Saturday, April29, 2017 L-36.com


Marine Weather and Tides
Seadrift, TX

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 6:46AMSunset 8:04PM Saturday April 29, 2017 10:18 PM CDT (03:18 UTC) Moonrise 8:46AMMoonset 10:43PM Illumination 17% Phase: Waxing Crescent; Moon at 4 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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GMZ235 Bays And Waterways From Port Aransas To Port O'connor- 340 Pm Cdt Sat Apr 29 2017
.small craft advisory in effect through Sunday afternoon...
Tonight..South wind 20 to 25 knots becoming west 10 to 15 knots after midnight, then becoming north 20 to 25 knots late in the night. Bays choppy to rough. A slight chance of showers and Thunderstorms in the evening, then a chance of showers and Thunderstorms after midnight.
Sunday..North wind around 20 knots decreasing to 10 to 15 knots in the afternoon. Bays choppy to occasionally rough.
Sunday night..Northeast wind 5 to 10 knots shifting east after midnight. Bays smooth.
Monday..Southeast wind 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Bays slightly choppy to occasionally choppy.
Monday night..Southeast wind 10 to 15 knots. Bays slightly choppy to occasionally choppy.
Tuesday..Southeast wind 10 to 15 knots. Bays slightly choppy to occasionally choppy.
Tuesday night..Southeast wind 10 to 15 knots. Bays slightly choppy to occasionally choppy. A chance of showers.
Wednesday..South wind 10 to 15 knots. Bays slightly choppy to occasionally choppy. A chance of showers and Thunderstorms.
Wednesday night..East wind 10 to 15 knots becoming north 15 to 20 knots after midnight. Bays choppy to occasionally rough. A chance of showers and Thunderstorms.
Thursday..North wind 20 to 25 knots decreasing to 15 to 20 knots in the afternoon. Bays choppy to rough. A slight chance of showers and Thunderstorms.
Thursday night..North wind 10 to 15 knots. Bays slightly choppy to occasionally choppy.
GMZ200 340 Pm Cdt Sat Apr 29 2017
Synopsis for the middle texas coastal waters.. Strong onshore flow will continue through early tonight as a strong upper level disturbance enters texas from the west and northwest. Isolated to scattered showers and Thunderstorms are expected tonight through early Sunday in response to the upper level disturbance and the associated cold front. Strong offshore flow and much drier conditions will develop Sunday after frontal passage. Offshore flow will decrease Sunday night then become weak to moderate onshore by Monday as surface high pressure moves eastward across the western gulf of mexico and as surface low pressure develops over west texas. Another cold front will move into the region mid-week with strong offshore flow behind it once again.

7 Day Forecast for Marine Location Near Seadrift, TX
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location: 28.41, -96.71     debug


Area Discussion for - Corpus Christi, TX
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Fxus64 kcrp 300251 aab
afdcrp
area forecast discussion... Updated
national weather service corpus christi tx
951 pm cdt Sat apr 29 2017

Discussion
Several hazards ongoing at this time due to cold front, and
possibility of strong to perhaps severe convection exists as well.

As of now, cold front is progressing through the western parts of
the brush country. A surge of strong winds is occurring behind
this front. Northerly winds sustained around 30 mph with higher
gusts have been reported. As a result, a wind advisory was issued
for the western four counties, and may need to be expanded here in
a few hours.

Convection has been held at bay most of the evening due to the
cap. However, within the last hour or so, storms have developed
along the front across the far northern fringes of the area and
southwest over zapata county. Storms may continue to fire along
the front, with the best chances across the northern and northeast
parts of the area. These locations will have a risk of severe
storms with the main threats being large hail and damaging winds.

Will continue to monitor and see how trends evolve further to the
southwest and far south convection develops along line of storms
northwest of crp.

Marine headlines look to be in good shape with scas prior to and
behind the front. Will keep the high risk of rip currents in
effect until midnight for now.

Additional updates will likely be needed over the next several
hours.

