Severe Storm Outlook Narrative (AC)
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409
ACUS11 KWNS 211446
SWOMCD
SPC MCD 211445
ARZ000-OKZ000-211645-

Mesoscale Discussion 0535
NWS Storm Prediction Center Norman OK
0945 AM CDT Fri Apr 21 2017

Areas affected...Central into southeast OK

Concerning...Severe Thunderstorm Watch 153...

Valid 211445Z - 211645Z

The severe weather threat for Severe Thunderstorm Watch 153
continues.

SUMMARY...Damaging wind threat will spread east-southeastward
through the morning ahead of fast moving convective system. Watch
issuance downstream is imminent.

DISCUSSION...At 1445Z, a fast-moving line was moving
east-southeastward across central OK. Measured wind gusts of 60-70
MPH have recently been observed in conjunction with this line. While
the area being affected is primarily north of the warm front, a
strong pressure rise/fall couplet (noted in OK mesonet data)
associated with the convective system will help to maintain its
intensity and support the continued potential for severe wind gusts
through the rest of the morning.

Some uncertainty remains regarding the southward extent of the
threat in the short-term, but as the outflow approaches areas near
and south of the warm front across southern OK and western AR, some
wind threat may evolve in those areas, in addition to the threat
further north. Given the well-organized nature of the system, a new
watch will be required downstream into southeast OK and western AR.

..Dean/Goss.. 04/21/2017

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

ATTN...WFO...LZK...SHV...TSA...OUN...

LAT...LON   34779788 35259740 35579705 36069660 36269559 35999265
            33819326 33879431 34059537 34189650 34359771 34389782
            34539822 34779788




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