Wednesday, September19, 2018 L-36.com


Marine Weather and Tides
Apple River, IL

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9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:42AMSunset 7:01PM Wednesday September 19, 2018 12:12 PM CDT (17:12 UTC) Moonrise 3:27PMMoonset 12:18AM Illumination 73% Phase: Waxing Gibbous; Moon at 10 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 Apple River, IL
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location: 42.44, -90.06     debug


Area Discussion for - Quad Cities, IA/IL
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Fxus63 kdvn 191654
afddvn
area forecast discussion
national weather service quad cities ia il
1154 am cdt Wed sep 19 2018

Hydrology update...

Synopsis
Issued at 332 am cdt Wed sep 19 2018
upper level ridging was centered over the southern plains this
morning with showers and storms over the ridge axis from south
dakota into iowa. Convection developed overnight on the nose of the
925mb southerly jet which pushed over a boundary sitting from near
omaha to keokuk on the southern edge of the surface high which was
centered over the great lakes. A line of showers was nearly
stationary for several hours in southeast iowa and northeast
missouri, which radar estimated 1 to 2 inches of rain fell in that
time. These showers and storms have now begun to move eastward into
illinois. The convection to the west and northwest will be the
concern for today's forecast.

Short term (today and tonight)
issued at 332 am cdt Wed sep 19 2018
the evolution of the convection now over northwest
into west central iowa this morning will be the primary concern for
today's weather. Fog this morning as well as hot temperatures will
be additional focuses for the forecast.

Starting with the fog, visibilities and ceilings have been jumping
around most of the overnight hours as no local areas have observed
any dense fog set in for the night. With light winds, expect lowered
visibilities for through sunrise or a few hours afterwards.

A warm front, which is currently over missouri into illinois will
lift north through the forecast area through the day today. There
will be a good focus for convergence on the nose of the low level
jet through the day today, and as the front lifts north, believe
this will generally be north of the forecast area. So, confidence is
higher on the bulk of storms today occurring over the northern part
of the forecast area into minnesota and wisconsin. However morning
activity should be across central iowa into west central illinois
then will lift northward into the afternoon. Precipitation chances
have trended in this manner for today's forecast.

Cloud cover and precipitation trends will impact high temperatures
today. Some areas will start out with partly sunny skies, but clouds
should increase as the convection to the west moves eastward. The
greatest amount of cloud cover is likely across iowa and the
northern half of the forecast area today, but the southern parts of
the area should clear out this afternoon. Have trended high
temperatures down a bit in the northern half of the forecast area
today, where mid to upper 70s are likely. To the south, thinking
highs will reach around 90. Low confidence on forecast dewpoints,
but if they hit the low 70s, heat indices will reach the upper 90s
today in some places.

For tonight, a shortwave trough will round the ridge axis and with a
good moisture feed from the low level jet, think wherever that focus
lies, storms will continue through much of the night. That being
said, there is good model agreement that this will generally be
north of the forecast area. With little to suggest the front will
move south later today and tonight, I think this is a viable
solution which would keep the local area capped overnight. That
being said, could see an outflow boundary push southward into the
area, which could cause some storms to develop into the northern
areas. For this reasoning, kept precipitation chances for areas
mainly north of interstate 80 overnight.

The main concern from storms today and tonight is going to be heavy
rain as precipitable water again sits from 1.75 to 2.00 inches.

Additionally, there looks to be abundant deep layer shear to suggest
a few storms could become organized with wind and hail being
additional threats.

Long term (Thursday through Tuesday)
issued at 332 am cdt Wed sep 19 2018
a significant cool down will occur following the passage of the cold
front Thursday night.

Thursday
assessment... High on well above normal temperatures and strong winds.

Low on rain chances.

Where the nocturnal thunderstorm complex develops Wednesday night
will be the key regarding rain chances for Thursday morning.

Internally, the models suggest the initiation point is northern iowa
or possibly southern minnesota with the complex moving east or east
northeast. If the initiation point(s) and track are correct then
Thursday would be dry for the entire area.

However, boundaries produced by the storm complex could move into
the northern half of the area and help generate convection (similar
to Tuesday morning).

Right now the model consensus has slight chance to chance pops
across the northeast half of the area Thursday morning with dry
conditions Thursday afternoon.

Very warm and windy conditions will be seen on Thursday. Cloud cover
from any morning storms may suppress temperatures across the north.

However, temperatures in the low 90s should be achievable across the
south half which could put records at risk. Refer to the climate
section for specific numbers.

Winds Thursday should easily be 20 to 30 mph with higher gusts due
to deep mixing and favorable wind profiles.

