Monday, November20, 2017 L-36.com


Marine Weather and Tides
Joliet, 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 6:47AMSunset 4:30PM Monday November 20, 2017 7:31 AM CST (13:31 UTC) Moonrise 9:31AMMoonset 7:24PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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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LMZ742 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 306 Am Cst Mon Nov 20 2017
.small craft advisory in effect through Tuesday afternoon...
Today..Southwest winds 20 to 25 kt increasing to 30 kt. Mostly Sunny. Waves 2 to 4 ft.
Tonight..Southwest winds to 30 kt. Occasional gale gusts to 35 kt. Partly cloudy. Waves 3 to 5 ft.
Tuesday..West winds to 30 kt becoming northwest in the afternoon. Partly Sunny. Waves 3 to 5 ft.
Tuesday night..Northwest winds to 30 kt diminishing to 15 to 20 kt after midnight. Mostly clear. Waves 3 to 5 ft.
LMZ742 Expires:201711201600;;686914 FZUS53 KLOT 200906 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 306 AM CST Mon Nov 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>742-201600-

7 Day Forecast for Marine Location Near Joliet, IL
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location: 41.52, -88.16     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 201130
afdlot
area forecast discussion
national weather service chicago romeoville, il
530 am cst Mon nov 20 2017

Short term
100 am cst
through tonight...

high pressure is across the ohio tennessee valleys early this
morning, with low pressure digging southeast across the canadian
prairies. The high will only slowly shift to the mid atlantic
today, while the low will deepen as it moves toward lake superior.

The upper air pattern with wnw flow will support some cirrus
drifting through that will thin out with time today, otherwise the
weather story of the day will be the mild conditions and breezy
southwest winds that result from the increased gradient between
the two surface features. There is a pretty strong inversion which
will limit mixing, but winds will be potent enough not far off
the ground to support gusts to 30-35 mph this afternoon. Look for
temperatures to peak near 50 or so. The low will continue through
canada just to the north of lake superior, therefore breezy
southwest winds will continue, and with some increasing clouds
overnight lows will hold in the mid to even upper 30s.

Kmd

Long term
100 am cst
Tuesday through Sunday...

while the forecast largely remains dry, the temperature roller
coaster ride will continue to be the story in the long term. A
sharp positively tilted shortwave trough will shift through
wisconsin, and will steer a decent cold front through our region
through the day. Models do not paint much precip with the front
other maybe some isolated light showers or sprinkles, with better
(though still lower) chances across northwest north central
indiana in the afternoon. Breezy southwest winds do make a sharp
shift to the northwest and we get another shot of cold air. Cold
low in the 20s Tuesday night give way to highs again only in the
mid upper 30s Wednesday. Winds will slacken through the day
Wednesday as high pressure returns to the mid missouri valley,
with the ridge axis extending across northeast il northwest
indiana.

The pattern from earlier in the week repeats itself for
thanksgiving as the high will shift to the tennessee valley on
the thanksgiving holiday while low pressure will return to the
canadian prairies. It should be a decent day with sunshine high
clouds, and highs will be a tad below normal, but winds will be
relatively light. Then the breezy southwest winds kick up for
Friday as the high will cruise off to the mid atlantic and the
canadian low follows a similar path north of lake superior on
Friday. This time the low is deeper and bit closer to the region,
so we may see some more clouds ahead of it. Low level temps are
even warmer than what we expect for today, so it will again be
mild with highs in the 50 ballpark. There are some low precip
chances with the associated cold front. Temps again take a tumble
for the weekend.

Kmd

Aviation
For the 12z tafs...

530 am... Only forecast concern this period are the winds.

Southwest winds 8-12kt will steadily increase this morning with
speeds in the 14-18kt range from late morning through much of this
evening as a tight pressure gradient moves across the region.

Gusts will be in the mid 20kt range with some occasional higher
gusts. Speeds gusts will begin to diminish early Tuesday morning
and slowly shift more westerly. A cold front will move across the
area mid late Tuesday morning shifting winds northwest. Low level
winds increase this evening and despite the strong gusty winds at
the surface... Low level wind shear will be possible. DryVFR
through tonight with increasing high clouds which will slowly
lower to a mid deck tonight. Cms

Marine
205 am... A large area of high pressure over the southeast u.S.

