Marine Weather and Tides
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 5:47AM||Sunset 8:07PM||Wednesday August 5, 2020 8:17 PM CDT (01:17 UTC)||Moonrise 9:38PM||Moonset 7:36AM||Illumination 96%|
7 Day Forecast for Marine Location Near Gurnee, ILHourly EDIT Help
Area Discussion for - Chicago, IL  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KLOT 052345 AFDLOT
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 645 PM CDT Wed Aug 5 2020
SHORT TERM. 253 PM CDT
Through Thursday night .
Continued quiet but not as cool conditions are expected over the next 36 hours. Despite steep low level lapse rates and a weak shortwave aloft supporting a robust cumulus field and a band of cirrus this afternoon, subsidence and dry air at mid levels are keeping a lid on any shower activity that might otherwise want to develop. Even so, some virga or a random sprinkle would not be a surprise into the early evening.
Overnight lows tonight and Thursday night will not be nearly as chilly as this morning but still a bit below seasonal norms. Highs Thursday look just a couple degrees warmer than today and in general tomorrow should be a near repeat of today, likely with greater cloud cover earlier in the day.
LONG TERM. 325 PM CDT
Friday through Wednesday .
The pleasant, low humidity stretch of weather will come to an end on Friday, with warmer and more humid conditions over the weekend. Friday itself will have seasonably warm low to locally mid 80s (upper 70s shore), pleasantly low humidity as dew points mix out into the 50s-low 60s F and plenty of sun. Saturday will then see 850 mb temps surge into the upper teens Celsius, with 925 mb temps in the lower 20s C by later in the day. After a nice Friday night and a seasonable start to Saturday, high temps will jump to the mid to upper 80s with aforementioned increased humidity. The hot and humid day of the weekend will be Sunday, when high temperatures into the lower 90s and dew points into the 70s, except perhaps over the heart of the Chicago heat island, will yield peak heat indices near to around 100F, and locally slightly over 100F.
Convective chances over the weekend appear rather nebulous. An initial short-wave crossing the mid and upper MS Valley late Friday night into Saturday could outrun the instability axis, which will be primarily just to our west as of 12z Saturday. If any showers and storms make it into the CWA, question would be if there's any redevelopment in the afternoon and evening, as some guidance indicates fairly stout capping moving in. It appears that while set-up favors primarily isolated showers and thunderstorms, there would be a relatively greater threat into northwest, north central, and far northern Illinois. If any stronger updrafts can form PM hours, 25-30 kt of bulk shear may result in a few isolated stronger storms. Overall, would appear many areas should stay dry on Saturday. Height rises into Sunday would then likely keep convective coverage low/isolated at most through the daylight hours, with moderate to strongly unstable but likely capped air mass from a fairly stout EML.
While confidence is not all that high, next more apparent convective threat would be Sunday night into Monday ahead of a cold front. Would have to watch for an MCS approaching from the west during that time. Then depending on effects from any earlier convection, another round of showers and storms would be possible with the true cold front Monday afternoon-evening, possibly with some strong-severe (depending on deep layer shear magnitudes) and localized flood risk. Monday's low-level thermal progs would favor similarly warm temps to Sunday, but potential for more cloud cover and scattered convection may limit things slightly. Behind the front, the 12z suite indicated a drier trend on Tuesday and Tuesday evening, so nudged PoPs lower from NBM initialization. Predictability really decreases by mid next work week and beyond, as the 12z ECMWF suite indicates a benign dry and warm pattern may stick around for at least a few days, while the GFS has a much more active look.
AVIATION. For the 00Z TAFs .
Light and variable winds will be in place through tonight with light winds for Thursday as well. Am expecting more of an easterly direction to set up toward midday Thursday but speeds will only increase into the 5-7 kt range for the most part. VFR will continue with scattered to occasionally broken cumulus developing toward midday.
LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . None.
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Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|WHRI2 - Waukegan Harbor, IL||7 mi||78 min||SSE 11 G 12||72°F|
|45187||11 mi||38 min||S 9.7 G 12||71°F||71°F||2 ft|
|KNSW3 - Kenosha, WI||16 mi||78 min||S 12 G 14||71°F||1017.9 hPa (-0.4)|
|45174||23 mi||18 min||SSE 9.7 G 12||72°F||72°F||2 ft||1018 hPa (-0.7)||59°F|
|OKSI2||36 mi||138 min||ESE 2.9 G 6||73°F|
|CHII2 - Chicago, IL||38 mi||28 min||SE 13 G 15||72°F||59°F|
|CNII2||40 mi||33 min||ESE 7 G 8.9||70°F||56°F|
|MLWW3 - Milwaukee, WI||43 mi||38 min||SE 8.9 G 11||70°F|
Wind History for Calumet Harbor, IL(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Chicago/Waukegan Regional Airport, IL||5 mi||23 min||ESE 3||10.00 mi||Overcast||70°F||59°F||68%||1017.5 hPa|
|Kenosha, Kenosha Regional Airport, WI||15 mi||25 min||SE 3||10.00 mi||Partly Cloudy||70°F||57°F||66%||1018.4 hPa|
|Chicago / Wheeling, Pal-Waukee Airport, IL||19 mi||26 min||WNW 5||10.00 mi||Overcast||75°F||53°F||46%||1018.4 hPa|
Link to 5 minute data for KUGN
Wind History from UGN (wind in knots)
|1 day ago||N||N||NE||N|
|2 days ago||Calm||N||NW||Calm||NW||N||NW||N||N||N||N||N||N||NW||N||N|
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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.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Chicago, IL (21,6,7,8)(on/off)  Help
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