Friday, April20, 2018 L-36.com


Marine Weather and Tides
Evanston, IL

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 5:59AMSunset 7:39PM Friday April 20, 2018 3:22 PM CDT (20:22 UTC) Moonrise 9:41AMMoonset 12:00AM Illumination 29% Phase: Waxing Crescent; Moon at 5 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-calumet Harbor To Gary- 256 Pm Cdt Fri Apr 20 2018
Tonight..East winds 5 to 10 kt. Mostly clear in the evening then becoming mostly cloudy. Waves 1 to 2 ft.
Saturday..Northeast winds 5 to 10 kt. Mostly cloudy. Waves around 1 ft.
Saturday night..Northeast winds 5 to 10 kt. Mostly cloudy. Waves around 1 ft.
Sunday..Northeast winds 10 to 15 kt. Mostly Sunny. Waves around 1 ft building to 1 to 3 ft in the afternoon.
LMZ741 Expires:201804210330;;247761 FZUS53 KLOT 201956 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 256 PM CDT Fri Apr 20 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>743-210330-

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 201935
afdlot
area forecast discussion
national weather service chicago romeoville, il
235 pm cdt Fri apr 20 2018

Short term
158 pm cdt
tonight through Saturday...

quiet weather takes us into the weekend, though increasing
mid high clouds and modest easterly winds will keep temps near but
just below average.

Early afternoon surface analysis indicates surface high pressure
spread across the upper mississippi valley and western great lakes
region. Dry air, plenty of Sun and light winds have produced a
pleasant spring day, though a lake breeze has pushed in off the
lake keeping lake shore areas in the 40's this afternoon while
other areas approach 60 degrees. The surface high will continue to
drift eastward tonight and Saturday, becoming centered across the
central and eastern lakes by Saturday evening. Further west, a
closed upper low near the four corners region will cross the
southern rockies by tomorrow morning, with diffluent upper level
flow downstream into the midwest resulting in an increase in mid
and high cloud cover across the region from late tonight through
the day Saturday. With low level winds from the east, and the
thickening high cloud cover, 925 mb temps are progged about 2c
lower than today, supporting MAX temps in the mid-upper 50's for
the most part, while onshore winds again limiting locations along
the shore of lake michigan to the mid 40's. Winds generally 10 mph
or less however, making it feel much better than last weekend.

Ratzer

Long term
233 pm cdt
Saturday night through Friday...

Saturday night through Monday: quiet weather will continue through
the start of this forecast period as mid-level ridging crosses the
area while a mid-level lows drifts eastward across the southern
states. Filtered sunshine is expected Sunday and Monday as a result
of passing mid to high-level clouds from the low to the south. This
should keeps MAX temps a few degrees below what would be expected
with the airmass over the area. Light easterly gradient flow will
also keep shoreline temps cooler.

Tuesday and Wednesday: troughing over the northern great plains
will begin to cut-off from the larger-scale flow over the upper
mississippi river valley Tuesday evening, with the low drifting
across illinois on Wednesday. An associated surface low will cross
southern wisconsin while weakening Tuesday night. Conditions
should remain dry through Tuesday afternoon, and likely Tuesday
evening, before the mid-level low nears. Given the lack of
organized forcing, will maintain chance pops for most of the area
late Tuesday night into Wednesday evening.

Thursday and Friday: a broad upper trough will redevelop across
eastern canada and new england as the two aforementioned lows are
absorbed into a strong trough over the central u.S. While guidance
agrees on the development of this trough, there is disagreement
on the evolution. There should be a few chances for showers during
this time as temps drop back to seasonably cool levels for late
april.

Kluber

Aviation
For the 18z tafs...

no significant aviation concerns next 24-30 hours.

Surface high pressure drifting east across the area early this
afternoon, with calm or light variable winds predominant. Lake
breeze has developed and begun to move inland off lake michigan
per ord tdwr data, and extrapolation of the boundary would suggest
it will arrive at mdw by 19z and ord by 1930z. Some airport
sensors already showing some light NE or E component per cwsu zau,
prior to lake breeze boundary passage.

With surface high off to the east of the terminals tonight and
Saturday, modest east flow is expected to persist.VFR conditions
will prevail, though with a thickening and gradual lowering of
high and mid cloud late tonight into the day Saturday.

Ratzer

Marine
233 pm cdt
generally quiet conditions with winds under 20 knots are expected
for lake michigan through Tuesday as high pressure drifts across the
western great lakes. Weakening low pressure will cross southern lake
michigan early Wednesday morning as a ridge builds into the upper
mississippi river valley, supporting a period of northerly winds to
25 knots Wednesday into Wednesday night.

Kluber

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
FSTI2 4 mi143 min ESE 5.1 42°F
OKSI2 9 mi143 min E 5.1 G 5.1 42°F
CHII2 - Chicago, IL 10 mi33 min E 9.9 G 9.9 46°F
CNII2 13 mi23 min NE 1.9 G 4.1 44°F 35°F
JAKI2 18 mi143 min E 4.1 G 6 44°F
CMTI2 - 9087044 - Calumet, IL 22 mi53 min NE 8 G 8.9 43°F 1031.8 hPa30°F
WHRI2 - Waukegan Harbor, IL 24 mi43 min SSE 2.9 G 5.1 47°F
KNSW3 - Kenosha, WI 39 mi83 min 44°F 1032.5 hPa (-1.0)
BHRI3 - Burns Harbor, IN 39 mi43 min ENE 7 G 8 44°F 1032.8 hPa
MCYI3 - Michigan City, IN 46 mi33 min NNE 5.1 G 6 40°F 33°F

Wind History for Calumet Harbor, IL
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N11
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL12 mi31 minN 010.00 miFair59°F21°F23%1032.6 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi32 minE 310.00 miPartly Cloudy59°F18°F20%1031.6 hPa
Chicago, Chicago Midway Airport, IL17 mi30 minENE 1010.00 miMostly Cloudy59°F17°F19%1032.2 hPa

Wind History from PWK (wind in knots)
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Last 24hrN9N8NW9NW10NW8NW3W4NW3CalmCalmCalmCalmCalmCalmCalmCalmN4E3CalmCalmNW63NE6Calm
1 day agoNE8N6N8N6N5NW6NW7NW7N6N8N15
G22
N7N7N6N6N7N8N7N7N9NW11N11NW8N7
2 days agoNW7
G16
5N10N6E5E3E3CalmN3CalmCalmNE3CalmCalmNE3E6E8
G18
E10
G15
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G18
E11
G21
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NE12
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NE12
G20
NE8
G17

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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wmap_A
GOES Local Image of    EDIT
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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Chicago, IL (16,3,4,5)
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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.