Friday, March5, 2021
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Marine Weather and Tides
North Riverside, IL

Version 3.4
NOTICE
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 6:17AMSunset 5:47PM Friday March 5, 2021 8:13 PM CST (02:13 UTC) Moonrise 1:27AMMoonset 11:08AM Illumination 51% Phase: Third Quarter Moon; Moon at 22 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:202103060430;;523924 Fzus53 Klot 052055 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 255 Pm Cst Fri Mar 5 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>742-060430- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 255 Pm Cst Fri Mar 5 2021
Tonight..Northwest winds around 10 kt. Mostly clear in the evening then becoming partly cloudy. Waves 2 ft or less.
Saturday..Northeast winds 10 to 15 kt. Partly cloudy early, then becoming Sunny. Waves 1 to 3 ft building to 2 to 4 ft in the afternoon.
Saturday night..Northeast winds 5 to 10 kt becoming south after midnight. Mostly clear. Waves 1 to 3 ft.
Sunday..South winds 10 to 15 kt. Mostly Sunny. Waves 1 to 3 ft.
LMZ741


7 Day Forecast for Marine Location Near North Riverside, IL
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location: 41.84, -87.82     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 052323 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 523 PM CST Fri Mar 5 2021

SHORT TERM. 203 PM CST

Through Saturday night .

Quiet weather will continue across the area to start the weekend as stout upper-level ridging builds eastward across the Great Plains into the Mississippi River Valley. However, a few nuances primarily related to cloud cover exist in the forecast through Saturday night.

Through Saturday morning: A surface ridge centered roughly along the MN/WI line into eastern IA this afternoon will drift east through Saturday. NNW winds sometimes gusting to 20 mph this afternoon will quickly diminish with decoupling around sunset, leading to light NW winds this evening. Winds will veer NE by daybreak Saturday, but remain under 10 mph. An axis of 900-950 hPa moisture advecting SSE across Lake Superior into northern Lake Michigan is expected to continue in a loosely anti-cyclonic flow around the ridge tonight. Guidance is mixed with the potential development of lower stratus within the moisture axis this evening over central Lake Michigan, but indications are that at least some shallow stratus will advect into northeast Illinois and northwest Indiana late tonight before quickly mixing out by late Saturday morning. Additionally, while some pockets of dewpoints well into the 20s exist over the remaining snowpack across north- central Illinois, fog potential in the light wind regime tonight appears quite low as a feed of mid to upper-level clouds within faster NNW flow aloft limits nocturnal radiation.

Saturday afternoon and night: Temps during the afternoon will likely be similar to today, with highs around 40F near the lakeshore to the mid and upper 40s inland away from remaining snow cover. The western flank of the low-level ridge will continue to affect the area Saturday night, resulting in light E to SE winds with lows generally in the 20s area-wide.

Kluber

LONG TERM. 315 PM CST

Sunday through Friday .

The main story in the extended period is an overall warming trend to well above normal temperatures and an eventual end of our "dry spell" as the weather pattern turns more active midweek.

Sunday ushers in the return of southerly flow to the local area as the surface high shifts off to our east and upper level ridging builds across the Central Plains. This will help temperatures warm back into the 50s for most areas, with upper 40s for far northern Illinois and along the Illinois lakeshore. A quick moving shortwave rounding the upper ridge axis will help enhance southwesterly low-level flow oriented into the Great Lakes region Sunday night into Monday will set the stage for the first of a three day stretch of well above normal temperatures and gusty southerly winds with highs in the 60s looking like a good bet Monday through Wednesday.

Heading into midweek, the upper ridge continues to shift eastward as the upper trough deepens over the western CONUS. An associated elongated area of low pressure and associated cold front/surface boundary develops over the Midwest that gradually shifts toward the area late Tuesday into Wednesday. This combined with a plume of moisture surging north from the Gulf of Mexico will bring increasing potential for showers and perhaps even a few thunderstorms into Wednesday evening and overnight along the front. There is some uncertainty with the exact placement and timing of the surface features given we are still several days out. For now will maintain precip chances Wednesday through Friday. Depending on where the frontal boundary ultimately stalls out there will remain the potential for some training of moderate to heavy rain which could enhance precip totals locally and will need to be monitored as this period gets closer.

