Sunday, June25, 2017 L-36.com


Marine Weather and Tides
Evanston, 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 5:15AMSunset 8:32PM Sunday June 25, 2017 10:41 PM CDT (03:41 UTC) Moonrise 7:06AMMoonset 9:58PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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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LMZ741 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 935 Pm Cdt Sun Jun 25 2017
Rest of tonight..West winds 10 to 20 kt. Mostly clear. Waves 1 to 3 ft building to 2 to 4 ft.
Monday..Northwest winds 15 to 25 kt. Isolated showers and Thunderstorms in the afternoon. Waves 2 to 4 ft. A small craft advisory may be needed.
Monday night..Northwest winds 10 to 20 kt becoming 10 to 15 kt after midnight. Partly cloudy. Waves 2 to 4 ft.
Tuesday..West winds 10 to 15 kt becoming southwest 5 to 10 kt in the afternoon. Sunny. Waves 1 to 3 ft.
LMZ741 Expires:201706261015;;826726 FZUS53 KLOT 260235 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 935 PM CDT Sun Jun 25 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>742-261015-

7 Day Forecast for Marine Location Near Evanston, IL
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location: 42.03, -87.69     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 260109
afdlot
area forecast discussion
national weather service chicago romeoville, il
809 pm cdt Sun jun 25 2017

Update
802 pm cdt
an upper wave pivoting east-southeastward across wisconsin
continues to generate showers which are tracking southeast across
southeast wisconsin. Some of this activity may clip extreme
northern mchenry and northern lake co. Il before 10 pm cdt
resulting in a sprinkle or brief shower. A few additional cells
have popped up over southeastern lake michigan and have moved into
laporte county. Could see another shower or two develop in this
area and potentially clip northern porter co. In the next hour or
two but the chance is minimal. Otherwise have made minor tweaks to
temp trends with a cool night in store. A few spots could drop
into the upper 40s but expect the majority of the area to remain
at 50 or better, with mid to upper 50s in the chicago metro.

Mdb

Short term
224 pm cdt
through Monday...

little change necessary for the going forecast for the short term
forecast period. Main concerns focus on unseasonably low
temperatures and diurnal cloud cover pcpn trends.

Broad upper troughing remains in place, over the eastern 2 3 of the
conus with high amplitude ridging over the west coast. A series of
weak impulses will continue to drop through the nwly flow aloft, out
of the upper mississippi valley and across the great lakes region.

Broad cyclonic flow aloft will help generate increasing diurnal cu
coverage for the late morning through early evening hours. Under
the cyclonic curvature aloft, daytime warming coupled with
unseasonably cold air aloft will generate scattered showers with
isold thunderstorms possible durg the afternoon hours INVOF the
short wave energy dropping through the nwly flow aloft. The pattern
has remained very slowly progressive, so conditions for tomorrow
will largely be similar to today, with chances for sct shra isold
tsra from late morning through early evening. For the overnight
hours, sky cover should become mostly clear. Temperatures today
should top out in the lower 70s. As short wave energy dropping
around the swrn periphery of the upper trough should help increase
the amplitude of the upper trough, with heights lowering a little
tomorrow. With general cold advection through a deep layer and
lowering heights, temperatures tomorrow should be a couple degrees
lower, with highs in the upper 60s to lower 70s. As cloud cover and
winds diminish overnight, temperatures tonight should drop into the
upper 40s to lower 50s, except for the urban heat island of the
chicago metro area, where temperatures should only drop into the
upper 50s.

Long term
249 pm cdt
Monday night through Sunday...

upper level heights will build Monday night as low pressure that
has brought our cooler and occasionally through briefly showery
weather will shift to the eastern third of the country. Surface
high pressure, which has been parked over the center of the conus
will shift across central il early Tuesday and to the eastern ohio
valley later in the day. Model time heights depict a largely cloud
free day, save for some possible high clouds, and with warm
advection behind the high, temperatures will rebound back a little
bit closer, though still a tad shy of normal for late june.

Dampening upper level ridging will keep Tuesday night dry, but
warm moist advection will ensue of ahead of low pressure to the
west, zonal and active flow aloft, while the gulf of mexico
moisture will open up a bit more. Overnight convection across the
plains will be driven by a strong low level jet and a lower
amplitude shortwave. This wave and an associated cold front will
near our region late in the day and Wednesday night. Models are in
fairly good agreement with the pattern with some modest
disagreement in timing, leading to a likely period of showers and
thunderstorms. Severe chances are not zero given the strength of
the low to mid level wind fields, but the timing of the activity
does suggest a possible weakening trend with some chances
lingering for heavy rainfall, especially in our western areas.

