Monday, January18, 2021
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Marine Weather and Tides
Port Isabel, TX

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:16AMSunset 6:04PM Monday January 18, 2021 8:52 PM CST (02:52 UTC) Moonrise 11:08AMMoonset 11:22PM Illumination 32% Phase: Waxing Crescent; Moon at 6 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- 325 Pm Cst Mon Jan 18 2021
.small craft should exercise caution...
Tonight..South winds 15 to 20 knots. Choppy on the bay.
Tuesday..Southeast winds 10 to 15 knots. A moderate chop on the bay. Slight chance of showers.
Tuesday 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. Chance of showers.
Wednesday..Southeast winds 5 to 10 knots. A light chop on the bay. Chance of showers.
Wednesday night..South winds 5 to 10 knots. A light chop on the bay. Chance of showers.
Thursday..South 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 in the morning.
Thursday night..South winds 10 to 15 knots. A moderate chop on the bay.
Friday..South winds 5 to 10 knots. A light chop on the bay.
Friday night..Southeast winds 5 to 10 knots. A light chop on the bay.
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.
Saturday night..Southeast winds 10 to 15 knots. A moderate chop on the bay. Slight chance of showers.
GMZ100 Synopsis For Baffin Bay To Rio Grande Out 60 Nm- 325 Pm Cst Mon Jan 18 2021
Synopsis..Less than favorable marine conditions are anticipated through the forecast period. Winds and seas will continue to increase this afternoon due to a tightening pressure gradient. A small craft advisory has been issued for the gulf waters due to elevated seas. Small craft exercise caution conditions will hold for the laguna madre. Persistent southeasterly winds will hold through Thursday evening, with an extended period of small craft exercise caution conditions likely. Additional small craft advisories may also be needed, at least intermittently, through much of the coming week.


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 182332 AAA AFDBRO

Area Forecast Discussion . UPDATED National Weather Service Brownsville TX 532 PM CST Mon Jan 18 2021

DISCUSSION. Updated for latest aviation discussion below.

AVIATION. Current satellite and observations show VFR conditions at all aerodromes. Mid and low level clouds will continue to be a mainstay through the TAF period. VFR conditions are expected to continue at HRL through the period with MFE and BRO seeing periodic MVFR conditions this evening into the first part of the overnight before returning to VFR near or after midnight. Breezy winds will continue to affect all terminals this evening with gusts to 30 kts. Winds will decrease overnight at HRL and BRO before increasing again Tuesday late morning with gusts once again up to 30 kts.

PREV DISCUSSION. /issued 242 PM CST Mon Jan 18 2021/

SHORT TERM (Now through Tuesday Night): Zonal mid-level flow, surface high pressure over the southeastern CONUS, and developing low pressure in northeastern Mexico will favor southeasterly onshore flow, leading to warming temps and increased moisture through the short term. Low-level cloud cover will keep temperatures relatively mild overnight. The persistent southeasterly flow may also aid in the development of some patchy advection fog, mainly near the coast as dew points continue to increase over relatively cool ocean waters. Current thinking is that wind speeds will remain a bit too strong to preclude widespread fog development, but some very localized fog cannot be totally ruled out. For now, have opted to leave fog out of the forecast package due to relatively low confidence.

A frontal boundary dropping into the Southern Plains on Tuesday will help maintain southeasterly flow and moisture return, and also aid in the development in scattered showers. Guidance continues to hone in on western portions of the CWA for the heaviest rain and highest rain chances so have increased PoPs accordingly. Showers then continue into Tuesday night to cap off the short term.

LONG TERM (Wednesday through Monday): The general mid/upper split flow level pattern remains on track with the development of the upper closed low off the Baja CA coast and building of 500mb ridge over the Gulf. The pattern has slowed down by 12-24 hours with the anticipated low to lift out and weaken as it tracks across Texas Thursday night into Friday. A northern stream system to send surface high pressure south into Texas with weak low pressure and a surface cold front moving across South Texas Wednesday. Still uncertain on how far south and east this front may reach with GFS and EC not as certain as the NAM showing the front approaching the Lower RGV late Wednesday before stalling. In any case, the close proximity of the front or a surface trough will combine with abundant deep moisture keeping good chances for rain for much of the CWA Wednesday and Wednesday night. Uncertainty comes into play for Wednesday's high temperatures with the NAM the coolest dropping highs into the 50s for the western counties. The rest of the guidance maintains 60s for the west and 70s in the east. Will take a blend trending a bit on the cooler side.

