Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
North Riverside, 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 5:52AMSunset 7:45PM Wednesday April 25, 2018 12:59 PM CDT (17:59 UTC) Moonrise 3:08PMMoonset 3:56AM Illumination 79% Phase: Waxing Gibbous; Moon at 10 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- 947 Am Cdt Wed Apr 25 2018
.small craft advisory in effect through this evening...
Today..North winds to 30 kt diminishing 20 to 25 kt by early afternoon then to 15 to 20 kt late in the afternoon. Sunny. Waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to 6 ft occasionally to 8 ft.
Tonight..North winds 10 to 15 kt. Clear. Waves 3 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft by midnight.
Thursday..Southwest winds 5 to 10 kt becoming southeast 10 to 15 kt in the afternoon. Sunny. Waves 1 to 3 ft.
Thursday night..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 3 to 5 ft after midnight.
LMZ741 Expires:201804252145;;480350 FZUS53 KLOT 251447 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 947 AM CDT Wed Apr 25 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>742-252145-

7 Day Forecast for Marine Location Near North Riverside, IL
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location: 41.84, -87.82     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 251751
afdlot
area forecast discussion
national weather service chicago romeoville, il
1251 pm cdt Wed apr 25 2018

Update
1244 pm cdt
have made only minor tweaks to hourly temp wind grids for the
afternoon as the going forecast remains on track. Temps continue a
slow rise well inland of the lake and highs around 60 are on
track. Temps have leveled off in the chicago metro and areas near
the lake so forecast highs in the 40s 50s look to be in good
shape.

Mdb

Short term
207 am cdt
through tonight...

north winds have generally been gusting 20-30 mph with a few gusts
to 35 mph behind a cold front crossing the CWA early this
morning. This will continue into the daylight hours with an
enhanced pressure gradient in place as weak troughing slowly exits
central southern illinois. Expect these winds to ease slightly by
this afternoon, then quickly diminish tonight as a weak surface
ridge builds in from the west.

A rather dry airmass per upstream raobs and satellite trends will
supports sunny skies today with some passing cirrus and maybe a few
cumulus clouds through early afternoon. Guidance has continued to
show a slight cool-bias with sunny days over the past week, so have
increased MAX temps a couple degrees away from the moderation of
lake michigan. MAX temps today are expected to range from the upper
40s along the immediate shore to the low 60s well inland.

Kluber

Long term
228 am cdt
Thursday through Tuesday...

the long range features an upper air pattern shift and one to
provide a stretch of warmer than normal days. It has been two
months since we have had consecutive days with well above normal
temperatures (10+ degrees), and even two months since some
locations have had one! But that looks highly likely to end early
next week. General northwest flow aloft into the weekend will
shift west-southwesterly for next week. While some small rain
shower chances late Thursday night, and possibly Friday evening,
it looks mainly dry through Tuesday.

High pressure will move over the area during the day Thursday,
with a lake breeze anticipated. Thursday looks like a day with
deep mixing and humidity could drop to 25 percent or less in some
spots.

A cold front will move through the area Thursday night. The best
forcing for showers is to the north, but it is possible overnight
some are seen in the cwa. The parent upper level feature,
indicated by a strong vorticity maximum, drops southeast over the
western great lakes Friday afternoon into the evening. This could
support spotty showers, mainly in far northeast illinois into
northwest indiana, with the better chance again to our northeast.

Sunny and low humidity but light wind conditions are expected
through the weekend. Upper ridging moves of the area later Sunday
and the low-level thermal ridge to the immediate west of this
ridge then spreads in for Monday. With gradual cyclogenesis across
the rockies, and a strengthening surface high offshore of the
southeast u.S., well-above normal temperatures are forecast to
advect northeast between these features. Climatology for the
850 925 mb temperatures would support local highs well into the
70s, with low 80s in some areas probable by Tuesday and even
Wednesday if no showers storms. Have collaborated warmer than
the guidance blend during that time. These days look breezy too.

Moisture should be on the increase especially by Tuesday, so fire
weather concerns at this time look low, but may need to watch how
quickly moisture returns on Monday.

