Monday, September16, 2019 L-36.com


Marine Weather and Tides
Evanston, IL

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:30AMSunset 7:00PM Monday September 16, 2019 2:06 AM CDT (07:06 UTC) Moonrise 8:31PMMoonset 8:39AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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 Expires:201909161030;;855837 Fzus53 Klot 160247 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 947 Pm Cdt Sun Sep 15 2019 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>742-161030- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 947 Pm Cdt Sun Sep 15 2019
Rest of tonight..Variable winds around 10 kt becoming north 10 to 15 kt late. Areas of fog. Waves around 1 ft.
Monday..North winds 10 to 20 kt. Areas of fog in the morning. Waves 2 to 4 ft.
Monday night..Northeast winds 5 to 10 kt becoming east after midnight. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 to 3 ft.
Tuesday..Southeast winds 5 to 10 kt. Partly Sunny. Waves 1 ft or less.
LMZ741


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 160553
afdlot
area forecast discussion
national weather service chicago romeoville, il
1253 am cdt Mon sep 16 2019

Update
910 pm cdt
main update this evening was to issue a dense fog advisory for
portions of north central il for later tonight into Monday
morning. In the near term, area of scattered light rain showers
which moved through earlier this evening has diminished with dry
conditions now in place. Despite a boundary lingering across
northern il, large scale support is really lacking and expect dry
conditions for the remainder of the night.

Turn attention to the likely fog development tonight, with once
again, a dense fog advisory in place for portions of north central
il. Very moist conditions in place with high dewpoint air
overhead, on both sides of this front with upper 60s to low 70s
dewpoints in place over much of the region. Additionally, several
rounds of heavier rainfall across the area has added to this
moisture content. With a relaxed gradient overhead and with skies
expected to clear tonight, setup will favor fog development across
the cwa. Fog will likely be observed areawide tonight, but do have
some higher confidence at this time for more dense fog
development across northern il where the higher moisture is
situated. These factors and the fact that dense fog has already
developed across parts of southwest wi where the skies have
cleared, has provided higher confidence for dense fog. Locations
within the advisory may have a couple of more hours until dense
fog develops, especially as stratus still remains in place.

However, this fog should really begin to develop around the
midnight time frame. Remaining areas outside of the advisory in
northern il and even northwest in once again will also likely
observe fog, and possibly dense fog, later tonight into early
Monday morning. This will be closely monitored, with expansion of
this advisory appearing probable later tonight.

Rodriguez

Short term
254 pm cdt
tonight...

main questions, with the passage of a weak cold front tonight,
are additional precip chances and the development of fog in the
moist and stable airmass left behind from earlier widespread
rainfall. Given the lack of upstream development so far today,
the diffuse nature of the front, the low level inversion evident
in the latest aircraft soundings, and the meager upper level
support, chances for additional showers and thunderstorms appear
to drop considerably after this evening. These factors also
support the idea of fog development, mainly toward late evening
and the early overnight hours. There is a chance that slightly
better mixing with the frontal passage might support stratus
rather than fog toward morning, but will maintain a mention of at
least patchy to areas of fog for most of the overnight period.

Lows tonight, with the considerable cloud cover, should remain in
the middle 60s in many locations, cooler north and warmer south,
but relatively mild for mid september.

Lenning

Long term
201 pm cdt
Monday through Sunday...

any lingering patchy dense fog Monday morning should readily scatter
out into a low stratus deck through the mid-morning. Low-level
moisture will likely remain trapped under a stout subsidence
inversion through Monday morning and possibly even into the
afternoon hours, especially in the vicinity of the lake front. As a
result, opted to knock high temperatures down quite a bit in the
post-frontal airmass for Monday afternoon. It looks like highs may
struggle to make much progress into the lower 70s near the lake
shore, while mid and upper 70s (possibly lower 80s) become more
prevalent the farther inland you go.

