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Severe Storm Outlook Narrative (AC)
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Issued by NWS
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000 ACUS11 KWNS 191946 SWOMCD SPC MCD 191945 TXZ000-192045- Mesoscale Discussion 0783 NWS Storm Prediction Center Norman OK 0245 PM CDT Fri May 19 2017 Areas affected...Big Country of TX Concerning...Tornado Watch 246... Valid 191945Z - 192045Z The severe weather threat for Tornado Watch 246 continues. SUMMARY...Tornado threat continues across WW246. DISCUSSION...Boundary-layer has been slow to warm across much of north-central TX this afternoon, though strong sunshine has contributed to significant heating across southwest TX into the TX south plains where sfc-3km lapse rates now exceed 9 C/km. Earlier outflow boundary that approached Tarrant County has stalled and currently extends across Grayson-Denton-Jack Counties. Thunderstorms have concentrated north of this boundary aided in large part to low-level warm advection. However, isolated supercells continue to generate south of the boundary across WW246 along the eastern edge of steeper lapse rate plume where CINH is relatively weak. Latest visible satellite imagery suggests additional thunderstorm activity will soon evolve as towering cu currently extends as far south as eastern Crockett County. ..Darrow.. 05/19/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...FWD...SJT...MAF... LAT...LON 31100121 32860094 32879888 31099915 31100121
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