Tuesday, March28, 2017 L-36.com


Marine Weather and Tides
Woodstock, IL

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:39AMSunset 7:17PM Tuesday March 28, 2017 6:30 PM CDT (23:30 UTC) Moonrise 7:16AMMoonset 8:07PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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- 615 Pm Cdt Tue Mar 28 2017
.dense fog advisory in effect until 9 am cdt Wednesday...
.small craft advisory in effect until 3 am cdt Wednesday...
Tonight..Northeast winds 10 to 20 kt becoming east late. Areas of dense fog. Waves 3 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
Wednesday..Northeast winds 20 to 25 kt. Areas of dense fog in the morning. Waves 2 to 4 ft building to 3 to 6 ft occasionally to 8 ft. A small craft advisory will likely be needed.
Wednesday night..East winds to 30 kt. Rain likely. Waves 3 to 6 ft occasionally to 8 ft building to 5 to 8 ft occasionally to 10 ft after midnight.
Thursday..East winds to 30 kt. Rain. Waves 6 to 9 ft occasionally to 11 ft.
LMZ740 Expires:201703290315;;232662 FZUS53 KLOT 282315 AAA NSHLOT NEARSHORE MARINE FORECAST...UPDATED NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 615 PM CDT TUE MAR 28 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>742-290315-

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 281956
afdlot
area forecast discussion
national weather service chicago/romeoville, il
256 pm cdt Tue mar 28 2017

Short term
157 pm cdt
through Wednesday...

main concern for the short term forecast period will be timing of
pcpn spreading from west to east across the region tomorrow.

Conditions will remain quiet through the remainder of the
afternoon and overnight as a ridge of high pressure builds
across the upper mississippi valley to the upper great lakes,
while low pressure begins to develop over the south high plains.

Prevailing enely-nly will keep wind flow off of lake michigan,
with lakefront locations remaining cooler than inland locations.

Highs today should range from around 40 f near the lake to around
50 f well inland. The only concern of note through the night will
be the amount of cloud cover across the region. Latest satellite
imagery shows some drier air moving swd through SRN wi as the
ridge builds ewd, far il could see at least some partial clearing
overnight, which, in turn, would allow for temps to drop off a
little faster than the remainder of the area. Lows tonight should
range from the middle 30s along the wi border to the upper 30s to
low 40s south of i-80. Any partial clearing of cloud cover should
be short lived as low pressure developing over the south high
plains deepens and tracks to the northeast as the parent upper low
lifts into the central plains through the day tomorrow. While sfc
flow should trend to more sely, mid level toughing should help
begin to draw some gulf moisture northward. Weak short wave energy
lifting out ahead of the upper trough will help to initial some
pcpn across the area, with pcpn chances generally spreading from
west to east through the day, possibly beginning over the rfd area
by early afternoon and spreading to the chicago area by late
afternoon or early evening. While the upper low begins to lift out
of the desert southwest tomorrow, upper ridging will build over
the upper midwest, allowing for temperatures a few degrees higher
Tuesday than were seen on Monday. While lakefront locations will
still remain relatively cool, with highs in the lower 40s, inland
locations should see highs in the lower to middle 50s.

Long term
221 pm cdt
Wednesday night through Tuesday...

the upper level split flow pattern will continue this forecast
period with series of upper level systems progressing west to east
across the conus. Hence main forecast concerns will be rain with
scattered thunder Wednesday night through Thursday night with the
next approaching upper low... Followed by rain chances returning
with the next upper low Monday-Tuesday.

Upper level low currently near the 4 corners area will work slowly
east into the southern plans Wednesday. Both rising heights aloft
ahead of the low combined with relatively dry anticyclonic boundary
layer flow around slowly departing hudson bay surface high may
help to slow increase of precip coverage/intensity into northern
il initially. Weak upper shortwave riding a top the shortwave
riding combined with modest isentropic ascent may help squeeze out
sprinkles/patchy light rain as early as afternoon over the
rfd/i-39 corridor and toward the evening rush across the chicago
metro.

Better rain to get going overnight Wednesday into Thursday as the
column saturates and given broader ascent ahead of the northward
moving warm front. 12z gfs/nam QPF amounts trending upward from
previous runs with 48 hr rains of 1.0 to 1.25 inches wed-fri
seeming reasonable now. While mid level lapse rates remain more
impressive to our south, can't rule out some rumbles of thunder,
particularly southern sections of the forecast area late Wed night
and Thursday... And the entire area by Thursday afternoon/evening
as lapse rates steepen slightly as the surface low reaches to
just south of kankakee by Thursday evening per gfs/canadian gem
solutions.

Given such synoptic set up by Thursday afternoon/evening also would
expect fairly tight nne gradient across northern il and hence a
brisk nne flow with gusts 25-30 mph... Perhaps as high 35 mph at
the lakefront.

