Sunday, September24, 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 6:40AMSunset 6:45PM Sunday September 24, 2017 9:27 PM CDT (02:27 UTC) Moonrise 10:59AMMoonset 9:32PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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- 908 Pm Cdt Sun Sep 24 2017
Rest of tonight..Southeast winds 10 to 15 kt becoming south. Clear. Waves 1 to 2 ft.
Monday..South winds 5 to 10 kt becoming southeast 10 to 15 kt in the afternoon. Sunny. Waves 1 to 2 ft.
Monday night..Southeast winds 5 to 10 kt becoming south after midnight. Partly cloudy. Waves 1 ft or less.
Tuesday..Southwest winds 5 to 10 kt. Slight chance of showers in the afternoon. Waves 1 ft or less.
LMZ741 Expires:201709251045;;887287 FZUS53 KLOT 250208 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 908 PM CDT Sun Sep 24 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>742-251045-

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 242326
afdlot
area forecast discussion
national weather service chicago romeoville, il
626 pm cdt Sun sep 24 2017

Short term
Through Monday...

206 pm... Temps have reached the lower 90s at many locations this
afternoon with a lake breeze slowly moving inland in northeast il.

Similar to Saturday... Coolest temps behind the lake breeze likely
to be confined to right along the lakeshore. This lake breeze
will likely remain near the indiana lakeshore and not move too far
inland there. Dewpoints have dropped into the upper 50s in a few
locations and these slightly lower dewpoints will likely allow low
temps to drop into the lower 60s away from the city Monday
morning and a few upper 50s are also possible in the usual cool
spots. And while these lows will be a few degrees cooler than this
morning... There isn't as strong of a fog signal overnight. There
may still be some patchy shallow fog in the usual locations but
confidence is too low to include in the forecast for now.

Monday will be similar to today with temps warming quickly during
the morning and then leveling off in the upper 80s though its
possible some areas... Including the city starting warmer in the
morning... Will tag 90. A lake breeze is also expected... Keeping
the lake shore areas cooler. There should be more of a CU field
by early afternoon and some of the high res models are showing
isolated showers developing by late afternoon across northwest il
and the western cwa. Confidence is low regarding coverage and if
activity does develop... It may remain west of the CWA thus
maintained a dry forecast. Cms

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

late season heat lingers through Tuesday, before a pattern change
brings a transition to cooler weather by mid-week. Global models
are trending toward the development of a deep upper trough across
the western great lakes by the end of the week, which may result
in well below average temperatures for the region by next weekend.

Rain chances continue to appear fairly minimal through the
period.

Fairly strong mid-level low pressure will emerge from the western
conus long-wave trough early in the period, lifting northeast
across the northern plains and moving into ontario through
Wednesday. Persistent southerly flow will maintain very warm
conditions across the forecast area through Tuesday, in advance of
a slow-moving cold front which is progged to push across the area
Tuesday afternoon through Tuesday night. Low-level thermal ridge
progged with 925 mb temps in the +21 to +24c range across the cwa
would support afternoon high temps in the mid-upper 80's Tuesday
afternoon, with coolest areas northwest where cloud cover will
likely be greater. Best potential for showers thunderstorms would
appear to be across the west northwest parts of the forecast area
Tuesday afternoon, closer to the cold front during timing of more
favorable diurnal instability. Model QPF diminishes markedly
along the front further east Tuesday night, suggesting much of the
forecast area will not see significant rain before the front
exits the region.

Much cooler air then spreads into the area Wednesday behind the
front, as winds turn northwesterly, and cool dry advection takes
hold. Thermal gradient behind the front supports a range in temps
Wednesday from around 70 north to the mid-upper 70s far southeast,
and lows in the mid-upper 40s away from urban chicago Wednesday
night. Similar conditions persist Thursday, though perhaps a
degree or two cooler as dry high pressure spreads across the
region.

