Monday, March30, 2020
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L-36.com


Marine Weather and Tides
Gurnee, IL

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:36AMSunset 7:15PM Sunday March 29, 2020 11:38 PM CDT (04:38 UTC) Moonrise 9:29AMMoonset 12:00AM Illumination 35% Phase: Waxing Crescent; Moon at 6 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- 954 Pm Cdt Sun Mar 29 2020
.small craft advisory in effect through Monday morning...
Rest of tonight..Northwest winds to 30 kt. Mostly cloudy. Waves 3 to 5 ft.
Monday..Northwest winds 20 to 25 kt becoming northeast 10 to 15 kt in the afternoon. Partly Sunny. Waves 2 to 4 ft subsiding to 1 to 3 ft in the afternoon.
Monday night..North winds 10 to 20 kt. Mostly cloudy. Waves 2 to 4 ft building to 3 to 5 ft after midnight.
Tuesday..North winds 15 to 20 kt. Mostly cloudy. Waves 3 to 5 ft.
LMZ740 Expires:202003301015;;283321 FZUS53 KLOT 300254 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 954 PM CDT Sun Mar 29 2020 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>742-301015-


7 Day Forecast for Marine Location Near Gurnee, IL
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location: 42.38, -87.94     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 300249 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 949 PM CDT Sun Mar 29 2020

UPDATE. 947 PM CDT

There will be some light showers on the back side of the departing upper low due to continued cyclonic flow. Otherwise were are still somewhat mixed in the low levels and have 3 mb/3 hr pressure rises, thus breezy conditions with gusts to 35 mph this evening will slowly taper this evening and overnight.

KMD

SHORT TERM. 242 PM CDT

Through Monday night .

Strong winds continue this afternoon as a slowly weakening 996 hPa low over south-central Upper Michigan drifts northeastward. 3hr pressure rises up to 5 hPa within the strong pressure gradient combined with modest diurnal mixing beneath a stratus deck is resulting is in W/WSW wind gusts of 45 to 50 mph across much of the area. The pressure gradient will slowly weaken through the night, though continued 3hr pressure rises of 2-3 hPa and slower decoupling due to continued cloud cover should slow the expected downward trend in wind speeds. NW winds gusting 20 to 25 mph will continue into early Monday afternoon. As an approaching ridge builds into the area from the west, winds will shift NE/E off Lake Michigan late in the afternoon into Monday night.

In terms of precip, isolated light showers or sprinkles remain possible into early evening within deep cyclonic flow, but conditions should otherwise remain dry through Monday night.

Kluber

LONG TERM. 242 PM CDT

Tuesday through Sunday .

A fairly quiet period of weather is in store into next weekend as the mid-level pattern slows from a hybrid of weak Omega and Rex blocking across the CONUS, with the mid-level saddle point over the upper Great Lakes Tuesday and Wednesday. This supports continued dry conditions into Thursday and possibly even well into Friday. As the western trough of the Omega block progresses eastward later in the week, a cold front associated with the trough will lift northeast into far west Ontario, dragging a cold front with rain chances across the area late Friday into Saturday. After a seasonably cold day in the mid 40s Tuesday, temperatures will moderate to seasonable values as we flip the calendar to April.

Kluber

AVIATION. For the 00Z TAFs .

Concerns:

- Strong west winds turning breezy northwest overnight - MVFR conditions - Timing the shift to NE winds at ORD/MDW Monday afternoon

Strong pressure rises behind low pressure across Lake Superior will slowly diminish this evening as the low weakens and moves farther east. Gusts in the mid to upper 30 kt range will taper through the evening as winds turn northwest. Expect northwest winds to start Monday though gusts should be around 20 kt. The pressure gradient slackens enough to allow an onshore wind shift at ORD/MDW in the afternoon. Confidence on timing is medium with most guidance in the 20z-23z time frame.

Expect MVFR conditions at times at clouds continue to wrap around the departing low.

KMD

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . Gale Warning . nearshore waters until 10 PM Sunday.



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KNSW3 - Kenosha, WI 16 mi38 min WNW 16 G 21 42°F 1010.8 hPa (+2.0)
OKSI2 36 mi98 min NNW 2.9 G 8 47°F
CHII2 - Chicago, IL 38 mi38 min W 20 G 23 45°F 38°F
CNII2 40 mi23 min SW 13 G 19 45°F 34°F

Wind History for Calumet Harbor, IL
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SW16
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E13
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NE3
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G17
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S5
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NW2
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G13
N4
G8
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E1
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N1
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G14
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G18
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NW8
G11
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G11
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G15
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G12
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G12
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G15
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G10

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL5 mi43 minW 8 G 1810.00 miOvercast42°F35°F76%1011.3 hPa
Kenosha, Kenosha Regional Airport, WI15 mi45 minWNW 14 G 2210.00 miOvercast43°F34°F71%1011 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL19 mi46 minW 17 G 2110.00 miOvercast45°F36°F71%1012.4 hPa

Link to 5 minute data for KUGN

Wind History from UGN (wind in knots)
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SW9SW11SW15SW15SW20
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G36
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W11
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1 day agoE9E11E7E7SE7NE7N7NE14
G23
NE7NE8E8E8E4SE3NE6N6NE7E12NE8E11
G20
SE14
G21
SE16
G31
SE12SE10
2 days agoN6N9N7N9N5N5N5N8NE5E8E8NE8NE8NE7NE7NE7NE8NE6NE8NE10N9
G17
NE9E9E12
G21

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
GEOS Local Image of Midwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Chicago, IL (0,6,7,8)
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Ground Weather Radar Station Chicago, IL
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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 numerous 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.