Low slides slowly off to the east Friday. Weak surface ridging
allows for residual low level moisture to persist much of the day
Friday however before rising heights aloft and associated
subsidence helps scour out low level moisture Friday night into
Saturday. Weekend shaping up generally dry with next chance of
rain arriving later Monday as next in the series of upper troughs
tracks well south across the southern plains but then lifts
northeast across the ohio valley into Tuesday.

Ed f

Aviation
For the 18z tafs...

ceilings remain the primary forecast challenge and even the short
range guidance continues to have a poor handle on the details of
the trends. The observed trends this morning have been for a very
slow lifting/improvement of cigs, and anticipate that this should
be the trend for the remainder of the afternoon and through the
night. Looking at sounding information, an inversion should remain
in place through the period, which would inhibit vertical mixing
down of drier air aloft, so have maintained the MVFR CIGS through
the night for the chicago area terminals. With high pressure
building across the upper mississippi valley and upper great
lakes, winds should generally remain nely, so flow will remain off
the lake for the chicago area terminals, helping to keep the lower
cigs in place. Latest satellite trends indicate some upstream
scattering of cloud cover over SRN wi which coincides with the
drier air. So, have improved CIGS at rfd toVFR, given the drier
advection. The greatest uncertainty to the forecast will be for
cigs tomorrow morning. With an inversion becoming stronger
overnight, and winds remaining off of the lake, there is a chance
that CIGS will not have an opportunity to improve toVFR tomorrow
morning, but confidence is relatively low at this time to keep the
MVFR CIGS through the morning hours tomorrow. So, have maintained
an improving trend for CIGS for tomorrow, but there is a chance
that CIGS will need to be lowered in later updates. Otherwise,
have relatively high confidence in wind trends given the
persistence of the ridge of high pressure moving across the upper
mississippi valley and upper great lakes while low pressure
deepens over the central plains tomorrow. This pattern would
suggest a trend to more ely winds tomorrow.

Marine
256 pm cdt
a north-south oriented ridge of high pressure across the western
great lakes will slowly move off to the east tonight and
Wednesday. This will allow for low pressure over the southern
plains to lift northeast into the mid mississippi valley
Wednesday night into Thursday. This low will then slowly move
northeast across the eastern great lakes Friday while a ridge of
high pressure builds back into the lake michigan basin Saturday...

moving over the lake Saturday night into Sunday.

Strongest winds of the period will be felt late Wednesday night
through Friday (northeast winds to 30 kts) as the low passes to
the south of lake michigan.

Ed f

Lot watches/warnings/advisories
Il... None.

In... None.

Lm... Small craft advisory... In nearshore waters until 9 pm Tuesday.

Small craft advisory... Il nearshore waters until 3 am Wednesday.

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 mi51 min N 14 G 16 35°F
KNSW3 - Kenosha, WI 39 mi31 min NNE 14 G 16 34°F 1022 hPa (+1.0)
FSTI2 49 mi91 min N 14 38°F
CHII2 - Chicago, IL 54 mi41 min N 9.9 G 11 38°F 38°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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
5
PM
6
PM
Last
24hr
N6
G9
N7
G10
N6
G9
N7
N7
NW8
G11
NW11
G15
NW10
G14
NW10
G16
N14
G20
N12
G16
N14
NW13
G18
NW12
G15
NW13
G17
NW12
G16
NW14
G17
NW12
G18
N13
G16
N13
G17
NW11
G16
N11
G15
N11
N9
G13
1 day
ago
SW5
G8
SW8
G12
SW7
G11
SW7
G12
SW6
G12
SW6
G11
SW7
G10
SW5
G8
SW6
G11
SW7
G11
SW6
G12
SW4
G11
S7
N3
N4
G7
N5
G8
E4
NE6
NE5
NE5
N5
N4
G7
N7
G10
N7
G10
2 days
ago
NW10
G14
NW7
NW4
NW4
E5
E8
G11
NE7
E5
G8
E3
E6
G9
E9
G12
E8
E7
SE4
G10
SE8
G12
SE8
G11
SE7
S5
G8
SW7
G10
SW4
G9
SW11
G17
SW10
G16
SW6
G12
SW6
G11

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Burlington Municipal Airport, WI27 mi56 minENE 1010.00 miFair50°F41°F73%1021.3 hPa

Wind History from BUU (wind in knots)
7
PM
8
PM
9
PM
10
PM
11
PM
-12
PM
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
5
PM
6
PM
Last 24hrNE3NE8E6NE5E3CalmNE5NE5N5N5N3N6N3N6N6N5NE6N6NE10
G14
NE9E8E11E10E9
1 day agoN3NW3CalmCalmW6NW8NW6NW5W4W3NW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE5NE4NE4
2 days agoNE9
G14
NE8NE9
G14
NE7E9E8NE9NE8E8E6E6E6E5NE5NE5E5E5E4E3CalmCalmCalmCalmCalm

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 (19,4,5,8)
      (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.