MD 1152 CONCERNING SEVERE POTENTIAL…WATCH POSSIBLE FOR SOUTHERN NE…NORTHERN KS…EASTERN CO
Mesoscale Discussion 1152 NWS Storm Prediction Center Norman OK 0203 PM CDT Mon Jun 26 2017 Areas affected...Southern NE...Northern KS...Eastern CO Concerning...Severe potential...Watch possible Valid 261903Z - 262030Z Probability of Watch Issuance...40 percent SUMMARY...Isolated to widely scattered severe thunderstorms are possible this afternoon, with a threat of large hail and locally damaging wind gusts. DISCUSSION...A thunderstorm has recently intensified across southwest NE, with additional towering cumulus noted extending into far northeast CO along a weak cold front. Towering cumulus has also recently developed across along a weak surface trough into east-central CO. While large-scale forcing is subtle at best, slight moistening noted on WV imagery is suggestive that modest ascent is overspreading the region. Additional storms will likely be focused along the weak cold front extending from northeast CO into southwest NE/north-central KS, and also along a NNW-SSE oriented outflow boundary running from north of Concordia, KS to just east of Salina, KS. Moderate midlevel northwesterly flow will continue to support effective shear of 35-45 kts through the afternoon, which will be sufficient to support organized convection, and a few supercells will be possible later this afternoon. Buoyancy and midlevel lapse rates are greatest across eastern CO/northwest KS/southwest NE and decrease with eastward extent, but MLCAPE of 750-1500 J/kg across the MCD area will be sufficient for some hail risk with the strongest cells. Weak low-level flow will tend to limit the damaging wind risk to some extent, but steep low-level lapse rates will support some wind gust potential, especially with any upscale growth that may occur later this afternoon. Some uncertainty remains regarding the coverage of the severe threat this afternoon, but watch issuance is possible if multiple organized cells/clusters appear imminent. ..Dean/Guyer.. 06/26/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TOP...ICT...GID...LBF...DDC...GLD...PUB...BOU... LAT...LON 40810231 40379938 40129760 39759725 38499624 38379722 38490112 38610319 39250343 40420306 40810231
from SPC Mesoscale Discussions http://bit.ly/2tc1wW5
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