Marine Weather Net

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


TODAY

SE
WINDS
5 - 10
KNOTS

TONIGHT

SE
WINDS
10 - 15
KNOTS

FRIDAY

S
WINDS
10 - 15
KNOTS

FRIDAY NIGHT

SE
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
GMZ275 Forecast Issued: 332 AM CDT Thu Aug 22 2019

Today...Southeast Wind 5 To 10 Knots. Seas 3 Feet. Scattered Showers And Thunderstorms.
Tonight...Southeast Wind 10 To 15 Knots Shifting South After Midnight. Seas 3 To 4 Feet With Occasional Seas Up To 5 Feet. A Chance Of Showers And Thunderstorms.
Friday...South Wind 10 To 15 Knots. Seas 3 To 4 Feet With Occasional Seas Up To 5 Feet. Showers And Thunderstorms Likely.
Friday Night...Southeast Wind 10 To 15 Knots. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet. A Chance Of Showers And Thunderstorms.
Saturday...Southeast Wind 10 To 15 Knots. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet. A Chance Of Showers And Thunderstorms.
Saturday Night...South Wind 10 To 15 Knots. Seas 3 To 4 Feet With Occasional Seas Up To 5 Feet. A Slight Chance Of Showers And Thunderstorms.
Sunday...South Wind 10 To 15 Knots. Seas 3 To 4 Feet With Occasional Seas Up To 5 Feet. A Chance Of Showers And Thunderstorms.
Sunday Night...South Wind 10 To 15 Knots. Seas 3 To 4 Feet With Occasional Seas Up To 5 Feet. A Chance Of Showers And Thunderstorms.
Monday...South Wind 10 To 15 Knots. Seas 3 To 4 Feet With Occasional Seas Up To 5 Feet. A Chance Of Showers And Thunderstorms.
Monday Night...Southeast Wind Around 15 Knots. Seas 4 To 5 Feet With Occasional Seas Up To 6 Feet. A Chance Of Showers And Thunderstorms.
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Synopsis for Middle Texas coastal waters from Baffin Bay to Matagorda ship channel - GMZ200
332 AM CDT Thu Aug 22 2019

A weak to moderate onshore flow is expected through early next week. Increasing moisture will contribute to scattered showers and thunderstorms through Saturday night. Isolated to scattered showers and thunderstorms will continue to be possible into early next week.
Area Forecast Discussion
National Weather Service Corpus Christi TX
334am CDT Thu August 22 2019

Short Term - Today Through Friday
A trough in the mid levels just west of S TX and a trough in the upper atmosphere overhead, will combine with increasing moisture to produce isolated to scattered showers and thunderstorms today. The best chances for precipitation will remain over the northwest gulf waters due to much deeper moisture moving northward east of the TX coast toward Louisiana. However, sufficient moisture is expected to advect across S TX with PWATs (Precipitable Waters) increasing to around 2 inches. Thus, iso/scattered activity is expected along the sea breeze today, but is not expected to reach the Rio Grande Plains. Precip is expected to wane across S TX this evening, then begin to pick up toward Fri morning. The mid level trough is forecast to weaken while the upper trough shifts east of the area with a ridge starting to build across the area from the west. Moisture and instability is expected to be the same Fri as today, thus another active sea breeze is expected across mainly the eastern CWA.

Heat indices are expected to reach 105-109 across mainly the Victoria Crossroads and Coastal Bend this afternoon. A Special Weather Statement has been issued for the eastern CWA to address the heat indicies. Heat indices may briefly approach 105 across portions of the western CWA but should only be for an hour or so. The heat indices of 105-109 is forecast to be more widespread Fri as the upper ridge begins moving across the area.

Long Term - Friday night through Wednesday
The high pressure ridge that has persisted over the area for some time should continue to drift just far enough north for a weak trough to drift west under the ridge across the northern Gulf. The trough should bring in some moisture to South Texas, but models indicate that the majority of the moisture will stay over the Gulf waters. Models have continued the trend of lowering POPs over the weekend and through early next week over the Brush Country and Coastal Plains. Will continue chance and likely showers and thunderstorms over the waters, but expect most of the activity over land to be seabreeze driven.

Models do continue to indicate upper support for some isolated to scattered showers and thunderstorms over the Brush Country Monday and Tuesday, but timing is questionable. The GFS has been quite aggressive with this, but with other model solutions in better agreement, will continue to keep POPs lower than the GFS.

Temperatures will continue to be warm though with increased cloud cover, expect temperatures to be slightly more moderate. With higher relative humidities, the heat index values will continue to be around 105 to 109, with some locations in the Coastal Plains briefly reaching 110.

Marine Discussion
Weak to moderate onshore flow is expected today through Friday. Increasing moisture will contribute to isolated to scattered showers and thunderstorms today through tonight, then becoming more scattered to numerous Friday as deeper moisture surges northward across the northwest gulf.Weak to moderate onshore flow is expected through early next week. Increasing moisture will contribute to scattered showers and thunderstorms through Saturday night. Isolated to scattered showers and thunderstorms will continue to be possible into early next week.

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