Saturday, February24, 2018 L-36.com


Marine Weather and Tides
Highland Park, 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 6:31AMSunset 5:37PM Saturday February 24, 2018 4:22 AM CST (10:22 UTC) Moonrise 12:57PMMoonset 2:57AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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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LMZ740 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 339 Am Cst Sat Feb 24 2018
.small craft advisory in effect from this evening through late tonight...
.gale warning in effect from late tonight through Sunday afternoon...
Today..Northeast winds 10 to 15 kt becoming east 10 to 20 kt this morning. Chance of rain in the afternoon. Waves 1 to 3 ft building to 3 to 5 ft.
Tonight..Southeast winds to 30 kt with a few gale force gusts to 35 kt possible becoming southwest gales to 35 kt late. Rain and slight chance of Thunderstorms, ending late. Waves 4 to 7 ft occasionally to 9 ft.
Sunday..Southwest gales to 35 kt easing to 30 kt in the afternoon. Sunny. Waves 3 to 5 ft subsiding to 2 to 4 ft in the afternoon.
Sunday night..Southwest winds 15 to 25 kt gradually diminishing to 10 to 15 kt. Mostly clear. Waves 1 to 3 ft subsiding to 1 ft or less after midnight. Wave forecast is for ice free areas
LMZ740 Expires:201802241615;;470313 FZUS53 KLOT 240939 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 339 AM CST Sat Feb 24 2018 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>742-241615-

7 Day Forecast for Marine Location Near Highland Park, IL
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location: 42.18, -87.81     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 241000
afdlot
area forecast discussion
national weather service chicago romeoville, il
400 am cst Sat feb 24 2018

Short term
330 am cst
through tonight...

low pressure developing over the southern plains will deepen and
track overhead or just to our northwest over the next 24 hours,
bringing a prolonged period of precipitation followed by the
passage of a cold front late tonight.

The first part of the forecast period this morning could be
somewhat interesting as light rain moves into an area with
temperatures at or just above freezing. Farther upstream over
portions of iowa and missouri there are a handful of stations
reporting mixed precipitation but closer to home the readings are
mostly rain. In general temperatures seem to be nudging above the
freezing rain thresholds as the rain becomes more established in a
location, but as the boundary layer is still in the process of
saturating during the onset of precipitation there could be a
brief period of light freezing rain or even ice pellets. Did not
feel this was going to be widespread or persistent enough to
warrant an inclusion in the forecast, but if trends go a different
direction this would certainly prompt an early morning update.

The first round of precipitation looks to stall somewhere around
the i-80 corridor due to the influence of drier air to the north.

Much of the forecast area except for southern portions could end
up dry this afternoon before the next round approaches this
evening. Along with the rainfall comes a small chance of
thunderstorms. The initial SPC outlook for today included much of
our area in the general thunder category and our southeast third
in a marginal risk for tornadoes and damaging winds. Based on
internal coordination between local forecast offices and SPC this
likely will be pushed back farther south with the next update, so
do not plan to emphasize the severe threat at this time. Local
thinking is that shear is plentiful and instability is present but
limited and likely not surface based this far north.

Beyond precip trends, the other story for tonight will be the
increasing winds after midnight, with gusts by morning likely
exceeding 30 mph especially behind the passage of the cold front
expected during the predawn hours.

Lenning

Long term
330 am cst
Sunday through Friday...

after an active period today and tonight, ridging becomes more
established for the late weekend into early next week. In
addition to helping us see some sunshine again, the position of
the ridge to our south will allow for 2-3 days of warmer
southwest flow. Even Sunday might see a bit of a warmup after the
cold postfrontal start to the day, but Monday thru Wednesday look
much more promising for widespread 50s and perhaps a few locations
in the 60s farther south.

The next weather system arrives midweek and at least at this
time range appears to be potent. Deterministic models are not in
agreement regarding the strength and track of the low but early
indications are that we stay in the warmer sectors and see
primarily rain, perhaps with some thunder, and another round of
strong winds.

Friday again looks dry with seasonable temperatures, but timing
changes for the midweek system could bring corresponding changes
to the late week trends.

