Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 190020
SWOMCD
SPC MCD 190019
OKZ000-KSZ000-190045-

Mesoscale Discussion 0769
NWS Storm Prediction Center Norman OK
0719 PM CDT Thu May 18 2017

Areas affected...northwest and north-central OK

Concerning...Tornado Watch 235...

Valid 190019Z - 190045Z

The severe weather threat for Tornado Watch 235 continues.

SUMMARY...Large hail and severe gusts will become the main threats
with storms over northern OK this evening.

DISCUSSION...Radar mosaic shows several strong/severe thunderstorms
across northwestern OK and farther east near I-35 in north-central
OK.  OK mesonet surface observations show considerable cooling of
the boundary layer has occurred due to widespread convection.
Surface temperatures are near 70 degrees F and dewpoints in the
lower to middle 60s.  As a result, moderate buoyancy still resides
across the discussion area despite lessening boundary layer
instability.  While a tornado is possible over the next 30 minutes,
it appears the primary severe hazards will continue to transition to
hail (possibly wind-driven) and severe gusts with the stronger
storms.

..Smith.. 05/19/2017

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...ICT...OUN...DDC...

LAT...LON   36189757 36089960 37069862 36909735 36389728 36189757




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