Sunday, July23, 2017 L-36.com


Marine Weather and Tides
North Riverside, 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 5:35AMSunset 8:19PM Sunday July 23, 2017 1:53 AM CDT (06:53 UTC) Moonrise 5:52AMMoonset 8:33PM 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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LMZ741 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 907 Pm Cdt Sat Jul 22 2017
Rest of tonight..East winds around 5 kt becoming west toward daybreak. Mostly cloudy. Waves 1 ft or less.
Sunday..Northwest winds 10 to 15 kt. Slight chance of showers and Thunderstorms in the afternoon. Waves 1 ft or less.
Sunday night..North winds 10 to 20 kt. Slight chance of showers and Thunderstorms in the evening. Waves 1 ft or less building to 2 to 4 ft after midnight.
Monday..North winds 15 to 20 kt. Partly Sunny. Waves 3 to 4 ft.
LMZ741 Expires:201707231030;;677793 FZUS53 KLOT 230207 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 907 PM CDT Sat Jul 22 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>742-231030-

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 230645
afdlot
area forecast discussion
national weather service chicago romeoville, il
145 am cdt Sun jul 23 2017

Short term
150 pm cdt
through Sunday...

quieter weather is in place with surface high pressure overhead.

The surface boundary is anchored along our southern counties.

Southerly flow ahead of the boundary and some cloud breaks should
lead to destabilization across the area. Hi resolution guidance
does still attempt to break out some convective activity in the
waa atop this boundary but it would fairly limited in coverage at
least in our area and more likely confined across central and
southern il in. Dcape and high pwats suggest a wind and heavy rain
threat.

A fairly broad mid-upper level trough will push southeast through
the great lakes on Sunday. Ahead of this trough, convection is
expected across the upper midwest this evening, with the majority
shorter term guidance weakening this activity as it nears il,
though some sprinkles or isolated showers would not be unheard of.

The associated cold front will pass through the area during the
morning into early afternoon. Convective coverage is still a bit
uncertain at this time, given the main upper forcing is north in
the less unstable air, and the cold front will largely be through
a good portion of the area in the afternoon. Some convection
remains plausible both north and ahead of the wave, so held onto
some lower chances at this time. Areas east and south stand the
best chance for isolated severe storms later in the day. Generally
speaking most times will be dry, and it will be at least a little
less muggy with dewpoints in the 60s instead of 70s.

Kmd

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

looking at a cooler and drier upcoming week.

An upper level wave swings overhead Sunday, and we may have
lingering showers and storms mainly along and east of i-55 Sunday
night.

Northerly winds set up Monday bringing in cooler and less humid air.

Highs Monday are forecast to be in the low 70s along the lake to
around 80 south of i-80. High pressure moves over the lake Monday
night leading to dry conditions through Wednesday morning.

Temperatures slowly climb back into the mid to upper 80s by
Wednesday.

The next chance of precip arrives Wednesday afternoon and evening in
advance of a weak low and cold front. Showers and storms linger into
Thursday. Cooler air moves in behind the cold front with highs in
the low 80s away from the lake Thursday. Another high moves over
the midwest late next week.

Jee

Aviation
For the 06z tafs...

very light winds overnight into the predawn hours should
eventually take on a west to northwesterly component toward
daybreak and into the morning, then very gradually move toward
a northerly direction by evening. Development of a lake breeze
also is a good possibility with such a weak pressure gradient,
but it is not clear if this would push all the way to the
terminals. The other concern would be development of isolated to
scattered convection during the late morning to early afternoon
hours as the forcing for existing activity across wi moves toward
the area. Considered adding a vcts but elected to wait for
additional information given the present degree of low confidence
on timing and extent of this activity.

Lenning

Marine
145 am cdt
broad low pressure and an associated diffuse and mainly light wind
field will prevail over the lake this morning. Isolated showers or
storms may continue over the lake during today associated with
this low. As the low pressure shifts southeast, an associated cold
front will progress south this afternoon and evening, turning
winds from westerly to northerly. This front wind shift should
reach the far southern tip of the lake by midnight.

On Monday, the northerly winds look to occasionally gust over 20
kt over the open water and southern nearshores. This fetch will
build waves to at least close (3-5 ft) to small craft advisory
criteria in the illinois and indiana nearshore beaches late
tonight and throughout Monday.

The next similar oriented cold front will move southward across
the lake on or near Wednesday evening. This could have some gusty
storms in advance of and along its passage. Behind the passage,
another tight pressure gradient looks to drive northerly winds and
potential small craft advisory criteria waves, and maybe even
winds, for illinois and indiana on Thursday.

Mtf

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 11 mi24 min 72°F
45177 12 mi174 min 74°F
OKSI2 12 mi174 min ESE 1.9 76°F
FSTI2 13 mi174 min SSE 2.9 73°F
JAKI2 14 mi114 min S 1 74°F
CHII2 - Chicago, IL 14 mi34 min S 6 G 7 74°F 72°F
CMTI2 - 9087044 - Calumet, IL 17 mi54 min SSE 2.9 G 2.9 74°F 1008.7 hPa (-1.0)72°F
45174 22 mi34 min SSW 1.9 G 3.9 72°F 73°F72°F
WHRI2 - Waukegan Harbor, IL 36 mi74 min SSW 4.1 G 5.1 72°F
BHRI3 - Burns Harbor, IN 38 mi52 min SSE 2.9 G 8 75°F 1009.5 hPa
45170 46 mi34 min S 3.9 G 5.8 73°F 75°F71°F
MCYI3 - Michigan City, IN 49 mi34 min SE 4.1 G 4.1 73°F 69°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago Midway Airport, IL5 mi61 minSSE 410.00 miA Few Clouds75°F70°F84%1007.8 hPa
Chicago, Chicago-O'Hare International Airport, IL11 mi63 minSSE 310.00 miA Few Clouds73°F69°F87%1008.3 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi62 minN 010.00 miFair74°F72°F94%1008.9 hPa
Lewis University Airport, IL22 mi79 minESE 510.00 miFair73°F68°F85%1009.1 hPa
Chicago / West Chicago, Dupage Airport, IL24 mi62 minN 07.00 miFair72°F71°F97%1008.7 hPa

Wind History from MDW (wind in knots)
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Last 24hrSW6E5W8SW13S13
G20
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G23
E5NW6NW75W5NW6NW9NW73E10E7E5NE5E5E5E4S4
1 day agoCalmS5CalmW4N4NE6E6S6S54S7SE76S8S7S9NE12E11E10E6E5SE6S10S9
2 days agoS7S6SW6W3CalmNE5N6S11S11
G19
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G23
W15
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SW12W12NW10E10E7E6E9E7NE5E5E5NE5

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 (2,6,7,8)
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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.