Sunday, March7, 2021
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Marine Weather and Tides
Winnetka, 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 6:13AMSunset 5:49PM Sunday March 7, 2021 9:16 PM CST (03:16 UTC) Moonrise 3:47AMMoonset 12:45PM Illumination 30% Phase: Waning Crescent; Moon at 24 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- 345 Pm Cst Sun Mar 7 2021
Tonight..Southeast winds 15 to 20 kt becoming south this evening then southwest 15 to 25 kt overnight. Partly cloudy. Waves 3 to 5 ft.
Monday..Southwest winds 15 to 25 kt becoming west 10 to 20 kt in the afternoon. Mostly Sunny. Waves 2 to 4 ft subsiding to 1 to 3 ft in the afternoon.
Monday night..Northeast winds 5 to 10 kt becoming southeast after midnight. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 ft or less.
Tuesday..South winds 10 to 20 kt increasing to 20 to 25 kt in the afternoon. Partly Sunny. Waves building to 2 to 4 ft.
LMZ740 Expires:202103080400;;626770 FZUS53 KLOT 072145 NSHLOT NEARSHORE MARINE FORECAST National Weather Service Chicago/Romeoville IL 345 PM CST Sun Mar 7 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>742-080400-


7 Day Forecast for Marine Location Near Winnetka, IL
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location: 42.11, -87.74     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 072334 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 534 PM CST Sun Mar 7 2021

SHORT TERM. 300 PM CST

Through Monday night .

A broad area of cirrus spread out across the area ahead of a quick moving shortwave rounding the upper ridge has acted to limit warming just a bit today, especially over our snow covered areas which are still in the mid 40s and locations along and south of the Kankakee River valley which will likely only top out in the mid 50s.

The low-level jet will increase in strength in the wake of the aforementioned disturbance overnight also increasing gustiness at the surface tonight into tomorrow morning out of the southwest with gusts to 25 to near 30 mph possible. This persistent southwesterly flow will act to advect warmer air into the local area with highs in the 60s likely for snow-free areas, upper 60s are even possible along and south of the Kankakee River Valley. Areas with a rather resilient snow pack that acts to limit how warm those areas can get, so did nudge down highs into the upper 50s for those locations. The stronger surface winds gradually shift south during the afternoon as surface high pressure dips closer to the area. This should act to weaken the surface gradient and wind gusts in the evening, which in turn will provide the lake breeze an opportunity to push inland in the early evening resulting in quickly dropping temperatures for areas near the lakeshore into the 30s and lower 40s.

Another disturbance ejecting off the Rockies approaches the area by Monday evening which will again result in an increase in high clouds over the area. This should help limit any fog concerns. If this cloud cover is delayed a bit more, thanks to increasing surface dew points and additional added moisture from expected melting of the remaining snowpack, there could be some patchy fog/haziness Monday evening before surface winds begin to ramp up and high clouds stream in overhead Monday night.

Petr

LONG TERM. 300 PM CST

Tuesday through Sunday .

We'll have gusty southerly winds in advance of the approaching warm front Tuesday afternoon, with gusts approaching 30 mph as our gradient tightens. Southerly flow will continue throughout Tuesday overnight into Wednesday, actually increasing to near 40 mph by Wednesday afternoon. This trajectory will advect in warm, moist air, with dewpoints approaching the lower 50s by Wednesday overnight, favoring our northwestern counties. Isentropic ascent associated with this warm front combines with a weak vort lobe to create rain showers early Wednesday morning. Although we'll be cloudy with rain, the strong southerly winds will allow our temperatures to climb once again into the 60s. Chances for precipitation may decrease somewhat Wednesday afternoon as we're between vort lobes, but will increase again Wednesday overnight with the approaching cold front. The best area for showers should be further west of our region where dynamics are a bit better for heavier rain and even a chance for thunderstorms, but not so great for our region due to a strong cap in place around 700 mb (around 8000 ft), with a decently dry atmosphere above this cap. This cap will erode throughout the day, but instability will also decrease, minimizing our chances for thunderstorms, with a short-lived moment of increased low-level instability (approaching 100 J/kg CAPE) Wednesday evening.

Precipitation is expected to continue throughout Wednesday night, with the cold front moving through Thursday morning, increasing our chances for heavier rain and creating a slight chance for possible thunderstorms, but presently the chance for thunder is low. Winds will turn northerly behind the front. There isn't a strong upper level support for this front, so it will not move south of us very quickly, allowing the rain to linger throughout Thursday into Thursday evening. The colder air is lagging behind, with 850 mb temperatures dropping from close to 10 C Wednesday overnight to close to 2 C Thursday night. Temperatures will cool down to lows in the mid to upper 30s and highs near 50 Friday afternoon.