The slower ejection of the Baja low may delay the retreat of the front back to the north and model guidance continues to suggest some rain chances lingering Thursday morning before southerly flow returns and warms up the afternoon. Next upstream Pacific trough is also slower to evolve and move east as the Gulf/Caribbean ridge is trending slightly stronger. This mean West Coast trough and Gulf ridge pattern should maintain a robust moist southerly flow and above normal temperatures for South Texas through the remainder of the Long term. Rain chances although not zero, look to be limited Friday through next weekend with next Sunday possibly the best next day for rainfall at this time.

MARINE:(Now through Tuesday Night): High pressure located over the southeastern CONUS and developing low pressure over northeastern Mexico maintain a tight pressure gradient over the coastal waters, and winds continue to increase. As a result, have issued another Small Craft Advisory for the nearshore Gulf Waters from 00z to 09z Tuesday, and extended the offshore advisory through 15z Tuesday. Small Craft Exercise Caution conditions continue over the Laguna Madre due to high winds. Winds will diminish slightly overnight. As mentioned above, there is some potential for patchy advection fog to occur over the Laguna Madre and portions of the nearshore waters as winds relax, and relatively warm and moist air flows over cooler ocean waters. Winds still look relatively strong to preclude any dense fog (one mile or less) concerns, but mariners should remain vigilant. Less than favorable marine conditions will last through the end of the short term due to moderate winds and elevated seas.

(Wednesday through Saturday) . Surface ridge settles over the Eastern Gulf mid to late in the week with low pressure situated over West Texas and NE Mexico. This should maintain a moderate to occasionally strong southeast to south flow. The persistent southerly fetch will also also aid in developing a long period south swell. Periodic Small Craft advisories are expected with strongest gradient later Thursday through next Saturday.

PRELIMINARY POINT TEMPS/POPS. BAYVIEW/PORT ISABEL 66 76 63 75 / 0 20 50 50 BROWNSVILLE 66 78 65 76 / 0 20 50 50 HARLINGEN 64 78 63 75 / 0 20 50 50 MCALLEN 65 78 62 72 / 10 30 70 50 RIO GRANDE CITY 62 80 56 70 / 10 40 70 60 SOUTH PADRE ISLAND 66 74 67 70 / 0 20 50 40

BRO WATCHES/WARNINGS/ADVISORIES. TX . None. GM . Small Craft Advisory until 9 AM CST Tuesday for GMZ170-175.

Small Craft Advisory until 3 AM CST Tuesday for GMZ150-155.



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

68-McGinnis/Aviation


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PTIT2 - 8779770 - Port Isabel, TX 0 mi58 min SSE 13 G 18 68°F 61°F1016.8 hPa
BZST2 3 mi58 min SSE 15 G 18 67°F 62°F1013.8 hPa
PCGT2 - 8779748 - South Padre Island CGS, TX 3 mi58 min SSE 16 G 18 67°F 65°F1014.4 hPa
RLIT2 14 mi58 min SSE 16 G 19 67°F 67°F1013.7 hPa
PMNT2 36 mi58 min 67°F 64°F1014.7 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 mi59 minSSE 1610.00 miFair69°F62°F78%1014.7 hPa
Brownsville, Brownsville / South Padre Island International Airport, TX16 mi59 minSSE 1510.00 miMostly Cloudy70°F62°F76%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
Mon -- 02:11 AM CST     0.67 feet Low Tide
Mon -- 04:37 AM CST     0.69 feet High Tide
Mon -- 07:17 AM CST     Sunrise
Mon -- 11:07 AM CST     Moonrise
Mon -- 01:00 PM CST     0.12 feet Low Tide
Mon -- 06:01 PM CST     Sunset
Mon -- 08:13 PM CST     0.79 feet High Tide
Mon -- 11:22 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.70.70.70.70.70.70.60.50.40.30.20.20.10.20.20.40.50.70.70.80.80.70.6

Tide / Current Tables for Matamoros, Tamaulipas, Mexico
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Matamoros
Click for Map
Mon -- 01:27 AM CST     0.53 feet Low Tide
Mon -- 05:45 AM CST     0.63 feet High Tide
Mon -- 07:17 AM CST     Sunrise
Mon -- 11:08 AM CST     Moonrise
Mon -- 12:41 PM CST     0.08 feet Low Tide
Mon -- 06:03 PM CST     Sunset
Mon -- 08:06 PM CST     0.72 feet High Tide
Mon -- 11:23 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Weather Map
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wmap_A
GEOS Local Image of    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.
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Ground Weather Radar Station



Gulf Stream Current



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