Tuesday, March31, 2020
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Marine Weather and Tides
Port Mansfield, TX

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:20AMSunset 7:48PM Tuesday March 31, 2020 1:34 PM CDT (18:34 UTC) Moonrise 11:15AMMoonset 12:29AM Illumination 52% Phase: First Quarter Moon; Moon at 8 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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GMZ132 Expires:202004010230;;356808 Fzus54 Kbro 311423 Cwfbro Coastal Waters Forecast National Weather Service Brownsville Tx 923 Am Cdt Tue Mar 31 2020 Lower Texas Coastal Waters From Baffin Bay To The Mouth Of The Rio Grande Out To 60 Nm. Seas Are Provided As A Range Of The Average Height Of The Highest 1/3 Of The Waves, Along With The Occasional Height Of The Average Highest 10 Percent Of The Waves. Gmz130-132-135-010230- 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- 923 Am Cdt Tue Mar 31 2020
Rest of today..North winds 10 to 15 knots. A moderate chop on the bay.
Tonight..Northeast winds 10 to 15 knots. A moderate chop on the bay.
Wednesday..East winds 10 to 15 knots. A moderate chop on the bay.
Wednesday night..Southeast winds 10 to 15 knots. A moderate chop on the bay.
Thursday..Southeast winds 10 to 15 knots increasing to 15 to 20 knots in the afternoon. A moderate chop on the bay building to choppy in the afternoon. Slight chance of showers.
Thursday night..Southeast winds 15 to 20 knots diminishing to 10 to 15 knots after midnight. Choppy on the bay subsiding to a moderate chop after midnight.
Friday..Southeast winds 10 to 15 knots. A moderate chop on the bay. Slight chance of showers and Thunderstorms.
Friday night..Southeast winds 10 to 15 knots diminishing to 5 to 10 knots after midnight. A moderate chop on the bay subsiding to a light chop after midnight. Chance of showers and slight chance of Thunderstorms.
Saturday..East winds 10 to 15 knots. A moderate chop on the bay. Chance of showers and slight chance of Thunderstorms.
Saturday night..East winds 10 to 15 knots diminishing to 5 to 10 knots after midnight. A moderate chop on the bay subsiding to a light chop after midnight. Slight chance of showers and Thunderstorms.
GMZ100 Synopsis For Baffin Bay To Rio Grande Out 60 Nm- 923 Am Cdt Tue Mar 31 2020
Synopsis..A weak cold front is currently progressing through deep south texas, with an initial weak wind shift out of the northwest ahead of the front. Moderate northwest winds will shift to the north this afternoon with moderate to strong north winds developing across the offshore waters behind the front. Surface high pressure will build into the northwest gulf of mexico in the wake of the front today into tonight. Light to moderate northeast winds will prevail across the lower texas coast tonight. Winds will diminish and veer to the east Wednesday as the surface ridge across east texas moves eastward Wednesday afternoon. Light to moderate southeast winds will then prevail across the coastal waters through the rest of the week before backing to the east Saturday as a weak cold front approaches the coastal waters.


7 Day Forecast for Marine Location Near Port Mansfield, TX
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location: 26.54, -97.4     debug


Area Discussion for - Brownsville, TX
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FXUS64 KBRO 311734 AAB AFDBRO

Area Forecast Discussion . UPDATED National Weather Service Brownsville TX 1234 PM CDT Tue Mar 31 2020

DISCUSSION. Updated for latest aviation discussion below.

AVIATION. Surface observations show that the weak cold front has made it through most of the Rio Grande Valley, leaving gusty northerly winds in its wake. Visible satellite imagery shows mostly clear skies with a few high clouds passing over the area. VFR conditions are expected to prevail through 18Z tomorrow as high pressure builds in behind the front. Winds will remain gusty until late tonight, and then become more easterly throughout the day on Wednesday as the surface ridge slides eastward.

PREV DISCUSSION. /issued 632 AM CDT Tue Mar 31 2020/

DISCUSSION . Updated for latest aviation discussion below.

AVIATION . Satellite images and surface observations indicate a mix of low to high level clouds across the CWA early this morning. Ceilings were near 1100ft at KBRO to near 8000ft at KTXW. Visibilities were near 5SM with fog at KHBV. Expect VFR to MVFR conditions across the Rio Grande Valley this morning before a weak cold front moves through the area later this morning. Expect VFR conditions to prevail across the RGV this afternoon into this evening as surface high pressure builds into deep south Texas in the wake of the front.

PREV DISCUSSION . /issued 312 AM CDT Tue Mar 31 2020/ SHORT TERM (Today through Wednesday): A weak cold front will move through the Rio Grande Valley later this morning. May see some patchy fog develop across the southern and eastern portions of the CWA early this morning before the front pushes through the area. The main impact from the front will be drier air moving into deep south Texas today and with clearing skies and low relative humidity this afternoon . temperatures will reach the lower to mid 90s across most of the CWA as a result. Temperatures will be slightly cooler tonight with the drier air across the region. Highs Wednesday will actually be cooler than today as an onshore flow returns Wed morning and low to mid level moisture begins to increase across northeast Mexico and deep south Texas Wednesday.

