Thursday, October19, 2017 L-36.com


Marine Weather and Tides
Elmhurst, 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 7:08AMSunset 6:04PM Thursday October 19, 2017 4:39 PM CDT (21:39 UTC) Moonrise 6:47AMMoonset 6:26PM Illumination 0% Phase: New Moon; 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
    EDIT      (on/off)   Help
LMZ741 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 253 Pm Cdt Thu Oct 19 2017
Tonight..East winds 5 to 10 kt becoming southeast early this evening, and then south 10 to 15 kt after midnight. Clear. Waves around 1 ft.
Friday..South winds 10 to 15 kt increasing to 10 to 20 kt by early afternoon. Sunny. Waves 1 to 3 ft.
Friday night..South winds 10 to 20 kt. Partly cloudy. Waves 1 to 3 ft.
Saturday..South winds 15 to 25 kt. Partly Sunny. Waves 2 to 4 ft building to 3 to 5 ft in the afternoon. A small craft advisory will likely be needed.
LMZ741 Expires:201710200415;;101816 FZUS53 KLOT 191953 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 253 PM CDT Thu Oct 19 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>742-200415-

7 Day Forecast for Marine Location Near Elmhurst, IL
   Hourly   EDIT   Help
location: 41.89, -87.94     debug


Area Discussion for - Chicago, IL
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 klot 192004
afdlot
area forecast discussion
national weather service chicago romeoville, il
304 pm cdt Thu oct 19 2017

Short term
140 pm cdt
through tonight...

a quiet night ahead with the high pressure ridge shifting from
overhead this afternoon to east of the area by daybreak. The air
mass is quite dry with 40-45 degree temperature dew point spreads
providing relative humidity of 15-25 percent, especially
along north of i-80. The light winds, dry air, and clear sky on an
october night are a recipe for strong evening radiational
cooling, and have sharpened the slope of the early evening
temperature drop in the hourly forecast. The 9-10 pm readings
should already be down to within 5 degrees or so from the
nighttime lows. A slight south wind late will ease the rate of
cooling with lows forecast in the mid-upper 40s in outlying
locations, to the lower to mid 50s in the metro.

Mtf

Long term
302 pm cdt
Friday through Thursday...

quiet dry weather continues Friday, with lingering boundary in
place expected to be north of the CWA at the start of the period.

Warmer air pushing across the region and sunny skies on Friday
will support above normal temps well into the 70s. Have maintained
similar forecast of mainly upper 70s, but could see some
locations rising to around 80 degrees. Southerly flow should help
keep conditions warm near the lake, but could see some slight
eastward component developing later in the day over far northeast
illinois. Dry and above normal temps continue Friday night and am
still expecting a system to move across the region this weekend
and bring the next chance of precip.

No big changes with precip chances at this time, however, it does
appear as if guidance is struggling with the evolution of the
overall large scale pattern. This is more evident later in the
weekend into early next week though. Most of Saturday should
remain dry but with a stray light shower still not out of the
question over the far western CWA in the afternoon. This is a very
low chance though. Strongest forcing associated with approaching
upper level trough and surface trough boundary doesn't arrive
until Saturday night, with most locations still staying dry for
much of the evening. This forcing along with a likely strong llj
focused across the region, should support a decent precip shield
to move across the CWA late Saturday night into Sunday morning and
have continued higher pops. Developing instability axis to the
west of the CWA on Saturday does appear to shift east Saturday
night, with thunder still a possibility. An axis of higher
dewpoint air and this instability will support this possibility of
thunder and have maintained mention of thunder over much of the
area. With the mid upper level trough axis still pushing through
the area on Sunday, will likely see precip now linger across much
of the CWA through midday.

On the backside of this system is when guidance really starts to
struggle, and have lower confidence going into early mid next
week. Despite this variability, a cooler pattern with periods of
wet weather still appear to be on track as much of the CONUS will
see a large upper level trough low in place.

Rodriguez

Aviation
For the 18z tafs...

few to no concerns for aviation-related weather through Friday,
with the one possibility being gusty winds on Friday afternoon
near due south in direction.

A surface high pressure ridge over the area this afternoon will
want to keep the winds light and variable. A lake breeze pushing
inland in northeast illinois should reach ord around 19z and
provide a more consistent northeast wind, though speeds will
likely remain at or below 7 kt. The light winds will turn
southeast this evening and then south early Friday morning. Deep
mixing in the dry air mass within a tighter pressure gradient will
support gusts Friday afternoon. Some of these should near 20 kt.

