Thursday, October28, 2021
Privacy Policy
L-36.com

Marine Weather and Tides
Libertyville, IL

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:19AMSunset 5:51PM Thursday October 28, 2021 4:32 PM CDT (21:32 UTC) Moonrise 11:50PMMoonset 2:30PM Illumination 45% Phase: Third Quarter Moon; Moon at 23 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- 345 Pm Cdt Thu Oct 28 2021
.small craft advisory in effect through Saturday evening...
Tonight..Northeast winds 15 to 20 kt increasing to 30 kt overnight. Rain. Waves 4 to 7 ft occasionally to 9 ft building to 6 to 9 ft occasionally to 12 ft late.
Friday..Northeast winds to 30 kt. Occasional gale force gusts. Rain. Waves 7 to 10 ft occasionally to 13 ft building to 8 to 11 ft occasionally to 14 ft in the afternoon.
Friday night..Northeast winds to 30 kt. Rain in the evening, then chance of rain after midnight. Waves 8 to 11 ft occasionally to 14 ft.
Saturday..North winds 15 to 25 kt diminishing to 15 to 20 kt. Chance of rain. Waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to 7 ft occasionally to 9 ft in the afternoon.
LMZ740 Expires:202110290315;;930391 FZUS53 KLOT 282045 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 345 PM CDT Thu Oct 28 2021 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 Libertyville, IL
   Hourly   EDIT   Help
location: 42.29, -87.95     debug


Area Discussion for - Chicago, IL
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS63 KLOT 282017 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 317 PM CDT Thu Oct 28 2021

SHORT TERM. 315 PM CDT

Through Friday night .

A 992 mb surface low centered over southern Missouri continues its slow movement towards the east-northeast, with light to moderate rain rotating around it, especially towards its northeast where dynamic support is stronger (upper level jet support and diffluence). Although surface winds are from the east, winds become more southeasterly with height, and that is helping move rain over the area. Rain amounts have mainly been light so far, and upstream too, though a couple reports around one half inch in eastern Illinois. Showers will continue late this afternoon into this evening. There may be some diminishing and light fog in the far south later tonight as the low shifts into the Lower Ohio River Valley, but otherwise rain showers are likely to prevail. This looks to be even a steady rain over parts of northeast Illinois later tonight and continuing into Friday morning, where lake enhancement will be a factor due to onshore flow and relatively warm lake temperatures inducing lake-effect instability. This could result in some widespread slower conditions during the Friday morning commute due to the widespread rain.

As the low moves closer, winds will pick up due to the tightening surface gradient. Gusts up to 35 to 40 mph will be possible starting mid morning and into Friday evening, especially near the lake front. This strong northeasterly flow will create high waves along the Lake Michigan shore of Illinois especially, with regular wave heights on Friday as high as 10-11 ft tonight. This is less than the waves with the storm earlier this week, however still may end up resulting in spotty issues of minor flooding or spray from the lake.

Rain continues throughout Friday and into Friday night but likely focuses more in the eastern CWA. With still continued lake enhancement, it is expected that far northeast Illinois, including the Chicago metro, will see the most rain with this event. We have inched up our forecast rainfall amounts with some locations receiving over 1.25 inches looking more likely. Cannot rule out 2 or even a little over, considering the 12Z HREF probability matched mean (PMM) guidance indicates that for an event total in northeast Illinois. This is likely not to be enough for flooding, but may present some ponding issues during the morning commute.

Cloud cover will keep temperatures fairly steady over the next 36 hours or so, with temperatures remaining in the low to mid 50s, including lows Friday morning. Winds will become more northerly by Saturday morning, so although we'll still have widespread cloud cover, temperatures will be a bit cooler Saturday morning, with lows in the upper 40s/near 50.

BKL/MTF

LONG TERM. 315 PM CDT

Saturday through Wednesday .

The key messages in the extended period include 1. pleasant weekend weather in store for Halloween and 2. consensus that we are entering a cooler than normal pattern bringing more widespread sub-freezing temps to the area and possibly our first snowflakes of the season.

The closed upper low responsible for our late week rain showers will be well on its way east of the area by Saturday. North northeast winds will persist on the back side of the low, however, which could bring some lingering lake effect showers through the morning hours across northeast Illinois near the lake then trending east into northwest Indiana over the afternoon. A cold front does push through the area sometime Sunday morning which will bring some breezy northwest winds and limit warming only into the mid-upper 50s in the afternoon. Dry conditions are still on tap on Sunday which should make for a pleasant Halloween. Temperatures do begin to cool down after sunset with mid-upper 40s in the city and the lower 40s in the suburbs expected in the evening for Trick-or-Treat time.

Beyond the weekend, cold air from Canada continues to dive southward across the Upper Midwest. This will bring below normal temperatures across the area for the remainder of the work week with high temperatures only in the 40s. In turn, temperatures overnight will begin to dip into the lower 30s with more widespread sub-freezing temps becoming increasingly likely, especially across more rural areas outside of the metro later in the week. As to be expected when temperatures dip below freezing, we could very well see our first snowflakes of the season. At this time there remains some variability and thus uncertainty with the timing and placement of various mid-level shortwaves rounding the base of the upper trough, so for now will simply maintain slight chances for light rain/snow off and on during the Monday through Thursday period.

Petr

AVIATION. For the 18Z TAFs .

