Marine Weather Net

Port Aransas to Matagorda Ship Channel Marine Forecast


TODAY

S
WINDS
10 - 15
KNOTS

TONIGHT

S
WINDS
15
KNOTS

THURSDAY

S
WINDS
10 - 15
KNOTS

THURSDAY NIGHT

S
WINDS
15
KNOTS

The Marine Weather Forecast In Detail:
GMZ255 Forecast Issued: 332 AM CDT Wed Jul 08 2020

Today...South Wind 10 To 15 Knots. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet.
Tonight...South Wind Around 15 Knots. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet.
Thursday...South Wind 10 To 15 Knots. Seas 3 To 4 Feet With Occasional Seas Up To 5 Feet.
Thursday Night...South Wind Around 15 Knots. Seas 3 To 4 Feet With Occasional Seas Up To 5 Feet.
Friday...South Wind 10 To 15 Knots. Seas 2 To 4 Feet With Occasional Seas Up To 5 Feet.
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.
Saturday Night...South Wind 10 To 15 Knots. Seas 2 To 3 Feet.
Sunday...South Wind 10 To 15 Knots. Seas 2 To 3 Feet.
Sunday Night...South Wind 15 To 20 Knots. Seas 2 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
332 AM CDT Wed Jul 8 2020

Weak to moderate south to southeast flow this morning will increase to moderate levels through the afternoon, especially across the bays and nearshore waters south of Port Aransas. Winds may approach advisory levels briefly this afternoon and again Thursday afternoon south of Port Aransas. A light to moderate onshore is expected through the weekend and into early next week. Dry conditions will persist.
Area Forecast Discussion
National Weather Service Corpus Christi TX
336am CDT Wednesday July 8 2020

Short Term - Today Through Thursday
Hot, humid and rain free conditions continue.

Main issue today and Thu will be the heat indices. Humid airmass combined with above normal temps will lead to heat indices of 105- 109 across the Victoria Crossroads and northern Coastal Bend to around 110 across the southern inland Coastal Bend to the Rio Grande Plains. A Heat Advisory has been issued for the southern Coastal Bend westward to the Rio Grande Plains for this afternoon. Heat advisory conditions are expected to be across a larger portion of S TX on Thu as upper level high pressure builds across S TX. Breezy south to southeast winds each afternoon will help with relief from the heat.

Although a mid/upper level trough is currently over TX today, the cap will be strong and PWATs (Precipitable Waters) are forecast to decrease. This will inhibit convection from developing. Can not rule out a streamer shower or two late tonight into early Thu morning, thus silent 5-10 probability of precipitation looks warranted. Otherwise, Thu also looks generally rain free.

Long Term - Thursday Night through Tuesday
With mid-level ridging over the region, the main story in the long term forecast period will be hot temperatures and high heat index values. 850mb temps warm gradually from 21-22C late-week to as high as 26C west and 24-25 east over the weekend and early next week. Compare this to average 850mb temps (east) around 19-20C, and its clear that temperatures will be hot across the region. Weekend values are at or above the 99th percentile of climatology. High temperatures in the mid 90s to 105 Friday will warm a few degrees by Sunday with even Corpus Christi approaching 100 degrees. Heat index values will be very high each day, but the highest values may be on Friday before somewhat drier air moves in, lowering dpts. Regardless, at least borderline head advisory conditions are expected daily through the end of the period.

Southeasterly flow Friday will become more southerly by the weekend with no mentionable rain possibilities in the forecast period.

Marine
Weak to moderate south to southeast flow this morning will increase to moderate levels through the afternoon, especially across the bays and nearshore waters south of Port Aransas. Winds may approach advisory levels briefly this afternoon and again Thu afternoon south of Port Aransas.A light to moderate onshore is expected through the weekend and into early next week. Dry conditions will persist.

NOAA Corpus Christi TX Office: Watches - Warnings - Advisories
TX...Heat Advisory from 1pm this afternoon to 6pm CDT this evening For the following zones: Duval...Inland Kleberg...Inland Nueces...Jim Wells...La Salle...Live Oak...McMullen...Webb.

GM...None.