Wednesday, April14, 2021
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Marine Weather and Tides
Highland Park, 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 6:09AMSunset 7:33PM Wednesday April 14, 2021 5:12 AM CDT (10:12 UTC) Moonrise 7:36AMMoonset 10:13PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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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LMZ740 Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 300 Am Cdt Wed Apr 14 2021
Today..West winds 10 to 20 kt becoming northwest 15 to 20 kt in the afternoon. A chance of sprinkles in the afternoon. Waves 1 to 3 ft.
Tonight..Northwest winds 10 to 20 kt. A chance of sprinkles this evening. Waves 1 to 3 ft building to 2 to 4 ft.
Thursday..Northwest winds 20 to 25 kt becoming northeast 10 to 20 kt in the afternoon. Partly Sunny. Waves 2 to 4 ft. A small craft advisory will likely be needed.
Thursday night..North winds around 10 kt. Partly cloudy. Waves 2 to 4 ft subsiding to 1 to 3 ft.
LMZ740 Expires:202104141530;;526978 FZUS53 KLOT 140800 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 300 AM CDT Wed Apr 14 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>742-141530-


7 Day Forecast for Marine Location Near Highland Park, IL
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location: 42.18, -87.81     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 140658 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 158 AM CDT Wed Apr 14 2021

SHORT TERM. 157 AM CDT

Through Thursday .

Incoming cooler air is the main near term weather story. Forecast high temperatures are 7 to 12 degrees below normal today, with largest departures north. Nothing out of line, but throw in clouds and spotty sprinkles, it's not an ideal spring afternoon ahead.

The persistent (and pesky) broad upper low centered across the Upper Midwest to Upper Great Lake continues to move very little early this morning. Mid-level height and temperature anomalies under/near the center of this are in the bottom 5th-10th percentile for this time of year, and looking at the MPX 850 mb temperature of -9C last evening, that was even the lowest 5th percentile. With low-level northwesterly flow, that cold air at that level will make inroads into the area, with -6C to -8C shown by guidance to arrive over northern Illinois this morning. This should keep northern areas shy of 50 today, with lower to mid 50s along/south of I-80.

Broken to overcast stratocumulus clouds upstream will accompany the cooler air, spilling southeastward over the CWA through today. The precipitation upstream -- in the form of light snow/flurries as close as La Crosse, WI as of 200 AM -- will slow its progress with a lack of deeper moisture and forcing translating southeast. Short term guidance varies some of the cloud layer depth north of I-80 in the CWA, but still have several models including the RAP showing over 2 kft, and the RAP even has low-level instability up to 25 J/kg in the far north this afternoon. Have maintained the chance of sprinkles and continued it into this evening with the system's gyrating positive vorticity pockets shifting southeast to our latitude after dark. This should maintain some nighttime stratocumulus, with low confidence in how quickly that erodes tonight. Despite northwest winds around 10 mph, quicker clearing would provide colder temperatures, including outlying locations dipping down to freezing. Most susceptible is north central Illinois. We continue to evaluate on a shift-by-shift basis on the need to start frost/freeze headlines considering the growing season starting to get underway in places. With the current expected forecast evolution, a hard freeze is not likely tonight.

During Thursday, the upper low will be entering the eastern Great Lakes. Cyclonic flow around this will still provide sub-zero 850 mb temperatures and also likely plenty of stratocumulus. Highs look to get into the 50s for most of the CWA, with a turn to onshore winds for lakeside locales expected during the afternoon.

MTF

LONG TERM. 157 AM CDT

Thursday night through Tuesday .

With a pronounced upper-level blocking remaining locked in place across the eastern Pacific Ocean, we'll remain in a relatively dry and seasonably cool pattern for the foreseeable future. Highs Friday though the weekend should be in the upper 50s with lows in the mid to upper 30s. Daily lake breezes will hold lakeshore locations in the mid to upper 40s. As a weak pacific system passes through Saturday/Sunday, do think there's a reasonable chance for a shower or two during the afternoon hours (moreso Saturday), though the more noticeable impact from the system will be increased cloud cover. Ensemble model guidance then indicates a cold front will swing through the Great Lakes around the Monday/Tuesday timeframe, with a locally better chance for anafrontal (e.g. behind the front) precipitation. Should the front come through during a nighttime period, thermal profiles will be cold enough for a rain snow mix, if not just pure snow. Behind the front, highs in the lower 50s and lows in the lower 30s are a distinct possibility considering ensemble median 850 mb temperatures falling below -5 C (note the NBM seems too warm).

Borchardt

AVIATION. For the 06Z TAFs .

There are no aviation concerns through the next 24 to 30 hours. Light west winds early this morning will gradually become northwesterly during daylight hours. Gusts in the 15-20 kt range are expected from late morning to about sunset. A broken cloud deck based near 4500 feet will develop toward late morning and erode toward the end of the TAF period.

Borchardt

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
WHRI2 - Waukegan Harbor, IL 13 mi132 min W 7 G 9.9
FSTI2 17 mi132 min 32°F
OKSI2 21 mi132 min W 1.9 G 2.9 43°F
CHII2 - Chicago, IL 22 mi52 min W 9.9 G 12 42°F 26°F
KNSW3 - Kenosha, WI 28 mi72 min WSW 6 G 9.9 38°F 1019.3 hPa (-0.3)
CMTI2 - 9087044 - Calumet, IL 34 mi72 min W 1.9 G 5.1 1019.8 hPa (+0.7)

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL7 mi80 minSW 510.00 miFair39°F23°F53%1020.6 hPa
Chicago, Chicago-O'Hare International Airport, IL15 mi81 minSW 410.00 miFair38°F24°F57%1020.3 hPa
Chicago/Waukegan Regional Airport, IL17 mi77 minWSW 310.00 miFair37°F23°F57%1019.7 hPa

Link to 5 minute data for KPWK

Wind History from PWK (wind in knots)
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Last 24hrSW4W6W8W13W12
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W8W4SW3S3SW3NW13
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1 day agoW5W7
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W8SW5SW5SW4SW4SW3SW3SW5SW4SW6
2 days agoCalmCalmNE4NE4E5NE5E5N5NE63NE8NE4E4E3E4CalmCalmCalmCalmCalmCalmNW5NW3NW5

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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