Petr

AVIATION. For the 00Z TAFs .

Aviation Forecast Concerns:

* Somewhat variable wind directions for KORD/KMDW later this evening after lake breeze circulation decays.

* North-northeast winds with afternoon lake enhancement again Saturday.

Late afternoon surface analysis depicts high pressure ridging extending through the upper Mississippi Valley and into northwest IL. The orientation of the ridge axis was producing generally northwest winds across the forecast area, though the lake breeze boundary off of Lake Michigan had pushed west into KMDW and KORD over the past couple of hours resulting in northeast winds there (and at KGYY). Expectation is that the lake breeze circulation will decay with/after sunset allowing these northeast winds to lighten up and veer more east-southeast, and probably become light and variable for a time overnight. West of the lake breeze boundary, winds should just become light and variable, though likely with some light northerly component at times.

Reinforcing surface high pressure is forecast to drift south across WI into northern IL Saturday, with northerly surface winds persisting. Model guidance continues to show more spread than usual with the details of hourly wind directions (likely due to complications with modeling existing snow pack west of the Chicago metro area), though there is support for some synoptic north-northeast direction to prevail. This should support a lake breeze enhanced northeast flow across the Chicago terminals by afternoon, again weakening and veering more easterly with time by early Saturday evening.

Forecast soundings continue to suggest some potential for some patchy stratus/stratocu to spread in early Saturday morning off of the lake, probably in the 1500-2000 foot MVFR range. Confidence is low with this however, especially in terms of coverage or becoming a ceiling, and have maintained a SCT015 mention at this time. Otherwise some patchy broken 8000-9000 foot VFR is expected especially across western parts of the forecast area this evening/overnight before the column dries out again Saturday.

Ratzer

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
CNII2 11 mi28 min N 2.9 G 7 34°F 25°F
OKSI2 12 mi133 min Calm G 1.9 37°F
FSTI2 13 mi133 min 35°F
CHII2 - Chicago, IL 14 mi43 min NNW 5.1 G 6 36°F 32°F
CMTI2 - 9087044 - Calumet, IL 17 mi55 min NW 1.9 G 4.1 1027 hPa
WHRI2 - Waukegan Harbor, IL 36 mi83 min Calm G 2.9 33°F
BHRI3 - Burns Harbor, IN 38 mi93 min ENE 4.1 G 5.1 34°F 1027.4 hPa
MCYI3 - Michigan City, IN 49 mi43 min NNE 9.9 G 9.9 35°F 26°F

Wind History for Calumet Harbor, IL
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N11
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S8
G11
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G12
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G18
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SW8
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G11
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G8
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W3
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NE7
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N3

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago Midway Airport, IL5 mi20 minNE 710.00 miMostly Cloudy37°F20°F50%1028.8 hPa
Chicago, Chicago-O'Hare International Airport, IL11 mi22 minNNE 410.00 miMostly Cloudy37°F22°F54%1028 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi21 minN 010.00 miA Few Clouds35°F25°F67%1028.5 hPa
Lewis University Airport, IL22 mi78 minNW 610.00 miOvercast37°F27°F67%1027.4 hPa
Chicago / West Chicago, Dupage Airport, IL24 mi21 minNE 410.00 miOvercast35°F25°F67%1028.2 hPa

Link to 5 minute data for KMDW

Wind History from MDW (wind in knots)
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Last 24hrN10N11NE9NE8NE7NE4NW4W4NW3NW3CalmCalmCalmN4NW7NW6NW8NW15N7NE8NE9NE10NE6NE7
1 day agoNE7NE4NE4NE4N4N5N11N12N9NE9NE15NE15NE15
G22
NE13NE10
G18
N17
G22
N14
G21
NE15NE16
G21
N12
G20
N11N9N12N10
2 days agoSW10
G20
SW10SW12SW11SW10SW10SW11SW8SW6SW8SW8W4NW8W3CalmW4NW7NW6NW8N9E7NE6NE8NE9

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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