Tuesday, November21, 2017 L-36.com


Marine Weather and Tides
Woodstock, 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 6:51AMSunset 4:28PM Tuesday November 21, 2017 6:07 AM CST (12:07 UTC) Moonrise 10:25AMMoonset 8:08PM Illumination 8% 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
LMZ740 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 309 Am Cst Tue Nov 21 2017
.gale warning in effect until 6 am cst early this morning...
.small craft advisory in effect from 6 am cst this morning through this evening...
Today..Southwest gales to 35 kt early this morning...becoming northwest to 30 kt by late morning. Slight chance of rain. Waves 3 to 6 ft occasionally to 8 ft.
Tonight..Northwest winds to 30 kt diminishing to 15 to 25 kt this evening. Mostly clear. Waves 3 to 5 ft.
Wednesday..Northwest winds 10 to 15 kt becoming west in the afternoon. Sunny. Waves 2 to 4 ft subsiding to 1 to 3 ft in the afternoon.
Wednesday night..Southwest winds 10 to 20 kt. Mostly cloudy. Waves 1 to 3 ft.
LMZ740 Expires:201711211600;;736577 FZUS53 KLOT 210909 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 309 AM CST Tue Nov 21 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>742-211600-

7 Day Forecast for Marine Location Near Woodstock, IL
   Hourly   EDIT   Help
location: 42.32, -88.45     debug


Area Discussion for - Chicago, IL
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 klot 211125
afdlot
area forecast discussion
national weather service chicago romeoville, il
525 am cst Tue nov 21 2017

Short term
107 am cst
through Wednesday...

the story of the next few days will be the temperature swings
along with occasional windy periods. Today we take the ride back
downward as deep low pressure across lake superior will steer a
cold front across the region today.

There is a lead shortwave across southern mn and several others
in the NW flow on the south side of the low driving some mid and
upper level cloudiness, but the focus will be on the deeper trough
axis across northern mn. Model guidance is in good agreement in
driving this energy southeastward today. We do not think this
will be a big deal for our area precip-wise, but several short
term guidance sources paint some light QPF with this wave noted by
some 850 mb fgen, compact omega rh signal as the front shifts
through. The main focus is along and southeast of chicago into
northwest indiana and across east central illinois, but some virga
or very light precip may fall across northeast il as well. Low
level positive energy forecast suggests enough low level warm air
lingers for rain to be the dominant p-type, but cannot rule out a
few snowflakes toward the tail end as the colder low level air
arrives. And the cold air will be noted after a mild Monday, as
the colder air will cruise on into north central illinois not long
after daybreak and spread southeast through the day.

The wave will quickly depart this evening, but the cold northwest
winds will remain in its wake. Lows will fall to near 20 in the
north, mid 20s southeast and in chicago. The surface ridge will
shift over the area on Wednesday. Winds will slacken some, low
level warm advection will ensue, and there should be plenty of
sun, but highs will struggle to reach 40.

Kmd

Long term
107 am cst
Wednesday night through Monday...

another much weaker wave will slide through wisconsin Wednesday
night with precip staying north as the ridge axis will stretch out
southeast of the area across the ohio tennessee valleys into the
mid atlantic. A secondary high will be in place over the area for
thanksgiving day, which will allow temps to recover to the lower
40s. This is still below normal, but with the high resulting in
likely our lightest wind day of the week, all in all pleasant
weather conditions for the holiday.

Friday will be a repeat of yesterday (Monday), as gusty southwest
winds will develop ahead of deepening low just north of lake
superior. The low level thermal fields support even warmer highs
than Monday, which were in the low to mid 50s area wide. The only
kicker will be there may be a bit more cloudiness as the upper
forcing is a bit farther south with this wave. Models still don't
paint much precip again and very well could end up dry, but have
some close bay to warrant not removing a model blend of low
chances. The cold air behind this system does not come slamming in
that quickly but gets reinforced through the weekend, thus highs
Saturday will reach the 40s, then only the 30s Sunday. High
pressure will mean weakening winds, dry conditions, and sun.

Kmd

Aviation
For the 12z tafs...

