Saturday, September23, 2017 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 6:39AMSunset 6:46PM Saturday September 23, 2017 5:01 PM CDT (22:01 UTC) Moonrise 10:00AMMoonset 8:57PM Illumination 11% Phase: Waxing Crescent; Moon at 3 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
    EDIT      (on/off)   Help
LMZ741 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 300 Pm Cdt Sat Sep 23 2017
Tonight..East winds 10 to 15 kt early, diminishing to 5 to 10 kt and becoming southeast. Clear. Waves 1 to 2ft.
Sunday..Southeast winds 5 to 10 kt becoming east at 10 to 15 kt in the afternoon. Sunny. Waves 1 to 2 ft.
Sunday night..Southeast winds 10 to 15 kt becoming south 5 to 10 kt after midnight. 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.
LMZ741 Expires:201709240330;;825723 FZUS53 KLOT 232000 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 300 PM CDT Sat Sep 23 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>742-240330-

7 Day Forecast for Marine Location Near Evanston, IL
   Hourly   EDIT   Help
location: 42.03, -87.69     debug


Area Discussion for - Chicago, IL
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 klot 231915
afdlot
area forecast discussion
national weather service chicago romeoville, il
215 pm cdt Sat sep 23 2017

Short term
209 pm cdt
through Sunday...

very warm temperatures continue to be the weather focus through
the near term forecast period this afternoon. Record temps
occurring again this afternoon, though with more pronounced lake
breeze now providing some relief locations near lake michigan.

Chicago o'hare set another record high this afternoon in this
string of 90+ degree days in late september, reaching 95 degrees.

Lake breeze is about to push through both ord and mdw as of 2 pm
cdt, which should allow temps to cool a bit, with current temps
along the lake shore in the upper 70's and lower 80's. Rockford
has also set a new record high temp for the 23rd, reaching 83
degrees this afternoon. Most other inland locations were
reporting temps in the lower 90's.

While the upper pattern will remain similar across the conus
through Sunday, the core of the upper level ridge will shift a bit
to the east, with slightly lower thickness values across the
forecast area. 850 mb temps, which were +20c per dvn's 12z raob
this morning, are progged to cool slightly into the +16 18c range
Sunday, with correspondingly slightly lower daytime high temps.

Highs Sunday are still expected to be unusually warm (and near
records, which are 91 and 92 for chi and rfd respectively) for
the time of year, ranging from 88-92 degrees based on low level
thermal progs. Light southeast low level wind field will again
support development of a cooling lake breeze across parts of the
chicago area by afternoon, with winds becoming more easterly off
the lake.

Otherwise, cumulus field across western CWA could still produce an
isolated stray shower late this afternoon, though probability and
coverage are expected to be too low to carry pops.

Ratzer

Long term
Sunday night through Saturday...

215 pm... Continued little change to the forecast for early mid
next week. Temps will remain well above normal until a cold front
arrives late Tuesday into Tuesday night. Models continue to trend
drier with precip chances as this front moves across the area and
its possible that many areas may see just a brief shower with the
best chances for precip across the northwest CWA Tuesday afternoon
into Tuesday evening. High temps continue to rise above guidance
highs and expect this trend to continue on Monday with highs near
90 most areas... With a lake breeze keeping the lakeshore several
degrees cooler. An isolated shower is possible Monday afternoon
mainly west of the CWA and chances remain too low to mention.

Light patchy fog will also remain possible Sunday night into
Monday morning and again Monday night into Tuesday morning.

This cold front will drop temps into the 70s Wednesday and
Thursday but a stronger push of colder air will arrive Thursday
night into Friday and this will keep highs in the 60s Friday and
Saturday. Some lake effect rain showers are expected and with
primarily northwest flow... These would currently only reach into
far northwest indiana. Overnight lows by next weekend will be in
the 40s with the usual cool spots possibly dipping into the upper
30s next Saturday night. Cms

Aviation
For the 18z tafs...

aviation weather concerns remain minimal this afternoon, with lake
breeze passage and shift to a more solid east-southeast wind at
ord and mdw the only real issue. Extrapolation of current lake
breeze boundary would indicate a timing of about 19z or so at mdw
and 20z or so for ord. Light southeast winds should prevail
overnight into Sunday, with another east-southeast lake breeze
push Sunday afternoon.

