Saturday, April21, 2018 L-36.com


Marine Weather and Tides
Chicago, 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 5:58AMSunset 7:40PM Saturday April 21, 2018 6:06 PM CDT (23:06 UTC) Moonrise 10:38AMMoonset 12:49AM Illumination 41% Phase: Waxing Crescent; Moon at 7 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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LMZ742 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 253 Pm Cdt Sat Apr 21 2018
Tonight..Northeast winds 5 to 10 kt. Mostly cloudy in the evening then becoming partly cloudy overnight. Waves 1 ft or less.
Sunday..Northeast winds 10 to 15 kt increasing to 10 to 20 kt in the afternoon. Mostly Sunny. Waves 1 ft or less building to 1 to 3 ft in the afternoon.
Sunday night..Northeast winds 10 to 15 kt. Partly cloudy. Waves 1 to 3 ft.
Monday..Northeast winds 10 to 15 kt. Mostly Sunny. Waves 1 to 3 ft.
LMZ742 Expires:201804220330;;296366 FZUS53 KLOT 211953 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 253 PM CDT Sat Apr 21 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>742-220330-

7 Day Forecast for Marine Location Near Chicago, IL
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location: 41.85, -87.6     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 212300
afdlot
area forecast discussion
national weather service chicago romeoville, il
600 pm cdt Sat apr 21 2018

Short term
211 pm cdt
tonight through Sunday...

a narrow axis of light rain sprinkles persists this afternoon, in
association with a weak mid-level short wave traversing an
elevated baroclinic zone which stretches from northeast ia through
northwest in. While light low level easterly flow continues to
supply relatively dry air near the surface, forcing aloft induced
by frontogenesis in the 925-850 mb layer and co-located beneath
the divergent right entrance region of an upper jet streak over
the northern lakes, was persistent enough to produce precip at the
surface. High-res guidance continues to indicate an overall
weakening trend and diminishing coverage along this axis through
late afternoon, though have adjusted to carry light rain and
sprinkles at least in isolated to scattered fashion through late
afternoon for the rockford-chicago area. Skies are expected to
remain mostly cloudy into tonight, especially across the southern
parts of the forecast area, while far northeast il may see some
decrease in cloud cover overnight. Coolest overnight lows, in the
mid 30's, should be across the far north northeast parts of the
cwa where less cloud cover is likely, with temps in the upper 30's
to around 40 in the south.

On Sunday, the closed upper low drifting slowly east across the
plains is progged to track into the lower middle mississippi
valley, with surface low pressure nearing memphis tn by evening.

The surface pressure gradient tightens a bit during the day
between this low and the lingering high pressure ridge over the
great lakes, increasing easterly winds a bit across the local
area. While keeping dry low level air in place across the area, it
will also result in another day of cooling off the lakes, with
temps in the 40's once again along the lake michigan shore. A
little more sunshine filtering through high level cloud cover
combined with weak warm advection aloft is expected to allow temps
in the upper 50's to lower 60's farther inland however.

Precipitation is expected to remain well south of the cwa, mainly
south of the i-72 i-70 corridors across downstate il in.

Ratzer

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

while conditions will continue to be mild across inland areas
early in the week, an upper low is expected to track eastward from
the ozarks Sunday night towards the ohio valley by Tuesday night.

While it appears that much of the precipitation with this system
will remain south and east of the area, I cant rule out a few
light rain showers from time to time over portions of the area
late Monday into Tuesday. For this reason, I am maintaining some
slight chances for precipitation during this time. Otherwise,
expect temperatures to continue to be fairly warm for inland
areas. High temperatures look to be in the lower to mid 60s,
especially on Monday. Only slightly cooler temperatures are
expected on Tuesday due to more cloud cover and some possible
showers as a cold front moves across the area. For areas closer
to the lake michigan shores, expect much cooler conditions (40s to
near 50 degrees) both days due to continued onshore flow.

A ridge of surface high pressure is forecast to build
southeastward from the upper midwest Tuesday night into the mid-
mississippi valley and lower great lakes region for midweek. This
should result in a dry day or two Wednesday into Thursday before
our next weather maker takes aim on the area by late Thursday or
Thursday night. While forecast guidance is still not in agreement
on the exact timing of this system, there is a strong signal for
a decent mid-level disturbance to dig southeastward over the
western great lakes later in the week. The main impacts of this
system would be increasing chances for a period of showers in
association with the approach of a surface cold front late
Thursday. It also appears that a period of cooler weather will set
up over the area for Friday, before temperatures quickly moderate
next weekend.

Kjb

Aviation
For the 00z tafs...

taf fully convey expected conditions with weather expected to
result in little or no impact to aviation operations.

- izzi

Marine
246 pm cdt
continued quiet weather over lake michigan through late Monday
with high pressure prevailing. Overall, this will result in mainly
light and variable winds. An area of low pressure is expected to
track over the southeastern CONUS on into Tuesday as another area
of high pressure begins to build southeastward into the upper
midwest. This should produce more of a north-northeasterly wind
component over the lake at times through midweek. The strongest
period of northerly winds currently looks to be late Tuesday night
through and Wednesday following a cold frontal passage. Winds up
around 30 kt look probable during this period, and this may result
in small craft advisory conditions for the southern lake michigan
near shore waters.

Kjb

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
CNII2 1 mi37 min NNE 2.9 G 7 43°F 32°F
OKSI2 4 mi127 min ENE 1.9 G 2.9 42°F
CHII2 - Chicago, IL 5 mi47 min N 2.9 G 4.1 40°F 35°F
JAKI2 5 mi127 min NE 5.1 G 6 42°F
FSTI2 9 mi127 min ENE 8.9 40°F
CMTI2 - 9087044 - Calumet, IL 9 mi49 min NNE 7 G 7 42°F 1028 hPa33°F
BHRI3 - Burns Harbor, IN 28 mi55 min ENE 6 G 7 43°F 1029.1 hPa
WHRI2 - Waukegan Harbor, IL 37 mi87 min ENE 2.9 G 5.1 40°F
MCYI3 - Michigan City, IN 37 mi47 min NNE 5.1 G 5.1 42°F 31°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago Midway Airport, IL9 mi74 minE 910.00 miMostly Cloudy53°F23°F31%1028.9 hPa
Chicago, Chicago-O'Hare International Airport, IL18 mi76 minE 810.00 miOvercast54°F23°F30%1028.4 hPa
Gary Regional Airport, IN19 mi82 minN 010.00 miOvercast46°F30°F53%1029.5 hPa
Lansing Municipal Airport, IL22 mi72 minENE 710.00 miFair51°F31°F48%1028.8 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL24 mi75 minE 710.00 miOvercast51°F19°F28%1029.4 hPa

Wind History from MDW (wind in knots)
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Last 24hrE9E6E4E4E4E4E5E4E4E3E3CalmE5E4CalmCalmCalmCalmNE8E4NE4NE8E9E8
1 day agoN9NE8N5NW6NW7W3CalmCalmCalmW3CalmCalmCalmNE5CalmSE3CalmCalmE8NE8NE10E12E10E13
2 days agoN7NW5NW9NW8NW10NW10NW9N7N10N9N10N10N11N10N10N10N10N11N11N10NE12NE11N9NE8

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 (19,4,5,8)
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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.