Sunrise 6:40 AM   Sunset 8:13 PM Moonrise 3:57 PM   Moonset 3:13 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- 313 Pm Cdt Sun May 19 2024
Tonight - East winds around 10 knots, becoming southeast after midnight. Light chop on the bay. Hazy this evening. Monday - Southeast winds 5 to 10 knots, increasing to 10 to 15 knots late in the afternoon. Light chop on the bay, increasing to a moderate chop late in the afternoon. Hazy in the afternoon. Monday night - Southeast winds 10 to 15 knots. A moderate chop on the bay. Hazy until early morning. Tuesday - Southeast winds 10 to 15 knots, increasing to 15 to 20 knots late in the afternoon. A moderate chop on the bay, increasing to choppy late in the afternoon. Hazy.Tuesday night - Southeast winds 15 to 20 knots, diminishing to 10 to 15 knots early in the morning. Choppy on the bay, diminishing to a moderate chop early in the morning. Hazy early in the evening. Wednesday - Southeast winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. A moderate chop on the bay, increasing to choppy in the afternoon. Hazy.Wednesday night - Southeast winds 15 to 20 knots. Choppy on the bay. Hazy early in the evening. Thursday - Southeast winds 15 to 20 knots. Choppy on the bay. Hazy.Thursday night - Southeast winds 15 to 20 knots. Choppy on the bay. Hazy early in the evening. Friday - Southeast winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Choppy on the bay. Friday night - Southeast winds 10 to 15 knots. A moderate chop on the bay.

GMZ100 313 Pm Cdt Sun May 19 2024
Synopsis -
weak onshore flow along with dry and hazy conditions will persist today across the lower texas coastal waters. Onshore flow will begin to increase by Monday afternoon due to low pressure developing in the plains. That strengthening trend with the onshore flow will continue throughout the week. Seas will gradually respond and build to 4 to 6 feet by midweek. As a result, small craft should exercise caution conditions are expected by midweek due to an increase in both winds and seas. Generally dry and hazy conditions will persist throughout the week.

FXUS64 KBRO 191927 AFDBRO

Area Forecast Discussion National Weather Service Brownsville TX 227 PM CDT Sun May 19 2024

New SHORT TERM, LONG TERM, MARINE

SHORT TERM
(Tonight through Monday night)
Issued at 148 PM CDT Sun May 19 2024

The main weather story will continue to be the building heat through the short-term period and beyond. This is due to a mid/upper level ridge axis anchored across Mexico expanding into Texas and the remainder of the Southern Plains over the next few days. Strong subsidence and limited moisture depth will keep a rain-free forecast going. It does appear that we will have one more day on Monday where heat advisory criteria (111 degree heat indices) will be just shy of being met for most of the area. A few isolated locations will likely reach 111 heat index or just exceed it for an hour or two but not long enough or widespread enough to warrant a heat advisory at this time for Monday. Heat indices will generally peak between 105 and 110 degrees on Monday.

Geocolor satellite imagery continues to depict the core of the agricultural smoke/haze over the open Gulf with the periphery of this affecting portions of our CWA Based upon the RAP-Smoke and GEOS-5 models forecast of vertically integrated smoke and total aerosols, have decided to add haze to the weather grids through Monday.

LONG TERM
(Tuesday through next Sunday)
Issued at 148 PM CDT Sun May 19 2024

Key Messages:

- Above normal temperatures and heat index values are expected across Deep South Texas this week and Memorial Day weekend.

- The combination of above normal temperatures and humidity will yield dangerous heat index values in the 110-120 degree range during the day, and in the upper 80s to low 90s overnight.

- There will be an increased risk of heat related impacts, especially those that do not take adequate breaks in the shade or stay hydrated.

- Poor air quality will continue through the week for most of the region.

Mid/upper level ridging centered over Mexico will maintain rain-free conditions and above normal temperatures across Deep South Texas into Memorial Day weekend. Meanwhile, persistent low level southerly to southeasterly flow will result in continued humid conditions at the surface. In addition to the heat and humidity, low level winds will continue to transport smoke associated with agricultural burning in southeast Mexico, which will maintain poor air quality across portions of the region.

