Thursday, April26, 2018 L-36.com


Marine Weather and Tides
Gurnee, IL

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 5:50AMSunset 7:47PM Thursday April 26, 2018 8:34 AM CDT (13:34 UTC) Moonrise 4:15PMMoonset 4:30AM Illumination 85% 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- 305 Am Cdt Thu Apr 26 2018
Today..West winds around 5 kt becoming southeast late in the morning, then increasing to 10 to 15 kt in the afternoon. Mostly Sunny. Waves 1 to 3 ft.
Tonight..South winds 10 to 15 kt becoming north 15 to 25 kt after midnight. Slight chance of showers after midnight. Waves 1 ft or less building to 2 to 4 ft after midnight.
Friday..North winds 10 to 20 kt becoming southeast 10 to 15 kt in the afternoon. Rain showers and slight chance of Thunderstorms in the afternoon. Waves 2 to 4 ft.
Friday night..North winds 15 to 25 kt. Chance of showers and slight chance of Thunderstorms in the evening. Waves 2 to 4 ft building to 3 to 5 ft after midnight.
LMZ740 Expires:201804261530;;048812 FZUS53 KLOT 260805 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 305 AM CDT Thu Apr 26 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>742-261530-

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 261103
afdlot
area forecast discussion
national weather service chicago romeoville, il
603 am cdt Thu apr 26 2018

Short term
210 am cdt
through tonight...

another quiet weather day is in store across the area as a surface
and mid-level ridge slowly exit to the east. Expect mostly sunny
skies this morning to give way to filtered sunshine this afternoon
as widespread cirrus spread across the area. Temps today will be a
few degrees warmer than on Wednesday, with mid to upper 50s along
the immediate lake michigan shore to the mid 60s inland.

Additionally, with rather dry conditions aloft, daytime mixing
should produce minimum rh values of 25-30% across much of the
area.

A cold front and associated mid-level trough axis extending from
hudson bay to the central high plains will track southeastward
across the CWA during the early morning hours Friday. Given a very
dry antecedent air mass and limited deep forcing, only some very
isolated light showers sprinkles are expected for an hour or two
along the front. Otherwise, conditions will be mostly cloudy with
nnw winds gusts of 20 mph to possibly 25 mph overnight.

Kluber

Long term
244 am cdt
Friday through Wednesday...

amplified upper level pattern in place will bring large
temperature swings during the extended timeframe. Initial cold
front that pushes across the region Thursday night into Friday
should pass through mainly dry given the unfavorable diurnal
timing. Expect a modest cool-down with the first front. North
flow through the day Friday will keep temperatures in the upper
50s to low 60s across northern illinois and northwest indiana,
except for low to mid 50s near the lake with onshore flow through
the day. Meanwhile, a vigorous shortwave will dig into the western
great lakes Friday afternoon and evening bringing a reinforcing
shot of cold air. Steep low level lapse rates will be in place
with passage of the upper level disturbance which should allow for
scattered showers to form and couldn't rule out an isolated low-
topped thunderstorm or two as well. Cold air mass behind the front
will push across the ohio valley Saturday encompassing the entire
midwest. Locally, expect highs only in the low to mid 50s for
much of the cwa, but again cooler by the lake with persistent
onshore flow that will limit temps in the 40s. An expansive
surface high will build across the upper midwest on Saturday
resulting in a modest northerly breeze locally, but otherwise
expect dry and sunny conditions.

By Sunday, surface high will build southeast towards the ohio
valley with winds flipping to southwest across the CWA which
will help moderate temperatures closer to, but still likely below
the seasonal norms. This begins to change as we head into the
upcoming week, though, as strong upper ridge translates east
across the plains into the great lakes. Low-mid level flow
increases out of the southwest as this transition occurs which
will transport an increasingly warm and moist air mass into
portions of the midwest. After a warming trend with nice weather
Monday into at least part of Tuesday when temperatures could top
out near the 80f mark, a more active pattern sets up midweek.

Surface high settles over the southeast allowing ample gulf
moisture to stream north into the midwest. Meanwhile, a series of
shortwaves rounding the base of the upper trough over the
southern plains and lifting into the mid upper mississippi valley
will result in periodic chances for showers and thunderstorms. Way
to early to get into the details with these low amplitude waves,
but large scale pattern does look stormy with potential for strong
to severe storms in or near the local area.

