SPC MD 1484

By Newsroom America Feeds at 12 Aug 2017

MD 1484 CONCERNING SEVERE THUNDERSTORM WATCH 449... FOR PARTS OF SOUTHERN SOUTH DAKOTA/WESTERN NEBRASKA/NORTHEAST COLORADO/NORTHWEST KANSAS
Mesoscale Discussion 1484 NWS Storm Prediction Center Norman OK 0616 PM CDT Sat Aug 12 2017 Areas affected...Parts of southern South Dakota/western Nebraska/northeast Colorado/northwest Kansas Concerning...Severe Thunderstorm Watch 449... Valid 122316Z - 130045Z The severe weather threat for Severe Thunderstorm Watch 449 continues. SUMMARY...Risk for severe hail and wind will continue in stronger storms across the region well into the evening hours. It currently appears unlikely that another watch will be needed, but trends will continue to be monitored. DISCUSSION...Scattered strong to severe thunderstorm development is well underway in the presence of moderately large CAPE and deep layer shear near the lee surface trough across the high Plains. Despite the seasonably strong shear (largely due to pronounced veering of winds with height,) westerly/northwesterly deep layer mean flow appears rather modest, at or below 25 kt. This is resulting in generally slow storm motions, and little, if any, east/southeastward advection of this unstable environment is expected prior to the onset of nocturnal boundary layer cooling and destabilization. So little change to the corridor of stronger storm development is expected, but this environment probably will remain conducive to the risk for storms capable of producing severe hail and at least localized strong surface gusts well into the evening hours. ..Kerr.. 08/12/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...FSD...ABR...GID...LBF...UNR...GLD...BOU...CYS... LAT...LON 43529943 42849916 40859962 38840154 38810281 40130359 41290371 42420365 43060313 43540252 43790169 43800046 43529943 Read more

http://www.spc.noaa.gov/products/md/md1484.html

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