Saturday, April29, 2017 L-36.com


Marine Weather and Tides
South Padre Island, 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 6:52AMSunset 8:02PM Saturday April 29, 2017 6:29 AM CDT (11:29 UTC) Moonrise 8:52AMMoonset 10:41PM Illumination 12% Phase: Waxing Crescent; Moon at 3 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- 333 Am Cdt Sat Apr 29 2017
.small craft advisory for winds in effect through this evening...
Today..Southeast winds 18 to 23 knots. Rough on the bay.
Tonight..South winds 18 to 23 knots shifting southwest 16 to 20 knots after midnight, then shifting northwest 15 to 19 knots early in the morning. Rough on the bay subsiding to choppy after midnight. Isolated showers.
Sunday..North winds 20 to 25 knots diminishing to 11 to 15 knots. Rough on the bay subsiding to a moderate chop.
Sunday night..Northeast winds 9 to 14 knots becoming east 7 to 10 knots early in the morning. A moderate chop on the bay subsiding to a light chop early in the morning.
Monday..Southeast winds 7 to 12 knots increasing to 11 to 14 knots late in the afternoon. A light chop on the bay increasing to a moderate chop late in the afternoon.
Monday night..Southeast winds 11 to 15 knots. A moderate chop on the bay.
Tuesday..Southeast winds 11 to 14 knots. A moderate chop on the bay.
Tuesday night..Southeast winds 10 to 14 knots. A moderate chop on the bay. Slight chance of showers.
Wednesday..Southeast winds 10 to 14 knots. A moderate chop on the bay.
Wednesday night..Southeast winds 10 to 15 knots. A moderate chop on the bay. Chance of showers and Thunderstorms.
GMZ100 Synopsis For Baffin Bay To Rio Grande Out 60 Nm- 333 Am Cdt Sat Apr 29 2017
Synopsis..Strong southeast to south winds will prevail across the lower texas coastal waters into Saturday evening with steadily building seas as the pressure gradient remains strong. Small craft advisories are in effect. A cold front will move through the lower texas coastal waters after midnight tonight...quickly shifting winds to the north with hazardous winds and seas remaining in place through much of Sunday. Conditions will improve by Sunday night as high pressure builds in
.with more moderate winds and seas on Monday continuing through mid week. Another cold front arrives Wednesday night with a chance for showers and Thunderstorms.

7 Day Forecast for Marine Location Near South Padre Island, TX
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location: 26.11, -97.16     debug


Area Discussion for - Brownsville, TX
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Fxus64 kbro 290935
afdbro
area forecast discussion
national weather service brownsville tx
435 am cdt Sat apr 29 2017
.Short term (now through Sunday): heat and wind continue to be
the main weather stories in the short-term. An upper-level low,
currently over the four corners, per water-vapor imagery and rap
analysis, will swing across nm and into the panhandle region today
before lifting slowly into ks tomorrow. This will maintain a
tight pressure gradient in the surface reflection, as well as
allow a pre- frontal trough/dryline to progress into the CWA today
(though its ultimate eastward progression a little tough to pin
down). Pretty quick onset of breezy conditions on tap again for
the eastern counties this morning, though guidance has been
consistent in keeping speeds down a touch from yesterday, so will
hold off on any wind advisories. Winds actually ease off some by
early afternoon, except right along the coast, as the trough
approaches.

Low-level westerly wind component will again allow for downslope
heating to occur. H85 temps progged to run 25-27c this afternoon, a
degree or so (celsius) higher than observed on 00z bro raob, so
temps should top out a couple deg f above those recorded yesterday.

This was well-reflected in the evening shift's temp update so will
run with those. Forecast highs for bro/hrl/mfe are 97/100/104f,
respectively, vs. Daily records of 99/101/102. Heat indices of 105-
109f are likely across inland cameron/willacy and kenedy counties,
where dewpoints remain in the upper 60s-low 70s. A little trickier
for the mcallen metro, as dryline will be flirting with that area.

Not expecting head advisory criteria to be met, but an sps will be
forthcoming due to the early season (still april!) oppressive
heat/humidity combo.

Tonight, a cold front moves into the area, reaching the northwestern
counties around 03-04z (give or take, with GFS a little faster than
the nam). It moves through the area fairly quickly, probably
through bro by sunrise. A little moisture pools ahead of/along the
front, and there is some decent lifting, so will maintain isolated
pop's over eastern counties 06-12z with more scattered coverage
offshore. Fairly stiff winds of 15-20 knots fill in behind the
front, with some gusts of 25-30kt in a narrow ribbon right along it.

Drier air quickly pours in Sunday morning, ending any precip
threat. Dewpoints plunge into the 30s and 40s f by early afternoon.

With moderate north winds, some fire weather issues are possible;
see below. High temps will actually be knocked down to the low-mid
80s, nearly 5 deg f below normal, so it will feel pleasant outside.

Elevated rip current risk will exist at area beaches, however.

.Long term (Sunday night through Friday): the forecast period begins
with a 500mb low/trough over the central plains and surface high
pressure building across the northwest gulf of mexico. Pleasant
conditions will prevail Sunday night with low temperatures in the
upper 50s to lower 60s under clear skies. Weak mid level zonal flow
will develop over the region on Monday providing subsidence across
deep south texas through early next week. A 500mb shortwave trough
is expected to develop over northwest united states Tuesday and move
towards the central plains on Wednesday. Low to mid level moisture
will begin to increase across the region Tuesday into Wednesday
courtesy of the southeast flow. A slight chance of showers and
thunderstorms will be possible on Wednesday. Slightly better rain
chances develop Wednesday night into Thursday as a cold front moves
into deep south texas and the rio grande valley. Drier and slightly
cooler air will filter into the area in the wake of the front on
Thursday. Temperatures will generally remain above normal Monday
through Wednesday. Near normal temperatures and rain free conditions
arrive through the rest of the forecast period in the wake of the
front.

