S. Four Corners region and extending southeast through north Texas combined with light southeast flow and ample surface humidity across the Lower Rio Grande Valley to produce a few days of apparent temperature values briefly at or just below local Heat Advisory criteria (110F to 111F).
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BRO wrote it up.
A summertime ridge of atmospheric high pressure centered over the U.S. Four Corners region and extending southeast through north Texas combined with light southeast flow and ample surface humidity across the Lower Rio Grande Valley to produce a few days of apparent temperature values briefly at or just below local Heat Advisory criteria (110F to 111F).
Values reached 111F or higher in southern Hidalgo County for around 2 hours on the 8th; values reached near these values on the 9th through 12th but did not last for more than an hour in any location.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Brownsville, TX wrote its last area forecast discussion before the first event at Aug 8, 5:11 AM CST, 6 hours 19 minutes earlier.
Area Forecast Discussion...UPDATED
National Weather Service Brownsville TX
611 AM CDT Thu Aug 8 2024
...New AVIATION...
.SHORT TERM...
(Today through Friday)
Issued at 254 AM CDT Thu Aug 8 2024
High pressure remains anchored across the western Gulf of Mexico as
the mid level ridge edges a bit southeast from the Four Corners into
Central Texas by the end of the week. As a result, temperatures may
nudge a degree or two above normal, with triple digit heat reaching
into the lower valley once again both today and Friday afternoon. A
very brief and isolated shower or thunderstorm may develop along the
sea breeze both this afternoon and Friday afternoon, with POPs
remaining under 10 percent. Any development likely dies fairly
quickly as the sea breeze outruns it.
Heat Indices approach Heat Advisory criteria for 2 to 3 hours this
afternoon across portions of Willacy, Cameron and southern Hidalgo
counties. With RH values increasing nearly 5 percent across the
board this afternoon compared to Wednesday afternoon and multiple
locations just falling shy of advisory criteria on Wednesday, will
issue a mid-afternoon Heat Advisory accompanied with an SPS for
neighboring counties. Locations outside of the advisory will likely
reach 110 degrees this afternoon for an hour or two. A very similar
setup is possible on Friday with humidity bumping up a few percent
once again.
&&
.LONG TERM...
(Friday night through Wednesday)
Issued at 254 AM CDT Thu Aug 8 2024
Not much has changed in the long term forecast as a strong mid-level
ridge, centered over northern and central Texas, will continue to
hold hot temperatures. Models are in fair agreement that the ridge
aloft will maximize in intensity Friday into later Saturday,
weaken slightly and reposition farther north Sunday into Monday
and then slowly rebuild southward into the middle of next week. At
the surface, a high pressure over the Gulf of Mexico will
continue to advect moist air into the region within the gentle to
light southeasterly to southerly flow.
Slight weakening of the ridge aloft may allow moisture of weak
disturbances over the Gulf of Mexico to infiltrate into the region
by the later part of the weekend. There is a slight chance of
isolated convection along the seabreeze on Sunday in Cameron County,
mainly east of Interstate 69, in the afternoon and evening hours.
Yet, the best chances of isolated to scattered showers and
thunderstorms look to be on Monday with a chance of convection
initiating ahead of the seabreeze boundary in Coastal Cameron County
by Monday morning. Throughout the day, the best chances will remain
across Cameron County but probabilities will also expand into
Coastal Willacy and Kenedy Counties as the boundary progresses
westward and extends northward. As the ridge begins to rebuild going
into Tuesday, the chances of seabreeze-induced convection will be
reduced, more isolated in coverage, limited to the afternoon and
evening hours as well only likely to occur in the lower RGV.
As far as temperatures, daytime highs will continue to be average to
slightly above average with upper 80s to lower 90s across the
barrier islands, mid to upper 90s across the coastal counties and
eastern portion of Hidalgo County as well as lower 100s across much
of the rest of Deep South Texas and including western parts of
Kenedy and Willacy Counties. Special Weather Statements are possible
each day across the eastern half of Deep South Texas as heat indices
reach at least 111 F for an hour or two in the afternoon and, or
early evening hours. Heat Advisories may also be issued next week as
moisture and temperatures rise and lead to heat indices of 111 F or
greater for 2 hours or more, especially across the middle and lower
RGV as well as Kenedy and Willacy Counties. Nights will continue to
be muggy and warm with temperatures ranging from the mid to upper
70s across the region and lower 80s along the coast.
&&
.AVIATION...
(12Z TAFS)
Issued at 609 AM CDT Thu Aug 8 2024
VFR conditions are expected to prevail through the TAF period with
generally light southeasterly winds. An easterly sea breeze may be
possible this afternoon with an isolated shower or thunderstorm.
&&
.MARINE...
Issued at 254 AM CDT Thu Aug 8 2024
Now through Friday...High pressure continues across the western Gulf
of Mexico with generally light southeasterly winds expected into mid-
week. Expect favorable marine conditions to continue through the
remainder of the week.
Friday night through Wednesday...A ridge aloft and high pressure at
the surface will result in light to gentle easterly to southerly
winds and calm to slight seas throughout the period. A weak pressure
gradient may result in gentle to moderate winds and choppy
conditions in the Laguna Madre on Monday and Tuesday. There is a
slight chance of isolated showers and thunderstorms on Sunday and
Tuesday as well as a slightly higher chance of isolated to scattered
convection on Monday, which may result in locally enhanced winds and
seas in and near thunderstorms.
&&
.PRELIMINARY POINT TEMPS/POPS...
BROWNSVILLE 100 80 99 78 / 10 0 10 0
HARLINGEN 99 77 99 75 / 10 0 10 0
MCALLEN 104 80 103 78 / 10 10 10 0
RIO GRANDE CITY 103 79 102 76 / 0 0 0 0
SOUTH PADRE ISLAND 91 83 91 82 / 0 0 0 0
BAYVIEW/PORT ISABEL 96 79 93 77 / 0 0 0 0
&&
.BRO WATCHES/WARNINGS/ADVISORIES...
TX...Heat Advisory from 1 PM this afternoon to 6 PM CDT this evening
for TXZ253>255.
GM...None.
&&
SHORT TERM...56-Hallman
LONG TERM....65-Irish
AVIATION...56-HallmanThe national radar mosaic for the moment the first event began.
1 heat. Local standard time, as filed.
Heat index values reached 111 or higher at McAllen/Miller International Airport (KMFE) for several hours. Values occurred between 1130 AM and 130 PM CST, and again from 330 to 5 PM CST. Peak values reached 114 at 1153 AM CST.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2024Every state in 2024This day in weather historyWarnings in Texas, August 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1214284.