Wednesday, April21, 2021
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Marine Weather and Tides
Laguna Vista, TX

Version 3.4
NOTICE
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 6:59AMSunset 7:58PM Wednesday April 21, 2021 10:37 PM CDT (03:37 UTC) Moonrise 1:26PMMoonset 2:25AM Illumination 77% Phase: Waxing Gibbous; Moon at 10 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- 951 Pm Cdt Wed Apr 21 2021
Rest of tonight..East winds 10 to 15 knots. A moderate chop on the bay.
Thursday..Southeast winds 10 to 15 knots. A moderate chop on the bay. Slight chance of showers.
Thursday night..Southeast winds 10 to 15 knots. A moderate chop on the bay. Slight chance of showers in the evening, then chance of showers and Thunderstorms after midnight.
Friday..Southeast winds 15 to 20 knots. Choppy on the bay. Slight chance of showers and Thunderstorms.
Friday night..South winds 15 to 20 knots diminishing to 10 to 15 knots after midnight. Choppy on the bay subsiding to a moderate chop after midnight. Slight chance of showers and Thunderstorms after midnight.
Saturday..North winds around 5 knots becoming northeast in the afternoon. Smooth on the bay building to a light chop in the afternoon.
Saturday night..Northeast winds 5 to 10 knots. A light chop on the bay.
Sunday..East 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.
Sunday 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.
Monday..Southeast winds 10 to 15 knots. A moderate chop on the bay.
Monday night..Southeast winds 10 to 15 knots. A moderate chop on the bay.
GMZ100 Synopsis For Baffin Bay To Rio Grande Out 60 Nm- 951 Pm Cdt Wed Apr 21 2021
Synopsis..Conditions will slowly improve overnight. As the old front returns north on Thursday, expect southeast winds to return. The pressure gradient will tighten late Thursday into Friday, with increasing southeast winds and building seas, before another weak cold front Saturday brings light to moderate northeast winds that will quickly become east on Sunday and southeast on Monday.


7 Day Forecast for Marine Location Near Laguna Vista, TX
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location: 26.14, -97.28     debug


Area Discussion for - Brownsville, TX
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FXUS64 KBRO 212246 AAA AFDBRO

Area Forecast Discussion . UPDATED National Weather Service Brownsville TX 546 PM CDT Wed Apr 21 2021

DISCUSSION. Updated for latest aviation discussion below.

AVIATION. MVFR ceilings now at BRO/HRL but scattered out at MFE. Moderate northeast winds. Light east winds tonight and small dew point depression will support MVFR ceilings. Old front moving north as a warm front Thursday will hang over the CWA, dropping OVC ceilings to IFR Thursday morning with light fog. Plains high pressure shifting east will bring moderate southeast winds to the area Thursday afternoon, improving visibility and ceilings some. May not rise above MVFR ceilings on Thursday, however. Marine and coastal showers will increase as part of the return flow. May see a few sprinkles at BRO on Thursday.

PREV DISCUSSION. /issued 257 PM CDT Wed Apr 21 2021/

SHORT TERM (Tonight through Thursday Night):The cold front that passed through earlier this morning brought in stronger northeasterly winds and CAA than previously expected, so had to nudge up winds and drop today's highs down a few degrees for today. Surface winds will continue to veer to become more easterly this afternoon and southeasterly on Thursday as the high pressure settling in behind the front today moves off toward the east. Overnight, this onshore flow will help to increase surface moisture and moderate lows to near normal temperatures.

Today's cold front will reverse northward as a warm front tomorrow, continuing to advect warmer, moister air across Deep South Texas throughout the day. A weak area of PVA and surface trough will move in from the west on Thursday morning, possibly allowing for some some showers to stream across the area on and off throughout the day, so have gone with some slight chances. Instability will be low, so thunderstorms are not expected at this time. Even with the WAA over the region, temperatures are still expected to stay a few degrees below normal tomorrow with the cloud cover and possible showers . highs will reach the lower 80s across the RGV and mid to upper 70s elsewhere in Deep South Texas.

Overnight Thursday, a shortwave trough will approach the region from the west. Ahead of the shortwave, the pressure gradient will increase as low pressure forms over the Texas Panhandle, and low to mid level moisture will continue to stream in across the area. This pattern will maintain moderate to breezy south-southeasterly winds and allow the slight PoPs to persist overnight and present a slight chance for some thunderstorms to develop with increasing instability . although most of the action will remain north of Deep South Texas heading into Friday.

LONG TERM (Friday through Wednesday): 12Z model suite continue in good consistency and timing with the 500mb flow maintaining a fairly good confidence through the long- term forecast. Main challenges remain with the approach and passage of a low pressure trough Friday/Saturday and another trough next Tuesday/Wednesday. Deep South Texas especially the RGV still look to be on the southern end of greatest moisture and instability of both troughs limiting the chance of convection and rain chances.

