Marine Weather Net

Port Aransas to Matagorda Ship Channel 20 - 60 NM Marine Forecast


TODAY

SW
WINDS
5 - 10
KNOTS

TONIGHT

S
WINDS
5 - 10
KNOTS

SUNDAY

S
WINDS
5 - 10
KNOTS

SUNDAY NIGHT

S
WINDS
10
KNOTS

The Marine Weather Forecast In Detail:
GMZ275 Forecast Issued: 241 AM CDT Sat Jul 20 2024

Today...Southwest Winds 5 To 10 Knots, Becoming West Late This Morning, Then Becoming South Early This Afternoon, Becoming Southeast Late. Seas Around 2 Feet This Morning, Then Around 2 Feet Or Less. Wave Detail: South 1 Foot At 3 Seconds And Southeast 1 Foot At 6 Seconds, Becoming South 1 Foot At 5 Seconds. A Chance Of Showers And Thunderstorms, Mainly This Morning.
Tonight...South Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds.
Sunday...South Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. A Chance Of Thunderstorms. Showers Likely, Mainly In The Morning.
Sunday Night...South Winds Around 10 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. A Chance Of Showers And Thunderstorms After Midnight.
Monday...South Winds Around 10 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 5 Seconds. Showers Likely With A Chance Of Thunderstorms In The Morning, Then A Slight Chance Of Showers And Thunderstorms In The Afternoon.
Monday Night...Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: South 2 Feet At 5 Seconds. A Chance Of Showers After Midnight.
Tuesday...South Winds 5 To 10 Knots. Seas 2 To 3 Feet. A Chance Of Thunderstorms. Showers Likely, Mainly In The Morning.
Tuesday Night...Southeast Winds Around 10 Knots. Seas Around 3 Feet. Showers Likely With A Chance Of Thunderstorms After Midnight.
Wednesday...South Winds Around 10 Knots. Seas Around 3 Feet. A Chance Of Thunderstorms. Showers.
Wednesday Night...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. A Chance Of Showers And Thunderstorms. Winds And Seas Higher In And Near Thunderstorms.
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Area Forecast Discussion
National Weather Service Corpus Christi TX
639am CDT Sat July 20 2024

Long Term
(Sunday night through next Friday) Issued at 244am CDT Sat July 20 2024

Key Messages:

- Increasing moisture will lead to higher rain chances next week.

- Marginal Risk of excessive rainfall and flash flooding Monday.

- Slight Risk of excessive rainfall and flash flooding Tuesday and Wednesday.

Through much of the long-term period, South Texas will be positioned between two high-pressure systems. One will be over the western CONUS and the other in the western Atlantic. Between these high- pressure areas, an upper-level trough will deepen across the Mississippi River Valley late this weekend through the middle of next week, eventually extending southwestward into our area. The combination of these features along with the arrival of deep moisture from the Gulf (PWATs (Precipitable Waters) generally above 2.0 inches, reaching up to 2.4-2.5 inches at times) and several mid-level shortwaves providing positive vorticity advection, will lead to increased rain and thunderstorm chances through much of the long-term period.

Starting Sunday night into Monday morning, precipitation chances will range from 20-50% over the eastern portions of the CWA. Chances will then increase from east to west through Wednesday of next week, persisting through the end of the work week and into the next weekend. The highest chances are expected Tuesday and Wednesday, when probabilities will reach 60-90%. Rainfall accumulations of around 1-3 inches are forecast through late week across the region, with the highest amounts expected over the Victoria Crossroads and Coastal Plains.

Given this setup, the Weather Prediction Center (WPC) has maintained a Marginal Risk (level 1 out of 4) of excessive rainfall from Monday through Tuesday morning. However, starting Tuesday and continuing through Thursday morning, the WPC has introduced a Slight Risk (level 2 out of 4) of excessive rainfall. Heavy rainfall could lead to the potential for scattered flash flooding. This extended period of rainy weather will coincide with "cooler" temperatures, with highs dropping from the low to upper 90s on Monday to the mid 80s to low 90s through the end of the work week.

Marine
Issued at 244am CDT Sat July 20 2024

Weak variable winds this morning will shift south to southeasterly this afternoon and persist through the weekend. Low to medium chances of showers and thunderstorms today, will diminish tonight before ramping back up to a 50-80% chance Sunday. Weak to occasionally moderate south to southeasterly flow will persist through next week. Low to medium rain chances of 20 to 50 percent early Monday morning will increase to medium to high chances of 60 to 90 percent heading into the middle of next week.

NOAA Corpus Christi TX Office: Watches - Warnings - Advisories
TX...None. GM...None.