Friday, October20, 2017 L-36.com


Marine Weather and Tides
Gurnee, 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 7:10AMSunset 6:02PM Friday October 20, 2017 11:20 AM CDT (16:20 UTC) Moonrise 7:49AMMoonset 6:56PM 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
    EDIT      (on/off)   Help
LMZ740 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 900 Am Cdt Fri Oct 20 2017
Rest of today..South winds 15 to 20 kt. Sunny. Waves 2 to 4 ft.
Tonight..South winds 15 to 20 kt. Partly cloudy. Waves 2 to 4 ft.
Saturday..South winds 15 to 25 kt. Partly Sunny. Waves 2 to 4 ft.
Saturday night..South winds 20 to 25 kt. Chance of showers and slight chance of Thunderstorms through the night. Waves 3 to 5 ft. A small craft advisory will likely be needed.
LMZ740 Expires:201710202115;;137870 FZUS53 KLOT 201400 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 900 AM CDT Fri Oct 20 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>742-202115-

7 Day Forecast for Marine Location Near Gurnee, IL
   Hourly   EDIT   Help
location: 42.38, -87.94     debug


Area Discussion for - Chicago, IL
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 klot 201135
afdlot
area forecast discussion
national weather service chicago romeoville, il
635 am cdt Fri oct 20 2017

Short term
Through tonight...

230 am... No forecast concerns this period. High pressure will
remain across the east coast mid atlantic with a trough of low
pressure across the plains. The gradient will slowly tighten with
southerly winds increasing to 10-20 mph with some higher gusts
possible this afternoon. Temps are currently in the upper 40s to
lower 50s and probably won't drop much more before sunrise.

Guidance highs for today are all in the upper 70s and its likely
several areas will tag 80. Temps will drop into the 60s this
evening with lows by Saturday morning likely staying in the 50s.

Increasing high clouds today which will thicken a bit more
tonight. Cms.

Long term
Saturday through Thursday...

230 am... Forecast concerns include rain chances Saturday night
through Sunday evening... Then two cold fronts and associated cold
air burst behind each front.

The gradient will tighten further on Saturday with southerly winds
into the 15-25 mph with higher gusts. There will likely be more
cloud cover Saturday... Perhaps in the afternoon and this lowers
the confidence for high temps which for now are near guidance
highs but its likely that highs on Saturday could be similar to
Friday... Especially across eastern areas.

A cold front will move across the area on Sunday with showers
developing ahead of the front late Saturday night and continuing
for much of Sunday. Timing appears to have slowed just a bit with
the best chances for rain from daybreak Sunday through mid late
afternoon. Thunder chances look fairly low and will continue with
slight chance mention. QPF amounts look to be mainly under an
inch... Storm total but there could be band axis of heavier
rainfall though too difficult to pin down where this may occur
just yet. Models differ on end time across the eastern CWA Sunday
night into Monday morning and trends will need to be monitored as
to the exact end time of precip.

The first of two stronger cold fronts will arrive Monday as an
upper low closes off over the lakes region Tuesday into Wednesday.

This will spread much cooler air across the region through
midweek along with showers and potentially lake effect showers in
northwest indiana though too early for exact locations which will
be dependent on wind direction. Also currently looks to stay warm
enough that this precip should remain all rain but if precip can
become heavy enough and cool the column enough... Then some mixed
snow can't be completely ruled out.

This midweek upper low shifts east by Thursday with a short-lived
ridge building across the area Thursday then another strong cold
front moves across the area from late Thursday afternoon through
Thursday night... Still some timing differences. This cold blast
will likely be colder than the first and while its just beyond the
end of this period... It also looks to be short lived as temps
begin to moderate going into next weekend. Cms

Aviation
For the 12z tafs...

south winds andVFR conditions will prevail throughout the taf
period. Expect winds to become gusty late this morning through the
afternoon, gusting up to around 20 kt at times. After sunset this
evening, a low level jet will form along the mississippi valley
with winds speeds at 020 increasing into the 40 to possibly 50kt
range, mainly at rfd but cannot rule out the chicago area
terminals as well. These higher winds for now are advertised by
the NAM while the GFS and ECMWF cap winds just below 40kt. Llws
may need to be added to the tafs at some point, but for now will
hold off due to lower confidence.