A steady increase in temperatures is expected through the week and into the weekend as the ridge continues to build, with afternoon high temperatures ranging from the mid to upper 80s along the Lower Texas beaches, mid to upper 90s along/east of I-69, and above 100 degrees (100-106 degrees) west of I-69. In combination with the humidity, "feels like" temperatures will range from upper 90s along the Lower Texas 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. In comparison to the early May heat wave, one notable difference is the forecast of higher minimum temperatures each night... with most of the Rio Grande Valley expected to observe low temperatures in the low 80s.
In combination with the high dew points in place, there won't be much relief from the heat overnight as "feels like" temperatures remain in the upper 80s and low to mid 90s.

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.

Heat headlines may be needed for portions of the region Wednesday and Thursday, and will likely be needed this Memorial Day weekend.
Regardless of the issuance of any heat products (Heat Advisory, Excessive Heat Warning), the prolonged period of oppressive daytime and nighttime temperatures will limit the ability to recover from the heat, especially if spending several hours outside during the day. If you have any outdoor plans this weekend for Memorial Day or attending outdoor graduation ceremonies, make sure you are taking the oppressive heat into account.

AVIATION
(18Z TAFS)
Issued at 1122 AM CDT Sun May 19 2024

Thermal mixing has allowed most areas to rise to the VFR category as of 16Z today. By 18Z this afternoon, all RGV TAF sites are expected to be at the VFR category and remain at that level through around 03-04Z. By that time in the evening, MVFR low clouds will once again begin developing across the RGV TAF sites.
Much less fog is expected tonight given the less favorable slightly stronger southeast flow. Could still see patchy IFR conditions but overall we are anticipating MVFR conditions through tonight and persisting into the morning hours.

Widespread haze reducing visibilities at times to 4-6 miles will continue to affect at least the KBRO and KHRL TAF sites through the period and beyond.

MARINE
Issued at 148 PM CDT Sun May 19 2024

Tonight through Monday night...Generally weak onshore flow will continue tonight. However 3-4 ft swells will persist but are expected to slowly decay through the short-term. Overall, this will tend to maintain a moderate risk of rip currents through tonight with a borderline moderate risk of rips on Monday. The flow will continue to veer through Monday as a more climatologically normal return flow setup establishes itself. A bit more in the way of a moderate onshore flow as a result will establish itself by Monday afternoon and continue through Tuesday morning. Seas will slowly respond and build back to 4 ft overnight on Monday.

Tuesday through Saturday...Light to moderate winds and 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 Thursday and Friday due to increased winds and seas slightly building.

PRELIMINARY POINT TEMPS/POPS
BROWNSVILLE 79 95 80 94 / 0 0 0 0 HARLINGEN 75 97 77 97 / 0 0 0 0 MCALLEN 78 100 79 99 / 0 0 0 0 RIO GRANDE CITY 77 100 77 101 / 0 0 0 0 SOUTH PADRE ISLAND 80 86 81 86 / 0 0 0 0 BAYVIEW/PORT ISABEL 78 92 79 92 / 0 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES
TX...None.
GM...None.

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Port Isabel
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Sun -- 03:25 AM CDT     1.05 feet High Tide
Sun -- 04:12 AM CDT     Moonset
Sun -- 06:40 AM CDT     Sunrise
Sun -- 08:26 AM CDT     0.86 feet Low Tide
Sun -- 12:22 PM CDT     0.97 feet High Tide
Sun -- 04:55 PM CDT     Moonrise
Sun -- 07:57 PM CDT     0.22 feet Low Tide
Sun -- 08:10 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Port Isabel, Texas, Tide feet

Port Isabel
Click for Map
Sun -- 04:12 AM CDT     Moonset
Sun -- 04:13 AM CDT     1.20 feet High Tide
Sun -- 06:40 AM CDT     Sunrise
Sun -- 08:09 AM CDT     0.90 feet Low Tide
Sun -- 02:42 PM CDT     1.11 feet High Tide
Sun -- 04:55 PM CDT     Moonrise
Sun -- 07:57 PM CDT     0.29 feet Low Tide
Sun -- 08:10 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Port Isabel, Texas (2), Tide feet

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Brownsville, TX,