Thursday, July29, 2021
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Marine Weather and Tides
Port Isabel, TX

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:53AMSunset 8:19PM Thursday July 29, 2021 5:43 PM CDT (22:43 UTC) Moonrise 11:16PMMoonset 11:10AM Illumination 70% Phase: Waning Gibbous; Moon at 20 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- 411 Pm Cdt Thu Jul 29 2021
Tonight..East winds 5 to 10 knots shifting south after midnight. Smooth to a light chop on the bay.
Friday..South winds 5 to 10 knots shifting southeast 10 knots in the afternoon. A light chop on the bay. Isolated to scattered showers and Thunderstorms.
Friday night..Southeast winds 10 to 15 knots diminishing to south 5 to 10 knots after midnight. A moderate chop on the bay subsiding to a light chop after midnight.
Saturday..Southeast winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. A light chop on the bay building to a moderate chop in the afternoon. Slight chance of showers and Thunderstorms.
Saturday night..South winds 10 to 15 knots diminishing to 5 to 10 knots after midnight. A moderate chop on the bay becoming a light chop late.
Sunday..South winds 5 to 10 knots becoming southeast 10 to 15 knots in the afternoon. A light chop on the bay building to a moderate chop in the afternoon.
Sunday night..Southeast winds 10 to 15 knots becoming south 5 to 10 knots after midnight. A moderate chop on the bay subsiding to a light chop after midnight.
Monday..South winds 5 to 10 knots becoming southeast 10 to 15 knots in the afternoon. A light chop on the bay building to a moderate chop in the afternoon.
Monday night..Southeast winds 10 to 15 knots becoming south 5 to 10 knots after midnight. A moderate chop on the bay subsiding to a light chop after midnight.
Tuesday..South winds 5 to 10 knots becoming southeast 10 to 15 knots in the afternoon. A light chop on the bay building to a moderate chop in the afternoon.
Tuesday night..Southeast winds 10 to 15 knots. A moderate chop on the bay.
GMZ100 Synopsis For Baffin Bay To Rio Grande Out 60 Nm- 411 Pm Cdt Thu Jul 29 2021
Synopsis..A weak upper level low pressure trough will provide sufficient moisture to maintain scattered to locally numerous mainly late night through early afternoon showers and Thunderstorms across the gulf waters Friday and Saturday. Outside of these times, light winds and slight seas will prevail. For Sunday through Tuesday, broad high pressure across the gulf with weak low pressure across the lee of the sierra madre will maintain light to moderate southeast flow and a slight increase in seas, with just a stray late night or morning shower or Thunderstorm.


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 291920 AFDBRO

Area Forecast Discussion National Weather Service Brownsville TX 220 PM CDT Thu Jul 29 2021

.SHORT TERM (Now through Friday Night): The center of a mid-level ridge will remain parked over the Kansas area in the short term. As well, broad high pressure will reside over the Gulf, but summertime instability will keep the Gulf cauldron bubbling with showers and thunderstorms in the short term. Weak coastal convergence/troughing is forecast to set up over the extreme Northwest Coast of Mexico and into the CWA, and will help keep nearby moisture focused, bolstering convective chances to scattered on the Gulf through Friday. Some of these could reach the immediate coastal zones. In addition, forecast PWAT inland will drift up to around two inches on Friday, suggesting or supporting scattered showers and thunderstorms for eastern areas. The elevated PWAT could support locally heavy rain amounts at times. Though general thunderstorms will continue through the short term, WPC does not currently have the CWA in any excessive rainfall zone.

Otherwise, light winds, mostly clear skies, and elevated dew points overnight will lead to some fog across inland areas, but guidance is not overly bullish for the lower Valley. Nonetheless, HRL and mid- valley points will likely see brief, locally dense fog Friday morning which could impact the morning commute from just before dawn to sunrise and subsequent burn off. Model guidance suggests slightly warmer overnight temperatures Friday night and therefore a little weaker signal for fog. Did not paint it into the grids for Friday night at this point.

Temperatures look like they will mainly in the 90s during the day, close to normal, and well into the 70s at night, slightly above normal. Friday high temperatures will be around the century mark for northwest sections. This will generate heat index values from 103 to 108 degrees.

.LONG TERM (Saturday through Thursday): 500mb ridging setup over the Rockies and High Plains regions will favor overall quiet weather across the CWA. Troughing across the eastern Pacific and also across the eastern United States will keep the ridge fairly stationary with both trough axes remaining far enough away to not have much influence over our area through next week. The passage of a weak inverted trough may lead to some widely scattered showers and thunderstorms on Saturday, but mostly dry conditions can be expected for most. Dew points will remain fairly high as temperatures also increase this weekend, with heat indices routinely topping out between 105-110 degrees for much of the CWA through next week. The usual hot spots in Starr and Zapata counties, as well as Kenedy County at times, may see Heat Advisory conditions occur.