Previous discussion /issued 717 pm cdt Sat apr 29 2017/
discussion...

updated for 00z aviation.

Aviation...

gusty winds will continue ahead of the front at ali/crp/vct. The
front will move through the region later this evening with
northerly winds increasing behind the front. There may be a quick
surge after the front where winds gust between 30 and 35 knots.

Chances for showers and storms will be most likely at vct, where
latest hi-res guidance continues to indicate line of convection
will move through around 06z. Confidence is too low to mention at
crp, but will monitor trends. A few hours of MVFR ceilings may
occur prior to the front, but expectVFR conditions shortly after
fropa. Clearing skies will continue to clear on Sunday, with
northerly winds around 15 knots, gusting between 20 and 25 knots
at times. Winds will subside towards the tail end of the
forecast.

Previous discussion... /issued 406 pm cdt Sat apr 29 2017/
short term (tonight through Sunday night)...

strong upper disturbance entering tx from the west/northwest with
dynamic tropopause descending to near 500mb near elp (gfs
deterministic/sport airmass rgb.) this upper system is predicted
to lift across NRN tx/srn plains during the period, with the
corresponding cold front moving across the CWA overnight then
offshore after 06z Sunday (gfs/nam deterministic.) nam
deterministic predict 4000-5000 j/kg capes over the ern CWA in
advance of the front, yet CIN values are predicted to increase
early tonight. Any surface-based convection will likely occur
only along the front which is expected to move across the cwa
generally 03-08z Sunday (generally consistent with deterministic
nssl wrf/texas tech wrf/nam simulated reflectively.) any
convection that develop will likely become strong. After fropa,
breezy conditions are expected over the CWA overnight with maximum
sref probabilities of 25kt sfc wind around 20 percent and nam
deterministic predict 20-30kt 925mb wind along with 0-1km lapse
rates near to less than dry adiabatic. Not confident enough to
issue a wind advisory for tonight for the period after fropa. Much
drier atmospheric conditions expected Sunday/Sunday night. Cooler
Sunday night with lows in the 50s over much of the cwa.

Marine/coastal... SCA conditions will persist overnight. Onshore
flow will subside 03-06z Sunday in advance of the front, yet seas
will remain high over the coastal waters. Strong offshore flow
expeced after FROPA early Sunday. Rip current risk upgraded to
high until 05z Sunday given current/expected swell height/period
magnitudes and strong onshore flow. Water level below cfw at bob
hall pier and expected to rise overnight yet not confident that
level will reach the critical threshold before strong offshore
flow develops. Thus, will not issue a cfw.

Long term (Monday through Saturday)...

a weak to moderate southerly flow on Monday will result in mush
warmer temperatures (back into the 90s for a lot of the area), but
dewpoints will remain low. By Monday evening, high pressure building
east and low pressure deepening to the northwest will shift winds to
a more onshore direction resulting in a quick increase in dewpoints
overnight. Temperatures continue to climb Tuesday and Wednesday as
mid levels warm on southerly flow.

Our next cold front is in the forecast mid-week. Some timing
differences do exist between models at this time, but a general
Wednesday night time frame is expected. Potential for strong
thunderstorms (mainly ne) will be dependent on the strength of the
cap and timing of front. Current GFS run has a relatively strong cap
around 850-800 mb up through about 00z, then some mid level cooling
erodes the cap right around surface frontal passage time. Will
likely be plenty of caps to work with, so will have to keep an eye
on this.

Latter half of the week will see cooler/drier conditions once again.

Highs back into the lower 80s for Thursday with lows in the 50s.

Slightly warmer by Friday, but just around seasonal normals.

Preliminary point temps/pops
Corpus christi 65 82 57 85 67 / 30 10 0 0 10
victoria 61 78 53 84 63 / 60 10 0 0 0
laredo 62 83 57 92 66 / 10 10 0 0 0
alice 64 84 54 89 64 / 20 10 0 0 10
rockport 65 78 61 82 71 / 50 10 0 0 0
cotulla 59 82 53 92 63 / 20 10 0 0 0
kingsville 65 84 57 88 65 / 20 10 0 0 10
navy corpus 66 78 63 81 72 / 30 10 0 0 10

Crp watches/warnings/advisories
Tx... High rip current risk until midnight cdt tonight for the
following zones: aransas... Calhoun... Kleberg... Nueces.

