Saturday, July11, 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 6:45AMSunset 8:27PM Saturday July 11, 2020 9:07 PM CDT (02:07 UTC) Moonrise 12:00AMMoonset 11:35AM Illumination 59% Phase: Waning Gibbous; Moon at 21 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:202007120930;;696103 Fzus54 Kbro 112118 Cwfbro Coastal Waters Forecast National Weather Service Brownsville Tx 418 Pm Cdt Sat Jul 11 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. Gmz130-132-135-120930- 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- 418 Pm Cdt Sat Jul 11 2020
Tonight..South winds 10 to 15 knots. A moderate chop on the bay.
Sunday..South winds 5 to 10 knots becoming southeast 15 to 20 knots in the afternoon. A light chop on the bay building to choppy in the afternoon.
Sunday night..South winds 15 to 20 knots. Choppy on the bay.
Monday..South winds 10 to 15 knots becoming southeast 15 to 20 knots in the afternoon. A moderate chop on the bay building to choppy in the afternoon.
Monday night..Southeast winds 15 to 20 knots becoming south 10 to 15 knots after midnight. Choppy on the bay subsiding to a moderate chop after midnight.
Tuesday..South winds 10 to 15 knots becoming southeast 15 to 20 knots in the afternoon. A moderate chop on the bay building to choppy in the afternoon.
Tuesday night..Southeast winds 15 to 20 knots becoming south 10 to 15 knots after midnight. Choppy on the bay subsiding to a moderate chop after midnight.
Wednesday..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.
Wednesday 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.
Thursday..Southeast winds 10 to 15 knots. A moderate chop on the bay.
Thursday night..Southeast winds 10 to 15 knots. A moderate chop on the bay.
GMZ100 Synopsis For Baffin Bay To Rio Grande Out 60 Nm- 418 Pm Cdt Sat Jul 11 2020
Synopsis..High pressure will continue to be the dominant feature over the western gulf of mexico during the next several days, producing generally moderate winds and seas. However, winds over the laguna madre may be strong enough to require small craft exercise caution most afternoons.


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 120010 AAA AFDBRO

Area Forecast Discussion . UPDATED National Weather Service Brownsville TX 710 PM CDT Sat Jul 11 2020

DISCUSSION. Updated for latest aviation discussion below.

AVIATION. Satellite and surface observations show clear skies prevailing across the Rio Grande Valley and Deep South Texas this evening. VFR conditions are expected to continue over the next 24 hours, with the exception of a possible MVFR deck forming at KHRL early Sunday morning which will then quickly mix out around sunrise. Moderate southeasterly winds will briefly decrease overnight and then pick up again mid morning on Sunday.

PREV DISCUSSION. /issued 244 PM CDT Sat Jul 11 2020/

..Elevated heat index values likely across deep South Texas Sunday .

SHORT TERM (Tonight through Sunday night): 500mb subtropical ridge across New Mexico and west Texas will move little through the short term. This will continue to provide subsidence across south Texas tonight through Sun night. Low to mid level moisture will continue to be limited across the area so no rain chances are expected. The main impact continues to be the heat and humidity. First . temperatures will continue to be hot across the CWA Sunday with highs Sun afternoon near record high temperatures. The record high for the McAllen area Sunday is 105 degrees set in 1988 and 103 degrees for the Brownsville area Second. with dewpoints in the lower 60s west to upper 70s along the coast Sun afternoon . heat index values will reach 106 to 110 degrees across the CWA with heat index values of 110 to 115 possible across upper portions of the Rio Grande Valle and across the coastal counties of deep South Texas. Heat advisories will likely be needed for most of the CWA Sun afternoon.

