Sunday, August20, 2017 L-36.com


Marine Weather and Tides
Gurnee, IL

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:03AMSunset 7:45PM Sunday August 20, 2017 2:46 AM CDT (07:46 UTC) Moonrise 4:40AMMoonset 7:10PM Illumination 4% Phase: Waning Crescent; Moon at 28 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- 939 Pm Cdt Sat Aug 19 2017
Rest of tonight..Southeast winds 5 to 10 kt becoming south. Clear. Waves 1 to 2 ft.
Sunday..South winds 10 to 15 kt becoming southeast in the afternoon. Mostly Sunny. Waves 1 to 2 ft.
Sunday night..South winds 10 to 15 kt becoming southwest after midnight. Slight chance of showers and Thunderstorms after midnight. Waves 1 to 2 ft.
Monday..Southwest winds 10 to 15 kt. Slight chance of showers and Thunderstorms. Waves 1 to 2 ft.
LMZ740 Expires:201708200900;;652674 FZUS53 KLOT 200239 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 939 PM CDT Sat Aug 19 2017 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>742-200900-

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 200701
afdlot
area forecast discussion
national weather service chicago romeoville, il
201 am cdt Sun aug 20 2017

Short term
156 pm cdt
tonight and Sunday...

dry, quiet weather expected to finish the weekend, with warmer
and slightly more humid conditions for Sunday.

High pressure was drifting east across the forecast area this
afternoon, with sunny skies and light winds making for pleasant
weather. Light winds will turn southeasterly tonight as the high
drifts off to the east, with clear skies and light flow allowing
for the development of some patchy shallow ground fog in a few
spots by sunrise Sunday morning.

Winds will turn southerly Sunday, with enough gradient flow to
limit any lake breeze cooling primarily to the immediate il shore
area north of chicago. Progged 925 mb temps of +23-25c should
support highs in the 85-90 degree range by afternoon, with a
gradual return of low-mid 60's surface dew points making it feel a
bit more humid. Forecast time-height sections and soundings
suggest plenty of sunshine, though some increase in thin high
cloud is likely late in the day.

Ratzer

Long term
156 pm cdt
Sunday night through Saturday...

warm and somewhat humid conditions will be in place through the
first couple days of the upcoming week, with drier and cooler
conditions arriving for the latter half of the week.

High pressure providing fair weather to the region this weekend
will shift to the mid atlantic coast by Monday while broad and
disorganized area of low pressure sets up over the central great
plains. Deep corridor of southerly flow will help to transport
higher dewpoints back into the region while 850mb thermal ridge
overhead will allow surface temps to warm into the mid to upper
80s Monday afternoon. Guidance continues to suggest widespread
convection off to our west Sunday night approaching or entering
the local area Monday morning. Unstable conditions will be in
place Monday and it remains plausible for showers and
thunderstorms to develop on remnant outflow boundaries or any mcv
that is able to track across the area. Confidence in details
remains low at this distance given lack of broad scale synoptic
support Monday, but will continue to maintain chance pops and
partly to mostly cloudy sky cover.

Monday night into Tuesday, a strong upper wave is progged to dig
across the upper midwest and great lakes carving out a deep trough
across the eastern half of the country and is expected to persist
through the end of the week. At the surface, low pressure will
develop over the great lakes with a trailing cold front sagging
south across northern illinois Tuesday morning and afternoon.

Showers and thunderstorms will be likely with FROPA and the
potential for moderately strong instability and increasing deep
layer shear may allow for some degree of a severe threat across
the cwa.

Behind the front, an expansive high will build south from the
canadian prairies into the upper midwest transporting a cooler and
drier airmass over the region. Wednesday through Saturday should
see plenty of sunshine each day with highs only in the 70s and
dewpoints much more comfortable in the 50s
deubelbeiss

Aviation
For the 06z tafs...

for the chicago TAF sites today and tonight, concerns are south-
southwest winds approaching 10 kt during the afternoon and a
small chance for showers tonight.

Early this morning, patchy fog likely shallow in nature has been
observed at a handful of outlying locations. Could see some of
this at dpa, rfd, and gyy. Confidence in this remaining out of ord
and mdw is high.

Light southeast winds should become south-southwest by mid-
morning, maybe as late as late morning. Speeds will increase with
8-10 kt expected at ord and mdw by 19z-20z. Winds will drop in
speed near sunset and back slightly to due south or a little east
of south. Confidence in winds for this TAF is medium- high.

Convection across the nebraska iowa border region early this
morning will evolve slowly east-southeast and should see a
weakening trend through the morning. An upper level disturbance is
likely to move due east though, and over the TAF sites by late
day evening. Cannot rule out isolated showers with this, even
possibly a thunderstorm or two toward rfd. But confidence in how
much instability will be present for precipitation is low. For
overnight into Monday morning, a more noteworthy chance for
showers and storms will begin across eastern iowa into
northwest north central illinois.

Mtf

Marine
159 am cdt
as high pressure moves east today, winds will turn southerly
across the lake. The exception will be in the illinois nearshore,
where southeast to possibly due east onshore winds will be seen
in the afternoon. The highest speeds over the lake today will be
across the northern part, with the far north seeing gusts of
20-25 kt late today into this evening.

Low pressure will take shape across northern lake michigan by
daybreak Tuesday, and accelerate and deepen as it tracks eastward
during the day Tuesday. Given the pressure gradient in its wake,
northwest winds will increase with 20-25 kt gusts likely. The
northwest direction on Tuesday would favor small craft advisory
winds and waves across the indiana nearshore and possibly the
illinois one due to winds.

Mtf

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 mi67 min SSW 1.9 G 2.9 69°F
KNSW3 - Kenosha, WI 16 mi47 min SW 4.1 G 6 69°F 1015.9 hPa (+0.7)
45174 23 mi27 min SSE 7.8 G 9.7 73°F 73°F1 ft67°F
FSTI2 32 mi167 min SSE 4.1 73°F
45177 38 mi167 min 75°F
CHII2 - Chicago, IL 38 mi27 min S 9.9 G 9.9 73°F 61°F
JAKI2 46 mi107 min SSW 1.9 70°F
MLWW3 - Milwaukee, WI 46 mi37 min SW 7 G 8 71°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 mi52 minN 09.00 miFair61°F59°F93%1015.1 hPa
Kenosha, Kenosha Regional Airport, WI15 mi54 minN 010.00 miFair62°F55°F80%1016 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi55 minN 010.00 miFair64°F60°F87%1016 hPa

Wind History from UGN (wind in knots)
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Last 24hrNW3NW5NW4CalmNW4NW4CalmCalmCalmCalmCalmCalm5SE8SE8SE8SE5S6S4CalmCalmCalmCalmCalm
1 day ago4454435NW5NW7NW8W8W8W7W74W5CalmW4CalmCalm3W33W3
2 days ago--------SW10SW7S9S12SW11SW11SW13SW13
G21
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G17
46W8664

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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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Chicago, IL (3,6,7,8)
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Ground Weather Radar Station Chicago, IL
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weather_mapweather_map weather_map

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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.