MD 0520 CONCERNING TORNADO WATCH 148… FOR SOUTHEAST NEBRASKA…SOUTHWEST IOWA
Mesoscale Discussion 0520 NWS Storm Prediction Center Norman OK 0530 PM CDT Wed Apr 19 2017 Areas affected...Southeast Nebraska...Southwest Iowa Concerning...Tornado Watch 148... Valid 192230Z - 192330Z The severe weather threat for Tornado Watch 148 continues. SUMMARY...Severe thunderstorm threat should increase across Tornado Watch 148 over the next few hours. DISCUSSION...Large-scale forcing for ascent appears to be increasing across eastern NE early this evening, per visible satellite imagery where rapid increase in elevated convection is noted. Frontal convection should increase markedly over the next few hours and spread/develop from southeast NE into southwest IA. With low-level warm advection expected to increase across central IA it appears thunderstorms will evolve along/north of the warm front as well. Large hail and damaging winds are the primary threats with convection along the cool side of each boundary while any meaningful tornado threat should be confined to warm-sector supercells that don't get undercut by the cold front. ..Darrow.. 04/19/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DMX...EAX...OAX...TOP...GID... LAT...LON 41829677 41829445 39979521 39989747 41829677
from SPC Mesoscale Discussions http://bit.ly/2oQphyG
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