Monday, March30, 2020
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Marine Weather and Tides
Sleepy Hollow, 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 7:18PM Monday March 30, 2020 7:15 AM CDT (12:15 UTC) Moonrise 10:08AMMoonset 12:33AM Illumination 39% 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- 304 Am Cdt Mon Mar 30 2020
.small craft advisory in effect until 10 am cdt this morning...
Today..Northwest winds 20 to 25 kt becoming north 10 to 15 kt early in the afternoon, then becoming northeast late in the afternoon. Mostly cloudy. Waves 3 to 5 ft subsiding to 2 to 4 ft in the afternoon.
Tonight..Northeast winds 10 to 15 kt becoming north 15 to 20 kt late in the evening. Mostly cloudy. Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft after midnight.
Tuesday..North winds 15 to 20 kt. Cloudy. Waves 4 to 6 ft occasionally to 8 ft.
Tuesday night..North winds 10 to 20 kt diminishing to 5 to 10 kt after midnight. Mostly cloudy. Waves subsiding to 2 to 4 ft.
LMZ740 Expires:202003301500;;293081 FZUS53 KLOT 300804 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 304 AM CDT Mon Mar 30 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>742-301500-


7 Day Forecast for Marine Location Near Sleepy Hollow, IL
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location: 42.1, -88.29     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 301138 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 638 AM CDT Mon Mar 30 2020

SHORT TERM. 324 AM CDT

Through tonight .

Vertically stacked low pressure system was centered just east of Georgian Bay Ontario early this morning. Additional smaller scale vorticity maxima were evident rotating cyclonically around the western periphery of the upper low, helping to maintain cyclonic low level flow across the western Great Lakes. Surface/Satellite and radar observations indicate blustery northwest winds, extensive low level cloud cover and a few sprinkles persist across the region within this regime.

Near term guidance depicts the wrapped-up system will drift east- southeast across southern Ontario today and across New England this evening, while gradually filling. Short wave ridging develops aloft in its wake, with rising heights indicative of modest but deep subsidence across the western Lakes later today and tonight. In the lower levels, this results in a relaxing of the cyclonic surface pressure gradient this morning, and eventual development of surface high pressure ridging into the area tonight, after the passage of a weakening cold front. Low level winds still gusting 25-30 mph early this morning will gradually diminish and turn north-northeast, though this will not favor eroding cloud cover across eastern parts of the forecast area where low level moisture will remain trapped beneath the developing subsidence inversion. The combination of low level cool advection, mostly cloudy skies and onshore flow in the vicinity of Lake Michigan will keep temperatures in the 40s across the eastern parts of the cwa. Western and southwestern parts of the forecast area should see more sun/breaks in clouds supporting temperatures closer to our low-mid 50s averages for late March highs.

Surface ridge redevelops across the western Lakes late tonight in the wake of the cold front, while an area of weak low pressure moves into the lower Mississippi Valley. Northeast winds increase a bit across the area in response to this, maintaining cool conditions in the 30s across the forecast area overnight. Guidance also maintains or redevelops low clouds across eastern parts of the cwa with the moist low level northeast trajectory. Areas farther south and west, which may start out the night partly cloud, will see at least an increase in high clouds associated with the wave passing south of the region as well as an eventual expansion of low clouds from the northeast.

Ratzer

LONG TERM. 324 AM CDT

Tuesday through Sunday .

Dry but cool weather is expected to linger during the mid-week period, as surface high pressure ridge remains in place while troughs amplify on the east and west coasts and slow the progression of the pattern. Low level cloud cover may persist Tuesday behind tonight's cold front, which combined with continued somewhat breezy flow off of the lake will make for a fairly cool day. Wednesday should see some moderation as upper ridging builds and with more sunshine expected, though still lighter flow off of the lake making for cooler temps there.