LONG TERM (Wednesday Night through Monday): A warm and more humid night will be expected Wednesday night as dew points will be on the rise with persistent southeasterly winds as surface high pressure slides to the east. Afternoon high temperatures in the 90s will return across the western half of the CWA on Thursday as moderate southeasterly winds prevail. A couple of isolated rain showers, primarily near the coast, couldn't be ruled out on Thursday with the low-level moisture return. Thursday night into Friday morning will trend very humid and warm with overnight lows in the low to mid 70s.

Rain chances will increase through the latter half of the day on Friday into Saturday as a cold front approaches from the north, which interacts with the pooling moisture across the region. The best rain chances will occur from Friday night through Saturday with the arrival of the front across Deep South Texas. With a primarily zonal flow aloft with the parent shortwave energy pulling northward, the front will likely stall across or just south of the Rio Grande Valley. In addition to showers, enough sufficient instability is in place for at least a slight chance for thunderstorms. A strengthening mid-level ridge across the western Gulf of Mexico on Sunday does lead to a bit of some drier aloft but the frontal boundary remains close enough for lingering chances for showers, perhaps a thunderstorm. The mid- level ridge slides slightly to the east from Sunday night into Monday, which allows for a more southwesterly flow to establish aloft. This could promote the approach of possible convection coming off the higher terrain in Mexico from Sunday night into Monday, with the best rain chances focusing to the west.

Overall, mid-range models are in decent agreement through the long term forecast period. Similar to the previous forecast package, the 7-Day QPF values look to generally range between 0.25 and 0.75 inches, with the highest amounts favoring over the western and northern portions of the CWA.

MARINE (Today through Wednesday): Seas were near 3 feet with south winds near 8 knots at buoy020 early this morning. Light south winds will shift to the northwest and increase later this morning as a weak cold front moves through the coastal waters. Moderate northwest will shift to the north this afternoon with moderate to strong north winds developing across the far offshore waters. Will word SCEC for the far offshore waters as a result. Surface high pressure will build into the northwest Gulf of Mexico in the wake of the front today into tonight. Light to moderate northeast winds will prevail across the lower Texas coast tonight. Winds will diminish and veer to the east Wednesday as the surface ridge across east Texas moves eastward Wed afternoon.:

Wednesday through Saturday Night: Surface high pressure over the Gulf of Mexico and the northern Gulf coast will lead to persistent moderate east to southeasterly winds and mainly moderate seas through early Saturday. A weak front allows winds to turn out of the east-northeast from Saturday into Saturday night. Occasionally, mariners may need to exercise caution, otherwise no strong indications of sustained SCA conditions are noted. Showers and thunderstorm chances will increase from Friday into Saturday with the approach/arrival of the weak cold front.

FIRE WEATHER (Today): A weak cold front will move through the Rio Grande Valley this morning and drier air will filter into deep south Texas this afternoon. With temperatures reaching the lower to mid 90s across most of the CWA today . relative humidity values will fall below 20 percent across most of deep south Texas except across the coastal sections However. 20 foot winds will remain below 15 knots across the area this afternoon except along the lower Texas coast where RH values will be higher. According to the Texas A&M Forest Service (TFS) . fuels are not cured across the area but are transitioning green. The latest TFS forecast fire danger map indicates moderate to high fire danger across eastern portions of deep south Texas today so will issue a fire danger statement for all of the CWA for this afternoon except for the coastal sections of the coastal counties.

BRO WATCHES/WARNINGS/ADVISORIES. TX . None. GM . None.

This product is also available on the web at: HTTP://WEATHER.GOV/RGV

Aviation Update . 69


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PMNT2 2 mi47 min 84°F 80°F1014.7 hPa
RSJT2 - 8777812 - Rincon del San Jose; Potrero Lopeno SW, TX 18 mi47 min NNE 19 G 24 84°F 78°F1014.5 hPa
RLIT2 20 mi47 min N 15 G 19 82°F 82°F1013.5 hPa
BZST2 35 mi53 min N 11 G 11 75°F 72°F1013.3 hPa
PCGT2 - 8779748 - South Padre Island CGS, TX 35 mi47 min N 8 G 15 78°F 1014.1 hPa
PTIT2 - 8779770 - Port Isabel, TX 35 mi53 min N 9.9 G 13 79°F 78°F1014.8 hPa
42020 - Corpus Christi, TX 50NM Southeast of Corpus Christi, TX 48 mi35 min N 21 G 25 75°F 76°F1014.6 hPa (+0.5)65°F

Wind History for Rincon Del San Jose, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Harlingen, Rio Grande Valley International Airport, TX26 mi43 minNE 13 G 2210.00 miPartly Cloudy94°F37°F14%1014.1 hPa

Link to 5 minute data for KHRL

Wind History from HRL (wind in knots)
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S12SE9SE6SE9SE6SE4SE6SE5CalmNE3N8N5N4N7CalmN8N11NE13NE13
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1 day agoNE13E16
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E16E13E10E8E5E5E3CalmCalmSE3SE3SE5SE7SE4W5SW3S6SE11SE18
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S8W4CalmE12E10NE9NE8NE11N15NE10N7NE6NE8NE9N10N8N8N9N8N8NE8NE12NE10

Tide / Current Tables for Queen Isabella Causeway (east end), Texas
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Queen Isabella Causeway (west end), Texas
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map
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wmap_A
GEOS Local Image of SouthCentralPlains    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Brownsville, TX (14,3,4,5)
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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 numerous 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.