textproduct: Shreveport

DISCUSSION

Issued at 1205 AM CDT Tue Jul 21 2026

The hottest day of the Summer was felt across most of our area on Monday with afternoon temperatures in the upper 90s to lower 100s and heat indices ranging from the upper 110s to near 105 across the entire Four State Region. Unfortunately there are at least a couple more days of this kind of oppressive heat before a weak cold front backdoors its way into our region late Wednesday into Thursday helping to offset temperatures slightly.

Upper ridging will continue building into our region from the northwest Today through the end of the upcoming work week and this will keep toasty temperatures in place through the short term. Given the fact that we are struggling to see afternoon dewpoints mix down enough to go with this increasing near triple digit ambient heat, heat indices will exceed 110 degrees by late morning, through the afternoon and into the early evening Today across our far northern and eastern zones. For this reason, have upgraded the Heat Advisory to a Extreme Heat Warning near and northeast of a line from Clarksville and Texarkana Texas to Magnolia Arkansas, to Homer, Ruston, and Colfax, Louisiana. Elsewhere, the Heat Advisory remains in place through 8 pm this evening as dewpoints may mix down just enough to keep maximum afternoon heat indices just under 110 degrees. Cannot rule out at least some isolated convection late this afternoon into the evening across our eastern third as PWATS are sufficient enough to go along with diurnal heating to produce isolated convection, similar to what we saw today.

A longwave trough across the Upper Midwest into the Great Lakes and New England on Wednesday will drag a cold front down with it into the Mid Miss and Tenn Valleys. This boundary will begin moving into our region late in the day Wednesday and with compressional warming along and in advance of the backdooring cool front, the I-20 Corridor will likely see its hottest temperatures Wed afternoon with triple digit heat likely along and south of the corridor. Could see isolated convection across our eastern half once again on Wed and into the evening hours across our far northeast zones behind the frontal boundary with increased forcing in association with the southwest flanking upper trough axis.

Temperatures on Thursday appear to be a tad cooler across most areas in the wake of the backdoor front. This in combination with perhaps east to northeasterly winds north of a weakening Bertha near or just offshore the S LA Coast may also help to offset temperatures just a bit. Progs are still very dry across our southern third even with our region in such close proximity to a weakening Bertha and this is due in part to dry air entrainment and moderate to strong shear into the north and northeast quadrant of the storm. This not only should hamper any more additional development to Bertha but will also restrict rain chances north of the center of circulation as well.

For the upcoming weekend, can't rule out at least isolated convection across our far northern and eastern zones as additional forcing from yet another weak shortwave moving out of the Ouachitas and into the Lower Miss Valley may generate at least slight chance to low end chance pops across these areas. Otherwise, the upper level ridge axis begins expanding once again across our region and that means a warming trend once again into next week. Would not be surprised to see at least the western half of our region approach triple digit heat once again as early as Sunday and more areawide by Monday into Tuesday of next week.

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DISCUSSION

Issued at 1205 AM CDT Tue Jul 21 2026

The hottest day of the Summer was felt across most of our area on Monday with afternoon temperatures in the upper 90s to lower 100s and heat indices ranging from the upper 110s to near 105 across the entire Four State Region. Unfortunately there are at least a couple more days of this kind of oppressive heat before a weak cold front backdoors its way into our region late Wednesday into Thursday helping to offset temperatures slightly.

Upper ridging will continue building into our region from the northwest Today through the end of the upcoming work week and this will keep toasty temperatures in place through the short term. Given the fact that we are struggling to see afternoon dewpoints mix down enough to go with this increasing near triple digit ambient heat, heat indices will exceed 110 degrees by late morning, through the afternoon and into the early evening Today across our far northern and eastern zones. For this reason, have upgraded the Heat Advisory to a Extreme Heat Warning near and northeast of a line from Clarksville and Texarkana Texas to Magnolia Arkansas, to Homer, Ruston, and Colfax, Louisiana. Elsewhere, the Heat Advisory remains in place through 8 pm this evening as dewpoints may mix down just enough to keep maximum afternoon heat indices just under 110 degrees. Cannot rule out at least some isolated convection late this afternoon into the evening across our eastern third as PWATS are sufficient enough to go along with diurnal heating to produce isolated convection, similar to what we saw today.

A longwave trough across the Upper Midwest into the Great Lakes and New England on Wednesday will drag a cold front down with it into the Mid Miss and Tenn Valleys. This boundary will begin moving into our region late in the day Wednesday and with compressional warming along and in advance of the backdooring cool front, the I-20 Corridor will likely see its hottest temperatures Wed afternoon with triple digit heat likely along and south of the corridor. Could see isolated convection across our eastern half once again on Wed and into the evening hours across our far northeast zones behind the frontal boundary with increased forcing in association with the southwest flanking upper trough axis.

Temperatures on Thursday appear to be a tad cooler across most areas in the wake of the backdoor front. This in combination with perhaps east to northeasterly winds north of a weakening Bertha near or just offshore the S LA Coast may also help to offset temperatures just a bit. Progs are still very dry across our southern third even with our region in such close proximity to a weakening Bertha and this is due in part to dry air entrainment and moderate to strong shear into the north and northeast quadrant of the storm. This not only should hamper any more additional development to Bertha but will also restrict rain chances north of the center of circulation as well.

For the upcoming weekend, can't rule out at least isolated convection across our far northern and eastern zones as additional forcing from yet another weak shortwave moving out of the Ouachitas and into the Lower Miss Valley may generate at least slight chance to low end chance pops across these areas. Otherwise, the upper level ridge axis begins expanding once again across our region and that means a warming trend once again into next week. Would not be surprised to see at least the western half of our region approach triple digit heat once again as early as Sunday and more areawide by Monday into Tuesday of next week.

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AVIATION

(06Z TAFS) Issued at 1221 AM CDT Tue Jul 21 2026

For the 21/06Z TAFs, VFR conditions look to prevail throughout the period, with mostly clear skies overnight punctuated only by scattered high clouds. More cloud development is expected by daybreak, but CIGs should remain elevated, with the lowest drops to only lower VFR. Winds overnight will remain light and variable, becoming northwest to northerly at speeds of about 5 kts during the daylight hours before dropping off again after sunset.

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SPOTTER INFORMATION STATEMENT

Issued at 1205 AM CDT Tue Jul 21 2026

Spotter activation is not expected through tonight.

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PRELIMINARY POINT TEMPS/POPS

SHV 98 82 100 77 / 10 10 0 0 MLU 101 81 99 76 / 20 20 0 0 DEQ 100 78 97 73 / 10 10 0 0 TXK 101 80 99 75 / 10 10 0 0 ELD 98 78 97 73 / 20 20 0 0 TYR 100 82 102 78 / 0 0 0 0 GGG 100 82 102 77 / 0 0 0 0 LFK 98 80 102 79 / 0 0 0 0

SHV WATCHES/WARNINGS/ADVISORIES

AR...Extreme Heat Warning from 10 AM this morning to 8 PM CDT this evening for ARZ050-051-059>061-070>073.

LA...Extreme Heat Warning from 10 AM this morning to 8 PM CDT this evening for LAZ004>006-013-014-019>022.

Heat Advisory until 8 PM CDT this evening for LAZ001>003-010>012- 017-018.

OK...Extreme Heat Warning from 10 AM this morning to 8 PM CDT this evening for OKZ077.

TX...Extreme Heat Warning from 10 AM this morning to 8 PM CDT this evening for TXZ096-097.

Heat Advisory until 8 PM CDT this evening for TXZ108>112-124>126- 136>138-149>153-165>167.