Surface pressure falls develop across the Plains to our west on Thursday, as short wave energy wrapping around the base of a western North American upper trough comes across the central/northern Rockies. Low level wind flow turns south- southeasterly in response, with warm advection becoming established into the western Lakes. Thus while southeast surface winds will still keep the Illinois lake shore areas cooler, it appears 60 degree warmth will return to a large portion of the forecast area. The main corridor of low level moisture return remains west of the Mississippi, likely keeping precipitation away through the day, though an increase in high clouds is expected. Gradual eastward shift of the better moisture transport Thursday night does increase the potential for rain across mainly far western parts of the forecast area during the night.

The end of the week appears unsettled, as a slow-moving cold front approaches and eventually moves through the area sometime Friday night or Saturday. As is usually the case, some differences remain in timing of the this front between the medium range guidance, though it appears rain potential would be diminishing or ending altogether by Sunday.

Ratzer

AVIATION. For the 12Z TAFs .

638 AM . Forecast concerns include .

Gusty northwest winds this morning. Lake breeze/wind shift to northeast this afternoon. Mvfr cigs possible today and likely tonight.

Northwest winds will remain gusty through early afternoon as directions turn more north/northwest this afternoon. As a ridge of high pressure builds across the area this afternoon . a lake breeze is expected to move inland during the mid/late afternoon shifting winds northeasterly. A weak cold front will move south across the area late this evening shifting winds back northerly with speeds increasing to 10-12kt with some possible gusts.

The back edge of stratocu is near ord/mdw and may scatter for a few hours but additional stratocu is expected to develop this morning with bkn high mvfr/low vfr cigs expected into this evening. These cigs are likely to lower through mvfr tonight with ifr cigs possible Tuesday morning but confidence is low for ifr cigs. cms

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . Small Craft Advisory . nearshore waters until 10 AM Monday.



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OKSI2 38 mi135 min NNW 4.1 G 8.9 45°F
CHII2 - Chicago, IL 40 mi25 min WNW 17 G 21 42°F 35°F
CNII2 40 mi30 min WNW 11 G 17 42°F 31°F
KNSW3 - Kenosha, WI 42 mi75 min WNW 15 G 18 41°F 1016.3 hPa (+2.8)
CMTI2 - 9087044 - Calumet, IL 47 mi45 min W 8 G 14 42°F 1017 hPa33°F

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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SW16
G22
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G34
SW18
G31
SW21
G34
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G32
SW17
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SW19
G28
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G26
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G18
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G22
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W6
G15
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NW10
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N4
G8
N2
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E1
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N1
NE3
N4
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N4
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N6
E5
SE10
G14
SE12
G18
S13
G20
SW16
G23
S10
G14
S8
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G12
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G14
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G23
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N7
G11
NE6
G9
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G10
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G12
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G11
N7
G10
N5
G8
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G12
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G15
NE5
G9
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NE7
G10
E13
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NE3
NW11
G17
E8
G11
E10
G13
S5
G10
NW2

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / West Chicago, Dupage Airport, IL12 mi23 minWNW 1210.00 miFair38°F30°F76%1018.6 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL21 mi23 minWNW 710.00 miMostly Cloudy40°F32°F73%1018.5 hPa
Chicago, Chicago-O'Hare International Airport, IL22 mi24 minW 8 G 1710.00 miA Few Clouds40°F30°F70%1018.1 hPa

Link to 5 minute data for KDPA

Wind History from DPA (wind in knots)
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Last 24hrSW24
G34
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W22
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W22
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W16
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W16
G25
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G27
W19
G27
W15
G21
W12NW13
G24
NW16
G21
W10NW12
1 day agoNE11NE10NE9E6SE5CalmSE11SE11E7E8NE11E10E9SE8SE9S12SW19
G28
SW11SW12S8SW11
G21
SW15
G23
SW22
G32
SW18
G32
2 days agoNE9NE10NE9E8E11NE11NE13E11NE11NE10NE9NE12
G18
E8E9E7E11E6E9S8
G23
E4E7E3N10NE9

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS Local Image of    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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Chicago, IL (8,2,3,4)
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Ground Weather Radar Station Chicago, IL
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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.