Otherwise,VFR conditions to prevail, except for potential for
some light MVFR fog again for dpa toward sunrise Sunday.

Ratzer

Marine
215 pm... A series of weak low pressures will move from the north
central plains into ontario and quebec through midweek with with
the last low dragging a cold front across lake michigan Tuesday
night. Southerly winds will continue until this front arrives and
then winds will shift northwest and increase to 15-25kts with a
a short period or some gusts to 30 kts possible. Winds will
diminish by Wednesday night... Turn southwesterly Thursday and then
another stronger cold front will move across the region Thursday
night... Shifting winds back northwesterly with speeds likely
increasing to 30kts with a period of gales possible Friday
afternoon evening. Cms

Lot watches warnings advisories
Il... None.

In... None.

Lm... None.

Visit us at http: weather.Gov chicago (all lowercase)
follow us on facebook... Twitter... And youtube at:


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FSTI2 4 mi121 min SSE 1.9 79°F
45174 7 mi31 min E 7.8 G 9.7 76°F 74°F1 ft71°F
OKSI2 9 mi121 min SE 1.9 80°F
CHII2 - Chicago, IL 10 mi41 min E 13 G 13 79°F 70°F
CNII2 13 mi31 min 81°F
JAKI2 18 mi121 min E 4.1 80°F
CMTI2 - 9087044 - Calumet, IL 22 mi43 min NE 8 G 11 80°F 1016.7 hPa71°F
WHRI2 - Waukegan Harbor, IL 24 mi81 min S 4.1 G 5.1 82°F
BHRI3 - Burns Harbor, IN 39 mi60 min E 8.9 G 9.9 79°F 1017.6 hPa
KNSW3 - Kenosha, WI 39 mi61 min S 7 G 8 77°F 1016.9 hPa (-1.7)
45170 43 mi31 min E 7.8 G 7.8 76°F 74°F1 ft73°F
MCYI3 - Michigan City, IN 46 mi41 min NE 12 G 12 76°F 69°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
Last
24hr
E6
G9
E7
G10
E8
G11
E9
SE7
E3
E1
S3
S5
SW3
S3
SW3
S2
S2
S2
S2
E3
E4
NE5
NE6
NE9
NE7
NE9
NE8
1 day
ago
E8
G11
E7
E7
G10
E2
N1
S2
S3
S3
S2
S5
G8
S6
S4
SW4
S3
S2
S5
SW5
S5
S6
G9
S7
G11
S7
G10
SE8
G12
SW4
G11
NE4
2 days
ago
S11
G16
S10
G16
SE6
G10
SE8
G12
S8
G15
S6
G12
S6
S4
S5
G9
S4
SW2
S1
S3
S5
S5
SW5
SW6
S5
S4
SE4
E4
G7
NE8
NE4
G8
NE6

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL12 mi69 minE 610.00 miFair91°F66°F45%1017 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi70 minE 1110.00 miA Few Clouds92°F64°F40%1016.2 hPa
Chicago, Chicago Midway Airport, IL17 mi68 minE 1210.00 miA Few Clouds92°F66°F43%1015.5 hPa

Wind History from PWK (wind in knots)
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
Last 24hrS5SW4E5SE3SE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS5S4S6SE4S3E6SE10E6
1 day agoE5CalmCalmCalmCalmCalmCalmCalmCalmSE3SE3S5S4CalmCalmS3S6SW6SW6SW9
G15
S11
G17
S96SW3
2 days agoS15
G24
S16
G21
S11
G20
S10S11S7S7S8SW5W4CalmSE3CalmCalmSE3S4S4S5SE5SE53NE9NE6E6

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Chicago, IL (18,4,5,8)
      (on/off)   Help

Ground Weather Radar Station Chicago, IL
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.