textproduct: Shreveport

KEY MESSAGES

Issued at 133 PM CDT Thu Aug 20 2026

- Showers and thunderstorms will develop and intensify across southern Arkansas and adjacent areas of Oklahoma, northeast Texas and northern Louisiana this evening. Some storms may be capable of producing damaging wind gusts.

- A Heat Advisory will continue areawide overnight and through tomorrow evening for high temperatures near or in excess of 100 degrees with heat indices up to 109 will continue throughout the week ahead. a Heat Advisory remains in effect, with extensions likely.

- Scattered showers and thunderstorms will be possible on a near- daily basis through the remainder of the week ahead.

DISCUSSION

Issued at 133 PM CDT Thu Aug 20 2026

As of this Thursday afternoon writing, the prominent upper level ridging responsible for our heat dome of late has retrograded as scheduled, retreating to the Four Corners Region and releasing the eastern ArkLaTex from its grasp. Over the next several hours, the northwest flow finding its way over the Ozarks and across Arkansas from northwest to southeast will work to swing a boundary in from the north, the catalyst for showers and thunderstorms.

The latest high resolution guidance suggests impacts near and north of the I-30 corridor may begin late this afternoon into the early evening, increasing in coverage and intensity towards sunset and into the later evening hours. As previously advertised, if uplift manages to break the cap, the strong to severe storms which may result look to exhibit significant potential for downbursts producing strong, damaging wind gusts. With the lunchtime update, the SPC has expanded the Marginal Risk (Level 1 of 5) south and west, extending from McCurtain County to just northeast of the Shreveport-Bossier metro, and east to areas south of Monroe. A Slight Risk has been added, which does not include our CWA as of this writing, but is positioned just northeast of Union County, Arkansas.

Today's heat products will continue as scheduled through this evening, followed by an areawide continuation of the Heat Advisory overnight and through Friday evening. Much like at this time yesterday, afternoon dewpoints at our warmest sites still look to fall into the upper 60s to lower 70s by early afternoon, causing heat indices remaining largely within Advisory criteria. Any heat indices of 110 or greater will be isolated and short-lived enough to not merit further upgrading at this time. If this changes in subsequent model runs, a decision will be made with tonight's forecast package. An additional variable in play tomorrow will be continuing chances for showers and storms and associated cloud cover, which may serve to noticeably limit runaway heating.

This evening's surface boundary will push south, but exactly how far it reaches will be a determining factor in how tomorrow unfolds. With the same northwest flow in play, the boundary looks to kick up renewed showers and storms across the southern half of the ArkLaTex tomorrow afternoon and evening. From there, this unsettled pattern continues with scattered showers and storms possible again Saturday, potentially drier conditions Sunday, and further daily rounds of showers and storms into next week. Upper 90s and lower triple digits look to continue throughout, though the presence of continued rainfall and cloud cover may start to make a dent in this prolonged heat wave.

/26/

AVIATION

(00Z TAFS) Issued at 620 PM CDT Thu Aug 20 2026

For the 21/00z TAF update...Watching two areas of convection this evening. The first is moving through southeast Oklahoma and southwest Arkansas, with the second area moving from southeast Arkansas into northeast Louisiana. Have maintained mention of VCTS for KELD, KTXK, and KMLU through around 21/03z and then picked it for the KTYR, KSHV and KGGG from 21/03z till around 21/06z. While I can't rule it out, I don't have enough confidence to mention that any of this convection will directly impact a terminal, but should it, I will update using an AMD. Aside from any brief reduction of flight conditions during any potential storms, VFR conditions will prevail throughout this period. Another area of some lower confidence is in regards to wind, while standard winds should remain below 10kt, once these storms start to send some outflow boundaries, some terminals may become gusty at times. /33/

SPOTTER INFORMATION STATEMENT

Issued at 133 PM CDT Thu Aug 20 2026

Spotter activation may be needed late this afternoon and evening, continuing overnight, for southern Arkansas and adjacent areas of Oklahoma, northeast Texas and northern Louisiana for thunderstorms that may produce damaging wind gusts.

PRELIMINARY POINT TEMPS/POPS

SHV 79 102 77 102 / 30 20 30 10 MLU 76 102 74 102 / 20 20 20 10 DEQ 71 101 70 100 / 40 20 30 30 TXK 76 100 75 101 / 40 10 30 20 ELD 75 101 73 101 / 40 10 10 20 TYR 80 102 79 104 / 20 20 30 10 GGG 79 102 77 105 / 20 20 30 10 LFK 77 102 77 103 / 0 20 30 10

SHV WATCHES/WARNINGS/ADVISORIES

AR...Extreme Heat Warning until 8 PM CDT this evening for ARZ050-051- 059>061-070>072.

Heat Advisory until 9 PM CDT Friday for ARZ050-051-059>061- 070>072.

Heat Advisory until 9 PM CDT Friday for ARZ073.

LA...Heat Advisory until 9 PM CDT Friday for LAZ001>006-010>014- 017>022.

OK...Extreme Heat Warning until 8 PM CDT this evening for OKZ077.

Heat Advisory until 9 PM CDT Friday for OKZ077.

TX...Extreme Heat Warning until 8 PM CDT this evening for TXZ096-097- 108>112.

Heat Advisory until 9 PM CDT Friday for TXZ096-097-108>112.

Heat Advisory until 9 PM CDT Friday for TXZ124>126-136>138- 149>153-165>167.