Friday, June23, 2017 L-36.com


Marine Weather and Tides
Winnetka, IL

Version 3.4
What's New / NOTES
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 5:14AMSunset 8:32PM Friday June 23, 2017 1:56 PM CDT (18:56 UTC) Moonrise 5:01AMMoonset 8:02PM Illumination 0% Phase: New Moon; Moon at 29 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- 901 Am Cdt Fri Jun 23 2017
Rest of today..Northwest winds 10 to 15 kt becoming variable and then southeast to less than 10 kt in the afternoon. Mostly cloudy through early afternoon, then clearing. Waves 1 to 3 ft.
Tonight..Northwest winds 10 to 20 kt. Mostly clear. Waves 1 to 3 ft building to 2 to 4 ft after midnight.
Saturday..West winds 15 to 20 kt. Mostly Sunny. Waves 2 to 4 ft.
Saturday night..West winds 10 to 20 kt. Slight chance of showers in the evening. Waves 1 to 3 ft.
LMZ740 Expires:201706232145;;692040 FZUS53 KLOT 231401 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 901 AM CDT Fri Jun 23 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>742-232145-

7 Day Forecast for Marine Location Near Winnetka, IL
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location: 42.11, -87.74     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 231841
afdlot
area forecast discussion
national weather service chicago romeoville, il
141 pm cdt Fri jun 23 2017

Short term
141 pm cdt
through Saturday...

klot radar getting a breather this afternoon as a cold front has
pushed showers and storms southeast of the area. Comfortable
dewpoints have fallen considerably, with near 50s north to around
60 south with just a few high clouds, and temperatures in the mid
70s to near 80 makes for a fairly pleasant Friday afternoon.

Meanwhile aloft, the upper air pattern features a low over james
bay, with another low near the manitoba lakes region. Several
shortwave disturbances ahead of the latter low will continue in
the westerly flow across the plains. The first disturbance will
lead to clouds and some showers upstream this afternoon, but its
arrival later this afternoon early evening is not favorable for
much in northeast il or northwest in more than some light showers
or sprinkles farther west as higher surface pressures will spread
i.

Expect a quiet night with clearing skies. Winds will hold out of
the west as the surface high remains well off to our west, and low
pressure will shift east through the ohio valley and towards the
atlantic. The upper low across manitoba will spread southeast
through the upper midwest on Saturday morning, then to the western
great lakes late in the day. Fairly cold air aloft for late june
will allow some very steep low level lapse rates to set up. Expect
some later morning to early afternoon cumulus development and
likely some breezy west-northwest winds as the surface pressure
pattern remains the same and decent mixing will occur due to the
steep lapse rates. Forecast soundings do depict a bit of an
inversion around 850 mb or so, which would suggest any showers
that form that would be isolated, shallow and largely void of
thunder. Otherwise, seasonally cool temperatures will top off in
the low to mid 70s, with cool dewpoints dropping into the 40s in
the afternoon.

Kmd

Long term
258 am cdt
Saturday through Thursday...

period of cooler weather will be in place across the area this
weekend and into the start of next week. Appears to be a potential
for a few scattered diurnal showers especially Sunday, though
otherwise pleasantly dry with dew points in the in the 40's and
temps in the 70's. Warmth and humidity then gradually increase
again mid-week, along with a scattered thunderstorm threat.

Series of mid-level short wave disturbances are progged to slide
across the upper midwest western lakes region this weekend, as
building upper ridge along the west coast induces amplification of
downstream trough across eastern north america. Diurnally steep
low level lapse rates are evident in forecast soundings, with a
gradual cooling of mid-level temperatures noted late Saturday with
vort digging across the area. Despite fairly dry low levels with
dew points in the mid-upper 40's, a few isolated-scattered showers
may spread into mainly far northern il during the late
afternoon evening hours, especially in GFS depiction of deeper
(but still weak) instability. Similar scenario persists Sunday and
Monday, as additional vort energy digs southeast across the
region. Despite the potential for these isolated-scattered
convective showers, many dry hours are likely, and coverage will
be lower the farther south you go. Highs over the weekend will be
a good 15 degrees or so cooler than the past few days, with 850 mb
temps cooling to +6 7c Saturday and +5 6c Sunday. This would
support high temps only in the low-mid 70's, with some locations
across far northern il topping out only around 70 especially where
greater stratocu coverage is likely.

