MD 1571 CONCERNING TORNADO WATCH 465… FOR UPPER TEXAS COAST
Mesoscale Discussion 1571 NWS Storm Prediction Center Norman OK 0117 AM CDT Sat Aug 26 2017 Areas affected...Upper Texas Coast Concerning...Tornado Watch 465... Valid 260617Z - 260645Z The severe weather threat for Tornado Watch 465 continues. SUMMARY...The highest potential for tornadic supercells will likely be within 2 corridors either side of Galveston Bay (Brazoria/Fort Bend and Chambers Counties) for the next 1-2 hours. A new tornado watch will be issued before 0700 UTC. DISCUSSION...Latest subjective surface mesoanalysis indicates the 80 degree F isotherm encompasses Brazoria county northeast into Chambers county. The northwest area of a plume of 78 degree F dewpoints protrudes northwest from the northwest Gulf of Mexico into the immediate coastal area of Brazoria county. The latest RAP forecast sounding appears to be representative of the surface and around 1400 J/kg MLCAPE is noted. When inputting storm motion (135 degrees at 35-kt), the KHGX VAD indicates around 200 m2/s2 0-1 km SRH. With robust updrafts implied by the convective structures (echo tops 35-40k ft), the environment will continue to be favorable for low-level mesocyclones and a tornado risk over the next 1-2 hours. ..Smith.. 08/26/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LCH...HGX... LAT...LON 28929522 29379547 29869426 29459397 28929522
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