Mesoscale Discussion 0440 NWS Storm Prediction Center Norman OK 0253 PM CDT Wed Apr 22 2020 Areas affected...east-central Texas and west-central Louisiana Concerning...Tornado Watch 133... Valid 221953Z - 222100Z The severe weather threat for Tornado Watch 133 continues. SUMMARY...Convective trends suggest a recent uptick in intensity over the past half hour, with rotation noted in several cells. All modes of severe weather remain possible with this activity. DISCUSSION...Storms across north/northeastern portions of WW 133 have increased in intensity over the past half hour or so - and are now exhibiting more supercellular characteristics. A subtle warm front/differential heating zone has developed along an east-west axis in vicinity of these storms - generally from near Tyler, TX to near Fort Polk, Louisiana. South of this effective boundary, continued low-level advection and limited insolation has maintained a moderately unstable airmass, which is likely allowing for storms to become more surface-based and ingest vorticity along the weak differential heating zone. This suggests an increase in the tornado and hail threat with this convection. Again, a strong tornado cannot be completely ruled out given 500+ m2/s2 effective SRH near the differential heating zone. As storms migrate northeast, spatial extensions of WW 133 may be needed. ..Cook.. 04/22/2020 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...JAN...LCH...SHV...HGX...FWD... LAT...LON 32579342 32479421 32199528 31819579 31299576 30989517 31049433 31069326 31149228 31439199 31949217 32299269 32579342