Western CONUS upper ridge eventually builds eastward with time as
flow pattern is progged to become more progressive mid-week. This
results in building heights subsidence and surface high pressure
developing across the region Tuesday. Building mid-level heights
will support warming surface temps, with highs expected to be back
around the 80 degree mark. Surface ridge moves off to the east of
the area Tuesday night, with a return to southerly winds coming
on Wednesday. GFS and ECMWF both depict a short wave advancing
through the more zonal upper pattern across the upper midwest
Wednesday into Thursday, with surface low pressure tracking north
of the lakes. Warmer and more humid air mass will support an
increasing thunderstorm threat by this time, and into the end of
the week as a trailing cold front slowly sags into the region.

Ratzer

Aviation
For the 18z tafs...

concerns revolve around wind directions around
ord mdw. Otherwise conditions will be fairly benign.

The lake influence from the cold front has eased, and ord mdw have
settled back to northwest wind direction. Winds at the lake front
do slacken and some form of a lake breeze has formed with
northerly island currently ne, but most locations hold the NW wind.

Current high res- guidance keeps the lake breeze out of ord, and
most guidance keeps it out of mdw as well, though mdw could
briefly jump over to NE this afternoon.

Upper level low pressure across the northern plains will spread
some clouds and showers to NW il and SW wi, but our sites remain
dry. After clearing later today tonight, the upper low will push
to the western great lakes. Expect some afternoon stratocumulus
clouds, with a low chance of a shower.

Otherwise, high pressure will remain across the plains while low
pressure will shift across the ohio valley and to the atlantic
coast on Saturday. This will maintain modest west winds through
the remainder of the TAF period.

Kmd

Marine
307 am cdt
low pressure over far southern james bay will move east across
northern quebec today. The trailing cool front will move across
southern sections of lake michigan this morning as a secondary
area of low pressure moves from southern wisconsin into lower
michigan. Winds will likely fluctuate during the day staying
primarily west or southwest across northern sections and northerly
then northwesterly across the south. It is possible that wind
speeds will be light enough to allow winds across the southern
part of the lake to become onshore for a time this afternoon. A
prevailing west to northwest wind will set up this evening and
trend westerly Saturday. Another low will bring another cool front
down the lake Saturday night as high pressure across the plains
drifts east. This will set up a decent pressure gradient for a
time into Sunday morning. Yet another weak low is expected to
cross the lake early Monday before the high moves across into
Tuesday. Another series of low pressure systems are forecast to
track across the upper lakes starting mid week next week with
strong southerly winds setting up ahead of them.

Mdb

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
45174 5 mi26 min Calm G 1.9 71°F 66°F1 ft62°F
FSTI2 10 mi116 min NE 7 71°F
OKSI2 15 mi116 min N 1 73°F
CHII2 - Chicago, IL 16 mi36 min NE 5.1 G 6 71°F 61°F
45177 16 mi116 min 68°F
WHRI2 - Waukegan Harbor, IL 18 mi76 min N 16 G 20 76°F
CNII2 19 mi26 min 72°F
JAKI2 24 mi116 min E 2.9 71°F
CMTI2 - 9087044 - Calumet, IL 28 mi44 min N 5.1 G 9.9 73°F 1006.1 hPa60°F
KNSW3 - Kenosha, WI 33 mi56 min NW 9.9 G 21 77°F 1005.4 hPa (-0.4)
BHRI3 - Burns Harbor, IN 45 mi55 min NW 4.1 G 9.9 67°F 1007.5 hPa
45170 48 mi26 min WNW 5.8 G 9.7 67°F 68°F1 ft63°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL8 mi64 minNW 710.00 miFair78°F57°F48%1005.8 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi65 minNW 11 G 1710.00 miPartly Cloudy79°F53°F41%1005.3 hPa
Chicago, Chicago Midway Airport, IL22 mi63 minNNW 810.00 miPartly Cloudy79°F57°F47%1004.9 hPa
Chicago/Waukegan Regional Airport, IL23 mi61 minNW 7 G 1710.00 miFair78°F48°F36%1004.4 hPa

Wind History from PWK (wind in knots)
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W6N10NW55N4N4NW9NW9NW10NW7
1 day ago5--E8E7SE8SE6SE5SE4E5SE4SE4CalmSE3S5S7SW12S8SW6SW7S11SW12
G19
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2 days agoN4NE12
G23
E11
G18
SE7E5E6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE5SE8S7SE8SE7

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 (14,3,4,5)
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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.