Another surface low will approach from the southwest quickly after this cold front, bringing back more rain Friday overnight, the best chances of rain appearing to be south of I-80 at this time. Cold air will continue to filter into our region from the north, with some areas seeing lows Saturday morning slightly below freezing. These low temperatures will create a chance for rain/snow mix Saturday morning, switching primarily to rain Saturday afternoon as we warm up to the upper 40s. The chance for rain/snow mix will return Sunday morning as temperatures will again drop to below freezing at most locations Sunday morning, creating another chance for rain/snow mix Sunday morning. Once again we'll see any rain/snow mix to switch to liquid precipitation Sunday afternoon as we warm up again.

BKL

CLIMATE. 330 AM CST

A very mild air mass will be over the region Monday through Wednesday. If high temperatures overperform on Tuesday March 9th, readings could approach the current record highs for the date. Then record high minimum temperatures will likely be threatened or broken on Wednesday March 10th, most likely at Rockford.

Tuesday March 9th . Record High for Chicago: 69 in 1974 Record High for Rockford: 68 in 1977

Wednesday March 10th . Record High Min for Chicago: 52 in 1876 Record High Min for Rockford: 44 in 2010 Forecast Low: Lower 50s for both Chicago and Rockford

Castro

AVIATION. For the 00Z TAFs .

Aviation Forecast Concerns:

* Surface winds becoming breezy southwest overnight, with 40-45 kt low level jet producing LLWS conditions into Monday morning.

* Breezy west-southwest winds Monday, easing mid-late afternoon as a weak surface cold front moves through. Winds likely will veer to the northeast Monday evening behind the front.

Latest surface analysis depicts a warm frontal boundary extending southeast from MN through the Quad Cities and to near KBMI at 23Z. East of the warm front, winds were south to south-southeast around 10 kt. The warm front will lift northeast across the terminals late this evening, with winds veering southwest and increasing a bit, likely with some sporadic gusts in the 15-20 kt range. Just above the boundary layer, a west-southwesterly low level jet of 40-45 kt will develop and produce a period of LLWS conditions into Monday morning before weakening.

Surface winds will likely be gusty from the west-southwest Monday morning into early afternoon, but should eventually east mid to late afternoon as a weak cold frontal boundary sags south across the forecast area. Model guidance differs with the timing of the frontal passage across the terminals, though a general scenario of winds shifting west-northwest very late in the afternoon and then eventually veering to northeast through mid-evening appears reasonable. Timing of these wind shifts late Monday will need to be finessed in subsequent forecasts. The front will not have much push to it, and is expected to stall out south of the terminals Monday night.

Otherwise, VFR conditions are expected to prevail through the period with mainly patchy mid-high cloud at times. Some potential will exist for some lower (possibly MVFR) clouds to spread in off the lake for the Chicago area terminals Monday evening as winds turn northeast.

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
FSTI2 10 mi136 min 48°F
OKSI2 15 mi76 min NNE 2.9 G 7 50°F
CHII2 - Chicago, IL 16 mi26 min S 21 G 21 47°F 30°F
WHRI2 - Waukegan Harbor, IL 18 mi76 min S 8.9 G 11 36°F
CNII2 19 mi16 min S 8 G 8.9 46°F 27°F
CMTI2 - 9087044 - Calumet, IL 28 mi46 min S 6 G 8.9 1026.9 hPa
KNSW3 - Kenosha, WI 33 mi16 min S 8 G 11 37°F 1025.7 hPa (-0.7)
BHRI3 - Burns Harbor, IN 45 mi36 min SSE 6 G 8.9 45°F 1028.4 hPa

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago / Wheeling, Pal-Waukee Airport, IL8 mi24 minS 1110.00 miFair46°F29°F51%1027.1 hPa
Chicago, Chicago-O'Hare International Airport, IL12 mi25 minS 810.00 miPartly Cloudy45°F29°F54%1026.9 hPa
Chicago, Chicago Midway Airport, IL22 mi23 minS 810.00 miMostly Cloudy46°F26°F46%1028 hPa
Chicago/Waukegan Regional Airport, IL23 mi21 minSSE 410.00 miFair38°F29°F70%1026.8 hPa

Link to 5 minute data for KPWK

Wind History from PWK (wind in knots)
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Last 24hrCalmCalmCalmCalmE3CalmCalmCalmCalmCalmS5S8S9E6S7S10S10S12S11S10S8S7S6S11
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE34NE7NE3E5E7E7NE83E6CalmCalmCalm
2 days agoCalmW3N5NW3CalmCalmNW3NW3NW3CalmNW3NW6NW66NW9W12W9
G14
NW8NE8NE7NE6NE3CalmCalm

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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