SPC MD 1430



MD 1430 CONCERNING SEVERE THUNDERSTORM WATCH 422… FOR SOUTHEAST SD…FAR NORTHEAST NE…FAR SOUTHWEST MN…FAR NORTHWEST IA

MD 1430 Image


Mesoscale Discussion 1430
NWS Storm Prediction Center Norman OK
0146 AM CDT Sun Aug 09 2020

Areas affected...Southeast SD...Far Northeast NE...Far Southwest
MN...Far Northwest IA

Concerning...Severe Thunderstorm Watch 422...

Valid 090646Z - 090745Z

The severe weather threat for Severe Thunderstorm Watch 422
continues.

SUMMARY...Threat for strong wind gusts will continue across
southeast SD and far northeast NE, and into far southwest MN and far
northwest IA over the next hour or so.

DISCUSSION...Organized convective line continues to move
northeastward across southeast SD and adjacent far northeast NE.
Recent storm motion was estimated at 45-47 kt, bringing the line to
the SD/MN/IA border intersection a little after 07Z. Echo tops have
remained fairly consistent over the past hour or so, with the
strongest cores currently arcing from Hutchinson County SD to Boone
County NE. Near-severe gusts of 49 kt and 41 kt were recently
measured at KHON and KYKN, respectively. 

Low-level stability exists downstream, but the organized character
of the convective line (evidenced by the well-defined rear-inflow
jet on radar imagery) and steep mid-level lapse suggest the line
should maintain its intensity for at least the next hour or so. As a
result, the severe wind threat is expected to persist into far
southwest MN and far northwest IA.

..Mosier.. 08/09/2020

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

ATTN...WFO...MPX...FSD...OAX...ABR...LBF...

LAT...LON   44349979 44739849 44719585 43149556 41959787 43279878
            44349979 

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