The setup favors convection across the plains into the upper
mississippi valley during the first half of next week. Too far
out to say timing for us midweek, but as the upper ridge begins
to break down (sometime within Tue night - Thu given current
forecast solutions), there will likely be thunderstorm chances.

Mtf

Aviation
For the 18z tafs...

tight pressure gradient remains in place but is loosening as
surface ridging approaches. As a result, northeast winds remain
breezy with gusts into the low 20s which will continue through the
afternoon before easing up early this evening. High pressure will
be overhead early Thursday allowing for much lighter winds which
will favor a southwest direction away from the lake. Expect a lake
breeze to develop but it is not clear how far inland across il it
will make it before Thursday evening. Will keep it out of ord mdw
for now. Winds will likely flip to the southeast Thursday evening
but speeds will be light as this occurs. Otherwise,VFR will
prevail.

Mdb

Marine
259 am cdt
stout north winds today will gradually ease this afternoon and
then rapidly this evening. High waves and hazardous conditions
for small craft in the illinois and indiana nearshores will
continue into this evening. After brief southwest winds on
Thursday, another cold front will drop over the lake Thursday
night with a push of north winds to 30 kt behind it. Yet another
cold front will push through Friday night, though with weaker
northerly winds behind it. Southerly winds will settle in on
Sunday and be the rule into next week. Small craft advisory
conditions are likely in the illinois and indiana nearshores
during the days Monday-Wednesday with strong offshore winds.

Mtf

Lot watches warnings advisories
Il... None.

In... None.

Lm... Small craft advisory... Il nearshore waters until 10 pm
Wednesday.

Small craft advisory... In nearshore waters until 1 am Thursday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CNII2 11 mi30 min N 14 G 19 44°F 33°F
OKSI2 12 mi120 min N 12 G 16 42°F
FSTI2 13 mi120 min N 30 40°F
CHII2 - Chicago, IL 14 mi40 min N 17 G 18 40°F 35°F
JAKI2 14 mi120 min N 13 G 20 43°F
CMTI2 - 9087044 - Calumet, IL 17 mi42 min NNW 17 G 22 42°F 1019.8 hPa35°F
WHRI2 - Waukegan Harbor, IL 36 mi77 min NNE 24 G 25 41°F
BHRI3 - Burns Harbor, IN 38 mi39 min NNW 14 G 18 39°F 1020.3 hPa
MCYI3 - Michigan City, IN 49 mi40 min NNW 22 G 23 40°F 34°F

Wind History for Calumet Harbor, IL
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Last
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N9
G12
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G15
N7
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G9
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G11
N5
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N12
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N8
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G9
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N15
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G18
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N9
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N7
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NE6
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G17
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NW13
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NW15
G19

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago Midway Airport, IL5 mi67 minNNE 1310.00 miA Few Clouds53°F32°F45%1019.9 hPa
Chicago, Chicago-O'Hare International Airport, IL11 mi69 minNE 1410.00 miA Few Clouds51°F30°F45%1019.8 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi68 minNNE 15 G 2110.00 miFair50°F30°F46%1020.5 hPa
Lewis University Airport, IL22 mi85 minN 15 G 2010.00 miFair54°F32°F43%1019.3 hPa
Chicago / West Chicago, Dupage Airport, IL24 mi68 minNNE 810.00 miFair56°F33°F42%1019.1 hPa

Wind History from MDW (wind in knots)
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Last 24hrNE7N9NE7NE9N8NE8NE7NE8NE7N7N6N7N13
G19
N16N15
G25
N14N16N11
G21
N15
G20
N17N14
G23
N13NE14
G21
N13
1 day agoN11NE10NE11NE13N14N11NE10E9NE8NE5N3CalmNE4NE3N4E3NE4NE7NE5N4N5E10NE7N14
2 days agoE13NE14
G22
NE15NE14NE14NE13NE14NE13NE9NE8E8E7E5NE5E5NE7NE7NE7NE6NE8NE10NE10NE11NE12

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    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 (13,3,4,5)
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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.