The primary aviation forecast concerns for ORD and MDW are:

- Rain becoming prevailing by mid afternoon and increasing in intensity this evening, with the likelihood of frequent IFR visibilities of 2-3 SM

- IFR ceilings becoming more frequent and eventually prevailing at some point this evening persisting into Friday morning

- East winds becoming northeast by Friday morning and gusty throughout the day Friday

Deteriorating conditions will be seen across the TAF sites through this afternoon and evening as rain showers become more prevalent. This looks to be even more of just a rain tonight into Friday morning, especially at the Chicago TAF sites as lake enhancement to the rain showers occurs. While visibility will likely fluctuate at times to MVFR or even briefly IFR later this afternoon/early this evening, the most likely time for IFR visibility in rain looks to be after 01Z or so and extending into the Friday morning rush time. Confidence is moderate to high in the rain trends, and that there should not be any thunder at the airfields or even over the TRACON area (worst case some sneaks into the south tonight).

As the low pressure system causing the rain and low clouds moves from the Lower Ohio River Valley early Friday morning to Ohio Friday afternoon, the pressure gradient will tighten for stronger winds and move backed in direction. The direction is likely to not be any more backed than 020 degrees. How strong these northeast winds will be has some uncertainty due to the unstable layer upstream over the lake and the prevailing low cloud bases / mixing heights. There is potential for a few gusts to exceed 30 kt namely in the afternoon. Confidence in the winds is medium.

Some improvement in ceilings may occur Friday afternoon at Chicago sites and is likely at Rockford. The rain will likely truly become more showery with some breaks at times. Winds will remain gusty.

MTF

MARINE. 315 PM CDT

Another strong low pressure system will move eastward across the middle of the country over the next 36 hours, though this one further south than the earlier week one. The pressure gradient and lower atmospheric winds will be less over the area with this. With instability still over the lake, the potential for some 35 kt gales on Friday is there, namely into the Illinois nearshore. Confidence is high that if a gale ends up occurring, it would not exceed a mid 30 kt gale.

MTF

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . Small Craft Advisory . IL nearshore waters until 7 PM Saturday.

Small Craft Advisory . LMZ743-LMZ744-LMZ745 . 1 AM Friday to 7 PM Saturday.



Visit us at weather.gov/chicago

Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/NWSChicago www.twitter.com/NWSChicago www.youtube.com/NWSChicago


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 9 mi92 min E 14G15
45186 10 mi32 min 56°F 57°F4 ft
45187 17 mi32 min NE 9.7G12 57°F 57°F3 ft
45174 19 mi32 min ENE 14G18 57°F4 ft1000.4 hPa (-0.3)
KNSW3 - Kenosha, WI 22 mi32 min E 9.9G12 56°F 1002 hPa (+0.0)
OKSI2 31 mi92 min E 8.9G13 56°F
CHII2 - Chicago, IL 33 mi42 min ENE 22G23 55°F 53°F
CNII2 35 mi32 min ENE 17G18 54°F 50°F
JAKI2 40 mi92 min E 17G21 56°F
CMTI2 - 9087044 - Calumet, IL 44 mi62 min NE 12G16 999 hPa

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
E9
E8
G11
E8
G14
E14
G17
E17
E8
G14
E12
G16
E9
G13
E12
G15
SE11
G15
E9
G17
E11
G14
E10
G14
E12
G17
E13
G17
E11
G15
E10
G16
E13
G18
E11
G16
E11
G17
E11
NE7
G10
NE11
NE12
G18
1 day
ago
N5
G8
N4
G8
N8
G11
N7
G12
N7
G10
N7
G11
N8
G12
NE7
G11
NE4
G7
E6
S4
S4
S3
E6
G9
S4
SE4
G7
SE6
G9
S6
G9
SE5
G9
SE7
G10
E7
NE10
G13
E8
G11
NE9
2 days
ago
N13
G23
N14
G26
N14
G20
N14
G22
N12
G21
N14
G21
N14
G22
N11
G15
N13
G18
N10
G13
N10
G15
N12
G16
N10
G14
N10
G14
N7
G16
N4
G10
N6
G9
NW5
N6
G9
N6
G10
NE6
N5
G9
N7
G11
N5
G11

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL10 mi37 minNE 57.00 miLight Rain55°F51°F87%1001.1 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL13 mi40 minNE 84.00 miLight Rain Fog/Mist55°F51°F87%1001.2 hPa
Kenosha, Kenosha Regional Airport, WI21 mi39 minENE 610.00 miLight Rain56°F50°F81%1001.9 hPa
Chicago, Chicago-O'Hare International Airport, IL22 mi41 minENE 123.00 miRain Fog/Mist54°F51°F90%1000.2 hPa

Link to 5 minute data for KUGN

Wind History from UGN (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 24hrE9SE4E7E9E10
G19
SE10
G18
SE10
G16
SE8
G19
SE7SE9E9SE8E7E7E8E10
G15
E12
G22
E10E11
G18
E8E11
G16
E8E8NE5
1 day agoNE6NE6NE4NE3NE3NE5NE4NE4NE50E5E5E50SE3SW30S7SE9S10SE13
G17
SE11
G19
SE12E10
2 days agoN13
G24
N9
G22
N8N9
G21
N7
G17
NW5NE9
G17
NE8
G17
NW4NW4NW4NW5NW5N4NW3NW6NW6N6N8N6
G16
6NE9
G15
NE9NE7

Tide / Current Tables for
   EDIT   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS Local Image of    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
Link to Loop

Other links: GEOS-West     Contential US     Full GOES-East
Ground Weather Radar Station




Please read website Cookie, Privacy, and Disclamers by clicking HERE.