Pressure gradient strengthens Friday with the approach of the first mid-level trough . models suggest 25-35 kts 925-850mb LLJ which may translate down along the Lower RGV possibly warranting a wind advisory. Rain chances remain limited Friday/Friday night as moisture content remains limited to the lowest 5000 feet and best energy lifts northeast ahead of the mid-level trough. Slight chance for a strong thunderstorm continue across the northern Ranchlands where cape values (~2000 j/kg), a weakening cap and enough moisture reside. Associated cold front moves across the CWA late Friday night/Sat AM with the potential of additional convection along the leading edge of the front. A much drier airmass and subtle surface ridging settles over the region Saturday and Sunday. Models continues to show a very dry atmosphere Saturday with surface RH crashing between 10-15 percent out west and 30s along the coast. Weak surface ridging quickly moves over Southcentral Texas with north winds weakening through the afternoon when the RH values will be tanking. The disconnect between highest wind and lowest humidity may limit the fire behavior danger to a few hours. Temperatures look to remain above average after several days of below average highs and lows. The hottest days continue to be Friday and Saturday.

Both GFS and ECMWF are on board with ridging taking over Sunday through Monday with pleasant and warm conditions. Next upstream trough moves into the Rockies and Plains Tuesday and Wednesday with the Southerly flow, Gulf moisture and temperatures increasing Tuesday and another potential front Wednesday.

MARINE:Now through Thursday Night . Moderate to strong northeasterly winds surged into the lower Texas coastal waters this morning behind a cold front. These winds will maintain hazardous marine conditions through the afternoon, with SCAs in effect and SCEC conditions to follow. As high pressure slides east tonight, winds will become more easterly overnight and southeasterly on Thursday. As the pressure gradient strengthens on Thursday evening, moderate wind speeds and building seas will make additional Small Craft Advisories possible.

Friday through Monday . Pressure gradient strengthens the southerly flow Friday in advance of a mid-level trough and cold front. Small craft advisories may be necessary as the south winds freshen during the morning and afternoon hours. The weak front moves through late Friday night or after sunrise Saturday with brief moderate north winds Saturday before tranquil conditions develop later Saturday and Sunday. High pressure shifts to the east and southerly flow begins to increase Monday with pressures lowering over NE Mexico.

PRELIMINARY POINT TEMPS/POPS. BAYVIEW/PORT ISABEL 70 65 78 73 / 10 10 10 30 BROWNSVILLE 74 67 80 74 / 10 10 10 30 HARLINGEN 70 64 79 72 / 10 10 20 20 MCALLEN 72 65 81 73 / 10 10 20 20 RIO GRANDE CITY 74 63 82 73 / 10 10 10 10 SOUTH PADRE ISLAND 71 68 75 73 / 10 20 10 30

BRO WATCHES/WARNINGS/ADVISORIES. TX . None. GM . Small Craft Advisory until 7 PM CDT this evening for GMZ170-175.



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

54-BHM/67-Mejia/65-Soria


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PTIT2 - 8779770 - Port Isabel, TX 6 mi50 min E 14 G 17 68°F 72°F1020.1 hPa
BZST2 8 mi50 min E 17 G 21 69°F 72°F1017 hPa
PCGT2 - 8779748 - South Padre Island CGS, TX 8 mi50 min E 12 G 16 68°F 72°F1017.8 hPa
RLIT2 8 mi56 min ENE 18 G 21 68°F 69°F1017.3 hPa
PMNT2 30 mi50 min 67°F 71°F1018.8 hPa
RSJT2 - 8777812 - Rincon del San Jose; Potrero Lopeno SW, TX 47 mi50 min E 9.9 G 14 65°F 68°F1018.7 hPa

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, TX3 mi45 minE 1210.00 miA Few Clouds67°F59°F76%1018.2 hPa
Brownsville, Brownsville / South Padre Island International Airport, TX18 mi45 minENE 910.00 miA Few Clouds67°F59°F76%1017.8 hPa
Harlingen, Rio Grande Valley International Airport, TX22 mi46 minE 910.00 miFair64°F61°F90%1018 hPa

Link to 5 minute data for KPIL

Wind History from PIL (wind in knots)
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Last 24hrSE7SE5SE5SE4SE4CalmNW5N4NW4N4----N16
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1 day agoNE5E4CalmCalmNW4NW3NW4NW4NW4N4N5NE3E9E6E9E11E12E12E13E12E11E11--E8
2 days agoNW6W3NW4W4W4NW5NW5N7N7NW6NW8NW8NW7N9NE7E8NE10E10
G18
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Tide / Current Tables for Port Isabel, Texas
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Port Isabel
Click for Map
Wed -- 03:24 AM CDT     Moonset
Wed -- 04:55 AM CDT     0.05 feet Low Tide
Wed -- 06:59 AM CDT     Sunrise
Wed -- 02:25 PM CDT     Moonrise
Wed -- 02:41 PM CDT     1.43 feet High Tide
Wed -- 07:55 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.30.20.100.10.20.40.60.91.11.21.41.41.41.41.31.31.21.11.110.9

Tide / Current Tables for Port Isabel, Texas (2)
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Port Isabel
Click for Map
Wed -- 03:24 AM CDT     Moonset
Wed -- 05:02 AM CDT     0.18 feet Low Tide
Wed -- 06:59 AM CDT     Sunrise
Wed -- 02:25 PM CDT     Moonrise
Wed -- 03:31 PM CDT     1.38 feet High Tide
Wed -- 07:55 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.80.60.40.20.20.20.30.40.50.70.91.11.21.31.41.41.31.31.21.21.11.11.1

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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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