Mesoscale Discussion 2295 NWS Storm Prediction Center Norman OK 0618 PM CDT Mon Sep 14 2026 Areas affected...southeast Nebraska into southwestern Iowa Concerning...Tornado Watch 669... Valid 142318Z - 150015Z The severe weather threat for Tornado Watch 669 continues. SUMMARY...Multiple severe gusts are possible over the next few hours, especially across southeastern NE. A couple of tornadoes may occur, mainly over southwestern IA. DISCUSSION...Multiple linear segments have developed over the past couple of hours, accompanied by severe gusts. These storms will continue to progress eastward amid appreciably strong mid-level flow atop a well-mixed boundary layer, accompanied by a severe gust threat. At the moment, the greatest short-term severe threat exists with storms over southeastern NE, where surface temperatures into the 80s F to near 90 F, are promoting downward momentum mixing potential. As these storms progress into southwestern IA, they will traverse a baroclinic zone with somewhat cooler surface temperatures (e.g. low 80s F), but with a more moist boundary layer given low 70s F dewpoints. Destabilization of this boundary layer is somewhat uncertain. However, should the southwest IA boundary layer destabilize, backed low-level flow and accompanying enlarged hodographs (per OAX VADs) suggest that a couple of QLCS tornadoes may develop, with a severe gust threat also continuing. ..Squitieri/Smith.. 09/14/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DMX...EAX...OAX...TOP... LAT...LON 40309736 41189682 41829559 42129455 41909384 41249348 40679416 40309540 40139627 39989729 40309736 MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH MOST PROBABLE PEAK WIND GUST...65-80 MPH MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
Source link