|Mesoscale Discussion 891|
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Mesoscale Discussion 0891
NWS Storm Prediction Center Norman OK
1252 AM CDT Sun May 28 2017
Areas affected...southeastern OK / west-central AR
Concerning...Severe Thunderstorm Watch 290...
Valid 280552Z - 280615Z
The severe weather threat for Severe Thunderstorm Watch 290
SUMMARY...An evolution to a small-scale bow echo is seemingly
occurring across southeastern OK. A concentrated swath of 55-70 mph
winds would accompany the bow.
DISCUSSION...Radar data (mosaic and 9-km CAPPI) show a cluster of
storms beginning to evolve into a bow. The Clayton and Talihina OK
mesonet sites measured 49 mph and 50 mph gusts in the past 20
minutes. A very moisture rich airmass(surface dewpoints in the
middle 70s degrees F) ahead of the bow is characterized as very
unstable (3500 J/kg MLCAPE) according to objective analysis. KSRX
and KLZK VAD data show 500-mb flow around 50 kt and this region is
within a belt of southwesterly 40-kt 850-mb flow. The steep lapse
rates and strong deep shear will combine to strongly favor organized
storm structures with severe gusts becoming the primary threat as it
moves into west-central AR.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 34039533 34509487 34919516 34859392 34429334 34059388
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