Mesoscale Discussion 0760
NWS Storm Prediction Center Norman OK
0302 PM CDT Thu May 18 2017
Areas affected...Portions of western Oklahoma and northwest Texas
Concerning...Tornado Watch 235...
Valid 182002Z - 182130Z
The severe weather threat for Tornado Watch 235 continues.
SUMMARY...Potential for tornadoes likely maximized over northwest
Texas and southwest Oklahoma over the next couple of hours.
DISCUSSION...KFDR radar data indicate several strong supercells
across the discussion area this afternoon, with at least two
tornadoes already reported over southwest Oklahoma. Ahead of these
cells, surface observations indicate pressure falls around 1-1.5
mb/hour, with a notable backing of low-level flow. In turn, any
semi-discrete convection with a deviant eastward component of motion
will exist within an environment characterized by strong low-level
storm-relative flow. Radar data confirm such a regime, as ZDR arc
signatures continue to be noted on these supercells, indicating
vigorous storm-relative flow veering with height. Therefore, cyclic
low-level mesocylogenesis, with occasional tornadogenesis, will
likely continue with these cells as they spread northeast. Very
large hail and damaging winds will also remain a threat.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 34679988 35099980 35549955 35699872 35609808 35419789
34439776 34029796 33569909 33559974 34279992 34679988