There looks to be a lull Thursday morning as this wave will shift
east. The frontal boundary will stall out a bit somewhere in the
region as low pressure to the north will promote a continued
warm moist feed from the southwest. This will continue a warm and
somewhat muggy pattern, with occasional chances for showers and
thunderstorms ahead of an upper low across the canadian prairies
that will slowly shift to the upper midwest and eventually to the
western great lakes this weekend. The best chances Thursday appear
along and south of our area which is where the frontal boundary
may linger. It is along and south of this axis that will stand a
severe threat as instability increase ahead of the upper trough.

Our best chances of precipitation would be Thursday night. There
are additional chances on Friday ahead of this system's cold
front. Temperatures will hold around normals in the lower to mid
80s, likely tempered by at least occasional cloudiness and
dampened during wet periods. Saturday does appear to be a drier
period as a more benign surface pressure pattern becomes a bit
more evident. As mentioned in the overnight shift discussion, the
overall weather pattern supports milder conditions with occasional
bouts of storms, but upstream activity will play a role in our
local impacts.

Kmd

Aviation
For the 00z tafs...

650 pm... Gusty westerly winds will diminish with sunset this
evening and likely below 10kts overnight. Speeds gusts will
increase after sunrise Monday morning and for a time through early
afternoon... Gusts into the mid 20kt range are likely with some
isolated higher gusts possible. Wind directions will slowly turn
to the northwest by mid afternoon and north northwest by late
afternoon. An outflow lake enhanced boundary is expected to move
south down lake michigan late Monday afternoon into early evening.

This will likely shift winds to the northeast at the chicago area
terminals. Only medium confidence and changes to timing are
possible with later forecasts.

Scattered showers across south central wi will continue moving
southeast this evening and should remain northeast of the
terminals but trends will need to be monitored over the next few
hours. An upper wave will move southwest of the terminals Monday
morning with showers and perhaps a few thunderstorms. Another
upper wave will move across the western great lakes region Monday
afternoon into Monday evening. Isolated showers and thunderstorms
with this wave may move south into northeast il late Monday
afternoon into early Monday evening but confidence is low. Its
possible the terminals remain mainly dry... Split between precip
from these two features. Cms

Marine
249 pm cdt
a cold front extending from low pressure across the northern
great lakes region will push southeast over lake michigan tonight.

The stagnant pattern of high pressure to the west and low pressure
to the east will then hold for one more day with a slight uptick
in the west northwest winds, reaching near 25 kt. High pressure
across the plains will shift south of lake michigan on Tuesday,
which will ultimately shift winds to southerly through the day,
and winds will largely hold a south component through late
Thursday night. The high will shift to the eastern ohio valley
late Tuesday and to the atlantic basin Wednesday. Meanwhile, a
decent (995 mb) low across the northern plains will shift to
northern wi by early Thursday. A fairly tight pressure gradient
later Wednesday into early Thursday may bring winds close to 30
kt. The low will weaken over northern lake michigan ahead of a
cold front that will move over the lake Friday night. Winds will
generally settle to more of a west-northwest at this point.

Kmd

Lot watches warnings advisories
Il... None.

In... Beach hazards statement... Inz002 until 4 am Tuesday.

Lm... None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FSTI2 4 mi101 min W 9.9 63°F
45174 7 mi21 min W 12 G 16 63°F 64°F1 ft53°F
OKSI2 9 mi101 min NW 2.9 65°F
CHII2 - Chicago, IL 10 mi41 min W 16 G 18 65°F 50°F
45177 10 mi161 min 66°F
CNII2 13 mi26 min 64°F
JAKI2 18 mi101 min WNW 4.1 64°F
CMTI2 - 9087044 - Calumet, IL 22 mi41 min W 7 G 13 64°F 1019 hPa (+1.0)49°F
WHRI2 - Waukegan Harbor, IL 24 mi61 min WNW 9.9 G 24 58°F
BHRI3 - Burns Harbor, IN 39 mi61 min WNW 18 G 21 65°F 1019.3 hPa
KNSW3 - Kenosha, WI 39 mi41 min W 7 G 11 61°F 1018.6 hPa (+1.0)
45170 43 mi21 min WNW 19 G 25 65°F 66°F4 ft54°F
MCYI3 - Michigan City, IN 46 mi21 min W 22 G 27 64°F 52°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, IL12 mi49 minW 610.00 miMostly Cloudy62°F51°F67%1019.6 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi50 minW 710.00 miPartly Cloudy62°F48°F62%1019.2 hPa
Chicago, Chicago Midway Airport, IL17 mi48 minW 710.00 miA Few Clouds63°F48°F60%1019.1 hPa

Wind History from PWK (wind in knots)
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Last 24hrNW5SW5W5W8W5W5W4W6W9W9W7W12W14
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1 day agoNW11NW64W8W8NW6NW6W4W7NW7W9W9
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2 days agoS9
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W6N10NW55N4N4NW9NW9NW10NW7NW12
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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
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IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Chicago, IL (23,6,7,8)
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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.