MD 1228 CONCERNING SEVERE THUNDERSTORM WATCH 394… FOR SOUTHEAST OK…FAR NE TEXAS…WESTERN AND CENTRAL AR
Mesoscale Discussion 1228 NWS Storm Prediction Center Norman OK 1251 AM CDT Tue Jul 04 2017 Areas affected...Southeast OK...Far NE Texas...Western and Central AR Concerning...Severe Thunderstorm Watch 394... Valid 040551Z - 040745Z The severe weather threat for Severe Thunderstorm Watch 394 continues. SUMMARY...An isolated wind damage threat is expected to decrease over the next couple of hours as a convective line moves eastward into western Arkansas. Weather watch issuance should not be needed to the east of WW 394. DISCUSSION...The latest radar imagery shows a linear MCS moving through eastern Oklahoma. Although satellite shows warming tops with the linear MCS, the convective line is being supported by a southern Plains shortwave trough evident on water-vapor imagery. Surface analysis shows a moist airmass ahead of the line with surface dewpoints in the lower to mid 70s F. This is resulting in moderate instability across far eastern Oklahoma and western Arkansas. This should enable the line to remain intact over the next couple of hours. However, the WSR-88D VWPs at Fort Smith, AR and Little Rock, AR suggest that deep-layer shear weakens with eastward extent. This along with dropping surface temperatures should result in a gradual weakening of the MCS over the next hour or two. ..Broyles/Edwards.. 07/04/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LZK...SHV...TSA...FWD...OUN... LAT...LON 36109525 35459539 34889575 34389642 33939649 33449544 33269450 33469327 33899254 34699233 35689249 35989389 36109525
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