Saturday, March23, 2019 L-36.com


Marine Weather and Tides
Winthrop Harbor, IL

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:47AMSunset 7:07PM Saturday March 23, 2019 9:19 AM CDT (14:19 UTC) Moonrise 10:26PMMoonset 8:38AM Illumination 93% Phase: Waning Gibbous; Moon at 17 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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LMZ646 Wind Point Wi To Winthrop Harbor Il- 905 Am Cdt Sat Mar 23 2019
.gale watch in effect from Sunday afternoon through Monday morning...
Rest of today..Southwest wind 5 to 10 knots becoming south 10 to 15 knots early in the afternoon, then backing southeast late in the afternoon. Sunny. Waves 1 to 2 feet.
Tonight..South wind 10 to 15 knots easing to 5 to 10 knots after midnight, then veering southwest early in the morning. Slight chance of rain after midnight. Waves 1 to 2 feet.
Sunday..South wind 5 to 10 knots backing southeast early in the afternoon, then becoming northeast 10 to 20 knots late in the afternoon. Chance of rain. Waves 1 to 2 feet.
Sunday night..Northeast wind up to 30 knots easing to 15 to 25 knots early in the morning. Gusts up to 35 knots. Chance of rain and slight chance of snow through around midnight. Waves 4 to 6 feet building to 8 to 10 feet in the late evening and overnight. Wave heights are for ice free areas.
LMZ646 Expires:201903232200;;798210 FZUS53 KMKX 231406 NSHMKX Nearshore Marine Forecast National Weather Service Milwaukee/Sullivan WI 905 AM CDT Sat Mar 23 2019 For waters within five nautical miles of shore on Lake Michigan LMZ646-232200-


7 Day Forecast for Marine Location Near Winthrop Harbor, IL
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location: 42.47, -87.82     debug


Area Discussion for - Chicago, IL
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Fxus63 klot 231018
afdlot
area forecast discussion
national weather service chicago romeoville, il
518 am cdt Sat mar 23 2019

Short term
304 am cdt
through Sunday...

this early spring day will start off on the chilly side as high
pressure lingers overhead, making for optimal radiational cooling
now that our wind field has eased. It is a cold 22 in waukegan as
of 255 am. Not seeing much fog out there, but given some outlying
areas with low dewpoint depressions and little to no wind,
suspect we will have some patchy fog, especially in river
valleys.

Meanwhile, fairly amplified flow is in place aloft with a closed
across the colorado rockies, a ridge across the plains into
central canad, then downstream trough across the northeastern
united states. The upper ridge across the plains will spread
aloft shoving the surface high to the eastern great lakes. This
will open door to more southerly low level flow and warming up to
near normal temperatures today. The ridge should hold off
significant cloud cover. The south southwest flow should
generally limit the inland progress of an afternoon lake breeze,
so the lake cooling will be much less extensive. The Saturday
afternoon lake breeze will some inland progress across northern
cook county and lake county (il), but will likely struggle in
northwest indiana with opposing synoptic flow. Anticipate highs in
the low to mid 50s away from the lake with 40s near the lake.

Our next precipitation maker will arrive later Saturday night into
Sunday as the low across colorado will approach. Initially the
leading ridge and downstream flow across eastern canada will slow
and weaken the low. We get a decent shot of warm moist advection
ahead of the low late tonight into Sunday, combined with pwats
approaching 0.75" should lead to a period of rain during this
period. QPF numbers are not too high given the limited period of
organized forcing, given that the forcing weakens a bit during
the day following this initial surge. It appears there is enough
continued warm advection induced lift ahead of low, renewed height
falls, and a southward moving cold front for continued damp
conditions at least at times on Sunday. Thunder chances appear
greater across central il where they are still quite low.

Kmd

Long term
330 am cdt
Sunday night through Friday...

initial concern is for a short window of potential wintry precip
for parts of the area Sunday evening into the overnight. As the
weak surface low passes to our south, cold front will move across
the area by early evening, flipping winds to northeast. Strong
high pressure spreading toward the region from central canada will
tighten the northeast pressure gradient between it and the low to
the south, resulting in quickly strengthening northeast winds and
a much colder and drier air mass rushing in.

The big question is exactly how fast temperatures drop and how
much forcing is left for precip when temperatures dip to near or
below freezing. 00z NAM was by far the most aggressive on both
counts, yielding a period of freezing rain into parts of northern
il due to warm layer aloft slower to cool than surface temps
cooling to or below 32f. With other guidance slower to cool
surface temps and less aggressive with precip hanging back,
played it more conservative in the grids and just carried slight
freezing rain chances toward and after midnight. With some minor
elevated instability in central il to west central in during early
evening prior to cold advection aloft commencing, maintained
slight chance for thunder there, though confidence is low in this.

