Thursday, January18, 2018 L-36.com


Marine Weather and Tides
Port Isabel, TX

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 7:16AMSunset 6:04PM Thursday January 18, 2018 7:28 AM CST (13:28 UTC) Moonrise 8:20AMMoonset 7:37PM 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
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GMZ130 Laguna Madre From The Port Of Brownsville To The Arroyo Colorado-laguna Madre From The Arroyo Colorado To 5 Nm North Of Port Mansfield Tx-laguna Madre From 5 Nm North Of Port Mansfield To Baffin Bay Tx- 351 Am Cst Thu Jan 18 2018
Today..North winds 10 to 15 knots. A moderate chop on the bay. Chance of rain.
Tonight..North winds 5 to 10 knots. A light chop on the bay. Rain showers likely.
Friday..Northwest winds 5 to 10 knots. A light chop on the bay. Rain showers likely.
Friday night..Southeast winds around 5 knots shifting south after midnight. Smooth on the bay. Chance of rain showers in the evening, then slight chance of rain showers after midnight.
Saturday..South winds 10 to 15 knots. A moderate chop on the bay.
Saturday night..Southeast winds 10 to 15 knots. A moderate chop on the bay.
Sunday..South winds 15 to 20 knots. Choppy on the bay. Slight chance of showers.
Sunday night..Southwest winds 10 to 15 knots shifting northwest after midnight. A moderate chop on the bay.
Monday..North winds 15 to 20 knots. Choppy on the bay.
Monday night..Northeast winds 5 to 10 knots. A light chop on the bay.
GMZ100 Synopsis For Baffin Bay To Rio Grande Out 60 Nm- 351 Am Cst Thu Jan 18 2018
Synopsis..Winds and seas along the lower texas coastline will improve today with winds shifting to the northeast and east during the day. Coastal troughing will strengthen through Friday with persistent onshore flow maintaining moderate seas into the weekend with drizzle and light rain likely. A cold front will move the area late Sunday with small craft advisory conditions possible on Sunday prior to the passage and behind the front into Monday.

7 Day Forecast for Marine Location Near Port Isabel, TX
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location: 26.06, -97.22     debug


Area Discussion for - Brownsville, TX
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Fxus64 kbro 181214 aaa
afdbro
area forecast discussion... Updated
national weather service brownsville tx
614 am cst Thu jan 18 2018

Discussion Updated for latest aviation discussion below.

Aviation A strong and broad 500 mb closed low moving in from
the west in combination with a surface trough of low pressure
near the lower tx coastline will result in steadily degrading
aviation conditions today for the lower rgv airports. Surface obs
from all three rgv airports show that ceilings have fallen down to
MVFR levels this morning. The pcpn chances will increase due to
the influence of both the surface and 500 mb systems over the next
24 hours which will result in the ceilings and vsbys falling into
ifr lifr teritory later in the TAF forecast period.

Prev discussion issued 441 am cst Thu jan 18 2018
short term (now through Friday): surface obs from around the region
show that temps from all of the region remain just above freezing in
the mid 30s. Some areas of near freezing temps will still be
possible over the next several hours before sunrise as weak caa
continues at the surface. So will maintain the freeze warning in
place over most of the region through 10 am with the main threat now
likely shifting to the northern ranchlands. '
surface obs near the coastline show that a fairly brisk northerly
wind is lingering there which will combine with the low morning
temps to allow the wind chil values to bottom out once more today
mainly near the coastline.

Kbro radar has been detecting some very light echoes over the lower
rgv this morning with none of the surface obs verifying that pcpn
has not been reaching the ground. Expect the pcpn to start gradually
spreading out across deep south tx and the rgv throughout today and
tonight as a 500 mb trough digs across southern tx and northeastern
mex from the west and surface troffing develops and hangs near the
lower tx coast. The short term model guidance is in pretty good
agreement in ramping up the pops throughout tonight and Fri and will
go with a three way blend of the model pops through this short term
period.

The cold airmass should start moderating steadily as the CAA weakens
finally over the region and the winds shift around the a milder ne
direction on fri. Both the GFS and ECMWF models pick up on this
trend and push the highs today and Friday back up into the 40s 50s
today and Friday. The NAM is the coldest of the three short term
model sets and hold the highs in the low 40s today and tomorrow.

This looks a bit too cool considering the shift in the
overall pattern so will go closer to a blend of the GFS and ecmwf.

Overall confidence in the short term temps and pops is above
average.

Long term (Friday night through Wednesday): drier air spreads
across deep south texas Friday night as the mid to upper level
trough axis moves east of the region and the coastal trough weakens.

Very light winds and warm air advection begins above the surface,
may support some dense fog late Friday night into mid morning
Saturday. However, due to some uncertainties, will not mention in
the grids at this time.

