textproduct: Corpus Christi

KEY MESSAGES

Updated at 514 AM CST Sun Dec 21 2025

- Dense Fog Advisory and Marine Fog Advisory in effect through this morning

- Low end rain chances (15-25%) Monday afternoon

- Warm and dry for most of Christmas week with daily chances for radiation/sea fog

DISCUSSION

Issued at 1214 AM CST Sun Dec 21 2025

With dewpoint temperatures in the 70s and water temps in the low 60s across the inland bays and barrier islands, sea fog has already developed (as per cameras and visibility sensors). For inland locations, radiation fog continues to spread across as we speak. For this reason, and in collaboration with neighboring offices, Dense Fog Advisories have been issued across the region through morning. Locations closer to I-10 will start seeing fog dissipation as early as sunrise with the weak cold front clearing things out. Most of the inland fog should clear out by 10 am, though ending time of the Dense Fog Advisory will be continuously re-evaluated. Sea fog is a bit trickier to determine its cessation, so used the latest CAMS to arrive at an 11am end time for the Marine Fog Advisory.

As mentioned before, a weak cold front attempts to move through the area, but it's a fizzling front. A wind shift may briefly occur this afternoon, but that's all the cold front wrote. By Monday, an approaching area of PVA from central Mexico will give us just enough ascent to support showers, but the issue with receiving any rainfall will be the lack of precipitable water to wring out (GEFS PWAT forecast for Monday ranges from 1.1-1.2" which falls within the 50th- 75 percentile of climatology for the end of December). The further south, the "greater" the PWATs, so this is why there are low end rain chances along the coast and in the southern Brush Country (10- 20% chances).

The remainder of Christmas week looks to remain dry and warm with temps generally 10 degrees above normal with daily chances for radiation fog and sea fog.

AVIATION

(12Z TAFS) Issued at 514 AM CST Sun Dec 21 2025

Poor aviation conditions will continue for the next few hours as most sites are sitting at IFR/LIFR. VFR conditions should return around 16-18z with light winds. Another night of fog and low ceilings is expected again tomorrow night starting as early as 05-06z. Due to uncertainty on the timing and how dense the fog will be as well as uncertainty with how low ceilings will get, went with only 2SM and BKN015 now.

MARINE

Issued at 1214 AM CST Sun Dec 21 2025

Southerly flow today will be light to gentle (BF 2-3) with a weak cold front fizzling out along the nearshore waters resulting in a variable wind direction this afternoon. By tonight, the prevailing wind direction returns from the southeast and will remain there through the weekend. Seas will generally be around 2-3 ft through Christmas day. In the offshore waters (20-60 nm offshore), seas increase to 3-4 ft from Wednesday night. Rain chances will be limited to Sunday night through Monday afternoon, but generally on the low end (20-30%).

FIRE WEATHER

Issued at 1214 AM CST Sun Dec 21 2025

A weak cold front moving in from Hill Country will result in winds being more northeasterly today while remaining under 10 mph. Dewpoint temperatures do not drop significantly (remaining in the lower 50s across La Salle/Webb counties), so this afternoon's min RH values generally remain above 35%. Low end rain chances (15-25%) will generally favor the coast and Brush Country, but the remainder of the week remains dry with min RH values remaining above 40% and Energy Release Component forecasts in the 25th-49th percentile, thus keeping the fire risk limited.

PRELIMINARY POINT TEMPS/POPS

Corpus Christi 78 65 80 66 / 0 10 20 0 Victoria 76 59 80 63 / 0 10 10 0 Laredo 81 61 83 67 / 0 0 10 0 Alice 80 63 83 65 / 0 10 20 0 Rockport 75 63 75 64 / 0 10 10 0 Cotulla 79 58 80 64 / 0 0 10 0 Kingsville 81 65 83 66 / 0 0 20 0 Navy Corpus 75 67 75 67 / 0 10 20 0

CRP WATCHES/WARNINGS/ADVISORIES

TX...Dense Fog Advisory until 10 AM CST this morning for TXZ229>234- 239>247-342>347-442-443-447.

GM...Dense Fog Advisory until 11 AM CST this morning for GMZ231-232- 236-237-250-255.