.Marine (now through Sunday): an extended period of unfavorable
marine conditions continues through the short-term. Current
conditions at buoy 020 (as of 2:50am cdt) show SE winds at 19g23kt
with seas of 6-7 ft. An enhanced pressure gradient will cause these
winds to be maintained into this evening, with seas building as
well. Winds on the laguna madre remained elevated much of the
night, so have issued a small craft advisory for winds there through
10pm for now. Winds quickly flip to the north and increase with a
cold frontal passage after midnight tonight, which will bring the
laguna back to SCA conditions even if there is a brief lull late
this evening. A few gale-force gusts are possible in the gulf with
the front, but window appears to be short (2-3 hours) so after
coordinating with neighbor office, will hold off on a gale watch.

Sca for the gulf waters has been extended out until 1pm Sunday, due
to the aforementioned winds and seas building as high as 10-12 ft.

Far offshore. Winds subside Sunday afternoon, but seas likely to
remain elevated.

Sunday night through Wednesday night... Adverse marine conditions
may continue through the first half of Sunday night due to some
lingering elevated seas. Otherwise, marine conditions will improve
late Sunday night into Monday as surface high pressure builds
across the northwest gulf. Light east winds Monday will increase
and become southeast Monday night high pressure moves east and low
pressure develops across west texas. Light to moderate southeast
winds will prevail across the lower texas coastal waters Tuesday
and Wednesday. A cold front will approach the lower texas coast
late Wednesday night.

.Fire weather: rh values fall to 15-20% across starr/jim
hogg/zapata counties today, but afternoon wind speeds will drop to 5-
10mph, mitigating fire weather concerns. Fuel moisture also still
currently rated "normal" across much of this area, though continued
drying will occur over the next two days. For Sunday, elevated fire
weather conditions are likely (as outlined by spc), as rh's fall
into the 15-20% range (mainly west of hwy. 281). Latest guidance
has backed off slightly on 20-ft. Winds from late morning onward.

Due to uncertainty, will opt not to issue a fire weather watch at
this juncture but will let day shift take one more look.

Preliminary point temps/pops
Bayview/port isabel 93 69 79 65 / 0 20 10 0
brownsville 98 69 82 64 / 0 20 10 0
harlingen 100 67 83 61 / 0 20 0 0
mcallen 104 67 85 61 / 10 10 0 0
rio grande city 106 67 85 60 / 0 10 0 0
south padre island 82 72 78 69 / 0 20 10 0

Bro watches/warnings/advisories
Tx... None.

Gm... Small craft advisory for winds until 10 pm cdt this evening for
gmz130-132-135.

Small craft advisory until 1 pm cdt Sunday for gmz150-155-170-
175.

This product is also available on the web at:
http://weather.Gov/rgv
short term... 53
long term... 63
graphicast/upper air... 56


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BZST2 3 mi48 min SSE 19 G 22 79°F 79°F1000.2 hPa
PCGT2 - 8779748 - South Padre Island CGS, TX 3 mi42 min SSE 17 G 22 79°F 1001.6 hPa
PTIT2 - 8779770 - Port Isabel, TX 4 mi48 min SSE 15 G 19 79°F 80°F1001.1 hPa
42044 - PS-1126 TABS J 8 mi90 min SSE 18 G 21 77°F 77°F1001.5 hPa (-1.4)75°F
RLIT2 12 mi42 min SE 20 G 26 77°F1001 hPa
PMNT2 34 mi42 min 79°F 81°F1000.9 hPa
42045 - PI-745 TABS K 36 mi90 min 18 G 21 77°F 78°F1001.5 hPa (-1.6)77°F

Wind History for South Padre Island C.G Station, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Isabel, Port Isabel-Cameron County Airport, TX10 mi37 minSSE 18 G 244.00 miFog/Mist and Breezy79°F75°F90%1000.6 hPa
Brownsville, Brownsville / South Padre Island International Airport, TX20 mi37 minSE 16 G 2310.00 miOvercast80°F75°F87%1000.9 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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S15S18S15S14S10SW9SW8S9S7

Tide / Current Tables for Queen Isabella Causeway (east end), Texas
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Queen Isabella Causeway (east end)
Click for Map
Sat -- 06:52 AM CDT     Sunrise
Sat -- 08:41 AM CDT     1.48 feet High Tide
Sat -- 09:52 AM CDT     Moonrise
Sat -- 07:59 PM CDT     Sunset
Sat -- 11:41 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.4-0.3-0.10.20.60.91.21.41.51.51.41.41.31.21.11.110.90.80.60.30.1-0.2-0.4

Tide / Current Tables for Matamoros, Tamaulipas, Mexico
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Matamoros
Click for Map
Sat -- 06:54 AM CDT     Sunrise
Sat -- 08:44 AM CDT     1.48 feet High Tide
Sat -- 09:54 AM CDT     Moonrise
Sat -- 08:00 PM CDT     Sunset
Sat -- 11:42 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.5-0.4-0.20.20.50.91.11.41.51.51.41.31.31.21.11.11.110.90.70.40.1-0.2-0.4

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 (7,2,3,4)
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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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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.