textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1155 AM CDT Thu Mar 26 2026

Key Messages:

* Unseasonably warm, mainly rain-free, and at times breezy conditions to prevail through next week.

* There is a low-medium (20-50%) risk for showers and thunderstorms on Saturday in response to a nearby frontal boundary.

* Borderline elevated wildfire conditions will prevail through next week.

* Generally favorable marine conditions will persist through next Monday with low to moderate seas and winds.

DISCUSSION

Issued at 1155 AM CDT Thu Mar 26 2026

Unseasonably warm, mostly rain-free, and at times breezy conditions will prevail through next week across Deep South Texas and the Rio Grande Valley. A weakened, but still anomalously strong 582-588 dam heat ridge will propagate from the Southwest U.S. to the south-central U.S., and finally to the Southeast CONUS by next week. This feature along with positive geopotential heights will drive our warm and dry weather pattern through next week.

An approaching frontal boundary could set off some isolated to scattered showers and thunderstorms on Saturday. We currently have low-medium (20-50%) chances of showers and thunderstorms on Saturday with the highest chances over the mid to lower Rio Grande valley (RGV).

Daytime high temperatures will range between the upper 80s near the coast to the mid-upper 90s west of IH-69C each day. The exception will be on Saturday, where high temperatures will be in the low to mid 80s, courtesy of the nearby frontal boundary. Overnight low temperatures will mainly be in the 60s. Wednesday night and Thursday night, lows could be in the lower 70s along the RGV.

AVIATION

(18Z TAFS) Issued at 1113 AM CDT Thu Mar 26 2026

Through 18z Friday....VFR conditions are expected to persist through the 18z TAF period. Skies will be mainly SKC, with the exception of a SCT-BKN deck of diurnally driven cumulus clouds each afternoon.

Winds will be breezy out of the south-southeast 7-15 kts through the forecast period. Winds will gusts 20-30 kts during the afternoon hours.

MARINE

Issued at 1155 AM CDT Thu Mar 26 2026

Generally favorable marine conditions with low to moderate winds and seas are expected to persist through Monday of next week. Small Craft Exercise Caution (SCEC) conditions could develop Monday evening through Thursday of next week.

FIRE WEATHER

Issued at 1155 AM CDT Thu Mar 26 2026

Minimum relative humidity (RH) values, breezy southerly winds, and an ongoing drought will yield borderline elevated wildfire concerns through next week.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 67 87 66 83 / 0 0 10 50 HARLINGEN 63 91 62 85 / 0 0 10 40 MCALLEN 68 94 67 88 / 0 0 10 50 RIO GRANDE CITY 65 96 64 87 / 0 0 20 40 SOUTH PADRE ISLAND 71 79 69 77 / 0 0 10 40 BAYVIEW/PORT ISABEL 66 86 64 81 / 0 0 10 40

BRO WATCHES/WARNINGS/ADVISORIES

TX...None. GM...None.