Mesoscale Discussion 1504 NWS Storm Prediction Center Norman OK 0639 PM CDT Sat Aug 15 2020 Areas affected...Northeast ND...Northern MN Concerning...Severe Thunderstorm Watch 441... Valid 152339Z - 160115Z The severe weather threat for Severe Thunderstorm Watch 441 continues. SUMMARY...Severe threat continues across mostly northern Minnesota. DISCUSSION...Pre-frontal low-level lapse rates are quite steep across the northern Plains into western ON where surface-3km values remain near 9 C/km. Over the last few hours convection has focused along a surface front, mostly across western ON/southeast MB; although, an isolated thunderstorm has recently developed over northwest MN. With low-level flow veered ahead of the front, surface convergence necessary for robust convection is tied closely to the boundary, and strongest north of the border. Even so, convection that is organizing across western ON should gradually sag south into northern MN. Gusty winds and some hail threat remain. ..Darrow.. 08/15/2020 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DLH...FGF... LAT...LON 47349735 49099733 48369310 46659312 47349735Read more
from SPC Forecast Products http://www.spc.noaa.gov/products/md/md1504.html
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