Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 261038
SWOMCD
SPC MCD 261037
ARZ000-TXZ000-OKZ000-261230-

Mesoscale Discussion 0558
NWS Storm Prediction Center Norman OK
0537 AM CDT Wed Apr 26 2017

Areas affected...Arkansas...Southeast Oklahoma...Northeast Texas

Concerning...Severe Thunderstorm Watch 160...

Valid 261037Z - 261230Z

The severe weather threat for Severe Thunderstorm Watch 160
continues.

SUMMARY...The severe threat is expected to continue across parts of
eastern Oklahoma and northwestern Arkansas this morning. Severe
storms may also develop across parts of northeast Texas. WW issuance
will likely be needed across parts of this region over the next
hour.

DISCUSSION...The latest radar analysis shows a developing line of
storms extending from far northwest Arkansas southwestward to near
the Red River in southern Oklahoma. This line of storms is being
supported by forcing along a cold front and lift associated with the
western edge of belt of strong low-level flow. Ahead of the line of
storms, moisture advection and surface heating this morning will
maintain moderate instability across much of the Arklatex. This
combined with large-scale ascent associated with an upper-level
trough moving into the southern Plains will help the line to
gradually become more organized.

Regional WSR-88D VWPs show 0-6 km shear in the 60 to 75 kt range
with substantial directional shear in the lowest 2 km AGL. This
combined with strong forcing should support squall-line development
over the next few hours. Rotating cells associated with isolated
large hail will be possible within the stronger portions of the
line. Wind damage will also be possible with bowing segments that
develop along the leading edge of the line.

..Broyles/Edwards.. 04/26/2017

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

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

LAT...LON   36089369 34139667 32549771 32359581 33139451 34739288
            35759207 36089369




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