Monday, August21, 2017

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 6:17AMSunset 7:50PM Sunday August 20, 2017 11:42 PM CDT (04:42 UTC) Moonrise 3:55AMMoonset 6:14PM Illumination 1% Phase: Waning Crescent; Moon at 29 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 210316
area forecast discussion
national weather service lincoln il
1016 pm cdt Sun aug 20 2017

Issued at 1014 pm cdt Sun aug 20 2017
spotty thunderstorms are possible across central and southeast
illinois overnight, although most locations will remain dry.

Otherwise, warm and humid conditions are expected. Made some
tweaks to pops for the expected trends, but most other adjustments
were very minor.

Short term (this evening through Monday)
issued at 305 pm cdt Sun aug 20 2017
old outflow from an earlier MCS was moving east near i-57 at mid
afternoon and had an isolated thunderstorm along it in west
central clay county. A few showers were in eastern marshall and
woodford counties while more widespread in northern NW il closer
to MCV over east central ia. More widespread thunderstorms were
over SW ia into northern NW mo and in southern mo and NE ar. More
sunshine in eastern il while more clouds west of i-57 behind
outflow boundary. Temps at 20z 3 pm ranged from around 80f north
of peoria to the lower 90s from effingham to lawrenceville south
where heat indices were topping 100f with muggy dewpoints in the
low to mid 70s. Dewpoints around 70f were as far north as
galesburg and lacon.

Latest forecast models still have varying solutions with handling
convection through Monday over il. The MCV over east central ia is
forecast to track east toward chicago in NE il by late evening
with its swirl of convection mainly impacting northern half of il.

Also have the system in northern NW mo that tracks into SW il
after sunset and to give southern counties some isolated
convection tonight. So have carried 20-30% pops over most of
central il tonight with only isolated convection in southeast il
until sunset due to old outflow boundary and very unstable
tropical airmass. SPC day1 outlook has marginal risk of severe
storms over all but SW 4 counties due to high capes above 1800
j kg from il SE (as high as 3000-4000 j kg in southeast il) while
slight risk of severe storms was over ia. Muggy lows tonight
around 70f.

Convection chances increase to between 20-40% during the day
Monday with highest pops NW CWA over il river valley. Another
very warm and humid day with highs in the upper 80s and lower 90s
and afternoon heat indices peaking from the mid 90s to near 100f,
highest in southeast il by lawrenceville. Sky cover during solar
eclipse around 18z 1 pm Monday is 50-70% with least amount of
clouds in southeast il and also the clouds will be higher in
southeast il with filtered sunshine. Solar eclipse peaks in our
area around 120 pm cdt with 93-97% of Sun covered by the moon.

Long term (Monday night through Sunday)
issued at 305 pm cdt Sun aug 20 2017
spc day2 outlook has marginal risk of severe storms from i-72
north on Monday night with slight risk of severe storms over parts
of knox, stark and marshall counties and to the nw. The marginal
risk of severe storms shifts to SE CWA on Tue from paris to
shelbyville SE while slight risk from lawrenceville SE during tue
afternoon. A cold front will track SE through central il on tue
likely bringing a round of showers and thunderstorms, and
lingering over southeast il southeast of i-70 early Tue evening.

Highs Tue of 80 to 85f with warmest temps in southeast il. One
more humid day on Tue with dewpoints in the upper 60s and lower

A nice stretch of late summer weather expected from Wednesday
through Sunday as large surface high pressure ridging from eastern
canada southwest into il, and upper level trof over the northeast
u.S. Expect below normal temperatures during most of this period
with highs in the upper 70s and lower 80s while fairly comfortable
dewpoints with east to NE flow around high pressure and giving
some cooler nights. 12z extended forecast models are showing some
qpf SE over the ohio river valley next Sunday afternoon and also
some QPF with low pressure system moving into the upper midwest,
with most of our CWA remaining dry yet on next Sunday. Some models
show temperatures warming into the mid 80s next weekend, but
stayed close to model consensus for temperatures along with dry

Aviation (for the 00z tafs through 00z Monday evening)
issued at 654 pm cdt Sun aug 20 2017
whileVFR conditions should prevail for a majority of the taf
valid time across the central illinois terminals, there is
potential for lower conditions to develop. Spotty thunderstorms
are possible over the next few hours, and again for much of the
day Monday. However, confidence in timing coverage is too low to
go above a vcts mention at this time. In addition, if skies can
clear sufficiently tonight, MVFR fog is possible by late tonight.

Generally light winds are expected through the period.

Ilx watches warnings advisories

Update... Bak
short term... 07
long term... 07
aviation... Bak

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Jacksonville Municipal Airport, IL3 mi67 minN 010.00 miFair71°F68°F92%1017.3 hPa

Wind History from IJX (wind in knots)
Last 24hrSE3SE3SE3CalmCalmCalmSE3S4S3S3NW5NW6NE7E3E11S8S6SW4CalmCalmNW6S3CalmS3
1 day agoSW4SW5CalmSW4NW3CalmCalmCalmCalmE3E3CalmNW3NW3SW4W6W6W3CalmCalmE5E4E5E4
2 days agoCalmSW3W4SW3SW4SW4SW3SW3W3NW4W4W4W4W7W5S8SW8SW9S6SW6S6SW5S4Calm

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
IR Satellite Image from GEOS

GOES Local Image of Midwest    EDIT

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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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 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 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.