By Tuesday, a stronger midlevel longwave trough will begin to dig in across the central and eastern United States and allow for the 500mb ridge to slowly break down. A cold front will be slowly traversing the interior United States from north to south as the ridge breaks down, eventually stalling across central Texas by Tuesday afternoon or evening. Exactly how far south the front drops before stalling remains a key part of, as well as source of uncertainty for next week’s forecast. While the front is not necessarily expected to plunge through south Texas, the increasing lift and additional moisture flow ahead of it may allow for some increased rain chances during the middle of next week. Details will be refined as the event approaches.

.MARINE (Now through Friday Night): Mainly light southeast to south winds and low seas will prevail in the short term. The main issue for mariners will be showers and thunderstorms in the area. Gulf instability will continue, and weak coastal troughing will develop from the northwest Mexican Coast into the local waters. Scattered showers and tstms will cover the marine zones through Friday, but will diminish Friday night.

Saturday through Tuesday: Aside from some scattered showers and thunderstorms on Saturday, generally favorable marine conditions will occur through early next week. Broad high pressure over the central and eastern Gulf persists through the period. A generally weak pressure gradient also remains in place, maintaining light to moderate southeast winds as well as fairly low wave heights through Tuesday. Winds may barely reach into SCEC criteria late in the period as a cold front approaches the northern Gulf, with little change in wave heights expected.

PRELIMINARY POINT TEMPS/POPS. BAYVIEW/PORT ISABEL 78 91 78 92 / 10 30 0 10 BROWNSVILLE 78 93 79 94 / 10 30 10 20 HARLINGEN 77 93 78 95 / 0 30 0 20 MCALLEN 77 96 78 97 / 0 30 0 20 RIO GRANDE CITY 76 101 78 102 / 0 20 0 10 SOUTH PADRE ISLAND 81 87 81 87 / 10 30 0 10

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

This product is also available on the web at: https://weather.gov/rgv

Short Term/Aviation . 54-BHM Long Term . 55-Adams IDSS . 68-McGinnis


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PTIT2 - 8779770 - Port Isabel, TX 0 mi55 min NE 13 G 18 85°F 85°F1016.2 hPa
BZST2 3 mi55 min NE 14 G 17 83°F 84°F1014.2 hPa
PCGT2 - 8779748 - South Padre Island CGS, TX 3 mi55 min ENE 8 G 15 85°F 85°F1014.8 hPa
RLIT2 14 mi55 min NE 17 G 18 87°F 93°F1014 hPa
PMNT2 36 mi55 min 86°F 90°F1015.6 hPa

Wind History for Port Isabel, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Isabel, Port Isabel-Cameron County Airport, TX9 mi50 minENE 13 G 2210.00 miFair88°F75°F66%1014.9 hPa
Brownsville, Brownsville / South Padre Island International Airport, TX16 mi50 minNE 1310.00 miMostly Cloudy89°F74°F61%1014.6 hPa

Link to 5 minute data for KSPL

Wind History from SPL (wind in knots)
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Last 24hrSE7S7S10S8S8S9S8W5SW11S14SW13SW8SW6N4E3NE7NE6E4E5E6E4E3E4Calm
1 day agoS8S7S4SW5NW3N3N3N6E4NE4E5E13SE16NW8S4S7S5CalmCalmSE6SE6SE5SE6SE5
2 days agoSE7SE7SE8SE3S5S6S6SW5NW3NW4SW8SW11S20SW16
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Tide / Current Tables for Port Isabel, Texas
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Port Isabel
Click for Map
Thu -- 01:47 AM CDT     0.25 feet Low Tide
Thu -- 06:53 AM CDT     Sunrise
Thu -- 08:44 AM CDT     0.91 feet High Tide
Thu -- 12:09 PM CDT     Moonset
Thu -- 03:00 PM CDT     0.53 feet Low Tide
Thu -- 08:16 PM CDT     Sunset
Thu -- 08:46 PM CDT     0.73 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.30.30.30.40.50.70.80.90.90.90.80.70.60.60.50.50.60.60.70.70.70.70.7

Tide / Current Tables for Matamoros, Tamaulipas, Mexico
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Matamoros
Click for Map
Thu -- 01:30 AM CDT     0.61 feet Low Tide
Thu -- 06:54 AM CDT     Sunrise
Thu -- 08:33 AM CDT     1.23 feet High Tide
Thu -- 12:10 PM CDT     Moonset
Thu -- 02:31 PM CDT     0.79 feet Low Tide
Thu -- 08:17 PM CDT     Sunset
Thu -- 08:54 PM CDT     1.14 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.60.60.70.80.91.11.21.21.21.21.10.90.90.80.80.80.911.11.11.11.11.1

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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