Gm... Small craft advisory until midnight cdt tonight for the
following zones: bays and waterways from baffin bay to port
aransas... Bays and waterways from port aransas to port
o'connor... Coastal waters from baffin bay to port aransas
out 20 nm... Coastal waters from port aransas to matagorda
ship channel out 20 nm... Waters from baffin bay to port
aransas from 20 to 60 nm... Waters from port aransas to
matagorda ship channel from 20 to 60 nm.

Tb/78... Short term


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SDRT2 - 8773037 - Seadrift, TX 0 mi48 min ESE 15 G 21 80°F 81°F1001.2 hPa
AWRT2 13 mi48 min SSE 19 G 22 79°F 80°F1000.5 hPa
PCNT2 - 8773701 - Matagorda Bay; Port O'Connor, TX 17 mi48 min SE 18 G 22 78°F 1001.2 hPa
VCAT2 17 mi48 min SE 19 G 21 79°F 80°F1001.4 hPa
MBET2 20 mi48 min S 19 G 22 78°F
MAXT2 - Mission-Aransas Reserve, TX 26 mi78 min 16 80°F 1000 hPa (+1.0)76°F
CPNT2 26 mi48 min SSE 17 G 20 79°F 80°F
RCPT2 - 8774770 - Rockport, TX 32 mi48 min S 20 G 25 80°F 80°F1000.2 hPa
MIST2 43 mi63 min SSE 20 79°F 1001 hPa77°F
ANPT2 43 mi48 min SE 20 G 25 78°F
RTAT2 - 8775237 - Port Aransas, TX 44 mi48 min SSE 12 G 18 79°F 79°F1000.7 hPa
PTAT2 - Port Aransas, TX 44 mi78 min SE 26 G 29 78°F 78°F999.9 hPa (+1.0)75°F
EMAT2 47 mi48 min SE 15 G 19 79°F 79°F1002.1 hPa

Wind History for Seadrift, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Lavaca - Calhoun County Airport, TX17 mi23 minSSE 10 G 145.00 miFog/Mist79°F76°F93%1003 hPa

Wind History from PKV (wind in knots)
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1 day agoSE13SE6CalmCalmCalmCalmCalmCalmCalmCalmSE10S12
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Tide / Current Tables for Seadrift, San Antonio Bay, Texas
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Seadrift
Click for Map
Sat -- 06:47 AM CDT     Sunrise
Sat -- 08:09 AM CDT     0.39 feet Low Tide
Sat -- 09:46 AM CDT     Moonrise
Sat -- 08:00 PM CDT     Sunset
Sat -- 10:50 PM CDT     0.73 feet High Tide
Sat -- 11:43 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.70.60.60.50.50.40.40.40.40.40.50.50.50.60.60.60.60.70.70.70.70.70.7

Tide / Current Tables for Port Lavaca, Lavaca Causeway, Matagorda Bay, Texas
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Port Lavaca
Click for Map
Sat -- 04:50 AM CDT     0.28 feet Low Tide
Sat -- 06:46 AM CDT     Sunrise
Sat -- 09:45 AM CDT     Moonrise
Sat -- 04:24 PM CDT     1.42 feet High Tide
Sat -- 08:00 PM CDT     Sunset
Sat -- 11:43 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.60.50.40.30.30.30.40.50.70.811.11.21.31.41.41.41.41.31.31.21.11

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of SouthCentralPlains    EDIT
Geos

Wind Forecast for Corpus Christi, TX (23,6,7,8)
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Ground Weather Radar Station Corpus Christi, TX
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weather_mapweather_map weather_map

Gulf Stream Current


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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.