Thursday night
assessment... High confidence on a strong cold front moving through
the area. Medium confidence regarding the severe weather potential.

Thursday night the strong cold front moves through the area with
strong southerly winds ahead of the front. The models for several
days now have indicated the strongest forcing is along and behind
the front.

Right now the model consensus has chance pops for Thursday night.

However, a period of likely or even categorical pops would be
reasonable for a time Thursday night.

The timing of the front does raise questions regarding the overall
severe potential. However, given the energy potential that builds
during the day combined with the strong wind fields one cannot rule
out the possibility of severe storms occurring well after sunset.

Thus the slight risk for areas west of the mississippi looks
reasonable.

Friday and Friday night
assessment... High confidence
breezy and much cooler conditions will be seen across the area on
Friday as colder air pours into the area. Some lingering showers
will be possible for a time Friday morning in the far east and
southeast areas. However, the rest of the area will remain dry.

Chilly conditions will be seen Friday night across the area as high
pressure builds in and winds become light. Widespread 40s are
expected.

Saturday on...

Saturday through Sunday night
assessment... High confidence
cool canadian high pressure will move through the midwest and into
the ohio valley resulting in dry conditions with at or below normal
temperatures.

Monday through Tuesday
assessment... Low to medium confidence
Monday into Tuesday the models diverge on their respective solutions
in terms of specifics.

The ECMWF and to a lesser extent the cmc global have an upper level
disturbance moving through the area Monday Monday night generating a
round of rain followed by more rain with another significant cold
front on Tuesday.

The GFS has no upper level disturbance on Monday but does push the
first of two cold fronts through the area Monday afternoon night
followed by the more significant front on Tuesday.

As a result of these differences, the model consensus has slight
chance to chance pops Monday, chance pops Monday night, and slight
chance to chance pops on Tuesday.

Aviation (for the 12z tafs through 12z Thursday morning)
issued at 720 am cdt Wed sep 19 2018
MVFR and ifr conditions this morning should begin to improve as
the Sun comes up. Otherwise, brl and cid are the sites that have
the best chances to see storms today. Otherwise no other impacts
expected.

Hydrology
Issued at 1152 am cdt Wed sep 19 2018
one to three inches of rain has fallen in parts of north central
and northeast iowa over the past 24-36 hours. The current wpc
rainfall forecast through Thu morning has a 100-150 mile wide
swath of another 1 to 3 inches generally centered on and spanning
along the iowa minnesota border. For this reason, river forecasts
for the cedar river basin are forecast to rise above flood stage
in the day4 to day7 time frame. Due to the uncertainty of amounts
and placement of forecasted rainfall, I have issued new flood
watches for the cedar river at vinton, cedar rapids, and
conesville. I have also continued the flood watch on the iowa
river at marengo, which, although delayed 48 hours, still is
forecast to exceed its flood stage early next week.

As for current river flooding on the lower mississippi and rock
rivers, the levels on the mississippi at gladstone, burlington, and
gregory landing are expected to drop below their respective flood
stages tonight. However, the rock river at joslin will continue to
slowly fall; reaching its flood stage level Saturday.

Climate
Issued at 332 am cdt Wed sep 19 2018
record highs for september 19...

moline... ... ... 93 in 2013
cedar rapids... 98 in 1925
dubuque... ... ..94 in 1948
burlington... ..94 in 2013
record highs for september 20...

moline... ... ... 94 in 2017
cedar rapids... 93 in 1931
dubuque... ... ..92 in 1895
burlington... ..93 in 2017

Dvn watches warnings advisories
Ia... None.

Il... None.

Mo... None.

Synopsis... Brooks
short term... Brooks
long term... 08
aviation... Gibbs
hydrology... 14
climate... 08


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Tri-Township Airport, IL27 mi97 minN 010.00 miFair72°F64°F78%1016.9 hPa

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Last 24hrN11N10
G16
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----CalmS7CalmCalmN5CalmCalmCalmCalm--NE7NE5NE4NE3E6E8E4E4SE6
1 day agoW3W4CalmW3CalmW3CalmCalmCalmCalmCalmCalmN5CalmCalmCalmCalmCalmCalmN10
G17
NE10NE8E6NE6
2 days agoW4W5W6SW8SW6SW5SW4CalmCalmCalmCalmCalmCalmCalmCalmCalmN3N3CalmCalmCalmCalmCalmW3

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Wind Forecast for Quad Cities, IA/IL (13,3,4,5)
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Ground Weather Radar Station Quad Cities, IA
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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 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.