Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Jacksonville, IL

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:56AMSunset 7:18PM Thursday March 23, 2017 1:18 AM CDT (06:18 UTC) Moonrise 3:17AMMoonset 1:43PM Illumination 20% Phase: Waning Crescent; Moon at 25 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 230409
afdilx
area forecast discussion
national weather service lincoln il
1109 pm cdt Wed mar 22 2017

Update
Issued at 830 pm cdt Wed mar 22 2017
a chilly evening across central illinois as a large canadian high
pressure system slowly edges away from the state. This large fair
weather system brought copious amounts of sunshine today but
rather cool temperatures to most of the area with afternoon highs
ranging from around 40 over in danville to 51 degrees in flora.

Clouds were on the increase across the region this evening as the
low level flow shifts into a southeasterly direction, which will
eventually bring much warmer air into the state late Thursday and
especially on Friday. With the low and mid level warm advection
pattern well underway just out to our west, we can expect the
clouds to continue to slowly increase overnight with a few showers
developing across missouri by Thursday morning. Some of those
will edge into parts of west central illinois during the morning,
but will encounter a very dry air mass as they track east of the
mississippi river, but warrant at least low chance pops during the
day Thursday.

Despite the gradual increase in high and mid level clouds,
temperatures have dropped off a bit quicker than earlier thought,
especially across the east where the clouds were not as thick.

However, the combination of the increase in cloud cover in the
east the rest of this evening along with the wind staying up just
enough overnight should keep the temperatures in check for the
rest of the night. Have made the usual tweaks to the early evening
temperatures, but other than that, no other adjustments were
needed to the evening grids that would require a zfp update at
this time.

Short term (this evening through Thursday)
issued at 315 pm cdt Wed mar 22 2017
19z/2pm surface analysis shows 1039mb high centered over the great
lakes, with cool/dry northeasterly flow noted across central
illinois. As the high edges eastward, mid/high clouds currently
across iowa/missouri will gradually spread into the area tonight.

Skies will initially start out mostly clear during the early
evening, but will then become overcast overnight. Low
temperatures will be coldest across the northeast kilx CWA around
paris and danville, where skies will remain clear longest and
readings will drop into the upper 20s. The warmest lows in the
middle 30s will be focused across the southwest CWA where clouds
will increase soonest.

As the high moves further away from the region and boundary layer
winds veer more southerly, warm air advection will increase markedly
on Thursday. Models continue to produce light QPF across parts of
the area: however, boundary layer airmass will initially be quite
dry, so think they may be too fast spreading precip eastward. As
such, have kept locations east of i-55 dry through the morning
hours. Have focused highest pops in the illinois river valley
Thursday afternoon, with dry conditions expected through the entire
day south of i-70. High temperatures will top out in the lower to
middle 50s.

Long term (Thursday night through Wednesday)
issued at 315 pm cdt Wed mar 22 2017
vigorous short-wave trough noted on latest water vapor imagery off
the coast of southern california will cross the rockies, inducing
surface cyclogenesis over eastern colorado Thursday night. As has
been the case with the past several model runs, 12z mar 22 models
continue to show the short-wave closing off at 500mb... Resulting in
a slower eastward progression of the wave and its associated surface
low. As a result, confidence is growing that any precip associated
with the slowly approaching system will hold off until Friday night.

Ahead of the wave, partial sunshine and southerly winds will help
boost high temperatures well into the 70s on Friday. All models
suggest precip will arrive across the illinois river valley Friday
evening... Then spread across the remainder of the area overnight.

Gfs MUCAPE values remain negligible, so have opted to only mention
isolated thunder with the initial wave of precip. As the system
comes overhead, mucapes increase to 500-1000j/kg and mid-level lapse
rates steepen by Saturday afternoon, warranting an increased thunder
threat. Will maintain high pops and thunder chances throughout the
day and into Saturday evening... Before rain chances gradually
decrease from southwest to northeast across the area on Sunday.

After a brief lull in the rain chances Sunday night, the next
southern stream system will quickly spread showers back into the
area on Monday. This feature has trended south with the past few
model runs, so have concentrated highest pops and isolated
thunder mention across the southern cwa. After that,
considerable model spread exists for the end of the period... So
forecast confidence is low beyond Monday. At this time, it
appears Tuesday will be a dry day before another system approaches
by the middle/end of next week. Timing of that system is very
much in doubt, with the GFS delaying it until next Friday... While
the ecmwf/gem are both more aggressive with its eastward progress
as early as Wednesday. Will only carry slight chance pops for
Wednesday until better model agreement is achieved.

Aviation (for the 06z tafs through 06z Thursday night)
issued at 1105 pm cdt Wed mar 22 2017
vfr conditions are expected this forecast period, although cigs
will drop to lowVFR (3500-4000ft) tomorrow morning as isolated
showers track over west central il. The threat for showers will
gradually work their way north during the afternoon and out of our
area by early evening. Coverage of any rain tomorrow looks too
isolated at this point to mention much more than vcsh. One the
showers move north of the area late tomorrow afternoon or early
evening, mainly high level cloud cover is expected across the
forecast area. Llws potential will increase across the area after
03z as southerly winds increase to 45 kts at the 2000 foot level.

Surface winds tonight will remain out of the east at 8 to 15 kt
range with winds veering more into the southeast at 12 to 17 kts
with gusts around 20 kts at times tomorrow afternoon through
tomorrow evening.

Ilx watches/warnings/advisories
None.

Update... Smith
short term... Barnes
long term... Barnes
aviation... Smith


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Jacksonville Municipal Airport, IL3 mi24 minE 1010.00 miPartly Cloudy36°F20°F55%1028.1 hPa

Wind History from IJX (wind in knots)
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Last 24hrN10
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1 day agoN4NE6NE5NE4N7N5N6N8NE8NE10NE17
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
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IR Satellite Image from GEOS
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GOES Local Image of Midwest    EDIT
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Wind Forecast for Central Illinois, IL (2,6,7,8)
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Ground Weather Radar Station Central Illinois, IL
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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.