Bmd

Marine
244 am cdt
high pressure is centered east of lake michigan today while low
pressure is slowly deepening over alberta. Moderate south to
southwest winds will be in place across lake michigan through most
of the weekend. These winds will gradually strengthen to around 30
kt from late tonight through midday Sunday. Shallow mixing and
stable conditions just off the surface will help limit the
magnitude of the wind gusts, but cannot rule out a sporadic gale
force gust Saturday into Sunday. A cold front will move across
lake michigan on Sunday resulting in winds shifting out of the
west to northwest later Sunday into Sunday night. Winds briefly
back to the southwest once again early Monday ahead of a second
and stronger cold front which will move across the lake Monday
evening and night with winds swinging back to the northwest to
north at around 30 kt and gales once again a possibility.

Bmd

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
WHRI2 - Waukegan Harbor, IL 7 mi161 min WSW 15 G 19 61°F
KNSW3 - Kenosha, WI 16 mi141 min SW 8 G 11 62°F 1021 hPa (+0.3)
45174 23 mi111 min SW 9.7 G 12 61°F 58°F2 ft53°F
CHII2 - Chicago, IL 38 mi121 min SSW 16 G 17 63°F 51°F
CNII2 40 mi111 min W 4.1 G 8 63°F 48°F
MLWW3 - Milwaukee, WI 46 mi121 min SW 8.9 G 9.9 62°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
12
PM
1
PM
2
PM
3
PM
4
PM
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
Last
24hr
N6
NE4
NE5
NE5
E5
G8
E6
E6
E4
SE3
SE2
SE3
S4
S6
G9
S6
S5
S4
G8
S4
S5
S4
S4
S7
G10
S7
G10
S7
S5
G9
1 day
ago
S11
G17
S13
G20
S12
G16
S14
G19
S10
G18
S10
G15
S10
G14
S7
G11
S8
G11
S9
G14
S10
G14
SW9
G13
SW9
G13
SW8
G12
SW8
G13
SW5
G11
SW6
G10
SW5
SW5
SW3
SW3
NW4
NW8
G11
N7
G10
2 days
ago
SW12
G16
S14
G19
S15
G20
S13
G18
SW8
G12
SW12
G15
S7
G10
S8
G11
S8
G11
S8
G12
S8
G11
S8
G12
S7
G10
S6
G10
S5
S4
S6
S5
S6
G10
S6
S6
S8
G11
S10
G14
S8

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL5 mi26 minSSW 1010.00 miFair70°F54°F57%1020.3 hPa
Kenosha, Kenosha Regional Airport, WI15 mi28 minWSW 910.00 miFair70°F52°F53%1020.6 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi29 minS 810.00 miFair69°F53°F57%1021.6 hPa

Wind History from UGN (wind in knots)
12
PM
1
PM
2
PM
3
PM
4
PM
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
Last 24hrCalmCalmE7SE8SE7S8S7S5S4S4SW4S4S4S7S4SW5SW7SW6SW7SW8SW8SW10SW8SW10
1 day agoS14S16SW19
G25
SW21
G25
S13
G21
S13
G22
SW11S11SW11SW12SW11
G17
SW12SW10SW9SW8SW74W3CalmCalmW3CalmN4NW4
2 days agoSW14
G22
SW11
G23
SW16
G26
SW12
G21
SW15
G23
SW12
G18
SW11SW8SW9SW7SW10SW9SW9SW8SW6S5S7S9SW10SW9SW12SW11SW12S13

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 (12,3,4,5)
      (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.