Tuesday, May21, 2019 L-36.com


Marine Weather and Tides
Portage Des Sioux, MO

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:41AMSunset 8:13PM Tuesday May 21, 2019 1:42 AM CDT (06:42 UTC) Moonrise 10:07PMMoonset 7:00AM Illumination 95% 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 210555
afdlsx
area forecast discussion... Updated aviation
national weather service saint louis mo
1255 am cdt Tue may 21 2019

Update
Issued at 945 pm cdt Mon may 20 2019
grids have been updated to better reflect the spatial extent
(central into NE mo) and character (shra with embedded tsra) of
precipitation across the western part of the lsx cwa.

Kanofsky

Short term (through late Tuesday night)
issued at 326 pm cdt Mon may 20 2019
elevated convection will spread eastward into our forecast area
later this evening and overnight as a strong southerly low level jet
brings relatively strong low level warm air advection, theta-e
advection and moisture convergence particularly to northeast and
central mo into west central il where the highest QPF is expected.

Some locally heavy rainfall is possible in this area. The surface
wind will actually strengthen late tonight as the surface
pressure gradient tightens between the surface ridge over the
great lakes region and the developing surface low over the ok
panhandle region. Will get a break in the convection late Tuesday
morning and early afternoon, then a line of severe convection will
move rapidly eastward through our forecast area late Tuesday
afternoon and evening as a warm front lifts northward through our
region with increasing surface dew points and instability along
and south of the front while a surface trough... Dry line
approaches from the west. There will be strong low-mid level wind
shear due to an 80 kt mid level wind MAX east-southeast of the
negatively tilted upper level trough low along with at least
modest instability. The primary threats will be damaging winds and
tornadoes. Even outside of the storms the winds will be very
strong and gusty Tuesday afternoon and early evening. Convection
should weaken late Tuesday night, but will continue across
southeast mo and southwest il.

Gks

Long term (Wednesday through next Monday)
issued at 326 pm cdt Mon may 20 2019
warmer temperatures are forecast for Wednesday as upper level
heights slowly rise coupled with south southwest surface low
level winds. Another round of convection is likely Wednesday night
into Thursday morning along a weak cold front which will drop
southeastward into our forecast area. It looks like the highest
chance for showers storms will be across northeast mo and west
central il. The warming trend will continue as an upper level
ridge builds into mo and il from the southeastern us. Northeast mo
and west central il will be the most likely area for convection
Friday and into the weekend as this upper level ridge flattens
some with weak synoptic fronts or thunderstorm outflow boundaries
sagging southward into this area along with weak "ridge runner"
shortwaves over-topping the upper level ridge in this area.

Gks

Aviation (for the 06z tafs through 06z Tuesday night)
issued at 1211 am cdt Tue may 21 2019
specifics for kcou, kuin: a broad area of rain with scattered
embedded thunderstorms was affecting kcou and kuin at taf
issuance. Rain will continue at both terminals until the parent
thunderstorm complex has moved farther away from the region. After
a break in the rain after 21 14z, another line of tsra is
expected to develop and move through the terminals after 21 19z.

Winds will be gusty even outside of thunderstorms, and both the
wind speeds and the wind gusts will tend to increase with time.

InitiallyVFR ceilings are expected to fall to MVFR at both
terminals by 21 12z.

Specifics for kstl, ksus, kcps: the northern end of a line of
thunderstorms was located over central mo at TAF issuance. This
line will continue moving eastward over the next few hours,
accompanied by a broader area of shra with scattered embedded
tsra. Winds will be gusty outside of the thunderstorms, and the
wind speeds and gusts will tend to increase with time during the
valid TAF period because wind speeds aloft will be increasing.

After a break in the rain during the day, another line of tsra is
expected to develop and move through the terminals after 21 22z.

Kanofsky

Lsx watches warnings advisories
Mo... None.

Il... None.

Wfo lsx


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St. Charles, St. Charles County Smartt Airport, MO7 mi48 minENE 18 G 2910.00 miLight Rain and Breezy54°F46°F75%1013.3 hPa
St. Louis Regional Airport, IL13 mi47 minENE 15 G 2410.00 miOvercast54°F46°F78%1014.2 hPa
St. Louis Lambert International Airport, MO13 mi51 minE 18 G 2910.00 miLight Rain and Breezy57°F46°F67%1012.4 hPa

Wind History from SET (wind in knots)
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Last 24hrNW4NW4N10N7N4NW6NW6NW4NW7NW6NW4CalmW5NW5N7NE10NE12NE12NE14
G21
NE12NE11NE13NE18
G24
E18
G29
1 day agoSW14
G23
S5S14S9S13S12
G18
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G21
S16
G24
SW14
G22
W13
G19
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G25
W16
G29
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G35
W18
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W13W13
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G27
NW11
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NW9NW11NW5SW3
2 days agoS3S5S5S4S5S7S9S17
G26
SW20
G26
S20
G26
SW19
G30
S19
G28
S16
G29
S19
G27
S22
G30
S12
G24
S17
G28
S17
G27
S13
G23
SW9SE8SE13S9S9

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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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 (2,6,7,8)
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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.