Lenning

Aviation
For the 06z tafs...

the main forecast concern continues to center around cig trends
though the period, as well as the potential for more ifr to lifr
conditions this evening with the next batch of rain and fog.

Strong westerly winds are then looking likely late tonight into
Sunday morning.

Surface high pressure over southern minnesota will shift eastward
towards the western great lakes around daybreak. As this occurs,
expect light northerly winds overnight becoming easterly during
the day and gradually increasing into this evening. The main
concern for the winds is overnight tonight into Sunday morning.

Following the passage a surface low and associated cold frontal
passage late tonight, it is looking like a period of strong
westerly winds (gusts of 30-35 kt) will set up over the area into
early Sunday morning.

The main concern in regards to CIGS and visibilities will be this
evening. During this period the chances for rain and fog will
increase across the area in advance of the next area of low
pressure approaching the area from the southwest. It appears
likely that the area will get a period of very low CIGS (lifr) and
lower visibilities in fog and rain, especially during the evening.

Conditions should improve overnight with the passage of the cold
front and the increase in westerly winds.

Kjb

Marine
232 am cst
low pressure over the tx panhandle will rapidly deepen as it
quickly tracks northeast across the western great lakes tonight
and continue to rapidly deepen as it moves into canada Sunday.

Expecting a period of easterly gales to develop ahead of the low
this evening, except over far southern portions of the lake where
milder air over the colder lake will result in somewhat more
stable conditions. For that reason, opted to run with a small
craft advisory this evening for the easterly winds for the
nearshore water. Behind the front, look for a period of high end
southwesterly gales behind the fast moving and quickly deepening
low. Quite concerned that there will be a window, perhaps up to 6
hours long or so, of southwest storm force winds over the far
northern portions of the lake, especially toward the straits.

Strongly considered a storm watch for that area, but opted to just
introduce storm force gusts in the north for now and will let the
day shift get a look at latest guidance later this morning and
consider upgrading to a storm warning at that time. Gales will
quickly subside later Sunday afternoon and evening from south to
north with fairly quiet conditions on the lake the first part of
next week before the next storm approached later in the week.

- izzi

Lot watches warnings advisories
Il... None.

In... None.

Lm... Gale watch... Lmz740-lmz741-lmz742-lmz743-lmz744-lmz745-lmz777-
lmz779... 6 pm Saturday to 3 am Monday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WHRI2 - Waukegan Harbor, IL 13 mi43 min NNE 15 G 16 32°F
FSTI2 17 mi143 min N 18 34°F
OKSI2 21 mi143 min NNE 6 35°F
CHII2 - Chicago, IL 22 mi33 min NE 12 G 14 35°F 33°F
CNII2 25 mi23 min NNE 8 G 9.9 34°F 31°F
KNSW3 - Kenosha, WI 28 mi83 min N 11 G 13 32°F 1023.7 hPa (-1.4)
CMTI2 - 9087044 - Calumet, IL 34 mi53 min N 7 G 9.9 33°F 1022.9 hPa31°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL7 mi31 minNNE 710.00 miPartly Cloudy33°F30°F89%1024.2 hPa
Chicago, Chicago-O'Hare International Airport, IL15 mi32 minNE 910.00 miOvercast33°F28°F82%1023.5 hPa
Chicago/Waukegan Regional Airport, IL17 mi28 minNNE 68.00 miFair31°F27°F85%1024.5 hPa

Wind History from PWK (wind in knots)
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Last 24hrS7S7S7S8SW9W12W14
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W9W7W10W9W54W4NW7NW5CalmNW3N5N7NE6NE7
1 day agoNE10NE9NE8NE8NE8NE12
G18
NE8E11NE11E9E9NE14
G20
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G17
E8SE10SE9SE7E4SE5SE7SE7
2 days agoNW11NW12NW8NW10NW8N7N8N65NE6NE7NE7NE6NE7N7NE5N6NE7NE7NE9NE10NE8NE9NE9

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
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Chicago, IL (5,6,7,8)
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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.