SPC MD 1447



MD 1447 CONCERNING SEVERE THUNDERSTORM WATCH 424… FOR NORTHEAST/EAST-CENTRAL NE…NORTHWEST/WEST-CENTRAL IA…FAR SOUTHEAST SD

MD 1447 Image


Mesoscale Discussion 1447
NWS Storm Prediction Center Norman OK
0746 AM CDT Mon Aug 10 2020

Areas affected...Northeast/East-Central NE...Northwest/West-Central
IA...Far Southeast SD

Concerning...Severe Thunderstorm Watch 424...

Valid 101246Z - 101415Z

The severe weather threat for Severe Thunderstorm Watch 424
continues.

SUMMARY...Threat for isolated hail and damaging wind gusts
continues. A watch extension may be needed if more southerly storm
motion continues and additional strengthening occurs.

DISCUSSION...Recent KFSD radar imagery shows the outflow outrunning
the northern portion of the line in far southeast SD and adjacent
far northeast NE. Additionally, the southern portion of the cluster
has a more multicellular structure consistent with warm-air
advection over a boundary, suggesting little organization in this
area of the line as well. In between (roughly over Cedar, Wayne, and
Dixon Counties in NE) some better organization and faster forward
storm motion has been noted. While likely still slightly elevated,
this portion of the line currently poses the highest potential to
produce damaging wind gusts. Recent storm motion of 45 kt takes this
portion of the line to the NE/IA border around 13Z. Additionally, if
the current motion continues, the line could reach the southern edge
of Severe Thunderstorm Watch 424 by 13-1330Z. As a result, a local
extension may be required if trends merit.

..Mosier.. 08/10/2020

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

ATTN...WFO...DMX...FSD...OAX...

LAT...LON   42859747 42959630 42579512 41799552 41969759 42859747 

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