MD 1061 CONCERNING SEVERE THUNDERSTORM WATCH 339… FOR PORTIONS OF THE MID MISSOURI VALLEY
Mesoscale Discussion 1061 NWS Storm Prediction Center Norman OK 0616 PM CDT Fri Jun 16 2017 Areas affected...Portions of the mid Missouri Valley Concerning...Severe Thunderstorm Watch 339... Valid 162316Z - 170115Z The severe weather threat for Severe Thunderstorm Watch 339 continues. SUMMARY...A line of significant severe thunderstorms will move through the Omaha metro area over the next couple of hours. Damaging wind gusts (a few of which could be 75+ mph), large hail, and tornadoes will remain possible. DISCUSSION...Regional radar data depict a cluster of high-precipitation supercells across eastern Nebraska early this evening. These storms have already produced an array of severe weather, including a gust to 74 mph at Norfolk, NE as a stout mesocyclone passed the site. As of 2300Z, KOAX data exhibited at least two strong rear-flank downdraft surges within this line of embedded supercells. These surges should support a continued upscale growth of these cells into a bowing complex that accelerates rapidly southeast towards Omaha, likely reaching the metro area around 00-01Z (7-8pm CDT). A 21Z OAX observed sounding sampled a thermodynamic profile quite favorable for damaging wind gusts. Moreover, low-level and deep-layer shear suggest very large hail and tornadoes will remain possible in any discrete or embedded supercellular elements. Therefore, all severe hazards remain possible with these storms, and damaging gusts (some of which could be over 75 mph) appear likely in/around the Omaha and Lincoln areas within the next 1-2 hours. Additionally, downstream watch issuance in Iowa/Missouri will likely be needed within the next two hours. ..Picca.. 06/16/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DMX...EAX...FSD...OAX...TOP...GID...LBF... LAT...LON 41389884 42239762 42379620 42269598 42029561 40919430 39719435 39369525 39409672 40029797 40559851 41049892 41169886 41389884
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