Marine Weather Net

Laguna Madre from the Arroyo Colorado to Port Mansfield, TX Marine Forecast


5 - 10


5 - 10


5 - 10


5 - 10

The Marine Weather Forecast In Detail:
GMZ132 Forecast Issued: 319 PM CDT Mon Oct 18 2021

Tonight...Southeast Winds 5 To 10 Knots. A Light Chop On The Bay.
Tuesday...East Winds 5 To 10 Knots. A Light Chop On The Bay.
Tuesday Night...Southeast Winds 5 To 10 Knots. A Light Chop On The Bay.
Wednesday...Southeast Winds 5 To 10 Knots. A Light Chop On The Bay.
Wednesday Night...Southeast Winds 5 To 10 Knots. A Light Chop On The Bay.
Thursday...East Winds 5 To 10 Knots. A Light Chop On The Bay. Slight Chance Of Showers And Thunderstorms In The Afternoon.
Thursday Night...East Winds 5 To 10 Knots Becoming Southeast After Midnight. A Light Chop On The Bay Subsiding To Smooth After Midnight.
Friday...East Winds Around 5 Knots Increasing To 5 To 10 Knots In The Afternoon. Smooth On The Bay Building To A Light Chop In The Afternoon. Slight Chance Of Showers And Thunderstorms.
Friday Night...Southeast Winds 5 To 10 Knots. A Light Chop On The Bay.
Saturday...Southeast Winds 5 To 10 Knots. A Light Chop On The Bay. Slight Chance Of Showers And Thunderstorms.
Saturday Night...Southeast Winds 5 To 10 Knots. A Light Chop On The Bay. Slight Chance Of Showers And Thunderstorms.
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Synopsis for Baffin Bay to Rio Grande out 60 nm: GMZ100
319 PM CDT Mon Oct 18 2021

High pressure ridge will extend from the southeast United States through the Texas coastal waters through Wednesday. A reinforcing ridge will move into north and east Texas Thursday and Friday and extend through the waters. Favorable marine conditions are expected through the period.
Area Forecast Discussion
...UPDATED National Weather Service Brownsville TX
621pm CDT Monday Oct 18 2021

/issued 300pm CDT Monday Oct 18 2021/

Short Term - Now through Tuesday night
Little change to the going forecast, which is dominated by fair weather with a gradual return to more average mid-late October temperatures and humidity by Tuesday/Tuesday night. These conditions courtesy of modifying (warming) air mass on the backside of surface high pressure over the southeast U.S. as well as the area being on the backside of flat 500 mb ridge that will center over the south-central Gulf Tuesday and Tuesday night.

In terms of sensible weather...expect to see more mid and high clouds, along with scattered fair weather cumulus, from early Tuesday through Tuesday night courtesy of broad west-southwest flow aloft pulling in some deeper moisture from the eastern subtropical Pacific. Otherwise, given the slow rise in dewpoints, lengthening night, and long period of light winds, have blended in some patchy light fog to cover the King Ranch region of Brooks/Kenedy south through the rural areas of the mid/lower Valley late tonight. Not as confident in fog early Wednesday...but elected to add given similar conditions even though temperatures will be a touch warmer...upper 60s in these areas by daybreak Wednesday.

Temperatures will be right around seasonal normals (upper 80s by afternoon, 65-70 by daybreak) Tuesday/Tuesday night after one more slightly cooler than average night tonight.

Long Term - Wednesday through Monday
Upper and midlevel flow will remain largely zonal to begin the long term. The lack of any appreciable troughs/waves in the pattern combined with low RH at midlevels allows for fair and warm weather to continue, with temperatures rising to near or even slightly above seasonal normals. A few very weak and diffuse midlevel shortwaves may help to induce some weak disturbances, the lift from which will help increase atmospheric moisture on Thursday. The increasing moisture and added weak forcing may allow for some widely scattered showers or thunderstorms to develop Thursday through Saturday. The best chances for any precipitation chances look to be across far eastern portions of the CWA and especially over the Gulf Waters.

The synoptic pattern then becomes a bit more interesting and amplified for the latter portion of this weekend. A strong upper trough over the Pacific Northwest will begin to dig in over the western US while also helping to amplify a ridge over the Central/Midwestern US. This results in a general pattern of weak troughiness setting up over western Texas. At the same time, medium to long range guidance is hinting at a tropical cyclone developing off the southwestern Mexican coast later this coming weekend. The strong upper trough will likely help to pull this system inland, which in turn may drag a plume of moisture northward across central Mexico and into the south-central US. The GFS remains the more bullish model in terms of rainfall for next week, with the ECMWF (European Centre for Medium-Range Weather Forecasts) keeping the CWA mostly dry. While it is far too early to comment on specific timing and magnitude of rainfall given the current uncertainty stemming from model discrepancies, the pattern looks at least somewhat favorable for some enhanced rainfall during the early portion of next week.

ow through Tuesday Night): Light winds and slight to moderate seas will dominate the period under the aforementioned high pressure ridge. Seas had dropped to 3 feet this afternoon and period had dipped to 6/7 seconds as well...and with steady-state 10 knot winds...perhaps 10-13 knots Tuesday evening...see a bit more drop into the 2-3 feet range this evening holding through early Wednesday. Laguna Madre winds should dip to 5 knots or less by midnight and continue through late morning Tuesday before the usual afternoon pickup...before dropping back later Tuesday night.

Bottom line? Ideal boating and fishing conditions for those headed out.

Wednesday through Saturday: Broad high pressure at the surface will remain nearly anchored over the southeastern US and western Atlantic. This will favor light to occasionally moderate winds at times and subsequently lower seas. Low pressure developing over the Central Plains on Saturday may help to strengthen the surface pressure gradient, with winds perhaps reaching SCEC levels by Saturday evening. The main concern for mariners in the meantime remains the slight chance for scattered showers and thunderstorms Thursday through Saturday as a series of weak midlevel waves and disturbances move over the region.

NOAA Brownsville TX Office: Watches - Warnings - Advisories
TX...None. GM...None.