A second period of temperatures reaching warning criteria began on July 31 and continued into August. Excessive Heat Warnings are issued for maximum heat index values of 113F or above or maximum temperatures of 105 or above.
Every event with a place to put it; 12 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 HGX wrote it up.
A second period of temperatures reaching warning criteria began on July 31 and continued into August. Excessive Heat Warnings are issued for maximum heat index values of 113F or above or maximum temperatures of 105 or above.
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 Houston/Galveston, TX wrote its last area forecast discussion before the first event at Jul 31, 2:15 AM CST, 2 minutes earlier.
Area Forecast Discussion
National Weather Service Houston/Galveston TX
315 AM CDT Mon Jul 31 2023
...New SHORT TERM, LONG TERM, MARINE...
.SHORT TERM...
(Today through Tuesday Night)
Issued at 258 AM CDT Mon Jul 31 2023
With the strong mid/upper level ridge building back into the area,
look for widespread inland high temperatures in the triple digits
with some well inland locations (generally north of I-10 and west of
the Highway 59/69 corridor) possibly approaching 105 degrees today
and again tomorrow. Locations along the immediate coast will
continue to see highs in the low to mid 90s. Afternoon mixing will
allow dew points to fall into the 60s across inland areas, and this
will keep highest heat index values mainly in a 108-112 degree
range. With highs up north getting close to 105, will go ahead and
issue an Excessive Heat Warning for today. The Heat Advisory remains
in effect for the rest of the area today, and for the entire area on
Tuesday. Inland overnight lows will continue to hover in the upper
70s to around 80, with low 80s expected along the coast. As for rain
chances, we will need to monitor a southward moving remnant MCV and
possible outflow boundaries that could generate mainly late
afternoon through evening storms for parts of our northern and
eastern counties.
Heat safety precautions remain critical. Taking protective actions
such as remaining hydrated and avoiding strenuous activity during
the hottest parts of the day can be life-saving! Heat is the number
one weather-related cause of death across the U.S. each year. 42
&&
.LONG TERM...
(Wednesday through Sunday)
Issued at 258 AM CDT Mon Jul 31 2023
With the aforementioned strong midlevel ridge remaining generally
in place for at least the rest of the week, the main story for SE
TX should continue to surround the potential for excessive heat.
By Wednesday, the center of the ridge axis will remain nearly
overhead, as maximum H500 values continue to reach around 598 dam.
With 850mb temperatures concurrently reaching around 23 degC,
another day with widespread temperatures in the triple digits can
be expected while the presence of the ridge also works to stifle
any mentionable chances of diurnal convection. Highs may approach
as high as 105 in some locations, which may necessitate another
Excessive Heat Warning. However, with dew points mixing out into
the 60s during the afternoon hours, maximum heat index values will
remain around 108-110. Overnight lows should continue to hover
just under 80 inland and in the low 80s along the immediate coast.
A gradual westward retreat of the prevailing ridge will occur
through the remainder of the week and into the weekend. While
widespread triple digit highs and heat index values of 110 remain
in the forecast for the foreseeable future, temperatures should
ever so gradually fall as we approach the weekend. Additionally,
this should open up the potential for some diurnally driven
thunderstorms during the afternoon hours as the sea breeze
advances inland, although coverage appears at the current moment
to remain scattered at best and confined to locations south of the
I-10 corridor. All in all, it will still remain quite hot and Heat
Advisories at a minimum should be needed at least through the
duration of the long term period as things currently stand.
Not much relief appears to be in sight as the Climate Prediction
Center continues to favor above normal temperatures across the
area well into August in its latest outlook.
Cady
&&
.AVIATION...
(06Z TAF Issuance)
Issued at 1059 PM CDT Sun Jul 30 2023
Rinse and repeat. VFR conditions will prevail with south to
southeasterly winds between 5 and 10kts. Isolated afternoon
thunderstorm possible along the coast.
Fowler
&&
.MARINE...
Issued at 258 AM CDT Mon Jul 31 2023
Light to moderate onshore winds and 1-3 foot seas will persist for
the foreseeable future. Rainfall chances will remain minimal
through mid-week, after which chances will gradually increase with
scattered storms expected to develop during the morning and
afternoon hours each day. Wind speeds do not look to approach
caution thresholds throughout the week.
Cady
&&
.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL) 104 78 105 78 / 0 0 0 0
Houston (IAH) 103 80 104 80 / 0 0 10 0
Galveston (GLS) 92 82 92 82 / 0 0 10 0
&&
.HGX WATCHES/WARNINGS/ADVISORIES...
TX...Excessive Heat Warning until 9 PM CDT this evening for TXZ163-
164-176>179-195>198.
Heat Advisory from 9 PM this evening to 9 PM CDT Tuesday for
TXZ163-164-176>179-195>198.
Heat Advisory until 9 PM CDT Tuesday for TXZ199-200-210>214-226-
227-235>238-300-313-335>338-436>439.
GM...None.
&&
SHORT TERM...42
LONG TERM....Cady
AVIATION...Fowler
MARINE...CadyThe national radar mosaic for the moment the first event began.
12 excessive heat. Local standard time, as filed.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
Period of extremely hot weather, within a long period of at least Heat Advisory conditions. In StormData periods of conditions reaching Excessive Heat Warning levels are recorded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2023Every state in 2023This day in weather historyWarnings in Texas, July 2023
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: 1127195, 1127197, 1127198, 1127199, 1127200, 1127201, 1127202, 1127203, 1127204, 1127206, 1127207, 1127208.