Tuesday, May23, 2017 L-36.com


Marine Weather and Tides
North Chicago, IL

Version 3.4
What's New / NOTES
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 5:20AMSunset 8:16PM Tuesday May 23, 2017 7:33 PM CDT (00:33 UTC) Moonrise 4:13AMMoonset 5:40PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 322 Pm Cdt Tue May 23 2017
Tonight..Northeast winds 10 to 20 kt. Rain showers and a chance of Thunderstorms in the evening, then showers likely after midnight. Waves 1 to 3 ft building to 3 to 5 ft occasionally to 7 ft.
Wednesday..North winds 15 to 25 kt. Chance of showers. Waves 3 to 5 ft occasionally to 7 ft building to 3 to 6 ft occasionally to 8 ft in the afternoon. A small craft advisory will likely be needed.
Wednesday night..North winds 15 to 25 kt. Chance of showers. Waves 3 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft occasionally to 7 ft after midnight. A small craft advisory will likely be needed.
Thursday..North winds 10 to 20 kt. Slight chance of showers in the morning. Waves 3 to 5 ft occasionally to 7 ft. A small craft advisory will likely be needed.
LMZ740 Expires:201705240315;;094774 FZUS53 KLOT 232022 NSHLOT NEARSHORE MARINE FORECAST NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 322 PM CDT TUE MAY 23 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>742-240315-

7 Day Forecast for Marine Location Near North Chicago, IL
   Hourly   EDIT   Help
location: 42.35, -87.79     debug


Area Discussion for - Chicago, IL
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 klot 240008
afdlot
area forecast discussion
national weather service chicago romeoville, il
708 pm cdt Tue may 23 2017

Short term
240 pm cdt
through Wednesday...

deep low pressure will continue to sink south from the corn belt
to the lower mississippi valley Thursday. The first in a series of
waves ahead of the low will shift northeast through the flying
area this afternoon. Expect an increase in shower coverage and
intensity over the coming hours with the enhanced lift from this
wave, with some moderate showers due to a narrow moisture plume
precipitable water values in excess of 1 inch there is a small
pocket of instability across north central illinois into adjacent
wisconsin where the best near term chances for embedded
thunderstorms exists. With the upper low shifting farther east,
cold temperatures aloft will allow some of this weak instability
to shift over northeast illinois and northwest indiana. This
combined with the vort MAX still warrants a low chance thunder
mention. Rap forecast of non-supercell tornado threat are still
low but low level CAPE does exist in very localized pockets near
the cold frontal boundary where low level vorticity is enhanced,
and with some limited clearing there is still a limited severe
weather concern for gusty winds as the vort MAX encounters the
front this afternoon.

As the low sinks south tonight into Wednesday, expect continued
waves of showers as additional energy spreads northward ahead of
the low, with coverage likely decreasing though possibly becoming
more narrowly focused on eastern half of the area. There could be
a modest rainfall axis that will setup tomorrow, with the i-55
eastward corridor still favored, but still challenging to pinpoint
at this time. A low thunder chance exists across east central il
and northwest in as well. Elsewhere just expect occasional showers
and cool cloudy conditions.

Kmd

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

looking ahead through the extended part of the forecast, there are
not many periods without a mention of rain chances. We transition
away from one upper low late this week but into another this
weekend, with only weak ridging in between. However, despite the
frequent chances for rainfall, it does not appear that each day will
be a washout. In general the showers should be to some extent
diurnally driven under a cyclonic upper level circulation, which
means at least the early part of most days could be favorable for
outdoor activity.

The most likely period for a break in activity appears to be
Thursday afternoon into the early part of Friday as the first system
moves out and cooler, drier air moves in with northerly surface
flow.

Warmer and more humid air returns for Friday and Saturday. The
biggest uncertainty for this forecast period comes late Friday and
into the weekend, with the deterministic GFS and ECMWF in poor
agreement with the timing of an upper wave and surface low pressure
system moving through the southern great lakes. Presently the much
faster ecm... As well as the gem... Brings this system through late
Friday and leaves behind just some light activity for Saturday. The
gfs is about a day slower and shows widespread rainfall Saturday
afternoon and evening. Both have a stationary front extending east
from a larger center of low pressure across oklahoma early Friday.

They both also depict a wave forming along the front as the one that
pushes through the local area. Given the proximity of the boundary
and the uncertainty with the movement of the surface wave, will
continue to carry increasing precip chances late Friday, especially
south, and again Saturday afternoon and evening for a larger portion
of the area.

Models are in somewhat better agreement in depicting another break
in the weather early Sunday, then a large upper low becoming parked
over the great lakes from late in the weekend through at least
midweek. This would support ongoing widespread chances of rainfall,
especially during periods of afternoon heating.

