Mesoscale Discussion 1334
NWS Storm Prediction Center Norman OK
0728 PM CDT Fri Jul 24 2020
Areas affected...Southern and Eastern North Dakota...Central South
Dakota...North-central Nebraska
Concerning...Severe Thunderstorm Watch 399...400...
Valid 250028Z - 250230Z
The severe weather threat for Severe Thunderstorm Watch 399, 400
continues.
SUMMARY...A severe threat will likely continue across parts of WW
399 and WW 400. Hail and wind damage will be the primary threats.
DISCUSSION...The latest mosaic radar imagery shows two areas of
strong to severe convection. The first is located from north-central
South Dakota into east-central North Dakota. The storms are located
along a gradient of strong instability. This activity will move
northeastward along the instability gradient into northeastern North
Dakota later this evening. The second area of thunderstorms is
located from southern South Dakota into north-central Nebraska. This
southern area of convection is also located along a gradient of
strong instability. This activity is expected to move eastward
across north-central Nebraska and east-central South Dakota over the
next few hours.
Both areas have deep-layer shear that appears marginal for
supercells. For this reason, hail sizes should remain close to one
inch in the more intense updrafts. But as multicell line segments
organize in areas where the strong instability and steep low-level
lapse rates are present, wind damage will be possible. The greatest
wind-damage threat should occur along the leading edge of any
intense short line segment.
..Broyles.. 07/25/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...FGF...FSD...ABR...BIS...LBF...UNR...
LAT...LON 47949874 47329966 46720034 45930114 45050142 43440113
43100117 42450116 41800082 41689963 41919907 42949885
44389885 45329866 46609788 47619746 47949874
Read morefrom SPC Forecast Products http://www.spc.noaa.gov/products/md/md1334.html
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