Light winds will prevail Monday night into Tuesday as high pressure
begins to scoot off to our north and east. Dewpoints in the lower
60s, coupled with some increase in high cloud cover through the
night should limit our ability to effectively radiate overnight, and
this will probably keep temperatures from tanking. Still, we'll
probably see some upper 50s in our typical cooler spots. Patchy fog
will once again be possible, but the combination of a decent breeze
immediately off the deck and the aforementioned high cloud cover may
help curtail the potential for widespread dense fog issues.

The more quiescent stretch of weather looks to continue through the
middle of the week, although some low-grade chances may work their
way into portions of the region by Wednesday night Thursday as the
next set of shortwaves eject out of the cyclonic flow across the
great basin and towards the international border. Forcing for ascent
from these next waves look to remain displaced well to our north and
west, so we'll cap pops at 20-30 percent for the time being. Some
upper impulses may start to inch a bit closer to our neck of the
woods by the end of the week and into the upcoming weekend, which
may bring somewhat better chances for precipitation and unsettled
conditions back to the area.

Carlaw

Aviation
For the 06z tafs...

cig and vis conditions are expected to deteriorate through daybreak
as fog develops. A rather persistent MVFR stratus deck is slowly
moving SE across northern il, and will delay the onset of lower
visibility for a couple hours at the chicago metro terminals.

However, once the stratus exits the area, CIGS and vis should
quickly drop. This is expected to begin shortly at rfd with the back
edge of the stratus currently near the terminal. Low-end ifr vis and
cigs appear likely area-wide, with lifr conditions at rfd dpa gyy.

At ord mdw, effects from the urban heat island may be enough to keep
conditions ifr, but there is a possibility for lifr conditions. If
this were to occur, the most likely time frame will be 10-13z.

Cigs and vis will only slowly rise through the morning, eventually
becoming sct MVFR for the afternoon. Another round of fog is
possible tonight, but the pattern suggests higher vis.

Kluber

Lot watches warnings advisories
Il... Dense fog advisory... Ilz003-ilz004-ilz008-ilz010-ilz011 until 10
am Monday.

In... None.

Lm... None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
45174 7 mi27 min WNW 1.9 G 3.9 64°F1014.1 hPa
CHII2 - Chicago, IL 10 mi37 min NNW 7 G 8 71°F 71°F
CNII2 13 mi37 min WNW 2.9 G 6 71°F 66°F
JAKI2 18 mi127 min W 1.9 G 1.9 71°F
CMTI2 - 9087044 - Calumet, IL 22 mi49 min SW 1.9 G 2.9 70°F 1016.3 hPa68°F
45186 24 mi27 min WSW 1.9 G 3.9 67°F 64°F
BHRI3 - Burns Harbor, IN 39 mi87 min SSW 2.9 G 2.9 71°F 1017.3 hPa
KNSW3 - Kenosha, WI 39 mi67 min WNW 6 G 7 69°F 1016.9 hPa (+0.3)
45170 43 mi27 min SW 3.9 G 3.9 69°F 68°F67°F
MCYI3 - Michigan City, IN 46 mi37 min SSW 6 G 6 71°F 66°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 mi15 minNW 310.00 miOvercast72°F68°F87%1017.2 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi2.3 hrsN 08.00 miA Few Clouds71°F70°F96%1016.2 hPa
Chicago, Chicago Midway Airport, IL17 mi74 minN 010.00 miA Few Clouds72°F69°F91%1016 hPa

Link to 5 minute data for KPWK

Wind History from PWK (wind in knots)
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Last 24hrS9S7SW9S8S10S9S9SW9
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SW5SW6S4SW6W4N4CalmCalmCalmN3NW3
1 day agoSW4SW4CalmCalmCalmSW33SW6S44SW9W8W9SW8SW11SW5S5SE4S3CalmS6S9S11S10
2 days agoE3CalmS8S8SW3SW5SW9SW6SW10SW12
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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.
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Wind Forecast for Chicago, IL (3,6,7,8)
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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.