textproduct: Shreveport

KEY MESSAGES

Issued at 115 AM CDT Fri Aug 21 2026

- Oppressive heat will continue again today, with widespread triple digit temperatures and even higher heat indices expected near and south of a stalling surface boundary over portions of Northeast Texas, Southern Arkansas, and North Louisiana. Thus, an Extreme Heat Warning is in effect for much of these areas today. - This boundary and a weakness aloft may again yield isolated to widely scattered showers and thunderstorms this afternoon and evening, some of which may produce damaging downburst winds.

- The oppressive heat will continue this weekend through much of next week, although limited relief from the heat in the form of afternoon showers and thunderstorms will again be possible Saturday and again next week.

DISCUSSION

Issued at 115 AM CDT Fri Aug 21 2026

The early morning sfc analysis indicates a stalled sfc bndry just N of the region, over Ern OK, Wrn and Cntrl AR. This bndry was the focus for more pronounced scattered convection Thursday afternoon and evening, much of which has finally diminished as the air mass has finally stabilized. However, remnant convective bndrys from the earlier convection have spread SW through much of Srn AR into Ern McCurtain County OK and Bowie/Cass Counties in NE TX, where greater heat and instability still resides, and have sparked additional isolated convection development. This should be short- lived though as the air mass continues to stabilize overnight, although additional isolated convection over Ern OK may spill SE along elevated theta-e forcing, possibly affecting the NW zones prior to daybreak before diminishing.

The aforementioned sfc bndry remains progged to drift S later today, setting up somewhere over extreme NE TX/Srn AR/N LA in a NW to SE oriented position, and could again play a role in compressional warming this afternoon as well as some limited bndry lyr moisture pooling. Even adjusting the higher NBM dewpoints down 2-3 degrees to reflect some mixing that should take place given the very dry grounds in place with the ongoing flash drought, max temps in the triple digits should yield heat indices at or above 110 degrees this afternoon over much of N LA/extreme SCntrl AR/much of E TX along/S of I-20. Thus, have upgraded the existing Heat Advisory to an Extreme Heat Warning for these areas through 02Z this evening, although will again allow the day shift to re-evaluate and extend the appropriate heat products forward into Saturday as the oppressive heat will continue. What's left of our sfc bndry tonight will either wash out or be nudged S of the area Saturday, which may allow for slightly better mixing of dewpoints and thus, slightly lower heat indices.

This bndry should also serve as focus for isolated to widely scattered elevated convection by mid and late afternoon, especially along/S of the I-20 corridor. Have maintained low chance pops for this area, although isolated convection will be possible farther N by late afternoon through the evening as another weakness aloft should slide SSE around the Ern periphery of the expanding upper ridge in place over the Four Corners Region E into the Srn Plains. As was the case Thursday afternoon, isolated strong to severe storms capable of producing damaging downburst winds will be possible, and while this threat should diminish by mid to late evening, additional scattered convection may develop/spill SE overnight across SE OK/NE TX/SW AR ahead of another weakness aloft set to spill SE. While the jury is still out amongst the various models as to how much convection coverage will linger into Saturday, reinforcing outflow bndrys may yield slightly lower dewpoints Saturday, and elevated cigs may help to taper back temps slightly as well. Confidence is not high enough though to increase pops much above low chance over E TX, but there is the potential for some relief to the heat in the form of at least isolated afternoon convection.

The upper ridge center out W remains progged to begin expanding E into the Srn Plains Sunday, with increased subsidence resulting in mostly dry conditions areawide, with widespread triple digit temps again expected. Another weakness aloft in the form of weak shortwave energy is progged to traverse Cntrl/Ern AR into NCntrl MS Sunday night/Monday morning, which may focus more organized convection over these areas, mostly bypassing our region once again aside from the far Ern zones. Very hot and dry conditions look to persist through midweek, before the ridging begins to slowly retrograde back W into the Desert SW for mid and late week, which should allow for weaknesses in the NW flow regime to focus more in the way of isolated to scattered convection over the region through late week. This should also help to slightly lower max temps below the century mark, providing at least some glimmer of hope to the oppressive heat with perhaps, some wetting rains for some, mainly across portions of Srn AR and N LA where influence from the retreating ridge will be weakest.

15

AVIATION

(12Z TAFS) Issued at 614 AM CDT Fri Aug 21 2026

VFR conditions expected through the period ending 22/12Z. VCTS conditions possible across most terminals this afternoon into the evening hours with conditions improving by 22/04Z. Light south winds to prevail this morning. However, a weak frontal boundary expected to bring a windshift to the northwest for TXK/ELD/MLU/SHV after 21/18Z with winds becoming light and variable areawide after 22/00Z. /05/

SPOTTER INFORMATION STATEMENT

Issued at 115 AM CDT Fri Aug 21 2026

Spotter activation may be need this afternoon and evening over portions of East Texas and North Louisiana for thunderstorms that may produce damaging downburst winds. /15/

PRELIMINARY POINT TEMPS/POPS

SHV 103 78 101 76 / 20 20 20 10 MLU 103 75 102 75 / 20 20 20 10 DEQ 104 73 100 72 / 20 40 20 20 TXK 104 76 100 74 / 20 40 20 20 ELD 104 73 101 73 / 20 20 20 20 TYR 104 77 104 78 / 20 20 20 10 GGG 104 77 104 76 / 20 20 30 10 LFK 103 76 102 76 / 30 30 20 10

SHV WATCHES/WARNINGS/ADVISORIES

AR...Heat Advisory until 9 PM CDT this evening for ARZ050-051-059>061- 070-071.

Extreme Heat Warning from 10 AM this morning to 9 PM CDT this evening for ARZ072-073.

LA...Extreme Heat Warning from 10 AM this morning to 9 PM CDT this evening for LAZ001>006-010>014-017>022.

OK...Heat Advisory until 9 PM CDT this evening for OKZ077.

TX...Heat Advisory until 9 PM CDT this evening for TXZ096-097-108>112.

Extreme Heat Warning from 10 AM this morning to 9 PM CDT this evening for TXZ124>126-136>138-149>153-165>167.