Sunday, April18, 2021
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Marine Weather and Tides
Niles, IL

Version 3.4
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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 6:03AMSunset 7:37PM Sunday April 18, 2021 4:13 PM CDT (21:13 UTC) Moonrise 10:06AMMoonset 1:09AM Illumination 44% Phase: First Quarter Moon; Moon at 7 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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LMZ741 Expires:202104190315;;756344 Fzus53 Klot 181955 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 255 Pm Cdt Sun Apr 18 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>742-190315- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 255 Pm Cdt Sun Apr 18 2021
Tonight..Southeast winds 10 to 15 kt becoming southwest 10 to 15 kt this evening, then increasing to 15 to 20 kt late. Mostly cloudy then becoming party cloudy this evening. Waves 1 ft or less.
Monday..West winds 10 to 20 kt becoming northwest 10 to 15 kt late morning. Chance of rain through the day. Waves 1 ft or less.
Monday night..Northwest winds 10 to 15 kt becoming north after midnight. Chance of rain through the night. Chance of snow after midnight. Waves 1 ft to 3 ft to 2 to 4 ft after midnight.
Tuesday..Northeast winds 10 to 20 kt. Chance of rain and snow. Waves 2 to 4 ft.
LMZ741


7 Day Forecast for Marine Location Near Niles, IL
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location: 42, -87.81     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 182026 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 326 PM CDT Sun Apr 18 2021

SHORT TERM. 304 PM CDT

Through Monday .

Aside from a greater coverage in cloud cover it has been a fairly pleasant day so far with temperatures warming to around 60 degrees. Areas along the immediate lakeshore are still holding steady in the lower 50s.

Light radar echos have expanded in coverage over the local area this afternoon. Large dew point depressions at the surface are keeping this activity mainly virga showers. The inverted-v shaped soundings would support sporadic gusty winds under any of the more persistent showers/virga showers through the afternoon. Some of the showers south of I-80 across east central Illinois are more persistent where some light rain may be reaching the ground tied to a vort max moving across the area. Although the potential appears low, a lightning strike or two cannot be entirely ruled out. This activity will diminish in coverage toward sunset.

Overnight temperatures will stay warmer than they have been the past few nights thanks to persistent southwest flow with lows in the lower to mid 40s areawide. A low level jet develops out ahead of an approaching cold front which could result in some sporadically gusty winds overnight toward daybreak. The cold front is then progged to push across the area mid to late morning Monday with light rain expanding across the area behind the front, especially for areas along and north of I-80. Will note that there remains a fair amount of variability in the timing of the front and how long the light rain persists over the area. Temperatures are expected to warm into the 50s generally north of I-80, with highs potentially still reaching 60 to the south before the front moves through. Additional details on the Monday evening into Tuesday snow potential will be included in the Long Term Discussion below.

Petr

LONG TERM. 326 PM CDT

Monday night through Sunday .

The continued potential for a late season snow event Monday night through Tuesday evening continues to be the primary focus during the period. Global forecast and ensemble guidance continues to favor a bit more of a southern track and placement of the potently area of heavier snow on Tuesday. However, some of the HiRes guidance is still farther north with the axis of heavy snow. While the Global and ensemble solutions likely have a better handle on this event, there is nonetheless continued lower confidence in the forecast details. Following the snow event, expect a likely hard freeze Tuesday night as temperatures look to fall into the 20s.

A strong cold front will move southward across the area Monday, with much colder air expected to shift southward over the area into Monday night. A ribbon of light post-frontal precip primarily driven by low-level dynamics will drift south through the night into Tuesday morning. While any potential precip looks to be fairly light, steeper mid level lapse late Monday night into Tuesday morning above continuous 40-50kt 700 hPa winds slightly oblique to the frontal boundary may support transient narrow f-gen bands. Thermo profiles support primarily snow mixed with some rain, favoring all snow within any modest banded precip features. It is unlikely precip rates will be strong enough for any appreciable accumulation during this time, but slushy accumulations of a few tenths of an inch on elevated or grassy surfaces north of I-80 and west of the Chicago metro are possible late Monday night into Tuesday morning.