Deubelbeiss

Aviation
For the 12z tafs...

vfr conditions are expected through this evening at all sites. A
complicated wind field is expected today for ord and especially
mdw, though wind speeds should remain under 10kts. Light and
variable winds under a surface ridge this morning will give way to
w to SW flow away from lake mi, but there is increasing
confidence that a developing lake breeze will keep winds backed to
the SE at mdw by late morning. An increasing W to SW flow this
afternoon will compete with the strengthening lake breeze,
possibly causing it to waver around mdw for several hours and
possibly approach ord. The lake breeze will likely pass ord early
this evening.

A cold front will then reach rfd late this evening and ord mdw
during the early overnight hours Friday, bringing a period of
gusty N winds and MVFR ceilings. An isolated -shra will be
possible for an hour or two with the cold front passage.

Kluber

Marine
244 am cdt
light flow is in place across lake michigan this morning under
the influence of high pressure just south of the lake, but
southwest to south winds will gradually pick up through the
afternoon ahead of an approaching cold front. The front will sweep
down the lake this evening and overnight leaving north winds
gusting to 30 kt in its wake. Conditions appear briefly close to
small craft criteria late tonight into early Friday, mainly for
the indiana nearshore zones where the fetch is longest, but will
not hoist any headlines at this time. A stronger cold front will
push down the lake Friday evening and night and will provide
another period of north winds gusting to 30 kt that will gradually
ease through the day Saturday. A small craft advisory will likely
be needed for this time frame. Winds should diminish later in the
day Saturday as high pressure builds towards the region and
remain light on Sunday.

Bmd

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 mi55 min WNW 2.9 G 4.1 45°F
KNSW3 - Kenosha, WI 16 mi35 min 43°F 1014.9 hPa (+0.3)
FSTI2 32 mi95 min NNE 5.1 45°F
OKSI2 36 mi95 min NE 4.1 G 5.1 46°F
CHII2 - Chicago, IL 38 mi45 min NNW 4.1 G 4.1 43°F 33°F
CNII2 40 mi35 min NE 2.9 G 2.9 46°F 29°F
JAKI2 46 mi95 min NNE 2.9 G 5.1 45°F
MLWW3 - Milwaukee, WI 46 mi45 min SW 6 G 6 42°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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Last
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N19
G24
NW17
G21
N18
G24
N18
N14
G19
N12
G16
N11
G16
N11
G16
N10
G14
N6
G9
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N6
1 day
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NW6
G10
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G15
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N9
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N11
G15
N7
G10
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NW8
G11
N5
N5
G8
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G11
NW10
NW16
G22
NW14
G23
NW16
G22
NW14
G22
NW19
G24
NW19
G24
NW21
NW17
G23
2 days
ago
N14
G17
N13
G17
NW13
G18
NW15
G19
N12
G18
NW16
G21
NW16
G20
NW17
NW14
G18
N8
G11
N4
G7
NW5
NW6
N4
N6
N4
N3
N7
N6
G9
N6
N5
NW6
G9
NW6
G9
NW5

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL5 mi40 minNW 410.00 miFair43°F33°F68%1015.5 hPa
Kenosha, Kenosha Regional Airport, WI15 mi42 minN 010.00 miFair42°F33°F71%1015.3 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi43 minNW 310.00 miFair44°F33°F65%1015.6 hPa

Wind History from UGN (wind in knots)
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Last 24hrN13
G21
NE10
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NE11
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N13
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NE14
G20
NE13NE11
G19
NE10
G17
NE10
G17
NE8
G15
NE7NE4CalmCalmCalmCalmCalmCalmW3W3W5W5W3NW4
1 day ago3NE5E8E8E8E9E10NE7E9NE8NE5NE8N7NE8N7N12
G17
N13
G27
N14
G31
N14
G25
N12
G26
N10
G20
N11N8
G17
N9
2 days agoNE11
G16
NE9NE9NE11NE10NE10NE10NE12
G21
NE10
G18
N9
G17
N10
G17
N11
G17
N106CalmNW4NW4CalmCalmNE3E3N3CalmCalm

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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Chicago, IL (9,2,3,4)
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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.