Mesoscale Discussion 0688
NWS Storm Prediction Center Norman OK
0348 PM CDT Wed May 10 2017
Areas affected...Portions of northeastern MO...southeastern
IA...IL...western IN
Concerning...Severe Thunderstorm Watch 203...
Valid 102048Z - 102215Z
The severe weather threat for Severe Thunderstorm Watch 203
continues.
SUMMARY...The severe risk continues across remaining-valid portions
of Severe Thunderstorm Watch 203 and may spread farther east/south.
Additional Watch issuance and/or Watch extension may be considered.
DISCUSSION...A cluster of thunderstorms has consolidated into a
somewhat more organized squall line from southeast IA to far
north-central MO. This activity will continue advancing generally
eastward along a baroclinic zone, with some tendency for southward
development into a destabilizing environment south of the boundary.
A few storms may also continue to develop ahead of this activity.
With around 45-55 kt of effective shear, this activity will likely
continue to exhibit organization into the early evening hours.
Isolated to widely scattered severe wind/hail will remain possible,
along with some potential for a brief tornado. Downstream Watch
issuance may eventually be considered, and local extensions of Watch
203 may also be considered. Behind the squall line, the severe risk
will markedly diminish.
..Cohen.. 05/10/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...IND...LOT...ILX...LSX...DVN...EAX...
LAT...LON 39769275 40259250 40869147 41148980 40948781 40528707
39908735 39538829 39369091 39769275
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