Lenning

Aviation
For the 00z tafs...

the main concerns are precipitation trends, winds and cig vsby
trends. A slow moving upper level low pressure will continue to
bring waves of showers at least into Wednesday morning which will
be capable of reduced visibility. The more frequent or prevailing
rain shower activity should on the large scale focus over the
eastern terminals, with isolated to at times scattered showers
near rfd. The wind field is quite light with a light pressure
gradient but as weak low pressure organizes south of area tonight,
tendency should be for gradually increasing northeast winds. By
mid-day Wednesday and likely through Wednesday evening, the
position of stronger low pressure off to the east will support
gusty north-northeast winds with gust speeds forecast of 18-20 kt
and potential for up to 25 kt at eastern terminals.

Regarding cig trends, the most widespread low clouds are over
wisconsin from mke and to the north and northwest of there. Much
of the guidance, but not all, brings these low clouds southward
tonight with time and then lingers it into Wednesday. Am concerned
that this a bit overdone, so limited the duration of ifr in the
tafs, leaning on probabilistic ensemble guidance for trend toward
improvement by the mid-late morning through the afternoon.

Confidence is low- medium with cig trends overall. If the low
clouds do scatter as anticipated, some guidance hints at them
spreading back southwest Wednesday evening. The lighter wind and
moist regime overnight into Wednesday morning may support vsby
reductions in br outside of shower activity.

Castro

Marine
309 pm cdt
low pressure dropping from wisconsin into indiana tonight and then
moving to ohio Wednesday evening will support northeast winds
across the lake through Thursday night. Winds are lighter and more
variable Friday and Saturday under the influence of a ridge of
weak high pressure moving over the lake.

Lenning

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
WHRI2 - Waukegan Harbor, IL 1 mi54 min SSW 2.9 G 4.1 52°F
45174 16 mi34 min 1.9 G 3.9 52°F 53°F51°F
KNSW3 - Kenosha, WI 17 mi34 min S 8 G 9.9 53°F 1006.4 hPa (-0.4)
FSTI2 27 mi154 min ESE 1.9 54°F
OKSI2 32 mi154 min ENE 2.9 57°F
CHII2 - Chicago, IL 32 mi44 min ENE 4.1 G 5.1 55°F 54°F
CNII2 35 mi34 min E 4.1 G 6 55°F
JAKI2 41 mi154 min NNE 2.9 58°F
CMTI2 - 9087044 - Calumet, IL 45 mi52 min NE 2.9 G 4.1 56°F 1006 hPa55°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 46 mi104 min SSE 1.9 G 1.9 49°F 45°F1006.9 hPa (-1.0)49°F
MLWW3 - Milwaukee, WI 48 mi44 min SE 7 G 8 51°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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
7
PM
Last
24hr
SW9
G13
SW10
G14
SW9
G14
SW10
G15
S7
G10
SW6
G13
S10
G13
S6
G9
S6
G12
S8
G13
SW7
S8
G11
SW7
G13
SW6
G11
SW5
G8
S4
S4
NE6
E6
NE4
NE6
NW3
NW1
G4
NE6
1 day
ago
SW6
G11
SW7
G13
SW8
G12
SW7
G10
SW6
G16
SW7
G13
SW6
G12
SW6
G12
SW6
G10
SW4
G8
SW5
S9
SW9
G12
SW7
G11
SW10
G16
S12
G18
SW12
G17
SW9
G16
S12
G16
SW12
G17
SW14
G19
S14
G17
SW10
G18
SW13
G19
2 days
ago
SE6
G9
SE3
SE4
G7
E4
S3
S5
SE5
G8
S4
S5
S5
G8
W6
G16
SW4
G8
SW6
G11
SW5
G12
W5
G14
SW8
G16
SW7
G15
S10
G17
SW8
G17
SW11
G21
SW6
G13
SW6
G14
SW10
G16
SW10
G19

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL6 mi39 minN 02.50 miLight Rain Fog/Mist55°F53°F93%1005.9 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL18 mi42 minN 08.00 miLight Rain56°F55°F97%1006.3 hPa
Kenosha, Kenosha Regional Airport, WI18 mi41 minSSE 66.00 miLight Rain Fog/Mist57°F53°F87%1006.4 hPa

Wind History from UGN (wind in knots)
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
7
PM
Last 24hrSW14
G25
SW14
G20
SW16
G22
SW14SW12SW5SW9SW6SW8SW53SW9
G14
SW11SW9
G15
SW9SW9S11SW8SE7SE4SE7S8SE6Calm
1 day agoW7SW8
G17
SW10
G16
SW8
G16
SW8
G15
SW6
G15
5SW665SW56SW7SW10
G17
6
G15
SW13
G22
SW17
G22
SW16
G24
SW10
G19
3SW12
G18
SW7SW16
G24
SW19
G27
2 days agoSE5E5E5E6SE5E3CalmCalmCalmSW4SW76W8SW7
G16
SW10
G19
SW12
G18
W7
G17
W11
G18
SW15
G23
SW10
G20
W9
G19
SW12
G20
W8
G18
W8

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 (20,4,5,8)
      (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.