Mesoscale Discussion 1578
NWS Storm Prediction Center Norman OK
0559 PM CDT Sun Aug 22 2021
Areas affected...Eastern Dakotas
Concerning...Severe Thunderstorm Watch 455...
Valid 222259Z - 230030Z
The severe weather threat for Severe Thunderstorm Watch 455
SUMMARY...Severe threat will gradually shift east across ww455.
DISCUSSION...Well-defined short-wave trough is ejecting across the
Dakotas this evening. Scattered severe thunderstorms have developed
ahead of this feature, within a narrow instability axis. This
activity is propagating east at roughly 35kt and should advance east
of the higher buoyancy within the next few hours as the short-wave
progresses downstream. However, latest satellite imagery suggests
deepening updrafts west of Jamestown and this activity may mature
into strong/severe thunderstorms before encountering less-buoyant
air mass over eastern ND. Activity may remain more discrete over SD
along southern fringe of short-wave influence, but storms should
move a bit slower and linger across this portion of the watch.
= = =
To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at firstname.lastname@example.org and ask to be removed from WX-STORM. ------------=_1629673189-87341-1424--