Thursday, April27, 2017 L-36.com


Marine Weather and Tides
Winchester, MO

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 6:06AMSunset 7:52PM Thursday April 27, 2017 1:36 PM CDT (18:36 UTC) Moonrise 6:18AMMoonset 8:24PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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
    EDIT      (on/off)   Help
7 Day Forecast for Marine Location Near Winchester, MO
   Hourly   EDIT   Help
location: 38.58, -90.53     debug


Area Discussion for - St. Louis, MO
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 klsx 271147
afdlsx
area forecast discussion... Updated aviation
national weather service saint louis mo
647 am cdt Thu apr 27 2017

Short term (through late tonight)
issued at 407 am cdt Thu apr 27 2017
showers are in the process of moving out of CWA early this morning.

This is happening as the negatively tilted upper trough lifts
northeast into the great lakes this morning. Gfs/nam are showing a
shortwave ridge building into the area later today which will help
bring in some clearing temporarily. But then the next shortwave
trough will already be advancing into the central plains tonight.

Showers will develop by late this evening and overnight as moisture
convergence develops on the nose of the low level jet.

There will be cold air advection this morning before it ends as the
surface ridge axis passes to the east this afternoon. Highs will be
5-15 degrees cooler today than yesterday. There will not be much of
a diurnal change tonight with increasing clouds and winds
increasing from the south.

Britt

Long term (Friday through Wednesday)
issued at 407 am cdt Thu apr 27 2017
fri - Sun night
this is shaping up to be a very active prd with chances for strong
to svr tstms and a prolonged prd of heavy rainfall that will likely
worsen existing flooding and cause additional flooding through the
weekend and into next week as a strong phased storm system impacts
the cntrl conus.

Upper level system that will eventually drive the sfc low is just
now coming onshore across the pacific nw. Meanwhile, a short wave
rounding the base of the long wave trough will lift a weak sfc low
ne thru the fa. Both sfc and upper level systems will weaken thru
the day but will push a weak cold front thru the cwa. This bndry
will move thru the sthrn CWA drng the aftn with strong to svr tstms
possible. The bndry/outflow will sink S of the fa Fri night... But
not too far. The upper level system will dig S into nthrn nm fri/fri
night. After midnight... The LLJ begins ramping up with elevated
precip bcmng widespread across the sthrn CWA overnight. The ECMWF is
further N than the GFS with the bndry and assoc instability so can't
rule out elevated hailers. As the upper level low emerges into the
sthrn plains on sat... The sfc low will lift NE out of tx. The
ongoing precip may act to suppress the northward advancement of the
warm front but this just means that wherever that sets up will
receive an extended prd of heavy rainfall. The upper level low lifts
ne into the cntrl plains on Sun with the sfc tracking from NE tx to
ne mo by Sun evng. The warm front will be slow to move until the sfc
low moves N on sun. Expect persistent convection along the warm
front as it moves N thru the wknd. A continuous LLJ will provide a
constant supply of theta-e rich air from the caribbean. Dps in the
mid/upper 60s will help contribute to pwats in excess of 1.5" with
some indications of values approaching 2.0". These values are at
least 2-3 sds above normal. If pwats reach above 1.75"... It would
set a record for the season. Also, warm cloud depths are between 3.5-
4 km. These values would be impressive during the summer but are on
the far high side of the spectrum for this time of the year. The
combination of the strength and dynamics of the system and the heavy
rain parameters indicate that this could be a significant hydrologic
event. Therefore, will issue a flash flood watch from Fri evng thru
sun evng for widespread 2-5 inches with higher amounts possible
across SE mo and on into sthrn il. The heavy rain threat will come
to an end as the sfc cold front moves thru the CWA Sun aftn/evng and
the dry slot overspreads the region. Although SPC does not have the
fa outlooked on sun... Would expect a thin line of convection to form
along the cold front with wind being the primary threat. There will
also be plenty of gradient winds assoc with this system.

Mon - Mon night
caa will continue with wrap around precip possible across NE mo and w
cntrl il mon. The system becomes stacked early next week as the low
moves from the midwest to the grt lks. Temps will be 10-15 degrees
below normal mon.

Tue - wed
a short wave embedded in NW flow will deepen as it approaches the
region producing light precip. There are still significant
differences in model solutions drng this prd... But any addtnl precip
would not help any ongoing flooding.

2%

Aviation (for the 12z tafs through 12z Friday morning)
issued at 634 am cdt Thu apr 27 2017
MVFR ceilings currently at all of the terminals will move east
this morning. Then dry andVFR conditions are expected through
06z. Then another storm system will move into the area from the
west bringing additional showers and MVFR ceilings to the area
including kcou.

Specifics for kstl: MVFR ceilings will move out of the terminal
later this morning. Then dry andVFR conditions are expected
through at least 06z. Scattered showers will move into the area
with possible MVFR ceilings.

Britt

Lsx watches/warnings/advisories
Mo... Flash flood watch from Friday evening through late Sunday night
for audrain mo-boone mo-callaway mo-cole mo-crawford mo-
franklin mo-gasconade mo-iron mo-jefferson mo-lincoln mo-
madison mo-moniteau mo-montgomery mo-osage mo-pike mo-
reynolds mo-saint charles mo-saint francois mo-saint louis
city mo-saint louis mo-sainte genevieve mo-warren mo-
washington mo.

Il... Flash flood watch from Friday evening through late Sunday night
for bond il-calhoun il-clinton il-fayette il-greene il-
jersey il-macoupin il-madison il-marion il-monroe il-
montgomery il-randolph il-saint clair il-washington il.

Wfo lsx


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St. Louis, Spirit Of St. Louis Airport, MO8 mi42 minW 1310.00 miOvercast52°F42°F69%1008.4 hPa
St. Louis, Lambert-St. Louis International Airport, MO15 mi45 minW 1010.00 miOvercast53°F39°F59%1008.8 hPa
St. Louis Downtown Airport, IL20 mi43 minW 1110.00 miOvercast52°F39°F64%1008.8 hPa

Wind History from SUS (wind in knots)
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
Last 24hrS10S9SE6S45W4E3S5S6W13W10
G19
W10
G19
W9W8W13
G19
W13
G18
W7W8W9W8W10W11
G18
W14
G17
W12
G20
1 day agoS10S13
G23
SE17
G29
S14
G23
S16
G25
S12
G27
S9
G15
S5S5S5S6CalmS5S6S7S9W20
G31
S5S3SE3SW7SW10
G18
SW7SW4
2 days agoE84--S10SE8E9SE7E4SE4SE6CalmCalmS3S4S3CalmCalmCalmE45S9
G18
S6
G15
SE9
G17
SE8
G17

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for St. Louis, MO (14,3,4,5)
      (on/off)   Help

Ground Weather Radar Station St. Louis, MO
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.