SPC Oct 21, 2017 0100 UTC Day 1 Convective Outlook

By Newsroom America Feeds at 20 Oct 2017

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0759 PM CDT Fri Oct 20 2017 Valid 210100Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated to widely scattered storms, a couple of which could be strong, are expected late this evening into the overnight from the central Plains to Minnesota. ...Central Plains/Upper Midwest... Gradual height falls and the increasing influence of cyclonic upper flow will overspread the region in conjunction with increasing warm/moist advection atop a stable boundary layer. A relatively moist/unstable air mass across the south-central Plains by mid/late October standards (sampled by 00Z observed soundings such as Dodge City KS and Norman OK) will advect northeastward tonight. Isolated to widely scattered thunderstorms are expected to develop and increase late this evening and especially overnight within a corridor from NE/northern KS into IA/MN. Steep mid-level lapse rates and sufficient elevated buoyancy could support a few stronger storms, but the overall potential for severe-caliber hail should be limited by a modest combination of effective shear/buoyancy. ..Guyer.. 10/21/2017 Read more



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