|Mesoscale Discussion 1383|
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Mesoscale Discussion 1383
NWS Storm Prediction Center Norman OK
0353 PM CDT Fri Jul 21 2017
Areas affected...Portions of northwest MN...southeast ND...north
central and northeast SD
Concerning...Severe Thunderstorm Watch 428...
Valid 212053Z - 212230Z
The severe weather threat for Severe Thunderstorm Watch 428
SUMMARY...The severe weather threat for Watch 428 continues.
DISCUSSION...A threat for severe wind gusts and hail continues in
the Watch area, with the main threat in the short term ahead of the
supercell in Griggs County, ND, which is expected to maintain a
threat for significant hail and wind gusts in the next hour or so.
Convective coverage is increasing rapidly in much of the MN portion
of the Watch under the influence of the approaching short wave
trough. Initial storm development appears as scattered discrete
cells in this area, so a limited tornado threat continues with any
cells that can attain supercell structures, but is mostly confined
to a narrow region between the surface trough and a region of much
drier air over north central MN. Severe wind gusts and hail are also
possible with this activity.
Farther south, the convective inhibition has eroded over most of the
area, and scattered thunderstorms are expected to develop in the
next hour, mainly along a weak surface trough over central SD. An
initial mode of discrete cells is expected that will pose the threat
for severe wind gusts and hail. The tornado threat is much lower in
this portion of the Watch given weak low-level winds/shear and a
more deeply-mixed boundary layer.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 48159887 48159431 44649833 44630254 48159887
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