MD 0749 CONCERNING TORNADO WATCH 231… FOR NORTHEAST KS…NORTHERN MO…EASTERN NE…IA
Mesoscale Discussion 0749 NWS Storm Prediction Center Norman OK 0225 PM CDT Wed May 17 2017 Areas affected...Northeast KS...Northern MO...Eastern NE...IA Concerning...Tornado Watch 231... Valid 171925Z - 172030Z The severe weather threat for Tornado Watch 231 continues. SUMMARY...Greatest tornado threat appears to be shifting to the northern half of WW231. DISCUSSION...Surface low has moved quickly into east-central NE, just northwest of OMA. Substantial boundary-layer drying has advected northeast across KS into western MO where surface dew points have lowered into the low-mid 50s. This drying should continue as south-southwesterly winds are gusting well in excess of 40kt across southeast KS/southwest MO. In response to large-scale forcing shifting into the mid MS Valley, boundary-layer moisture will likely hold across the northern half of IA into southern WI. It appears the most robust convection will focus along a corridor from southeast NE...northeast toward southwest WI. Numerous showers/thunderstorms are evolving within this zone and discrete supercells should mature over the next few hours. Tornado threat should increase across this region, along and south of synoptic front draped from northwest IA into southeast MN. ..Darrow.. 05/17/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DMX...EAX...FSD...OAX...TOP... LAT...LON 41979684 42989303 39649303 38649684 41979684
from SPC Mesoscale Discussions http://bit.ly/1TM7O56
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