Northeast winds will gust to 30 mph inland and potentially as
high as 35-40 mph lakeside on Sunday night, and will need to watch
for minor lakeshore flooding potential given high lake levels.

Monday will clear out with the surface high moving toward the
area, though northeast winds will be slow to ease. It will be
unseasonably chilly, especially near the lake in the mid to upper
30s, with lower 40s inland and perhaps mid 40s in spots well
inland. The western ridging and eastern troughing responsible for
the fairly chilly conditions of late will finally break down early
in the work week, supporting a rare stretch of above normal temps
mid to late week. This will be accompanied by rain shower
potential from Wednesday night onward as multiple short-waves
emanate from trough in west that will then eject and bring a
return to cooler conditions next weekend. There's plenty of
uncertainty in exactly how the pattern will evolve in the
Thursday-Friday stretch with large variance in operational models
and ensembles. Rain chances currently appear to be highest next
Friday.

Castro

Aviation
For the 12z tafs...

concern today will be if the lake breeze will make it to ord mdw,
then on timing our next batch of rain late tonight and Sunday.

High will shift to the eastern great lakes today. Therefore light
winds and mostly clear skies will begin this operational period.

Winds will likely veer a bit west of south today, and then drift
closer to south through the day. We still feel the lake breeze
will just impact gyy and the lakeshore areas, however this will
bear watching as any minor change in the strength of the low level
winds could result in a flip over to an east wind direction at
ord and mdw. Mdw (and maybe ord) also stand the chance to shift to
more of a southeast wind late this afternoon early evening, but
speeds should remain on the lighter side.

Precipitation in the form of rain will hold off until overnight.

Expect that it will continue into Sunday morning, with some breaks
possible at times Sunday. But expect lowVFR or even MVFR cigs
once the rain begins.

Kmd

Marine 354 am cdt
hoisted a gale watch for the entire illinois and indiana nearshore
for Sunday night into early Monday. A strong cold front passage
with unseasonably strong high pressure spreading toward the
region will result in northeast winds rapidly increasing Sunday
evening. Much colder air moving in will also aid in creating more
unstable conditions and deeper mixing with time. Guidance is not
in lock step agreement on this potential gale event, with the nam
model more supportive than the remaining guidance, so confidence
is only medium. However, opted to issue the watch for northeast
gale to 35 kt potential in collaboration with WFO milwaukee. If
the gales occur, they should ease by sunrise Monday, followed by
conditions hazardous for small craft that should subside sometime
on Monday night.

Castro

Lot watches warnings advisories
Il... None.

In... None.

Lm... Gale watch... Lmz740-lmz741-lmz742-lmz743-lmz744-lmz745... 9 pm
Sunday to 7 am Monday.

Visit us at http: weather.Gov chicago (all lowercase)
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KNSW3 - Kenosha, WI 8 mi20 min SSE 2.9 G 2.9 34°F 1027.1 hPa (+1.4)
WHRI2 - Waukegan Harbor, IL 8 mi40 min ESE 1.9 G 1.9 38°F
FSTI2 35 mi80 min ENE 4.1 34°F
CHII2 - Chicago, IL 40 mi30 min NE 2.9 G 2.9 35°F 31°F
MLWW3 - Milwaukee, WI 40 mi30 min 33°F
JAKI2 49 mi80 min ENE 1 G 1.9 37°F

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago/Waukegan Regional Airport, IL4 mi25 minN 010.00 miFair34°F27°F76%1027.9 hPa
Kenosha, Kenosha Regional Airport, WI10 mi27 minN 010.00 miFair33°F30°F89%1027.6 hPa
Racine, Batten International Airport, WI20 mi27 minS 310.00 miFair34°F28°F79%1028 hPa

Wind History from UGN (wind in knots)
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NE11NE9NE5NE4CalmCalmCalmCalmCalmCalmW4W3W4CalmCalmCalmCalm
1 day agoN7N5N75NW7NW9NW9W8
G16
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SW4SW5W6----------------N6NW5NW5N5
2 days agoSW11
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SW10SW9SW9SW10SW8SW8SW7SW5S5S5SW9W4NW5NW6NW7NW5NW7NW6N7N9
G17
N8N7N5

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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GOES 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 (10,2,3,4)
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Ground Weather Radar Station Milwaukee, WI
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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.