Thursday, January18, 2018 L-36.com


Marine Weather and Tides
Jacksonville, IL

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:17AMSunset 5:05PM Wednesday January 17, 2018 11:24 PM CST (05:24 UTC) Moonrise 7:37AMMoonset 5:49PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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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7 Day Forecast for Marine Location Near Jacksonville, IL
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location: 39.73, -90.23     debug


Area Discussion for - Central Illinois, IL
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Fxus63 kilx 180240
afdilx
area forecast discussion
national weather service lincoln il
840 pm cst Wed jan 17 2018

Update
Issued at 840 pm cst Wed jan 17 2018
the winds will remain steady from the southwest in the 10-15 mph
range tonight, in response to a persistently tight pressure
gradient. Illinois will be positioned between a clipper-like low
progressing across southern canada into western ontario, while an
expansive surface high pressure shifts south of illinois toward
the gulf of mexico. A 40kt low level jet will affect NE illinois
overnight, as possibly as far south as the i-74 corridor with
turbulent low level winds. Surface gusts to 20 mph could develop
at times after midnight, but stronger gusts should hold off until
mid-late morning tomorrow.

Despite very little cloud cover tonight, hourly temperatures look
to be nearly stationary due to steady SW winds, and warming mid-
level temperatures. One fly in the ointment is that our SE areas
with snow cover already dropped to near or below forecast lows
due to initial decoupling of the winds over deeper snow.

Therefore, the main update this evening will be to do slight
warming in the w-nw areas where warmer air will arrive first, and
slight cooling in the SE counties.

A more noticeable warming trend will start on Thursday, as highs
climb to freezing or above for the first time in a few days. Even
warmer temps are on tap for fri-sat-sun, with increasing rain
chances late this weekend.

Short term (this evening through Thursday)
issued at 153 pm cst Wed jan 17 2018
with high pressure drifting into the lower mississippi valley,
winds have started to turn southwest across central illinois.

A tightening pressure gradient will keep the speeds up somewhat
overnight, which should help keep temperatures from free-falling.

Lows should be 10-15 degrees (above zero), coldest over the south
where the winds will be lighter. The warming trend should begin in
earnest on Thursday, as temperatures reach above freezing over the
cwa. Mostly clear skies are expected to prevail through the
period.

Long term (Thursday night through Wednesday)
issued at 153 pm cst Wed jan 17 2018
upper ridging will build eastward through the end of the week,
with the warming trend continuing. Little change needed for
temperatures through the weekend, with 40s returning Friday and
most areas in the 50s by Sunday.

Main concern during the period remains with the late weekend storm
system. An upper level trough will dig across the southwest u.S.

Early in the weekend, with a low closing off on Sunday over the
central plains. The latest GFS is a bit quicker than the european
or canadian models on the speed of this low lifting northeast.

This results in the cold front coming through late Sunday night
vs. Monday morning. While the shear with this front is fairly
decent, the timing results in little in the way of instability.

Can't rule out a few rumbles of thunder, but chances are low
enough to keep a mention out of the forecast at this point.

Highest rain chances will be Sunday night into Monday morning.

However, wraparound moisture will keep some scattered rain or snow
showers lingering into early Tuesday.

Aviation (for the 00z tafs through 00z Thursday evening)
issued at 600 pm cst Wed jan 17 2018
the cold dry air mass will produce nearly cloud-free skies over
the next 24 hours. The main issue tonight will be the potential
for llws conditions, mainly for our northern terminals. A speed
max between 925-850mb will advance across northern illinois, with
the 40kt contour down to the pia and bmi areas 04z and 15z. Have
continued with llws in those two tafs, but may be adding the other
sites based on vad wind observations and rap hrrr updates. Bufkit
analysis show the remaining terminals only a few knots below 40kt
at 1000ft agl.

After initial decoupling of the winds early this evening, surface
winds look to increase from the southwest to 10-14kt for a
majority of the night. After sunrise tomorrow, and an increasing
mixing heights, wind gusts could increase over 20kt at times.

Ilx watches warnings advisories
None.

Update... Shimon
short term... Geelhart
long term... Geelhart
aviation... Shimon


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Jacksonville Municipal Airport, IL3 mi30 minSW 910.00 miFair16°F8°F70%1029.8 hPa

Wind History from IJX (wind in knots)
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Last 24hrW7W5SW4W5W5SW4SW5SW4SW4W6SW5SW9SW8W9SW12
G15
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1 day agoW11W12
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2 days agoS11
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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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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Central Illinois, IL (0,6,7,8)
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Ground Weather Radar Station Central Illinois, IL
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weather_mapweather_map weather_map

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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.