Sunrise 6:40 AM   Sunset 8:13 PM Moonrise 4:49 PM   Moonset 3:41 AM

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GMZ130 Laguna Madre From The Port Of Brownsville To The Arroyo Colorado- Laguna Madre From The Arroyo Colorado To 5 Nm North Of Port Mansfield Tx- Laguna Madre From 5 Nm North Of Port Mansfield To Baffin Bay Tx- 333 Am Cdt Mon May 20 2024
Today - Southeast winds 5 to 10 knots, becoming east 10 to 15 knots late this afternoon. A light chop on the bay, increasing to a moderate chop on the bay late this afternoon. Tonight - Southeast winds 10 to 15 knots. A moderate chop on the bay. Tuesday - Southeast winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. A moderate chop on the bay, increasing to choppy bay waters in the afternoon. Hazy.Tuesday night - Southeast winds 15 to 20 knots. Choppy bay waters. Hazy early in the evening. Wednesday - Southeast winds 15 to 20 knots. Choppy bay waters. Hazy.Wednesday night - Southeast winds 15 to 20 knots. Choppy bay waters. Hazy early in the evening. Thursday - Southeast winds 15 to 20 knots. Choppy bay waters. Hazy.Thursday night - Southeast winds 15 to 20 knots. Choppy bay waters. Hazy early in the evening. Friday - Southeast winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. A moderate chop on the bay, increasing to choppy bay waters in the afternoon. Friday night - Southeast winds 15 to 20 knots, diminishing to 10 to 15 knots early in the morning. Choppy bay waters, diminishing to a moderate chop on the bay early in the morning.

GMZ100 333 Am Cdt Mon May 20 2024
Synopsis - Light to moderate winds and low to moderate seas will prevail along the lower texas coast through the period with high pressure in control. However, small craft should exercise caution may be needed beginning on Tuesday as the pressure gradient intensifies slightly.

FXUS64 KBRO 201119 AAA AFDBRO

Area Forecast Discussion...UPDATED National Weather Service Brownsville TX 619 AM CDT Mon May 20 2024

New AVIATION

SHORT TERM
(Today through Tuesday)
Issued at 249 AM CDT Mon May 20 2024

500 mb high pressure will continue to build northeast out of Mexico and increasingly be even more dominant over the BRO CWFA during the period. This will have the effect of not only producing dry weather, but also well above normal, and increasing, daytime high temperatures. Heat index values will max out between 105 and 110 degrees today, with isolated spots reaching 111 degrees. Thus, will not issue a Heat Advisory for today, but will instead cover the heat threat with a Special Weather Statement. However, for Tuesday, a Heat Advisory may very well be needed, with heat indices progged to max out at 111 to 112 degrees across a more widespread area. Will hold off on issuing a Heat Advisory for Tuesday for now, and address the issue in about 24 hours (if not less than that by a successive shift) after Monday highs are tabled and new model guidance is available.

LONG TERM
(Tuesday night through Sunday)
Issued at 249 AM CDT Mon May 20 2024

A broad 500 mb ridge centered over Mexico extending into Deep South Texas and the Rio Grande Valley will maintain rain-free conditions and above normal temperatures through the period. At the surface, steady low-level southeasterly to southerly flow will result in continued humid conditions across the area.

Dangerous heat will be the main concern through the week and into Memorial Day Weekend as the mid to upper level ridge continues to build. High temperatures are expected in the triple digits across the Rio Grande Plains Wednesday afternoon with mid to upper 90s across the rest of the area, except for the 80s along the coast. The triple digit heat will expand farther eastward through the week, reaching the I-69E/US 77 corridor by Friday. The high humidity combined with the hot temperatures will lead to "feels like" temperatures ranging from upper 90s along the beaches to around 112 degrees through Thursday, and closer to 114-118 degrees Friday through the weekend, across the Northern Ranchlands and Rio Grande Valley. Overnight temperatures will remain warm with lows in the upper 70s to the lower 80s. The "feels like" temperatures each night will remain in the upper 80s and low to mid 90s. Heat Advisories may be needed for portions of the region Wednesday and Thursday, and Heat Advisories and/or Excessive Heat Warnings will likely be needed this Memorial Day weekend.

This will result in a major to extreme risk of heat-related impacts, especially towards the end of the week and into the weekend. Staying properly hydrated, limiting time spent outdoors during the peak heating of the day, taking frequent breaks in the shade, and wearing light-colored, loose-fitting clothing will be necessary to prevent any heat related illnesses.

In addition, fair to poor air quality is expected to prevail through the long term for much of the Rio Grande Valley due to agricultural burning in southeast Mexico/Yucatan and Central American wildfires all being driven north/northwestward on the persistent south to southeast flow.

AVIATION
(12Z TAFS)
Issued at 617 AM CDT Mon May 20 2024

The aerodromes will continue to experience MVFR to VFR conditions through the next 24 hours.

MARINE
Issued at 249 AM CDT Mon May 20 2024

Today through Tuesday: Buoy 42020 reported east-southeast winds around 14 knots gusting to around 16 knots with seas slightly over 3.5 feet with a period of 7 seconds at 150 CDT/650 UTC. An initially modest pressure gradient along the Lower Texas Coast will strengthen slightly during the period, with high pressure generally in control. Light to moderate winds and low to moderate seas will become moderate to breezy winds and moderate seas during the period, and Small Craft Should Exercise Caution may be needed on Tuesday, especially for the Laguna Madre.

Tuesday night through Saturday...Light to moderate winds and generally moderate seas are expected through the weekend. A locally enhanced pressure gradient may result in a brief period of Small Craft Exercise Caution conditions each afternoon on the Laguna Madre and nearshore Gulf waters. Small Craft Exercise Caution conditions will extend to the offshore Gulf waters Wednesday through the holiday weekend due to increased winds and elevated seas.

PRELIMINARY POINT TEMPS/POPS
BROWNSVILLE 96 81 94 80 / 0 0 0 0 HARLINGEN 97 77 96 78 / 10 0 0 0 MCALLEN 101 80 98 80 / 0 0 0 0 RIO GRANDE CITY 101 78 101 78 / 0 0 0 0 SOUTH PADRE ISLAND 86 81 86 81 / 10 0 0 0 BAYVIEW/PORT ISABEL 91 79 92 79 / 10 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES
None.

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Port Isabel
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Mon -- 04:35 AM CDT     1.22 feet High Tide
Mon -- 04:40 AM CDT     Moonset
Mon -- 06:40 AM CDT     Sunrise
Mon -- 10:38 AM CDT     0.99 feet Low Tide
Mon -- 11:26 AM CDT     0.99 feet High Tide
Mon -- 05:48 PM CDT     Moonrise
Mon -- 08:11 PM CDT     Sunset
Mon -- 08:19 PM CDT     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Port Isabel, Texas, Tide feet

Matamoros
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Mon -- 03:12 AM CST     1.08 feet High Tide
Mon -- 03:42 AM CST     Moonset
Mon -- 05:41 AM CST     Sunrise
Mon -- 08:46 AM CST     0.82 feet Low Tide
Mon -- 10:45 AM CST     0.83 feet High Tide
Mon -- 04:49 PM CST     Moonrise
Mon -- 07:10 PM CST     -0.20 feet Low Tide
Mon -- 07:12 PM CST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Matamoros, Tamaulipas, Mexico, Tide feet

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