Extrapolating off the current
position of the area of rain over central ia up to about i-80
lends credence to the gradual northward shift of the rain that has
occurred with this system. It looks like most if not all
locations in the CWA in northern il will receive measurable rain.

Fairly strong moisture transport in 925-850 mb layer from 25-35
kt LLJ will translate the 0.6"+ pwat axis sampled by 00z top raob
eastward over our area, supporting steady to temporary moderate
rainfall rates. Main factor keeping rain amounts in check will be
the fast moving nature of the forcing from the short-wave and
isentropic ascent, with maximum amounts from near south of i-88
down to around kankakee river up to about 1 4 inch, with lighter
amounts north to around 0.1" in state line counties. Other item of
note is the rather breezy south-southwest winds that will
accompany the tail end of the morning rain and persist into the
early afternoon, especially southeast of i-55. Surface low will
open up but still looking at stout pressure falls mid morning
through early afternoon for gusts up to 30 mph in favored corridor
per forecast soundings.

Finally, tomorrow afternoon into the early evening, as another
stout short wave dives southeast with cold front crossing the
region with scattered showers looking like a good bet with that
front. Did not change pops for mid to late pm hours, but did
change showers to coverage wording given good confidence in them
occurring.

Castro izzi

Long term
220 am cdt
Thursday night through Tuesday...

the main forecast concerns through the period continue to be the
increasing potential for a decent cold front to shift over the
area Friday, followed by brief warmup for the weekend, then the
possible arrival of another strong cold front Sunday night.

It appears that a weather system dropping southeastward over the
eastern great lakes will push a cold front down lake michigan and
across our area early Friday. With the passage of this front,
winds are likely to shift northeasterly off the lake setting up a
chilly afternoon (temps in the 30s) for areas around the lake.

While temperatures will be a bit warmer inland, temperatures here
will likely remain in the mid 40s.

Surface high pressure should quickly drop southward over the area
Friday night before shifting to our southeast during the day on
Saturday. After a cold start to the day (temps in the mid to upper
20s) temperatures should warm back to near 50 on Saturday. The
only exception to this will be areas along the lakeshore, where
it appears probable that a lake breeze will develop Saturday
afternoon and result in locally cooler conditions.

Temperatures should inch up a bit more for Sunday, but there will
be increasing cloud cover and chance for some rain showers in
association with an approaching weather disturbance. While there
continues to be uncertainties on the details of the forecast
Sunday night into Monday, there continues to be signs that another
strong cold front could drop southward across the area as strong
high pressure builds southward over the northern plains. Not only
would this result in below normal temperatures for early next
week, but it could also result in a period of wintry precipitation
Sunday night into Monday. However, confidence on the wintry
precipitation is low at this time.

Kjb

Aviation
For the 06z tafs...

rain will be developing over the area towards daybreak as our next
weather disturbance shifts over the area. Expect a period of light
to moderate rain during the early morning, which may produce a
short period of ifr visibilities. Low MVFR CIGS will also develop
over the area for the morning. While CIGS may improve some in the
afternoon, it appears that another batch of rain showers could
move across the terminals late in the afternoon and early evening
as a cold front moves over the area. CIGS may then trend back down
into the MVFR range later tonight with winds shifting to the northwest
in the wake of the front.

Kjb

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
KNSW3 - Kenosha, WI 16 mi55 min S 7 G 8 37°F 1021 hPa (-1.7)
FSTI2 32 mi115 min SSW 17 44°F
CHII2 - Chicago, IL 38 mi35 min SSW 15 G 15 44°F 29°F
JAKI2 46 mi115 min SW 4.1 G 8 44°F
MLWW3 - Milwaukee, WI 46 mi45 min 39°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 mi60 minSSW 910.00 miOvercast38°F28°F68%1021.3 hPa
Kenosha, Kenosha Regional Airport, WI15 mi62 minSW 610.00 miFair37°F28°F73%1021.1 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi63 minS 610.00 miOvercast41°F28°F62%1022.5 hPa

Wind History from UGN (wind in knots)
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Last 24hrW3SW3SW3W43W4SW7SW10SW7
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SE11SE10SE4E3CalmCalmSW4S3CalmSW4S5SW9
1 day agoNW4W53W4W4W6NW6366W7
G14
66NW5W5SW3SW3SW4SW4W3SW4W333
2 days agoCalmCalmCalmCalmW3NW35NW10NW9
G15
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N73E6SE3CalmCalmCalmSW3W3NW4NW4NW4

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Chicago, IL (4,6,7,8)
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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.