525 am... Forecast concerns include a wind shift cold front this
morning and the chance of rain showers late morning early this
afternoon.

Southwesterly winds will remain in the 10-15kt range for the next
few hours until a cold front moves across the terminals mid late
this morning. Winds will shift to the northwest behind this cold
front with speeds gusts increasing. Speeds gusts will diminish
early this evening and remain northwest tonight.

As the cold air arrives behind the front later this morning...

most of the short term guidance is now showing a band of light
precipitation developing... Mainly along the i-80 corridor.

Confidence is fairly low regarding this precip potential... But
there is enough of a signal and its close enough to include a
short tempo at mdw gyy. Trends will need to be monitored this
morning. Precip should be light rain sprinkles... But depending on
how fast the cold air arrives... If precip does develop... Then a
rain snow mix is possible.

Increasing mid clouds this morning are expected to lower to a
4kft cig later this morning. There is some potential for high
MVFR clouds... Especially where any precip develops... But
confidence is low. Clouds are expected to scatter out this
evening. Cms

Marine
205 am... Deep low pressure just north of lake superior early this
morning will move into northern quebec tonight as it slowly
weakens. A trailing cold front will move across lake michigan this
morning shifting southwest winds to the northwest. The gales will
likely diminish toward 30kts with the front but a period of low
end gales is possible behind the front... Which may last into early
this evening... But confidence is low. A large area of high
pressure will build across the plains Tuesday night and then
extend east into the ohio valley Wednesday night. Strong low
pressure will move across ontario Friday and Friday night with a
tight southwest pressure gradient developing over the lakes
region. Southwest gales are possible again Friday morning into
Friday evening... With a cold front shifting winds northwest by
Saturday morning with gales still possible behind the front. Cms

Lot watches warnings advisories
Il... None.

In... None.

Lm... Gale warning... Il nearshore waters until 6 am Tuesday.

Small craft advisory... Il nearshore waters until 9 pm Tuesday.

Gale warning... Lmz777-lmz779 until 3 pm Tuesday.

Gale warning... In nearshore waters until 10 am Tuesday.

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 34 mi88 min WSW 18 G 22 45°F
KNSW3 - Kenosha, WI 39 mi68 min SW 12 G 21 45°F 1003 hPa (+0.3)
FSTI2 49 mi128 min SW 38 45°F
CHII2 - Chicago, IL 54 mi48 min SW 24 G 30 46°F 32°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
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
Last
24hr
S12
G18
S11
G17
S13
G19
S12
G18
S17
G23
S13
G19
S17
G22
S19
G25
S17
G23
S15
G23
S14
G22
S14
G23
S17
G27
S18
G26
S16
G22
S16
G29
S18
G25
S21
G27
S17
G23
S15
G21
S13
G23
S14
G20
S15
G21
SW13
G19
1 day
ago
W7
G11
NW12
G17
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
S10
G15
2 days
ago
N11
G14
N12
G19
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

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Burlington Municipal Airport, WI27 mi78 minSW 710.00 miFair40°F35°F83%1002.7 hPa

Wind History from BUU (wind in knots)
7
AM
8
AM
9
AM
10
AM
11
AM
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
Last 24hrS9S9SW10SW13SW13SW15
G21
S14S15
G23
SW18
G28
SW17
G23
S19
G23
S19
G25
SW20SW21
G26
SW20
G28
SW20
G23
SW20
G26
SW16
G21
SW19
G25
SW14
G17
SW14SW9SW8SW7
1 day agoNW11
G15
NW13NW9W13
G19
W10
G17
W11W15
G20
NW9
G15
W10W11
G14
W7SW4SW4SW7SW7SW8SW8SW11SW10SW5SW7S9S9SW8
2 days agoN10
G14
N5N9N7N10N13
G17
N14
G21
N15
G23
N15
G23
N9
G15
N14
G21
NW15
G22
N14
G30
N10NW12
G22
NW12
G19
NW13
G18
NW13
G19
NW11
G20
NW9
G15
NW11
G16
NW9
G12
NW12NW10
G15

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 (7,2,3,4)
      (on/off)   Help

Ground Weather Radar Station Milwaukee, WI
   (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.