Tuesday, January16, 2018 L-36.com


Marine Weather and Tides
Evanston, 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 7:13AMSunset 4:47PM Tuesday January 16, 2018 7:29 PM CST (01:29 UTC) Moonrise 7:50AMMoonset 5:38PM Illumination 0% Phase: New Moon; Moon at 0 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- 306 Pm Cst Tue Jan 16 2018
.small craft advisory in effect from Wednesday afternoon through Thursday afternoon...
Tonight..West winds 10 to 20 kt. Partly cloudy. Waves 1 to 3 ft subsiding to 1 to 2 ft.
Wednesday..Southwest winds 15 to 25 kt increasing to 30 kt. Mostly Sunny. Waves 1 to 2 ft.
Wednesday night..Southwest winds to 30 kt. Mostly clear. Waves 1 to 3 ft.
Thursday..Southwest winds 20 to 25 kt diminishing to 10 to 20 kt. Sunny. Waves 1 ft 1 to 2 ft.
LMZ741 Expires:201801170415;;550809 FZUS53 KLOT 162106 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 306 PM CST Tue Jan 16 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>742-170415-

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 162338
afdlot
area forecast discussion
national weather service chicago romeoville, il
538 pm cst Tue jan 16 2018

Short term
247 pm cst
through Wednesday...

for the remainder in the afternoon and into early evening, the main
concern will continue to be the lake effect snowfall over nwrn
indiana.

Latest radar trends indicate that the lake effect plume that had
developed earlier today over southern lake michigan is slowly, but
steadily moving east across nwrn il and SRN lake michigan. The back
edge of the snow is along the lake porter county line and snow has
ended over nern illinois and lake and newton counties in nwrn
indiana. There is still the potential for moderate to heavy lake
effect snow, mainly over porter county, with some lighter snow
extending into NRN jasper county. Northern lake county could
possibly see an additional 2 to 3 inches of snow through earlier
this evening. The higher of these amounts should be over portions
of the county that have not yet seen the heavier snow just yet and
snowfall rates of 1 to 2 inches per hour are possible. While the
winter weather advisory has been allowed to expire over lake and
cook counties in illinois, the advisory for lake and porter
counties in indiana will continue.

Through the evening and into the overnight hours, high pressure over
the upper missouri valley will slide to the southeast, and will be
centered over the lower ohio valley by Wednesday morning. Winds
across the region will gradually back from nwly to swly, shutting
off the lake effect snow potential through the evening. Under
decreasing cloud cover, diminishing winds and fresh snowfall,
temperatures should drop into the single digits above 0 f overnight.

With winds arnd 5 to 10 mph, wind chill readings should drop to -10
to -15 f overnight.

Winds will strengthen again through the day tomorrow as the center
of the strong high remains parked over the lower ohio valley and low
pressure tracks across south-central canada. With a strengthening
pressure gradient, swly winds should gust to 25 mph by late morning,
with some gusts possibly up to 30 mph in the afternoon. The upper
level pattern is expected to remain high amplitude and slowly
progressive, with deep long-wave upper troughing slowly moving east
of the region while upper ridging remains over the rockies. With
deep layer cold advect and nly flow aloft, temperatures tomorrow
should remain in the upper teens to lower 20s.

Long term
207 pm cst
Wednesday night through Tuesday...

pleasant conditions and moderating temps will be the rule for late
week before precipitation chances arrive over the weekend. The
upper trough that brought the current cold snap to the area will
be departing to the east with upper ridging across much of the
western u.S. Spreading eastward. Low mid level temps will rebound
as the ridge moves eastward allowing for a noticeably milder day
for Thursday as highs warm into the lower 30s. A shortwave will
traverse the ridge Thursday but have little influence on our
weather. Once the wave passes, the ridge broadens allowing warmer
air to push toward the region. The snow pack will likely have some
influence on temps by Friday. Dewpoints will also increase Friday
which will bring the potential for some fog development,
especially Friday night. Saturday may be the more likely day for
fog development as a bigger push of moisture arrives but some
erosion of the snow pack will have occurred by then, though it may
be minimal overall. A deep upper trough will be moving across the
southwest u.S. Into Saturday then lift northeast into the central
and southern plains by Sunday. A surface low will track northeast
from the southern plains with guidance pretty consistent on taking
the low north of the local area. Given this is a ways off, details
are subject to change but would expect to see precipitation
chances increase later Saturday or early Sunday as a warm frontal
boundary develops near or over the area. Mixed precip may be a
possibility, especially across northern areas, Saturday night
before transitioning to all rain. Temps still look to surge into
the 40s or lower 50s for Sunday. The surface low and upper trough
pass Monday which would likely bring a change to snow as mid and
upper levels cool. Cooler air will move in with medium range
guidance differing somewhat on the magnitude.

