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Mesoscale Discussion 0694
NWS Storm Prediction Center Norman OK
0753 PM CDT Sat May 23 2020
Areas affected...Central nebraska and South Dakota
Concerning...Severe potential...Watch likely
Valid 240053Z - 240230Z
Probability of Watch Issuance...95 percent
SUMMARY...Thunderstorms organizing across Nebraska and south Dakota
should persist east out of WW208 over the next 1 to 2 hours. The
threat for damaging winds remains, and a downstream watch is likely
needed.
DISCUSSION...An MCS is organizing across portions of Nebraska and
South Dakota ahead of a mid-level shortwave trough. An uptick in
convective intensity and coverage has been noted over the last hour.
This is likely due to increased low-level mass response from the
low-level jet advecting in deeper moisture ahead of the storms.
Increased moisture with surface dewpoints in the upper 50s to low
60s will support robust updrafts. The predominately linear mode will
favor a threat for damaging wind gusts this evening, though severe
hail will also be possible with the initial convection. A new watch
is likely downstream of WW208 within the hour.
..Lyons.. 05/24/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...FSD...ABR...GID...BIS...LBF...UNR...
LAT...LON 43680123 44000118 44570119 44810124 45010159 45140169
45420188 45660201 45830194 45940169 45940058 45969990
45929957 45819935 45529908 45219890 44849869 44299848
44119849 43409838 42869848 42209867 42019871 41759872
41399886 40929932 40659952 40519987 40460009 40410034
40410060 40450106 40610121 40970129 41360137 41760134
42590124 43680123
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