Surface high pressure moves east on Saturday allowing southerly flow
to return across the area. Above normal temperatures are expected
across the region through most of the weekend. High temperatures
Saturday will be in the 70s with a mix of Sun and clouds. Saturday
night will be mild with low temperatures Saturday night mainly in
the 60s. Sunday will be breezy, especially near the coast, as the
pressure gradient strengthens. Sunday will be warm and breezy with
highs mainly be in the 80s. The next cold front arrives Sunday night
bringing cooler and drier air behind it. The latest GFS remains
slightly faster than the ecmwf, so will leave the midnight frontal
passage timing for now. Some showers are possible, especially
across the coastal waters Sunday afternoon into Sunday night. Near
normal temperatures are expected early next week.

Marine: (now through Friday): the pgf across the marine locations
have weakened enough to allow the gulf swells to finally drop down
below SCA levels. However as the surface troffing forms up near the
coastline through fri, do not expect great boating conditions to
return any time soon to the lower rgv waters. Conditions across the
bay and gulf waters may remain close to the scec territory
maintaining fairly choppy bay conditions and elevated gulf swells.

Friday night through Monday night: southeast flow returns Friday
night through Sunday and the long fetch will bring wave heights up
to small craft advisory levels potentially. Marine conditions will
improve briefly Sunday evening as the gradient relaxes ahead of the
approaching cold front. The cold front will move through the lower
texas coastal waters late Sunday with small craft advisory
conditions possible behind the front into Monday.

Bro watches warnings advisories
Tx... Freeze warning until 9 am cst this morning for txz248>254.

Wind chill advisory until 10 am cst this morning for txz254>257.

Gm... None.

This product is also available on the web at:
http: weather.Gov rgv
short term... 60
long term... 63
graphicast upper air... 62


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PTIT2 - 8779770 - Port Isabel, TX 0 mi40 min NNW 12 G 17 37°F 48°F1031.2 hPa
BZST2 3 mi46 min NNW 17 G 22 38°F 50°F1029.8 hPa
PCGT2 - 8779748 - South Padre Island CGS, TX 3 mi40 min NNW 17 G 21 38°F 1031.4 hPa
42044 - PS-1126 TABS J 13 mi148 min E 9.7 G 14 41°F 57°F1030.1 hPa (-1.7)33°F
RLIT2 14 mi40 min WNW 14 G 19 37°F 58°F1031.7 hPa
PMNT2 36 mi40 min 37°F 52°F1032.3 hPa
42045 - PI-745 TABS K 40 mi148 min ENE 14 G 18 54°F 70°F1030 hPa (-1.5)

Wind History for Port Isabel, TX
(wind in knots)    EDIT      (on/off)   Help
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N21
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Brownsville, Brownsville / South Padre Island International Airport, TX16 mi95 minNW 1010.00 miOvercast37°F21°F52%1031.8 hPa

Wind History from SPL (wind in knots)
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Last 24hrSE7S7S10S8S8S9S8W5SW11S14SW13SW8SW6N4E3NE7NE6E4E5E6E4E3E4Calm
1 day agoS8S7S4SW5NW3N3N3N6E4NE4E5E13SE16NW8S4S7S5CalmCalmSE6SE6SE5SE6SE5
2 days agoSE7SE7SE8SE3S5S6S6SW5NW3NW4SW8SW11S20SW16
G21
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G18
S15S18S15S14S10SW9SW8S9S7

Tide / Current Tables for Port Isabel, Texas
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Port Isabel
Click for Map
Thu -- 07:17 AM CST     Sunrise
Thu -- 08:19 AM CST     Moonrise
Thu -- 10:10 AM CST     -0.41 feet Low Tide
Thu -- 06:01 PM CST     Sunset
Thu -- 07:25 PM CST     1.07 feet High Tide
Thu -- 07:36 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
110.90.80.70.50.30-0.2-0.3-0.4-0.4-0.2-00.30.50.80.911.11.1111

Tide / Current Tables for Matamoros, Tamaulipas, Mexico
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Matamoros
Click for Map
Thu -- 07:18 AM CST     Sunrise
Thu -- 08:20 AM CST     Moonrise
Thu -- 09:49 AM CST     -0.47 feet Low Tide
Thu -- 06:03 PM CST     Sunset
Thu -- 06:56 PM CST     1.00 feet High Tide
Thu -- 07:38 PM CST     Moonset
Thu -- 11:53 PM CST     0.84 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.90.80.80.60.40.2-0.1-0.3-0.4-0.5-0.4-0.2-00.30.50.70.91110.90.90.8

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 Brownsville, TX (8,2,3,4)
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Ground Weather Radar Station Brownsville, TX
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weather_mapweather_map weather_map

Gulf Stream Current


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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.