This morning will move off the atlantic coast tonight. Strong low
pressure will move from southern canada this morning... Across
ontario tonight... And into quebec Tuesday. The gradient between
these two features will tighten this afternoon and tonight with
southwesterly gales expected over lake michigan. A trailing cold
front from this low will move across the lake Tuesday morning...

shifting winds to the northwest. Its possible gale force winds may
continue into early Tuesday evening. A large area of high
pressure will build across the plains Tuesday night and then move
east across the ohio valley Wednesday night and Thursday. Another
strong low is expected to move across ontario Friday with
southwesterly gales possible again Friday afternoon into Friday
evening. Cms

Lot watches warnings advisories
Il... None.

In... None.

Lm... Gale warning... Lmz777-lmz779... 3 pm Monday to 3 pm Tuesday.

Small craft advisory... Il nearshore waters until 6 pm Tuesday.

Small craft advisory... In nearshore waters until 9 am Wednesday.

Visit us at http: weather.Gov chicago (all lowercase)
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
JAKI2 36 mi92 min WSW 8 36°F
CMTI2 - 9087044 - Calumet, IL 36 mi44 min SSW 14 G 19 35°F 1014.4 hPa26°F
CNII2 37 mi32 min S 8 G 11 35°F 24°F
OKSI2 39 mi92 min W 8 38°F
CHII2 - Chicago, IL 41 mi42 min SSW 28 G 32 38°F 26°F
FSTI2 42 mi92 min SW 15 36°F
BHRI3 - Burns Harbor, IN 54 mi52 min S 17 G 20 34°F 1015.6 hPa

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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Last
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W10
G19
W12
G18
W9
G14
SW9
G14
SW13
G18
SW10
G15
SW7
G15
W9
G13
W8
G15
SW8
G13
SW7
G10
SW6
G11
SW8
G11
SW4
G7
SW8
G13
SW9
G13
SW7
G12
SW7
G10
SW10
G13
SW9
G12
S9
G12
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G15
S12
G18
S11
G17
1 day
ago
N9
G17
NW16
G23
N19
G27
NW24
G31
NW20
G31
NW19
G30
NW12
G18
NW15
G22
NW18
G29
NW17
G24
NW15
G25
NW14
G24
NW13
G19
NW15
G22
NW13
G21
NW7
G14
NW15
G21
W10
G15
W8
G17
W12
G17
NW8
G14
NW11
G16
W7
G11
NW12
G17
2 days
ago
SE11
G18
SE12
G16
SE8
G17
S9
G12
SE10
G13
SE9
G14
S11
G17
SE11
G18
SE13
G19
S12
G15
S11
G15
S15
G20
S9
G13
S9
G14
SW9
G14
SW8
G12
S6
N2
NE2
SE3
N2
N11
G14
N12
G19

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Joliet Regional Airport, IL1 mi57 minSSW 710.00 miFair34°F26°F75%1015.6 hPa
Lewis University Airport, IL7 mi57 minSSW 810.00 miFair32°F25°F78%1015.2 hPa
Morris Muni-James R Washburn Field Airport, IL15 mi57 minSSW 1010.00 miFair33°F25°F75%1015.2 hPa
Aurora Municipal Airport, IL24 mi40 minSSW 810.00 miFair31°F25°F79%1015.6 hPa

Wind History from JOT (wind in knots)
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-12
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Last 24hrW9
G14
W10
G17
W9W10
G17
W11
G17
W9
G16
W10
G16
W10
G15
W5SW6SW5SW4CalmCalmS3CalmS5S5S5S5S6S6S6S7
1 day agoN12
G15
N10
G18
N11
G21
N13
G20
N9
G21
NW12
G19
N11
G16
N11
G21
N9
G14
NW9
G19
NW9
G14
NW12
G17
NW9
G18
W7W6
G14
W6NW7NW8NW7
G15
NW8
G17
NW10
G19
NW6NW5W7
G14
2 days agoS10
G16
S10
G18
S12
G18
SE8
G19
S12
G16
S10
G14
SE8SE12
G18
SE9S8S8S10
G14
S10
G16
SW10
G22
S9
G15
SW10SW3CalmCalmCalmN4NE5NE5NE8

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 (8,2,3,4)
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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.