Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Portage Des Sioux, MO

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:14AMSunset 7:54PM Saturday August 17, 2019 11:50 AM CDT (16:50 UTC) Moonrise 8:22PMMoonset 7:04AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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 Portage Des Sioux, MO
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location: 38.94, -90.3     debug


Area Discussion for - St. Louis, MO
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Fxus63 klsx 171130
afdlsx
area forecast discussion... Updated aviation
national weather service saint louis mo
630 am cdt Sat aug 17 2019

Short term (through late Sunday afternoon)
issued at 350 am cdt Sat aug 17 2019
main concern in the short term is the potential for severe weather
and flooding this morning. Will leave the flash flood watch in
effect through this morning.

Showers and thunderstorms continue to develop across western
missouri and kansas early this morning in an area of strong 925-
850mb moisture convergence just north of a surface warm front. These
clusters of storms will move east over the next few hours as the
nose of the 40kt low level jets veers to the east. This will bring
the storms through the CWA between 4-10 am. There is still some
potential for a few severe thunderstorms given the latest
objective analysis depicting mucapes over the area between
1000-2000 j kg and deep layer shear of 40-50kts suggesting that a
few cells could produce large hail and damaging winds. In
addition, will leave the flash flood watch in place given forecast
pwats near 2.0" and deep layer cloud layers of 13.0k ft. This
indicates that the storms will be very efficient rain producers.

In addition, there will be the potential for training, hence the
concern for flash flooding. Thunderstorms will move east and
diminish by mid morning as the low level jet weakens and continues
to veer to the east.

The front will move north during the day, but the atmosphere will
become capped, so will only carry a slight chance of thunderstorms
over northeast missouri and west central illinois. The chance for
thunderstorms will increase tonight as the GFS nam are in decent
agreement that another shortwave trough will move across the
midwest late tonight into early Sunday. There will be sufficient
instability moisture transport ahead of the attendant cold front
to go with likely pops over central and northeast missouri as well
as west central illinois with chance pops elsewhere. The chance
of thunderstorms will continue along the front in a very unstable
atmosphere into Sunday afternoon.

Britt

Long term (Sunday night through Friday)
issued at 350 am cdt Sat aug 17 2019
main concern for next week is the potential for heat on Monday and
Tuesday. The deterministic global models as well as the GEFS mean
continue to show an upper high building across the central conus.

While this will cause heights to rise which will suppress
convective development development, the GFS and canadian is
showing a low level front stalling over the area which will act
for the focus for some thunderstorm development which lends to
forecast uncertainty. The ECMWF and GFS are depicting 850mb
temperatures in the lower 20s c which support surface temperatures
in the 90s, and a surface boundary could cause pooling of
dewpoints in the 70s. This would result in heat index values
reaching 105 in some areas both Monday and Tuesday assuming that
enough thunderstorms do not develop either day.

By Tuesday night and Wednesday, a shortwave trough will move
through the midwest in the northwesterly flow aloft bringing a
chance of showers and thunderstorms. Cooler air will move in
behind the attendant cold front causing temperatures to fall
closer to normal. Another system late in the week will bring
another chance of showers and thunderstorms.

Britt

Aviation (for the 12z tafs through 12z Sunday morning)
issued at 612 am cdt Sat aug 17 2019
showers and thunderstorms are expected to move through all of the
terminals over the next 1-3 hours. Thunderstorms will bring
MVFR ifr ceilings and visibilites, hail, and wind gusts to
30-40kts. This activity will move out of the terminals by 15z, and
then dry andVFR conditions are then expected through at least
late tonight before additional showers and thunderstorms move into
central and northeast missouri and west central illinois affecting
kuin and possibly kcou after 09z. There also may llws set up by
06z tonight.

Specifics for kstl:
showers and thunderstorms are expected to move through the
terminal through 15z with MVFR ifr ceilings and visibilites and
wind gusts to 30kts. Then dry andVFR conditions are expected the
rest of the period with light winds.

Britt

Lsx watches warnings advisories
Mo... Flash flood watch until 1 pm cdt this afternoon for audrain mo-
boone mo-callaway mo-knox mo-lewis mo-marion mo-monroe mo-
montgomery mo-pike mo-ralls mo-shelby mo.

Il... Flash flood watch until 1 pm cdt this afternoon for adams il-
brown il-pike il.

Wfo lsx


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St. Louis Regional Airport, IL13 mi61 minESE 1110.00 miOvercast73°F73°F100%1013.9 hPa
St. Louis Lambert International Airport, MO13 mi60 minS 910.00 miMostly Cloudy77°F71°F82%1012.5 hPa

Link to 5 minute data for KSET

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Tide / Current Tables for
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Weather Map and Satellite Images
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GOES 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.
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Wind Forecast for St. Louis, MO (12,3,4,5)
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Ground Weather Radar Station St. Louis, MO
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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.