Mdb

Aviation
For the 00z tafs...

538 pm... Only forecast concern this period are the winds. Lake
effect snow showers have shifted mainly east of gyy. Lake effect
MVFR clouds will still be possible for a few hours at gyy along
with some passing flurries or a brief snow shower. Northwest winds
will slowly diminish under 10kts this evening and turn southwest
by mid morning Wednesday. The gradient will slowly tighten and as
the low levels mix... Speeds gusts will slowly increase during the
afternoon and continue into Wednesday evening. Cms

Marine
247 pm cst
an active period of weather is setting up for lake michigan.

As high pressure settles into the lower ohio valley tomorrow morning
and low pressure tracks across south-central canada, winds over the
lake will back from generally northerly to southwesterly tomorrow.

With the high expected to very slowly sag south toward the northern
gulf of mexico and a series of low pressure systems track across
south-central canada and the upper great lakes, winds are expected
to increase to gale force by early Wednesday morning. The surface
pressure pattern is expected to change little from Wednesday morning
through Thursday morning, so an extended period of gales is
possible, with winds initially reaching gale force over the northern
portions of the lake Wednesday morning, and then strengthening to
gale force over the southern portions of the lake in the afternoon.

The gradient over the lake is expected to weaken through the day on
Thursday, with winds diminishing below gale force from north to
south through the day. With wind direction expected to be
southwesterly, winds may not reach gale force over the nearshore
waters, so, have gone with a small craft advisory for the nearshore
waters and a gale watch for the open waters. The gale watch will
likely be replace with a gale warning as exact timing becomes a bit
more certain.

Another low will track across the canadian prairies over the
weekend, bringing another potential period of gales Friday night
into Saturday. The longer range guidance continue to advertise a
deepening low developing over the south high plains on Sunday and
lifting through the middle mississippi valley on Monday and
continuing across the northern portions of the lake Monday night.

Another round of southwest gales is possible in advance of the
system, but the extent of any potential gales will depend on the
exact track of the system, which is still somewhat uncertain at this
time.

Lot watches warnings advisories
Il... None.

In... Winter weather advisory... Inz001 until 9 pm Tuesday.

Winter weather advisory... Inz002 until midnight Wednesday.

Lm... Small craft advisory... Lmz740-lmz741-lmz742-lmz743-lmz744-
lmz745... 1 pm Wednesday to 4 pm Thursday.

Gale watch... Lmz777-lmz779... 1 pm Wednesday to 3 pm Thursday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FSTI2 4 mi90 min NNW 8.9 20°F
OKSI2 9 mi90 min NNW 5.1 23°F
CHII2 - Chicago, IL 10 mi40 min NW 15 G 18 23°F 13°F
CNII2 13 mi30 min W 9.9 G 14 21°F 11°F
JAKI2 18 mi90 min WNW 6 22°F
CMTI2 - 9087044 - Calumet, IL 22 mi42 min W 8.9 G 13 21°F 1032.2 hPa11°F
WHRI2 - Waukegan Harbor, IL 24 mi50 min NW 9.9 G 14 18°F
KNSW3 - Kenosha, WI 39 mi30 min WNW 8 G 11 17°F 1033.2 hPa (+1.4)
BHRI3 - Burns Harbor, IN 39 mi50 min NW 17 G 28 22°F 1032.2 hPa
MCYI3 - Michigan City, IN 46 mi40 min SSE 7 G 8.9

Wind History for Calumet Harbor, IL
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G18

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL12 mi38 minNW 710.00 miFair18°F10°F71%1034.9 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi39 minNW 1010.00 miA Few Clouds18°F9°F68%1034.3 hPa
Chicago, Chicago Midway Airport, IL17 mi37 minNW 810.00 miA Few Clouds20°F10°F65%1035.4 hPa

Wind History from PWK (wind in knots)
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Last 24hrW8SW7W6W7W8W10W6W5W4W6NW8NW8NW9NW9NW14NW12NW15N10N8NW10NW9NW9NW6NW7
1 day agoS11S12S12S12S15S11S11S12S10S9S10S7S7S7S6S7S5SW5SW11SW8W7W9W11W7
2 days agoNW4NW3NW3CalmW3CalmCalmCalmCalmCalmCalmCalmCalmSW7SW10S10SW10S9S9S10S12S14
G20
S12S13

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
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Chicago, IL (20,4,5,8)
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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.