As Hurricane Delta moved northward across the Gulf of Mexico in early October, outgoing swell propagated into the lower Texas coastal waters on October 8th through the 10th. This swell was powerful enough to push water into the dunes across South Padre Island around high tide, which occurred at 12:11 AM CDT on the 8th, 1:15 AM CDT on the 9th, and 2:08 AM CDT on the 10th. The most significant erosion and overwash occurred during the pre-dawn hours of October 9th, as Delta passed directly over a NOAA buoy around 200 miles east of South Padre Island at around 1150 PM on October 8th. However, the highest *tide* level that was reported was 2.38 feet above Mean Higher-High Water (MHHW; or the level above normally dry ground at the shoreline) a day later at 3:42 AM CDT on the 10th. Levels remained above 1.25 feet MHHW for several hours surrounding the occurrence of high tide on the evenings of October 7th through the 10th. This activity was enough to cause some coastal erosion, with the more significant flooding and erosion occurring on the 9th, with additional run-up and lighter erosion on the 10th.
Farther up the coast, similar wave action and minor coastal flooding was likely - but there were no comparative measurements based on MHHW.

Storm Surge/Tide in COASTAL CAMERON, TEXAS
From 09-OCT-20 21:30:00 to 10-OCT-20 07:30:00 (CST-6)
Crop damage: 0.00K
Reported by: C-MAN Station

Continued high seas and swells propagating to the west from the long-departed Hurricane Delta (which made landfall at around 6 PM CDT on October 9th) produced another, though lesser, round of tidal run/up and overwash that may have produced a bit more beach erosion following the larger impacts a day earlier.  Seas at NOAA Buoy 42002, 200 miles east of South Padre Island, were still between 8 and 10 feet with swell continuing at 10 to 11 seconds.
The NOAA tide gauge at Brazos Santiago recorded a peak value of 2.38 feet above Mean Higher High Water (MHHW) at 3:42 am CDT on October 10th. Nearby gauges at Port Isabel and the South Padre Island Coast Guard Station recorded 2.44 ft (from 1:42-1:48 AM CST) and 2.41 ft (3:42 AM CDT) above MHHW respectively. The Realitos Peninsula gauge slowly peaked several hours later, recording 2.35 ft above MHHW from 9:18-9:24 AM CDT. The Realitos location was still in minor flooding stage and slowly rising while the previous 3 locations were reaching peak levels.

Storm Surge/Tide in COASTAL WILLACY, TEXAS
From 09-OCT-20 23:00:00 to 10-OCT-20 09:00:00 (CST-6)
Crop damage: 0.00K
Reported by: C-MAN Station

Continued high seas and swells propagating to the west from the long-departed Hurricane Delta (which made landfall at around 6 PM CDT on October 9th) produced another, though lesser, round of tidal run/up and overwash that may have produced a bit more beach erosion following the larger impacts a day earlier.  Seas at NOAA Buoy 42002, 200 miles east of South Padre Island, were still between 8 and 10 feet with swell continuing at 10 to 11 seconds.
A tide gage at Port Mansfield (inside Laguna Madre) rose above 1.5 feet above Mean Sea Level (MSL) around 12:00 AM CST October 10, and steadily rose through the following day. Peak levels of 1.77 ft above MSL from 11:36-11:54 PM CST. Water levels were then slow to fall, not falling back below 1.5 ft above MSL until around noon CST on October 12th.  Though the gage remained high through October 12th, rapid drop in landward push of swell likely reduced impacts on the barrier island. By late afternoon on the 10th, combined seas had fallen below 4 feet and swell period at or below 7 seconds at NOAA Buoy 42002.

Storm Surge/Tide in COASTAL KENEDY COUNTY, TEXAS
From 10-OCT-20 00:00:00 to 10-OCT-20 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Continued high seas and swells propagating to the west from the long-departed Hurricane Delta (which made landfall at around 6 PM CDT on October 9th) produced another, though lesser, round of tidal run/up and overwash that may have produced a bit more beach erosion following the larger impacts a day earlier.  Seas at NOAA Buoy 42002, 200 miles east of South Padre Island, were still between 8 and 10 feet with swell continuing at 10 to 11 seconds.
A tide gage at Rincon Del San Jose reached 1.92 feet above Mean Sea Level (MSL) around 7:18 PM CST on October 10th. Water levels peaked at 2.01 ft above MSL around 7:00 PM CST on October 11th. Levels then fell slightly to around 1.9 ft above MSL through 11:12 PM CST, after which water levels gradually fell through the end of the event.
Though the gage rose and peaked during the *evening* of October 10th, it's tides were inside Laguna Madre and were likely not representative of actual impacts on the beach, as wave heights fell below 4 feet and swell dropped below 7 seconds by the afternoon of October 10th at Buoy 42002.

Storm Surge/Tide in COASTAL CAMERON, TEXAS
From 08-OCT-20 20:00:00 to 09-OCT-20 09:00:00 (CST-6)
Crop damage: 0.00K
Reported by: NWS Storm Survey

The passage of Hurricane Delta about 200 miles east of South Padre Island at around midnight on October 9th produce peak sea heights of 35 feet just prior to the eye's arrival at 1140 PM CDT on the 8th. Swell periods of more than 12 seconds began during the late afternoon at the site, and propagated quickly to the Cameron County Beaches. Soon after the time of high tide (around 1:30 AM), tide levels reached 2.12 feet above normally dry ground at the foam/sand line (2:48 AM).  The combination of strong wave push with these above predicted tides produced significant beach erosion and some likely property damage at public beach access point 5 (north of the City), unprotected by dunes or the sea wall.  Visual inspection did show water had risen above previously calved dunes from Hurricane Laura and Tropical Storm Beta in late August and late September, respectively.  Renourishment costs were unknown as of this writing, but likely to run above $5 million based on data from earlier erosion from Hurricane Laura.

Storm Surge/Tide in COASTAL WILLACY, TEXAS
From 08-OCT-20 21:00:00 to 09-OCT-20 10:00:00 (CST-6)
Crop damage: 0.00K
Reported by: C-MAN Station

The passage of Hurricane Delta about 200 miles east of the Willacy County coast around 2 AM on October 9th produced peak sea heights of 35 feet just prior to the eye's arrival at 1140 PM CDT on the 8th. Swell periods of more than 12 seconds began during the late afternoon at the site, and propagated quickly to the Willacy County Beaches. Soon after the time of high tide (likely close to 2:30 AM based on proxy with Brazos Santiago on South Padre Island), the combination of strong wave push with these above predicted tides likely produced significant beach erosion on the beach-facing barrier island.

Storm Surge/Tide in COASTAL KENEDY COUNTY, TEXAS
From 08-OCT-20 23:00:00 to 09-OCT-20 12:00:00 (CST-6)
Crop damage: 0.00K
Reported by: C-MAN Station

The passage of Hurricane Delta about 200 to 225 miles east of the Kenedy County coast around 4 AM on October 9th produced estimated peak sea heights of 35 feet just prior to the eye's arrival at 1140 PM CDT on the 8th. Swell periods of more than 12 seconds began during the late afternoon at the site, and propagated quickly to the Kenedy County barrier island. Soon after the time of high tide (likely between 2:30 and 3:30 AM), the combination of strong wave push with these above predicted tides likely produced significant beach erosion on the beach-facing barrier island.