MD 2130 CONCERNING SEVERE THUNDERSTORM WATCH 679… FOR PORTIONS OF EASTERN WYOMING…EXTREME SOUTHWESTERN SOUTH DAKOTA…EXTREME NORTHWESTERN NEBRASKA
Mesoscale Discussion 2130
NWS Storm Prediction Center Norman OK
0849 PM CDT Sat Sep 09 2023
Areas affected…Portions of eastern Wyoming…extreme southwestern
South Dakota…extreme northwestern Nebraska
Concerning…Severe Thunderstorm Watch 679…
Valid 100149Z – 100245Z
The severe weather threat for Severe Thunderstorm Watch 679
continues.
SUMMARY…The severe threat continues across Severe Thunderstorm
Watch 679. Large hail is the main threat with the stronger storms.
DISCUSSION…Multiple supercell thunderstorms are persisting across
eastern WY, with MRMS MESH indicating severe hail occurring with
multiple storms (perhaps exceeding 2 inches in diameter with the
storm in northern Platte County). Though boundary-layer decoupling
is in progress, strong vertical shear, steep mid-level lapse rates,
and associated residual CAPE atop the boundary layer will support a
continued severe hail threat for at least a few more hours.
..Squitieri.. 09/10/2023
…Please see www.spc.noaa.gov for graphic product…
ATTN…WFO…UNR…CYS…BYZ…RIW…
LAT…LON 41750497 43040618 44190623 44900597 45000517 44840451
44430411 43800380 43000365 42030371 41750497
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