|Mesoscale Discussion 1352|
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Mesoscale Discussion 1352
NWS Storm Prediction Center Norman OK
0246 PM CDT Wed Jul 19 2017
Areas affected...Portions of southern MN
Concerning...Severe Thunderstorm Watch 420...
Valid 191946Z - 192115Z
The severe weather threat for Severe Thunderstorm Watch 420
SUMMARY...The severe wind threat will continue within Watch #0420.
DISCUSSION...A small bowing convective system continues to move
across southwestern MN at 40-45 kt. A strong MCV/northern cyclonic
bookend vortex appears to have biased the overall system motion
eastward the last 60-90 minutes, while the southern end of the
system has not propagated into IA likely because of the northern
edge of the strong capping inversion there. The rear inflow
associated with the cyclonic vortex and expanding stratiform
precipitation will continue to organize and expand in size the next
hour or so. As the surging cold pool interacts with a very moist,
unstable boundary layer observed to its east-southeast, intense
convective development is expected to continue, aided by a
deep-layer vertical wind shear profile very favorable for continued
convective regeneration. Given the increasing influence of the
rear-inflow, a general east-southeast motion is expected to resume
in the next hour.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 44409498 44439440 44369344 44249310 44009299 43699302
43439313 43439358 43499402 43539464 43609505 43789528
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