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ACUS11 KWNS 172318
SWOMCD
SPC MCD 172317
KYZ000-INZ000-ILZ000-MOZ000-180045-
Mesoscale Discussion 1510
NWS Storm Prediction Center Norman OK
0617 PM CDT Wed Jul 17 2019
Areas affected...Eastern Missouri and southwest Illinois
Concerning...Severe Thunderstorm Watch 520...
Valid 172317Z - 180045Z
The severe weather threat for Severe Thunderstorm Watch 520
continues.
SUMMARY...The severe weather threat continues through the evening
with primarily a damaging wind threat.
DISCUSSION...The bow echo which has been moving along the
Mississippi River through the evening has become less organized in
the last hour as it moves south of the better mid-level flow and
becomes more outflow dominant. However, the severe weather threat is
expected to continue downstream through the evening due to cell
mergers and additional development along colliding boundaries. Steep
lapse rates in the lower troposphere will support downward parcel
acceleration and a damaging wind threat through 01-02Z before
boundary layer stabilization and convective overturning likely
brings and end to the severe threat.
Areas south and west of the current watch, where convection has been
back building in southeast Missouri are being monitored for a
potential watch extension.
..Bentley.. 07/17/2019
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...PAH...ILX...LSX...
LAT...LON 39338953 39358918 39078877 38538822 37818793 37338789
37078836 36918893 36968959 37299009 37759072 38429110
38959159 38919106 38839073 38819037 39029004 39198978
39338953
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