MD 1525 CONCERNING SEVERE POTENTIAL…WATCH UNLIKELY FOR PORTIONS OF EASTERN KS AND NORTHERN/CENTRAL MO
Mesoscale Discussion 1525 NWS Storm Prediction Center Norman OK 0550 PM CDT Fri Aug 18 2017 Areas affected...Portions of eastern KS and northern/central MO Concerning...Severe potential...Watch unlikely Valid 182250Z - 190045Z Probability of Watch Issuance...20 percent SUMMARY...Some increase in an isolated threat for strong to damaging winds and large hail may occur over the next several hours. Watch issuance appears unlikely at this time, although convective trends will be closely monitored. DISCUSSION...A secondary vorticity maximum located over southeastern NE is embedded within a large-scale upper trough across the Upper Midwest. At the surface, a low is present over southern IA, with a weak boundary/front trailing southwestward across northern MO into northeastern KS per surface observations and trends in visible satellite imagery. A band of convection has recently formed along/just north of the surface boundary across northern MO. Given its fast motion, this activity is probably elevated as of 2245Z. Several more robust thunderstorms have also formed along the KS/MO border to the north of Kansas City. This convection appears to be surface based, and given the presence of strong instability to the south of the boundary (MLCAPE 2000-3000 J/kg), tendency may be for these thunderstorms to develop south-southeastward along an instability gradient this evening. Although low-level flow remains modest, west/northwesterly winds do increase at mid/upper levels, and 30-40 kt of effective bulk shear should provide some potential for updraft organization. Given the linear forcing of the surface boundary, a cluster or short line segments may develop from the convection located across the KS/MO border, with an attendant isolated threat for both damaging winds and large hail. Convective evolution of the elevated band of storms through this evening in northern MO is less clear. At this time, the severe threat may remain too confined in space/time to warrant watch issuance. ..Gleason/Edwards.. 08/18/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LSX...DVN...SGF...EAX...TOP... LAT...LON 39429532 39849476 40059358 40569252 40569174 40019156 39149160 38729199 38219282 37859454 38229535 39079553 39429532
from SPC Mesoscale Discussions http://bit.ly/1IkdKbF
Be First to Comment