The confidence in the wind direction being near due south is
high.

Mtf

Marine
302 pm cdt
lighter winds in place across the entire lake today, as gradient
has generally relaxed. This is most noticeable across the south
half where surface ridge axis has moved overhead. Across the north
half, fairly tight gradient still in place and allowing for
slightly elevated winds to persist. However, only anticipate these
winds to 30 kt to only last through this afternoon and then
diminish back towards the 15 to 25 kt range. Southerly winds
expected to be in place over the entire lake through much of the
weekend ahead of approaching surface trough front. Expect winds to
increase back to 30 kt over the open waters and initially only
for the north half, but will see this trend observed over the
south half. Although currently not forecasting gales, am
monitoring the potential for gales late Saturday into Saturday
night mainly over the north half. Across the nearshore waters,
conditions hazardous for small craft are again possible by this
weekend.

Rodriguez

Lot watches warnings advisories
Il... None.

In... None.

Lm... None.

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
OKSI2 17 mi100 min ESE 4.1 62°F
FSTI2 17 mi100 min ESE 7 60°F
CNII2 18 mi40 min E 4.1 G 7 61°F 40°F
CHII2 - Chicago, IL 20 mi50 min ESE 8 G 8 61°F 41°F
JAKI2 21 mi100 min ESE 4.1 61°F
45174 23 mi30 min SE 7.8 G 9.7 59°F 58°F1 ft45°F
CMTI2 - 9087044 - Calumet, IL 24 mi52 min ENE 6 G 7 60°F 1021.4 hPa44°F
WHRI2 - Waukegan Harbor, IL 33 mi60 min S 8 G 8.9 62°F
BHRI3 - Burns Harbor, IN 45 mi39 min NE 5.1 G 6 61°F 1022.4 hPa
KNSW3 - Kenosha, WI 49 mi40 min S 12 G 13 58°F 1021 hPa (-0.7)

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
Last
24hr
S10
G15
S10
G14
S7
G11
S8
G11
S9
G14
S10
G14
SW9
G13
SW9
G13
SW8
G12
SW8
G13
SW5
G11
SW6
G10
SW5
SW5
SW3
SW3
NW4
NW8
G11
N7
G10
N6
NE4
NE5
NE5
E5
G8
1 day
ago
SW12
G15
S7
G10
S8
G11
S8
G11
S8
G12
S8
G11
S8
G12
S7
G10
S6
G10
S5
S4
S6
S5
S6
G10
S6
S6
S8
G11
S10
G14
S8
S11
G17
S13
G20
S12
G16
S14
G19
S10
G18
2 days
ago
SW6
G10
SW3
G6
SW3
S1
S1
S4
S4
SW3
G7
S6
S7
S7
S8
SW8
G12
SW9
SW10
G13
S11
G16
S11
G15
S12
G16
SW9
G13
SW12
G16
S14
G19
S15
G20
S13
G18
SW8
G12

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago-O'Hare International Airport, IL7 mi49 minE 910.00 miMostly Cloudy67°F24°F20%1021.2 hPa
Chicago, Chicago Midway Airport, IL12 mi47 minESE 510.00 miMostly Cloudy67°F23°F19%1021.5 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL15 mi48 minSE 710.00 miFair66°F25°F21%1022 hPa
Chicago / West Chicago, Dupage Airport, IL17 mi48 minS 410.00 miFair69°F33°F26%1021.1 hPa
Lewis University Airport, IL21 mi65 minSSE 310.00 miFair70°F34°F27%1021.7 hPa

Wind History from ORD (wind in knots)
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
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
Last 24hrS17S13S10S10SW13SW11SW12SW12
G17
SW11SW10SW9SW7W6W5W4NW4NW4NE6NE53NE5CalmSW3E9
1 day agoSW11
G20
SW7SW9S7SW10S9S9S9SW8SW9S9S6S6S6S6S7SW9S10SW13SW10S18
G23
S18
G24
SW14
G24
SW16
G24
2 days agoW8W6SW4SW4SW5S6SW7S4SW6SW6SW9SW8SW8SW9SW9SW11SW11SW12
G20
SW12
G20
SW17
G23
SW13
G23
SW15
G24
SW16SW14

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 (17,4,5,8)
      (on/off)   Help

Ground Weather Radar Station Chicago, IL
   (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.