Saturday, July22, 2017 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 5:34AMSunset 8:21PM Saturday July 22, 2017 3:37 PM CDT (20:37 UTC) Moonrise 4:44AMMoonset 7:44PM Illumination 1% Phase: Waning Crescent; Moon at 29 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- 252 Pm Cdt Sat Jul 22 2017
Tonight..Northeast winds 5 to 10 kt becoming west late. Mostly cloudy. Waves 1 ft or less.
Sunday..Northwest winds 10 to 15 kt. Slight chance of showers and Thunderstorms in the afternoon. Waves 1 ft or less.
Sunday night..North winds 10 to 20 kt. Slight chance of showers and Thunderstorms in the evening. Waves 1 ft or less building to 2 to 4 ft after midnight.
Monday..North winds 15 to 20 kt. Partly Sunny. Waves 3 to 4 ft.
LMZ740 Expires:201707230330;;662674 FZUS53 KLOT 221952 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 252 PM CDT Sat Jul 22 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>742-230330-

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 221918
afdlot
area forecast discussion
national weather service chicago romeoville, il
218 pm cdt Sat jul 22 2017

Short term
150 pm cdt
through Sunday...

quieter weather is in place with surface high pressure overhead.

The surface boundary is anchored along our southern counties.

Southerly flow ahead of the boundary and some cloud breaks should
lead to destabilization across the area. Hi resolution guidance
does still attempt to break out some convective activity in the
waa atop this boundary but it would fairly limited in coverage at
least in our area and more likely confined across central and
southern il in. Dcape and high pwats suggest a wind and heavy rain
threat.

A fairly broad mid-upper level trough will push southeast through
the great lakes on Sunday. Ahead of this trough, convection is
expected across the upper midwest this evening, with the majority
shorter term guidance weakening this activity as it nears il,
though some sprinkles or isolated showers would not be unheard of.

The associated cold front will pass through the area during the
morning into early afternoon. Convective coverage is still a bit
uncertain at this time, given the main upper forcing is north in
the less unstable air, and the cold front will largely be through
a good portion of the area in the afternoon. Some convection
remains plausible both north and ahead of the wave, so held onto
some lower chances at this time. Areas east and south stand the
best chance for isolated severe storms later in the day. Generally
speaking most times will be dry, and it will be at least a little
less muggy with dewpoints in the 60s instead of 70s.

Kmd

Long term
217 pm cdt
Sunday night through Saturday...

looking at a cooler and drier upcoming week.

An upper level wave swings overhead Sunday, and we may have
lingering showers and storms mainly along and east of i-55 Sunday
night.

Northerly winds set up Monday bringing in cooler and less humid air.

Highs Monday are forecast to be in the low 70s along the lake to
around 80 south of i-80. High pressure moves over the lake Monday
night leading to dry conditions through Wednesday morning.

Temperatures slowly climb back into the mid to upper 80s by
Wednesday.

The next chance of precip arrives Wednesday afternoon and evening in
advance of a weak low and cold front. Showers and storms linger into
Thursday. Cooler air moves in behind the cold front with highs in
the low 80s away from the lake Thursday. Another high moves over
the midwest late next week.

Jee

Aviation
For the 18z tafs...

concerns center on lake breeze arrival, and on small convective
chances.

Radar shows the lake breeze confined near the shore in northern
cook county, with some inland headway in southern cook. Movement
has been slow and conversely short term guidance has slowed the
easterly wind shift. Confidence is only medium on arrival time,
and it could be delayed, but weak pressure pattern would support
movement inland.

Initial frontal boundary is south of the terminals in an area
currently capped but likely to lose the cap later this afternoon.

Some convection is possible but forcing is limited, and expected
to be well south. This activity may strengthen late tonight but
still remain south. There is a cold front across mn and it will
move close to the area late tonight. Some weakening showers may
impact area near the wi border overnight but chances locally are
small. The front will pass southeast through the area in the
morning. With the main upper forcing well north expected shower or
storm coverage to be limited and have kept the tafs dry. Winds
shift to NW behind the front.

Kmd

Marine
217 pm cdt
a baggy pressure field will lead to a light and variable wind field
today. The low pressure system over minnesota will pass over the
northern end of the lake early Sunday morning before reaching the
eastern great lakes Sunday night. Winds become north behind the low
and increase to 15-25 kt Sunday night into Monday morning.

High pressure builds over the lake Monday evening and continues east
Tuesday. Winds become south behind the high and 15-25 kt winds are
possible over the northern end of the lake Tuesday night.

Another weak low and cold front swing down the lake Wednesday night
with winds becoming north behind the front.

Jee

Lot watches warnings advisories
Il... None.

In... None.

Lm... None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
45174 9 mi27 min SSE 5.8 G 7.8 74°F 73°F1 ft71°F
WHRI2 - Waukegan Harbor, IL 13 mi57 min ESE 2.9 G 5.1 76°F
FSTI2 17 mi97 min ESE 5.1 75°F
OKSI2 21 mi97 min ESE 2.9 77°F
CHII2 - Chicago, IL 22 mi47 min SE 9.9 G 11 75°F 71°F
45177 22 mi157 min 76°F
CNII2 25 mi37 min 76°F
KNSW3 - Kenosha, WI 28 mi37 min NE 2.9 G 6 70°F 1009.5 hPa (+0.0)
JAKI2 30 mi97 min ESE 2.9 74°F
CMTI2 - 9087044 - Calumet, IL 34 mi49 min ENE 7 G 9.9 74°F 1009.6 hPa71°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 mi45 minW 710.00 miOvercast83°F71°F67%1009.4 hPa
Chicago, Chicago-O'Hare International Airport, IL15 mi46 minNNW 710.00 miMostly Cloudy84°F69°F61%1008.9 hPa
Chicago/Waukegan Regional Airport, IL17 mi42 minN 510.00 miMostly Cloudy79°F72°F79%1008.4 hPa

Wind History from PWK (wind in knots)
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Last 24hrE5CalmSE8E3E5E5SE5E5SE11S8S7NW4S13S17
G25
N9
G16
W64CalmW564SW6W8W7
1 day agoE7E5E4E4SE4SE4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE3SE7S8SE7SE7SE8E5SE7
2 days agoNE9NE8E44NE4NE3NW11
G29
S3NW9SW7W5S5W6S33S5SE20S13S16
G20
SW9SW10W10W10NW6

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 (16,3,4,5)
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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.