Marine Weather Net

Baffin Bay to Port Aransas 20 - 60 NM Marine Forecast


TONIGHT

SE
WINDS
5 - 10
KNOTS

WEDNESDAY

SE
WINDS
5 KNOTS

WEDNESDAY NIGHT

SE
WINDS
5 - 10
KNOTS

THURSDAY

SE
WINDS
5 KNOTS

The Marine Weather Forecast In Detail:
GMZ270 Forecast Issued: 329 PM CDT Tue Jul 27 2021

Tonight...Southeast Wind 5 To 10 Knots. Seas 2 Feet.
Wednesday...Southeast Wind Around 5 Knots Shifting East In The Afternoon. Seas 2 Feet. A Slight Chance Of Showers And Thunderstorms In The Morning.
Wednesday Night...Southeast Wind 5 To 10 Knots. Seas 2 Feet. A Slight Chance Of Showers And Thunderstorms After Midnight.
Thursday...Southeast Wind Around 5 Knots Shifting East In The Afternoon. Seas 2 Feet. A Slight Chance Of Showers And Thunderstorms.
Thursday Night...Southeast Wind Around 10 Knots Shifting South After Midnight. Seas 2 Feet.
Friday...Southeast Wind 5 To 10 Knots. Seas 2 To 3 Feet. A Chance Of Showers And Thunderstorms.
Friday Night...South Wind 10 To 15 Knots. Seas 2 To 3 Feet.
Saturday...South Wind 5 To 10 Knots. Seas 2 To 3 Feet. A Slight 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.
Sunday...South Wind 10 To 15 Knots. Seas 3 To 4 Feet With Occasional Seas Up To 5 Feet.
Sunday Night...South Wind 10 To 15 Knots. Seas 3 To 4 Feet With Occasional Seas Up To 5 Feet.
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Synopsis for Middle Texas coastal waters from Baffin Bay to Matagorda ship channel - GMZ200
329 PM CDT Tue Jul 27 2021

A light and variable, but mostly onshore flow is expected tonight. Onshore flow will become weak to moderate by Wednesday afternoon into Wednesday evening then light late Wednesday night. A weak onshore flow will continue through Thursday then increase to weak to moderate by the weekend. Isolated showers or thunderstorms are expected late tonight into early Wednesday morning then again late Wednesday night. Isolated showers or thunderstorms will be possible daily through Saturday.
Area Forecast Discussion
National Weather Service Corpus Christi TX
336pm CDT Tuesday July 27 2021

Short Term - Tonight Through Wednesday Night
A mid/upper level inverted trough draped along the TX and Mexico coast will move west across the region tonight. By Wednesday afternoon the trough axis is forecast to be just west of S TX. This will result in a deep southeast flow that will usher deeper moisture into S TX. A weak surface trough associated with the upper trough, is forecast to develop early Wednesday morning. This will provide low level moisture convergence for isolated convection across the Middle Texas Coastal Waters and along the coast. CAPE values are forecast to increase during the day Wed. PWATs (Precipitable Waters) range from 1.7 to 2 inches which shifts west with the trough. This results in the isolated convection shifting inland with the sea breeze/surface trough through Wednesday afternoon. By Wednesday evening the isolated convection is expected to be along the Rio Grande. Another round of isolated convection is expected to develop over the waters and along the coast late Wednesday night/early Thu morning.

As for fog potential, patchy fog is expected to briefly develop early Wednesday morning. Due to an increase in clouds Wednesday night, the potential for fog to develop will be low.

Heat indices ranging from 105 to 109 are expected by Wednesday afternoon due to the increasing low level moisture combined with very warm temps.

.LONG TERM (Thursday through Tuesday)... Long-term forecast remains hot and dry as high pressure continues to dominate South Texas. Could see some isolated showers and thunderstorms in the afternoons over the Victoria Crossroads and Coastal Bend Thursday into Friday as low-level moisture combines with a shortwave trough. Slight Probability of Precipitation continue through the weekend and into next week as an inverted trough moves through South Texas. Forcing with this feature is weak, so not expecting much in the way of precipitation.

Heat indices will be in the 105-109 degree range for most of South Texas through the long-term period. Portions of South Texas could see heat index values reach advisory criteria Friday as values reach and exceed 110 degrees. Heat Advisory conditions remain possible over the weekend and into early next week. Remember to stay hydrated and take frequent breaks with outdoor activities.

Marine
A light and variable, but mostly onshore flow is expected tonight. Onshore flow will become weak to moderate by Wednesday afternoon into Wednesday evening then light once again late Wednesday night. Isolated showers or thunderstorms are expected late tonight into early Wednesday morning then again late Wednesday night. Generally dry conditions will continue through the week, with isolated showers and thunderstorms becoming possible each afternoon. Weak onshore flow will increase to weak to moderate by the weekend.

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