SPC MD 1469

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MD 1469 CONCERNING SEVERE THUNDERSTORM WATCH 432… FOR SOUTHWESTERN NORTH DAKOTA/NORTHWESTERN SOUTH DAKOTA Mesoscale Discussion 1469 NWS Storm Prediction Center Norman OK 1003 PM CDT Tue Aug 11 2020 Areas affected…southwestern North Dakota/northwestern South Dakota Concerning…Severe Thunderstorm Watch 432… Valid 120303Z – 120500Z The severe weather threat for Severe Thunderstorm Watch 432 continues. SUMMARY…Risk for damaging winds continues in/near WW 432. DISCUSSION…latest radar loop shows a semi-continuous band of storms moving east-southeastward across southwestern North Dakota and adjacent northwestern South Dakota at around 30 kt. With low-level southeasterly flow veering to west-northwesterly aloft, and favorable downstream instability in place, expect storms to continue crossing the WW — accompanied by risk for strong/locally damaging wind gusts. Greatest short-term risk exists across Perkins County South Dakota, where the most intense/vigorous band of storms is occurring. With an axis of 3000 J/kg mixed-layer CAPE just to the southeast, extending southeastward across South Dakota, expect this band of storms to remain organized/forward-propagating. ..Goss.. 08/12/2020 …Please see www.spc.noaa.gov for graphic product… ATTN…WFO…ABR…BIS…UNR…BYZ… LAT…LON 45860390 45990316 46460250 47180216 46750079 45320020 44540134 45300448 45860390 Read more
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