Marine Forecasts

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7 Day Forecast for Marine Location Near North Chicago, IL

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Area Discussion for - Chicago, IL

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Fxus63 klot 172350 afdlot area forecast discussion national weather service chicago romeoville, il 650 pm cdt Sat aug 17 2019 Short term 228 pm cdt through Sunday... several forecast challenges concerns this afternoon through Sunday morning, initially with respect to any additional scattered shower storm development this afternoon and then more widespread shower and storm potential overnight into early Sunday morning. In the near term, focus revolves around another incoming mid-level wave across eastern iowa this afternoon, which is expected to gradually shift eastward across northern il through the remainder of the daylight hours. Despite the atmosphere being considerably worked over this morning, a CU field is already evident across parts of eastern ia and northwest il out ahead of the wave in an increasingly unstable environment, along with some isolated to scattered radar returns (no lightning as of yet). Given the anticipated arrival of greater support aloft and some recovery across northeast il northwest in, will continue the mention of scattered showers and thunderstorms across the forecast area this afternoon... Most likely between 20z and 00z before support strips off to the east and a lull in activity is expected to become the rule this evening. There remains a non-zero chance through this afternoon for a stronger storm or two, mainly capable of producing gusty winds and perhaps some hail. However, focus rather quickly shifts to the tonight into early Sunday time frame as an active pattern is expected to remain in place. Additional, potentially widespread, showers and storms appear likely during this time frame as no real change to the overall pattern and environment is anticipated, with highly active mid- levels and strong warm air advection supported by a stout llj expected to be in place across the region. Latest trends continue to suggest a complex of thunderstorms developing across southern mn iowa late this evening into the early overnight hours before tracking eastward toward the CWA toward sunrise Sunday. While confidence isn't stellar, feel the most likely timing for storms to track through the region is somewhere between 09-14z, with most guidance in agreement with this timing. The exception is recent hrrr runs, which have significantly slowed shower storm chances to after 12z Sunday. There will remain a severe weather threat with these storms, primarily in the form of strong damaging winds, and to a lesser extent, large hail. Given lots of deep layer moisture (pwats progged AOA 1.75 inches), heavy downpours with at least an isolated flooding risk will also be a concern. Beyond Sunday morning, would expect some drier conditions to return for part of the day, although with lingering surface trough boundary across the region, wouldn't be surprised to see an additional isolated shower and or storm develop late in the day early evening. High temperatures Sunday expected to range from the low-upper 80s across the forecast area with afternoon heat indices near 90 degrees for many areas. Gillen Long term 226 pm cdt Sunday evening through Saturday... a surface trough will cross the area Sunday evening into Sunday night. This will lead to lingering chances for isolated to scattered showers and thunderstorms during the evening, with the threat decreasing from northwest to southeast into the overnight. Surface high pressure will move in from the west Monday and depart

Tuesday. The high will bring modestly drier air with it and somewhat cooler temps for Monday with highs in the lower 80s north to mid 80s south. Winds shift southerly Tuesday bringing warmer and more humid back into the area. An upper trough will cross the area with a weak surface reflection accompanying it. Will need to see what kind of thunderstorm chances will be present with this, but guidance seems to be more focused on something tracking more to the south of the area. Will keep chance pops going Tuesday night and Wednesday morning. A deeper upper low will move across ontario Wednesday pushing cooler and drier air into the local area as another surface high builds in, this time from the north. Guidance is at odds with some of the details with the GFS favoring slightly active upper flow which suggests subtle chances for shower thunder development late this week. Will continue with a dry forecast from Wednesday afternoon into the weekend but continue to keep an eye on how the pattern evolves. Mdb Aviation For the 00z tafs... 650 pm... Forecast concerns include... possible MVFR CIGS this evening. Isolated showers thunderstorms this evening. Thunderstorms Sunday morning. Strong gusty southwest winds Sunday afternoon. There is still a chance for an isolated thunderstorm this evening with a cell near dbq to the west and another near beh to the east. Not currently expecting anything more than isolated coverage so have left out mention from the tafs except for vicinity shower mention at rfd this evening. Focus then shifts to the predawn hours Sunday morning when a broken line of thunderstorms is expected to move across northwest il and then across the rest of the terminals through mid morning Sunday. These storms will likely have some gusty wind potential as well as possible ifr cigs vis. Confidence is low for additional convection Sunday afternoon into Sunday evening. It appears any new thunderstorms Sunday afternoon would be east or south of the terminals with perhaps a better chance for thunder later Sunday evening. There is still patchy MVFR CIGS across the area early this evening and these are expected to move northeast and scatter within the next few hours. Wind will remain south southwest under 10kts this evening... Likely shifting a bit more southwest ahead of the expected thunderstorms Sunday morning. Wind directions behind the storms will be dependent on how widespread the activity becomes but a south southeast direction for a short time is likely before winds shift to the southwest. Forecast soundings show quite a bit of wind in the low levels through mid afternoon. The sooner clouds clear and mixing begins the more likely gusts could be stronger than currently indicated. Wind speeds gusts will diminish with sunset Sunday evening. Cms Lot watches warnings advisories Il... None. In... None. Lm... None. Visit us at http: weather.Gov chicago (all lowercase) follow us on facebook... Twitter... And youtube at:

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
45186	1 mi	32 min	E 3.9 G 5.8	74°F	74°F	1 ft
45187	10 mi	72 min	S 1.9 G 3.9	78°F	73°F	1 ft
45174	16 mi	22 min	SSW 3.9 G 3.9		74°F	1 ft	1009.4 hPa
KNSW3 - Kenosha, WI	17 mi	32 min	SSE 8 G 8	75°F			1010.8 hPa (-1.1)
FSTI2	27 mi	92 min	SW 7	77°F
CHII2 - Chicago, IL	32 mi	42 min	SSW 8 G 8	77°F				71°F
OKSI2	32 mi	92 min	SE 1 G 1.9	79°F
45177	33 mi	152 min			75°F
CNII2	35 mi	32 min	SSW 5.1 G 9.9	77°F				66°F
JAKI2	41 mi	92 min	SW 4.1 G 8	78°F
CMTI2 - 9087044 - Calumet, IL	45 mi	44 min	SSW 5.1 G 7	77°F			1010.7 hPa	71°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI	46 mi	32 min	S 3.9 G 3.9	73°F	74°F		1011.7 hPa	69°F

Wind History for Calumet Harbor, IL

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S8 G11

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N8 G13

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NE7

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Chicago/Waukegan Regional Airport, IL	6 mi	86 min	Var 3	9.00 mi	Mostly Cloudy	75°F	70°F	84%	1010.3 hPa
Kenosha, Kenosha Regional Airport, WI	18 mi	99 min	SSW 4	10.00 mi	Fair	77°F	70°F	79%	1011.2 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL	18 mi	1.7 hrs	SSW 7	10.00 mi	A Few Clouds	78°F	68°F	71%	1011.1 hPa

Link to 5 minute data for KUGN

Wind History from UGN (wind in knots)

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Tide / Current Tables for

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Tide / Current Tables for

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Weather Map and Satellite Images

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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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Wind Forecast for Chicago, IL (20,4,5,8)

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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 numerious 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.