Sunday, March26, 2017 L-36.com


Marine Weather and Tides
Evanston, IL

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:40AMSunset 7:12PM Sunday March 26, 2017 4:17 AM CDT (09:17 UTC) Moonrise 6:04AMMoonset 5:43PM Illumination 2% Phase: Waning Crescent; Moon at 28 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- 350 Am Cdt Sun Mar 26 2017
.dense fog advisory in effect until 1 pm cdt this afternoon...
.small craft advisory in effect through this afternoon...
Today..East winds 10 to 20 kt becoming southeast this morning...then becoming southwest 10 to 15 kt late in the afternoon. Dense fog through the day. Slight chance of Thunderstorms in the morning. Rain showers likely through the day. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft in the afternoon.
Tonight..Southwest winds 10 to 15 kt becoming west 5 to 10 kt after midnight. Slight chance of showers in the evening. Patchy fog through the night. Waves 1 to 3 ft subsiding to around 1 ft after midnight.
Monday..Northeast winds 10 to 15 kt. Chance of rain. Waves around 1 ft building to 1 to 3 ft in the afternoon.
Monday night..North winds 15 to 20 kt. Chance of rain. Waves 2 to 4 ft building to 3 to 5 ft occasionally to 7 ft after midnight.
LMZ741 Expires:201703261530;;097537 FZUS53 KLOT 260850 NSHLOT NEARSHORE MARINE FORECAST NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 350 AM CDT SUN MAR 26 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>742-261530-

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 260913
afdlot
area forecast discussion
national weather service chicago/romeoville, il
413 am cdt Sun mar 26 2017

Short term
245 am cdt
through tonight...

another day of showers on tap for northern illinois and northwest
indiana, with precipitation finally winding down late this
afternoon into the evening.

Slow moving upper low is crossing the mississippi river early this
morning near far northeastern missouri and the 500mb circulation
is expected to lift across the chicagoland area mid afternoon.

Meanwhile, at the surface, a frontal boundary is draped from pnt
to rzl early this morning and expected to lift north to near the
il/wi state line this afternoon. This will allow warmer air to
overspread most of the CWA with afternoon highs expected to be in
the low 60s. Southwest winds behind the front should bring the
warmer temps all the way to the lake front. NAM guidance indicates
the front may stall over the northern tier of counties which
would result in a temperatures staying cooler for areas within
several miles of the state line, but as of now the NAM is a
southerly outlier.

Isentropic ascent continues to be fairly broad across the cwa
today but there is better pressure packing that lifts across the
area between 12z and 18z today which coincides with a lobe of
dcva that lifts across the eastern half of the cwa. Instability
has shifted farther east today, and is mainly over the northwest
indiana counties which will limit the thunder threat for illinois.

With this in mind, have the highest pops and expected the
greatest precipitation coverage east of the i-55 corridor today
with more spotty activity expected to the west. Precipitation
chances should wind down from the west this afternoon as the 500mb
low/trough axis moves to lake michigan mid afternoon then to
southwestern michigan early this evening.

Fog may be an issue throughout the day within the lighter flow of
the frontal trough with some improvement expected as southwest
flow increases from the south today. Overnight, a trailing surface
trough and eventually a col area will move over the CWA which
will continue to provide light winds. Expect cloud cover to stay
locked in so we won't radiate very well, but the combination of
high dewpoints and light flow will promote fog redevelopment
overnight.

Deubelbeiss

Long term
245 am cdt
Monday through Saturday...

upper low that provided wet conditions over the weekend is progged
to open up and shift to new england early next week with a brief
lull in precipitation first half of Monday as a transient upper
ridge builds across the midwest. Meanwhile, water vapor imagery
this morning indicates another upper level disturbance over the
desert southwest which will eventually lift across the plains and
midwest through the day Monday. A modest surface reflection will
move from oklahoma late tonight to central/downstate illinois
Monday afternoon with precipitation overspreading the cwa
associated with a corridor of mid level WAA out ahead of the low.

Soundings indicate fairly shallow moisture this far north with
weak instability only clipping areas east of the i-57 corridor.

This system will quickly depart to our east Monday night with high
pressure building from the canadian prairies across portions of
the upper midwest Tuesday and Wednesday. Expect dry conditions
during this timeframe but north to northeast winds will suppress
temperatures near the lake front, keeping those areas in the low
to mid 40s while farther inland temperatures warm into the 50s.

Models continue to struggle handling track and timing of low
pressure late in the week. The GFS has a southerly track that
keeps some of the local area dry late in the week while the ecmwf
and gem lift the low across portions of the midwest which would
result in showers and possibly thunderstorms locally. While the
details are still way out of focus at this distance, the gem and
ecmwf have been more consistent over the past few days and will
lean on those solutions with at least high chance pops late in the
week.

