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Mesoscale Discussion 0290
NWS Storm Prediction Center Norman OK
0753 PM CDT Mon Apr 06 2020
Areas affected...northeast South Dakota...southeast North
Dakota...west-central Minnesota
Concerning...Severe potential...Watch unlikely
Valid 070053Z - 070330Z
Probability of Watch Issuance...5 percent
SUMMARY...Isolated marginally severe hail is possible this evening
from northeast South Dakota into west-central Minnesota. A few
strong wind gusts may occur as well.
DISCUSSION...Isolated cells continue to form west of the ABR area
downstream of the steeper low-level lapse rates and where
boundary-layer dewpoints in the lower 50s F are contributing to
MUCAPE up to 1500 J/kg. The 00Z ABR sounding shows steep lapse rates
aloft, 50 kt 0-6 km shear and elongated hodographs aloft. This
should be enough to sustain a few strong or marginally severe cells.
Gradual height falls/cooling aloft will continue through tonight,
while surface convergence near the low moves east across northern SD
and into MN by 09Z. Given increasing lift, a gradual increase in
storm coverage is expected. Precipitable water values of 0.75" or
less further suggests a limited severe threat.
..Jewell/Grams.. 04/07/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MPX...FGF...ABR...BIS...
LAT...LON 44789831 44589905 44899952 45329975 45749971 46389851
46829714 46689622 46259586 45669595 45219645 44789831
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