Mesoscale Discussion 0793
NWS Storm Prediction Center Norman OK
0916 PM CDT Fri May 19 2017
Areas affected...portions of southern Missouri...eastern
Oklahoma...and northwest Arkansas
Concerning...Tornado Watch 248...249...
Valid 200216Z - 200315Z
The severe weather threat for Tornado Watch 248, 249 continues.
SUMMARY...Strong/locally severe storms continue moving
east/northeast across ww 248 and 249, with severe/isolated tornado
risk gradually spreading east across the Ozarks region. A new
tornado watch will be required.
DISCUSSION...Latest radar loop shows and broken band of storms --
including embedded rotating updrafts, extending from southwest MO
southwest across eastern Oklahoma along and ahead of an advancing
cold front. Other/more isolated cells are evolving ahead of this
band over portions of the Ozarks. With time, a moderately unstable
airmass downstream of the storms, and south of a west-to-east cold
front sagging south across central Missouri, will support eastward
spread of the convection. Given amply strong flow aloft, expect the
risk for locally damaging winds and some hail, and potential for
isolated/brief tornadoes to accompany stronger updrafts --
warranting issuance of a new watch downstream of the existing storms
to extend into the overnight hours.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 38249134 37119117 36239117 35299202 34309386 34329512
34619569 35029584 35869535 36919460 38279302 38249134