Deubelbeiss

Aviation
For the 06z tafs...

main forecast concerns continue to be centered on low ceilings and
reduced vis due to rain/drizzle/fog.

Large upper level system will continue to be slow to move through
the region, with periodic rain or drizzle to continue moving
across the sites. This will likely persist through late this
afternoon, with a drying trend finally likely into the evening.

Ceilings had varied across the sites overnight, but ifr/lifr
ceilings are moving back overhead. Initial ifr in the near term
will be replaced with lifr ceilings soon there after. For mdw/gyy,
expect these lower conditions to arrive over the next 1-3 hours.

East northeast winds will gradually turn to the southeast later
this morning, and then finally to the southwest and west later
today.

Rodriguez

Marine
405 am cdt
low pressure continues to slowly lift northeast through the mid
mississippi valley this morning, with more of an easterly wind in
place. This low will move into northern illinois today, and then
across the lake early this evening. This will provide highly
variable winds over much of the lake today into tonight, however,
do expect speeds to diminish today into tonight. The higher speeds
which provided conditions hazardous for small craft across the
illinois nearshore have diminished. Higher waves are still in
place, and so have continued the small craft advisory today. Will
monitor for a possible early end time though. Continue to monitor
fog over the south half of the lake, and at this time, it still
appears that the more dense fog is situated over the western
shores of the lake. It does look like this dense fog will continue
for much of today, and quite possibly expanding over much of the
southern half of the lake. Will monitor the possible need for
expansion of the dense fog advisory to remaining areas over the
south half of the lake.

Rodriguez

Lot watches/warnings/advisories
Il... None.

In... None.

Lm... Small craft advisory... Il nearshore waters until 5 pm Sunday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FSTI2 4 mi137 min NNE 7
OKSI2 9 mi137 min ESE 7 47°F
CHII2 - Chicago, IL 10 mi27 min E 8.9 G 8.9 43°F 43°F
CNII2 13 mi17 min NE 1.9 G 4.1 42°F
JAKI2 18 mi137 min SE 1.9
CMTI2 - 9087044 - Calumet, IL 22 mi47 min E 4.1 G 5.1 44°F 1011.8 hPa44°F
WHRI2 - Waukegan Harbor, IL 24 mi37 min NNE 9.9 G 13
KNSW3 - Kenosha, WI 39 mi77 min NNE 11 G 14 39°F 1013.9 hPa (-2.0)
BHRI3 - Burns Harbor, IN 39 mi37 min SE 14 G 18 52°F 1012.9 hPa
MCYI3 - Michigan City, IN 46 mi27 min ESE 8 G 9.9 48°F 48°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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Last
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NW11
G17
NW10
G15
N10
G15
N11
G17
N9
G13
N9
G13
NW9
G13
NW12
G15
NW10
G13
N7
NW7
NW7
NW11
G16
NW14
G18
NW10
G14
NW7
NW4
NW4
E5
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G11
NE7
E5
G8
E3
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G9
1 day
ago
S7
G10
S10
G13
S15
G20
S12
G19
S12
G18
S8
G18
S18
G24
S18
G25
SW18
G30
SW10
G23
SW14
G25
SW12
G23
S14
G21
NW25
G32
NW19
G26
NW15
G20
N10
G17
NW11
G14
NW12
G23
N14
NW11
G16
NW12
G18
NW11
G17
NW10
G16
2 days
ago
SE6
SE9
G13
SE7
G14
SE10
G15
SE11
G15
SE7
G10
S10
G16
SE11
G15
SE11
G16
SE11
G17
SE14
G17
S13
G21
SE13
G16
SE11
G18
SE12
G17
SE9
G15
SE9
G13
S9
G14
S7
G11
S5
G8
S4
G7
SE5
S4
S4
G7

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL12 mi25 minE 43.00 miFog/Mist44°F44°F100%1012.8 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi26 minNE 53.00 miFog/Mist47°F45°F93%1012 hPa
Chicago, Chicago Midway Airport, IL17 mi24 minVar 53.00 miLight Rain Fog/Mist48°F48°F100%1012.2 hPa

Wind History from PWK (wind in knots)
5
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Last 24hrN10N4NE7NE9
G18
NE12
G21
NE13
G21
NE14
G20
NE10NE11NE10
G17
NE9N9N8NE6N10NE7NE6NE7NE7NE5NE6NE4NE4E4
1 day agoS4S8S8S10SW10S12
G26
SW14
G22
SW13
G21
W17
G26
SW14
G22
W18
G25
SW12
G20
NE9
G19
N13
G20
N10
G21
N10
G15
NE12
G19
N11N12N10N11N9N11N12
2 days agoSE6SE8S10SE9SE11SE11S11S12SE12S16SE7S14
G21
SE11S13S17S11S11
G19
S8S6S4S8S9S10S9

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 (5,6,7,8)
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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.