The main time period for potential heavier precipitation and accumulating snow looks to be late Tuesday morning through early evening, with the primary focus looking to be south of I-55. This period of potential heavier snow will be driven by a developing surface low over the Mid-Mississippi Valley Tuesday afternoon. The surface low is then expected to strengthen Tuesday night into Wednesday as it shifts northeastward over the Ohio Valley and into New York. This suggests that some of the heaviest precipitation may not fully develop until Tuesday evening as the snow is ending in our area. Nevertheless, some accumulating snow still looks possible across the area, with perhaps a couple inches over my southeastern areas, in closer proximity to the strongest baroclinic zone and area of low to mid level frontogenesis. Some minor accumulations of an inch or less are still possible over northern IL, especially on grassy and elevated surfaces.

Once the snow ends over my southeastern areas Tuesday evening, expect the entire area to see a good freeze Tuesday night. Temperatures will likely fall into the mid to upper 20s in most areas outside the immediate city of Chicago. Those with agricultural interests should prepare now for potential impacts.

Wednesday through Friday: A secondary wave rotating around the backside of the departing trough may bring additional scattered rain and snow showers Wednesday afternoon. Temps will return to more seasonable levels in the upper 50s to low 60s late this week into the weekend amid more unsettled weather late Friday through Saturday.

KJB/Kluber

AVIATION. For the 18Z TAFs .

Primary Forecast Concerns: * Breezy west winds today with spotty showers possible this afternoon * Cold front moves through Monday morning with light rain and MVFR cigs possible behind the front

West to southwest winds today are beginning to gradually pick up after staying rather light and variable through much of the morning hours. Occasionally stronger gusts to 18-20 kt will still be possible through the afternoon before easing toward sunset.

6000-8000ft strato-cu is beginning to expand in coverage early this afternoon with a few spotty showers also trying to develop. The shower coverage is expected to stay low enough to preclude even a formal VCSH mention at this time. A lightning strike or two cannot be entirely ruled out, but the better thunder potential remains well south of the terminals.

A 30-35kt low level jet develops early Monday morning ahead of an approaching cold front which could result in the potential for more gusty southwest winds to mix down to the surface prior to sunrise. The cold front then moves through Monday morning with light rain and MVFR cigs likely behind the front. There remains some variability in timing of the frontal passage and how long the light precipitation lingers over the terminals. For now have opted to maintain a precip mention and MVFR cigs through the end of the TAF period.

Petr

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
FSTI2 9 mi133 min 38°F
OKSI2 12 mi133 min ESE 5.1 G 8.9 57°F
CHII2 - Chicago, IL 14 mi43 min SE 13 G 14 51°F 37°F
CNII2 15 mi28 min SE 2.9 G 8 53°F 41°F
CMTI2 - 9087044 - Calumet, IL 24 mi55 min NE 6 G 7 1010.8 hPa
WHRI2 - Waukegan Harbor, IL 25 mi73 min S 8 G 8.9 48°F
KNSW3 - Kenosha, WI 41 mi73 min S 14 G 18 46°F 1011.2 hPa (-1.7)
BHRI3 - Burns Harbor, IN 43 mi33 min ENE 2.9 G 4.1 53°F 1011.9 hPa

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago-O'Hare International Airport, IL5 mi22 minWSW 1110.00 miMostly Cloudy62°F28°F28%1010.5 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL9 mi21 minW 10 G 1710.00 miOvercast63°F25°F24%1011 hPa
Chicago, Chicago Midway Airport, IL15 mi20 minSW 810.00 miOvercast62°F27°F26%1011 hPa
Chicago / West Chicago, Dupage Airport, IL24 mi21 minSW 8 G 1710.00 miMostly Cloudy61°F32°F34%1010.6 hPa

Link to 5 minute data for KORD

Wind History from ORD (wind in knots)
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Last 24hrE6NE10NE7NE6NE5NE5CalmSW3SW4SW4SW3CalmCalmCalmCalmS34S4W4SW5SW9SW10
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1 day agoE9E10E7E6NE8SE4SE4CalmN4N4N6N6N4N6N7N11N65NE6N11NE10NE9E7NE6
2 days agoNE5NE9E6E4E4CalmSW4SW4W4W3W5W6NW8NE10N5--N5N3NE4Calm4E10E7E8

Tide / Current Tables for
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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.
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