LONG TERM (Monday through Saturday): Strong mid-level ridging will remained centered over west Texas/Southern Plains through the entire long-term period, keeping the RGV and Deep South Texas hot, humid, and mostly dry. Long-range forecast models suggest some weakening is forecast on the southern edge of the ridge (over South Texas) as the core of the ridge becomes centered over the Plains by the end of the upcoming week. If this verifies, it may increase PoPs slightly, in the form of streamer showers and seabreeze activity, into next weekend . although the best chances look to remain offshore at this time. At the surface, strong high pressure across the northern Caribbean will slide westward through the week. With a thermal trough remaining in place across inland Mexico, moderate to gusty southeast/south-southeast winds will persist, with breeziest conditions occurring during the afternoon hours each day.

Temperatures . The hottest ambient temperatures continue to be progged for Monday and Tuesday afternoons in the long-term period, with temperatures decreasing a few degrees the second half of the week. However, dewpoint temperatures are expected increase slightly each day through the upcoming week, keeping heat indices well above 100 degrees each afternoon. Heat Advisory criteria of 111 degrees plus will be possible through at least Wednesday of next week. Low temperatures will continue to be very warm and muggy, generally in the mid-upper 70s and lower 80s each night.

MARINE (Tonight through Sunday night): Seas were near 2 feet with southeast winds near 10 knots at buoy020 at 1:30 pm. Light to moderate south to southeast winds will prevail across the coastal waters tonight with surface high pressure across the western Gulf of Mexico. The pressure gradient will remain weak across the lower Texas coast Sunday but will increase Sun night. Light to moderate south to southeast winds will prevail across the western Gulf Sunday but will increase to SCEC conditions Sun night.

Monday through Friday: Strong surface high pressure will build westward from the Caribbean through the upcoming week, drifting over the northwestern Gulf of Mexico by the end of the week. A relatively tight pressure gradient will keep south/south-southeast winds breezy and gusty through Thursday, especially across the bay and near-shore Gulf waters. Operators of small craft will likely need to exercise caution each afternoon through this period, with possible SCAs needed at times. Seas will remain around 2 to 4 feet on the Gulf waters this upcoming week. The overall marine conditions should improve by Friday and continue into the weekend as high pressure nearby eases the pressure gradient. The chance of streamer showers or isolated thunderstorms may return offshore on Friday, likely very limited in coverage.

PRELIMINARY POINT TEMPS/POPS. BAYVIEW/PORT ISABEL 95 78 97 78 / 0 0 0 0 BROWNSVILLE 97 79 98 79 / 0 0 0 0 HARLINGEN 100 78 102 77 / 0 0 0 0 MCALLEN 102 79 104 78 / 0 0 0 0 RIO GRANDE CITY 108 78 109 77 / 0 0 0 0 SOUTH PADRE ISLAND 87 80 87 81 / 0 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES. TX . Heat Advisory until 7 PM CDT this evening for TXZ248>255-353.

GM . None.

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

Aviation . 69-Farris


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PMNT2 2 mi68 min 85°F 91°F
RSJT2 - 8777812 - Rincon del San Jose; Potrero Lopeno SW, TX 18 mi68 min SE 20 G 22 85°F 91°F
RLIT2 20 mi68 min ESE 16 G 20 85°F 92°F
BZST2 35 mi68 min SE 11 G 12 82°F 80°F
PCGT2 - 8779748 - South Padre Island CGS, TX 35 mi68 min SE 9.9 G 12 83°F
PTIT2 - 8779770 - Port Isabel, TX 35 mi68 min SE 15 G 18 84°F 85°F
42020 - Corpus Christi, TX 50NM Southeast of Corpus Christi, TX 48 mi38 min SSE 14 G 16 85°F 1014.7 hPa78°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 mi76 minSE 1610.00 miFair88°F75°F66%1014.2 hPa

Link to 5 minute data for KHRL

Wind History from HRL (wind in knots)
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Last 24hrSE11SE8SE7S9S9S8SE6E5SE7SE8SE9S10S12S10S11
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1 day agoSE14SE12SE10S10S10SE8SE8SE7SE6S9SE10S16SE16S15
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2 days agoSE13SE12SE10S12S9S12SE11SE8SE11SE10SE13S17
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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 (22,6,7,8)
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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 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.