Saturday, February23, 2019 L-36.com


Marine Weather and Tides
Longview, TX

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 6:52AMSunset 6:12PM Saturday February 23, 2019 3:24 PM CST (21:24 UTC) Moonrise 10:55PMMoonset 9:47AM Illumination 80% Phase: Waning Gibbous; Moon at 19 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 Longview, TX
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location: 32.58, -94.7     debug


Area Discussion for - Shreveport, LA
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Fxus64 kshv 231842 aaa
afdshv
area forecast discussion... Updated
national weather service shreveport la
1242 pm cst Sat feb 23 2019

Update
Quick zone update just sent for the new tornado watch #5 now in effect
until 02z this evening for the ERN sections of ncntrl la. However,
given the rapid movement of the dryline, the severe threat will
quickly diminish through mid-afternoon, and thus the watch will be
cancelled early once the convection dry line push E through these
areas, thus stablizing the air mass. No other changes are needed
attm, as the forecast remains in good shape.

15

Prev discussion issued 1159 am cst Sat feb 23 2019
aviation...

a line of thunderstorms currently along a line from magnolia
arkansas to zavalla texas continues to rapidly move eastward.

Thunderstorms will be possible at keld kmlu over the next 2-3
hours.VFR conditions will continue to move into the TAF sites
behind the line of convection along with gusty southwest winds
15-20 mph with gusts near 30 mph. Winds will eventually become
northwesterly behind a cold front that will begin to move into
the region just after 24 03z and eventually clear all sites by
24 07z. 20
prev discussion... Issued 955 am cst Sat feb 23 2019
short term... This afternoon
the morning sfc analysis indicates that the dry line has begun to
surge E into the WRN sections of E tx, with a narrow band of
convection having recently organized near and just ahead of this
bndry over extreme ERN tx and SW ar. The warm front has shifted n
into the NRN sections of SW ar this morning, with the morning
special 15z RAOB from ulm revealing the low level inversion has
been lost across the warm sector in ncntrl la, but mlcapes are
struggling to get much above 1000 j kg attm, with a good portion
of this elevated over all but cntrl la given the nearly saturated
air mass at the sfc. The mesoanalysis depicts that the h700-500
lapse rates have backed off a bit since earlier this morning, but
still averaging about 7c km across the warm sector. However, the
water vapor imagery depicts the apex of the negative tilt
trough 140kt upper jet streak now quickly lifting NE from nne tx
into SE ok, which will quickly lift into WRN ar by midday. Thus,
the better upper level energy forcing looks to quickly shift ne
into ar the mid-south region especially by midday, but adequate
instability and strong shear profiles still suggest a svr threat
especially over NRN la scntrl ar late this morning through the
early afternoon.

Strong wsw winds will mix down with the dry line passage later
this morning early afternoon, and thus have posted a lake wind
advisory areawide through 00z Sunday. The ERN zones (ncntrl la)
will be more marginal for an advisory, but with the recent loss of
the low level inversion and the potential for some of the stronger
winds with the 50kt srly LLJ expected to mix down as well before
the convection arrives, have opted to include them as well. Did
not make any changes to temps and pops, as they look good.

Zone update already out... Grids should now be available.

15

Preliminary point temps pops
Shv 73 42 60 38 0 0 0 0
mlu 77 44 60 36 90 0 0 0
deq 70 36 58 34 0 0 0 0
txk 72 38 58 35 0 0 0 0
eld 73 40 59 35 70 0 0 0
tyr 71 40 60 39 0 0 0 0
ggg 72 40 60 38 0 0 0 0
lfk 73 42 63 40 0 0 0 0

Shv watches warnings advisories
Ar... Lake wind advisory until 6 pm cst this evening for arz050-051-
059>061-070>073.

La... Lake wind advisory until 6 pm cst this evening for laz001>006-
010>014-017>022.

Ok... Lake wind advisory until 6 pm cst this evening for okz077.

Tx... Lake wind advisory until 6 pm cst this evening for txz096-097-
108>112-124>126-136>138-149>153-165>167.

15


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Longview - East Texas Regional Airport, TX14 mi32 minSW 16 G 2710.00 miFair69°F34°F27%1009.1 hPa
Gilmer, Fox Stephens Field - Gilmer Municipal Airport, TX16 mi30 minSW 7 G 1810.00 miOvercast68°F31°F26%1009.1 hPa
Marshall, TX21 mi50 minW 12 G 2010.00 miFair70°F32°F25%1010.2 hPa

Wind History from GGG (wind in knots)
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Last 24hrE7E6E8SE6N5NE55E6E6CalmCalmCalmE3NW3CalmCalmE4SE3E4E3CalmCalmCalmW4
1 day agoE8NE7E7E8E10NE10E12
G20
NE10E9E10E10E8E8E8E9E11E8E6E5E4N6NE63E3
2 days ago--W12NW9W7W5W55NW5CalmNW3CalmS3CalmCalmCalmCalmCalmCalmCalmCalmN4SE5E6NE6

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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wmap_A
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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Shreveport, LA (16,3,4,5)
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Ground Weather Radar Station Shreveport, LA
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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.