Marine Weather and Tide Forecast for Portland, TX

DISCUSSION
Issued at 121 AM CDT Tue Jul 28 2026

A mid-level high centered over New Mexico will maintain hot and mostly dry conditions through the weekend. Afternoon highs will generally range from the mid 90s near the coast to around 105 degrees across the western Brush Country, with heat index values commonly between 105 and 112 degrees, increasing towards 115 later in the week. Prompting a Heat Advisory for Tuesday afternoon/evening with more advisories likely to follow this week. HeatRisk will remain moderate to major across much of South Texas, with localized extreme values possible where the hottest temperatures persist.

A subtle pattern change is possible early next week as a mid-level trough extends southwestward from northeast of our region toward the Victoria Crossroads, along the eastern periphery of the ridge. This may provide enough lift and moisture for isolated showers and thunderstorms, with rain chances currently around 15-20%. Otherwise, no significant change in temperatures is expected.

AVIATION
(12Z TAFS)
Issued at 626 AM CDT Tue Jul 28 2026

Seeing a few low clouds in the VCT to ALI corridor tonight, but only brief periods of MVFR CIGS are expected. Chances for low clouds looks a bit better tonight. Have included mainly SCT conditions for now except at ALI, but may need to add tempo BKN groups later.

MARINE
Issued at 121 AM CDT Tue Jul 28 2026

A generally gentle to moderate onshore flow will persist through the period, with occasional fresh (BF 5) conditions during the evening and overnight hours. Seas will remain around 2-4 feet. Dry conditions are expected through the forecast period, with probabilities near zero.

FIRE WEATHER

Localized elevated fire weather conditions remain possible across the northwestern Brush Country during the latter half of the week, though confidence has decreased somewhat as the lowest RH values may not overlap with the stronger winds. Minimum RH values will fall into the mid 20% range, while ERC values remain near the 50th to 60th percentile. RFTI values increase to around 2 Friday, indicating a limited elevated fire weather threat when combined with the other factors. Critical fire weather conditions are not expected at this time.

PRELIMINARY POINT TEMPS/POPS
Corpus Christi 95 79 96 79 / 0 0 0 0 Victoria 96 77 96 76 / 0 0 0 0 Laredo 104 79 105 79 / 0 0 0 0 Alice 99 77 99 76 / 0 0 0 0 Rockport 89 82 91 81 / 0 0 0 0 Cotulla 104 79 104 78 / 0 0 0 0 Kingsville 97 78 97 77 / 0 0 0 0 Navy Corpus 92 82 92 81 / 0 0 0 0

CRP WATCHES/WARNINGS/ADVISORIES
TX...Heat Advisory from noon today to 7 PM CDT this evening for TXZ229>234-239>247-342>344-346-347.

GM...Small Craft Advisory from 10 AM this morning to 8 PM CDT this evening for GMZ231-232-250.