Guidance is in good agreement in digging another mid-level short
wave southeast into the trough across the area Thursday night,
with a cold front moving across the area early Friday morning. A
few showers are possible with the cold frontal passage early
Friday, though again the potential for significant rainfall
appears quite low. The 12z ECMWF and canadian depict a much
deeper trough closed low developing across the western central
lakes with this feature, while the operational GFS maintains a
more progressive open trough. A few GEFS ensemble members do
indicate more amplified solutions more along the lines of the
ec gem however, lending weight to the potential for a short-lived
stronger push of colder air Friday-Saturday. H8 temps around +4c
in both ec gem would likely support lake induced convective
showers over lake michigan and into northwest indiana late Friday
into early Saturday. Progressive trough moves quickly east of the
area late Saturday however, which should allow some moderation in
temps Sunday after cool high pressure moves through Saturday
night. For now, have coolest temps fri-sat with highs in the 60's
and lows in the lower 40's. Could potentially be chillier, in the
30s in some spots early Sunday morning depending on location of
surface ridge and good radiative cooling setup.

Ratzer

Aviation
For the 00z tafs...

other than some possible MVFR patchy ground fog during the
predawn hours Monday in the outlying areas (possibly affecting
dpa), look forVFR conditions through the period. Lake breeze will
probably result in wind shift at ord mdw gyy again Monday
afternoon, though given the background synoptic gradient flow, it
looks possible that the lake breeze passage may be a bit slower
than it was today, possibly as late as 23z at ord mdw.

- izzi

Marine
206 pm cdt
period of relatively quiet marine weather continues to start the
week, with modest south winds persisting through Tuesday. Low
pressure moves through the northern lakes Tuesday afternoon
however, and trails a cold front which pushes across lake michigan
Tuesday evening. Northwest winds behind the front will increase
to 20-25 kts for a time Wednesday into Wednesday night, eventually
becoming north and gradually diminishing early Thursday. The long
north-northwest fetch and push of much cooler air across the warm
lake waters will build waves especially on the southern part of
the lake, which will likely eventually require small craft
advisory headlines.

Winds quickly turn back to the south and increase by late Thursday
as another low and cold front approach from the northwest.

Stronger northerly winds approaching 30 kts are expected by
Friday, gradually easing into Saturday before high pressure builds
in Saturday night.

Ratzer

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 mi27 min 74°F
OKSI2 12 mi87 min ESE 4.1 81°F
FSTI2 13 mi87 min SE 9.9 76°F
JAKI2 14 mi87 min SSE 1.9 76°F
CHII2 - Chicago, IL 14 mi57 min E 13 G 14 78°F 67°F
CMTI2 - 9087044 - Calumet, IL 17 mi39 min ESE 2.9 G 5.1 76°F 1015.9 hPa70°F
45174 22 mi17 min E 7.8 G 9.7 75°F 72°F1 ft70°F
WHRI2 - Waukegan Harbor, IL 36 mi47 min SSW 7 G 8.9 76°F
BHRI3 - Burns Harbor, IN 38 mi47 min SSE 7 G 8.9 84°F 1016.9 hPa
45170 46 mi17 min SE 5.8 G 5.8 76°F 73°F67°F
MCYI3 - Michigan City, IN 49 mi37 min ESE 5.1 G 6 79°F 57°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 mi34 minESE 410.00 miA Few Clouds80°F62°F54%1015.2 hPa
Chicago, Chicago-O'Hare International Airport, IL11 mi36 minESE 510.00 miA Few Clouds80°F59°F49%1015.8 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi35 minN 010.00 miFair77°F62°F60%1016.4 hPa
Lewis University Airport, IL22 mi52 minSSE 410.00 miFair78°F60°F56%1016.3 hPa
Chicago / West Chicago, Dupage Airport, IL24 mi35 minESE 49.00 miFair76°F62°F62%1015.7 hPa

Wind History from MDW (wind in knots)
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Last 24hrE5E3E4SE5SE5SE4SE3S3S3S4S5S5SW5SW4SW6S10
G15
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1 day agoSE7SE5SE3S6SW3CalmCalmS4S4S5S4S4SW3S43E4SE3E11E12E11E10E7E6E6
2 days agoSE3S6S7S6S7S6S4SW4SW5S5S6S5SW7SW7SW5SW11
G15
SW9SW3S7S9S6S6SE7E8

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 (22,6,7,8)
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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.