Thursday, September24, 2020
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Marine Weather and Tides
Greendale, WI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:40AMSunset 6:46PM Thursday September 24, 2020 11:15 AM CDT (16:15 UTC) Moonrise 3:08PMMoonset 12:00AM Illumination 49% Phase: First Quarter Moon; Moon at 7 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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LMZ645 North Point Light To Wind Point Wi- 1105 Am Cdt Thu Sep 24 2020
Rest of today..South wind 10 to 15 knots backing southeast late in the afternoon. Partly Sunny. Waves around 1 foot.
Tonight..South wind 10 to 15 knots easing to 5 to 10 knots late in the evening, then veering southwest after midnight becoming southwest 5 to 10 knots early in the morning. Partly cloudy. Waves 1 to 2 feet.
Friday..Southwest wind 10 to 15 knots becoming south 15 to 20 knots in the afternoon. Sunny. Waves 1 to 2 feet building to 2 to 4 feet late in the afternoon.
Friday night..South wind 10 to 15 knots rising to 15 to 20 knots after midnight, then becoming southwest 10 to 15 knots with gusts to around 20 knots early in the morning. Partly cloudy. Waves 2 to 4 feet subsiding to 1 to 2 feet early in the morning.
LMZ645 Expires:202009242200;;299485 FZUS53 KMKX 241605 NSHMKX Nearshore Marine Forecast National Weather Service Milwaukee/Sullivan WI 1105 AM CDT Thu Sep 24 2020 For waters within five nautical miles of shore on Lake Michigan LMZ645-242200-


7 Day Forecast for Marine Location Near Greendale, WI
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location: 42.95, -87.95     debug


Area Discussion for - Milwaukee/Sullivan, WI
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FXUS63 KMKX 240750 AFDMKX

Area Forecast Discussion National Weather Service Milwaukee/Sullivan WI 250 AM CDT Thu Sep 24 2020

SHORT TERM. (Issued 250 AM CDT Thu Sep 24 2020)

Today through Friday:

Positive tilt mid level wave combined with weak waa/moist advection will bring chances of showers/isolated thunder to the area, mainly this afternoon into this evening. However, looking at the Bufkit soundings from the HRRR and NAM there is quite a bit of dry air through an appreciable depth. There is some elevated CAPE noted but an inversion around 7lk feet along with dry air is limiting much int he way of anything rooted from the surface. The meso progs continue the idea that portions of south central WI would have the best coverage of this activity with little in the southeast corner. This tied to potentially a little better low level convergence with weak trough/boundary extending east from northern Iowa. As the mid level wave shifts way this evening that should bring an end to any lingering shra/isold T. Southerly winds will ramp up on Friday with a reinforcing shot of unseasonable warmth into the area. Will likely see an onshore component evolve, but all in all plenty of sunshine with highs well into the 70s.

Collar

LONG TERM. (Issued 250 AM CDT Thu Sep 24 2020)

Friday night through Wednesday:

This weekend will see a few shortwaves move across northern MN/WI before a stronger trough digs and amplifies Sunday night into Monday. The main synoptic forcing with each of these waves will be displaced to the north of the area but weak fronts associated with each system could provide enough focus for showers and storms. The first will move through Friday night into Saturday morning and could clip the northeastern half of the area with a few storms. Then as WAA strengthens Saturday we could see a few showers develop along the elevated warm front but these would dissipate quickly and push east leaving mostly sunny skies for the afternoon hours. Expect highs into the upper 70s to lower 80s for Saturday and with dewpoints in the 60s to near 70 it will be the gasp of summer like weather. A stronger front will move through Saturday evening into Sunday morning and could bring a round of showers and storms to the area but again main forcing is north of the area. So, overall don't have the highest confidence in pops at this time and have kept them at slight chance to chance for the weekend. By the time the synoptic forcing starts to align over the area Sunday into Monday any frontal features will be well to the S/SE and with drier air filtering in any activity won't be very organized and just be mainly light on/off showers.

Temperatures stay near normal for Sunday with highs around 70. Things then begin to take a nose dive as a large amplified trough takes hold for much of the eastern US. Highs by Tue/Wed range from the low to mid 50s, which may be a bit of a shock to the system after longer stretch of quiet and warm weather. Various vorticity maximums moving through this larger scale trough will bring on/off showers through the week.

Stumpf

AVIATION. (Issued 250 AM CDT Thu Sep 24 2020)

Patchy IFR vsbys early this morning with low lying/river valley fog. This will burn off. Spotty showers/isold tsra potential especially this afternoon and evening. Models have been consistent tin focusing best coverage of any shra activity more in SC WI this afternoon and evening. Overall, coverage not looking impressive at the moment. Otherwise quiet overnight with southerly winds on the uptick Friday as low pressure heads towards extreme northwest WI.

Collar

MARINE. (Issued 250 AM CDT Thu Sep 24 2020)

Weak low pressure trough extends into Wi today from Iowa. This combined with mid level energy may kick off a few shra/isold tsra across mainly the central and northern portions of the lake today. Greatest coverage likely this morning in the north where activity shifting east through far northern WI. Otherwise low pressure approaches northwest WI on Friday. This will tighten up the pressure gradient and lead to an uptick in the southerly wind regime. At this time it appears potential for any lake headlines, be it a small craft or gale, look low. However best shot at the moment would be a small craft for the nearshore waters but for now expected wind and wave action appears to come up a bit short.

Collar

MKX WATCHES/WARNINGS/ADVISORIES. WI . None. LM . None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MLWW3 - Milwaukee, WI 5 mi26 min SW 6 G 7 73°F
45013 12 mi46 min S 7.8 G 9.7 69°F 62°F1014.3 hPa
KNSW3 - Kenosha, WI 26 mi76 min W 5.1 G 7 67°F 1014.2 hPa (+0.3)
PWAW3 - Port Washington, WI 31 mi36 min WSW 4.1 G 8 73°F 1014.6 hPa
45187 33 mi36 min SSW 3.9 G 5.8 70°F 64°F1 ft
WHRI2 - Waukegan Harbor, IL 41 mi76 min W 6 G 11

Wind History for Calumet Harbor, IL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Milwaukee, General Mitchell International Airport, WI3 mi24 minWSW 810.00 miA Few Clouds74°F59°F60%1013.5 hPa
Milwaukee-Timmerman, WI13 mi31 minSW 510.00 miFair70°F55°F60%1014.2 hPa
Waukesha County Airport, WI14 mi31 minSSW 810.00 miClear70°F59°F69%1014.6 hPa
Racine, Batten International Airport, WI15 mi23 minSW 710.00 miFair74°F61°F64%1014.3 hPa

Link to 5 minute data for KMKE

Wind History from MKE (wind in knots)
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Last 24hr3W7SW8
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SW7SW8SW5SW5SW4CalmCalmSW7SW6SW7SW4SW3S3S3CalmSW4W3SW8W8
1 day agoSW6SW7SW6SW8SW9SW7S6SW6SW6S4CalmCalmW6W5W6W4W4W3W4W5SW4SW6W5W6
2 days agoSW9S10SW9SE11SE13SE11S8S7S6S7S5S4CalmS6SW4SW4S3SW4SW6SW5SW5SW9W8SW5

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    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
Ground Weather Radar Station Milwaukee, WI
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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.