MD 0553 CONCERNING SEVERE POTENTIAL…WATCH LIKELY FOR CENTRAL/NORTHEAST OK…SOUTHEAST KS…FAR WESTERN MO
Mesoscale Discussion 0553 NWS Storm Prediction Center Norman OK 0457 PM CDT Tue Apr 25 2017 Areas affected...Central/Northeast OK...Southeast KS...Far Western MO Concerning...Severe potential...Watch likely Valid 252157Z - 260000Z Probability of Watch Issuance...95 percent SUMMARY...Thunderstorm coverage will increase along the front over the next hour or two with some severe storms likely. Primary severe threats are very large hail and damaging wind gusts. A tornado or two is also possible, particularly with any storms near the southern end of the line around 00Z to 03Z. DISCUSSION...Latest surface analysis placed a low over south-central IA with a cold front extending southwestward from the low across eastern KS and north-central OK to another low south of JWG. The cold front then continues westward from this second low into the TX panhandle. A dryline also extends from the second low southward/southwestward into western north Texas. Moisture continues to advect northward ahead of these boundaries with low 60 dewpoints now into central OK with mid 50s extending into southeast KS/far western MO. As the cold front continues southeastward and the subtle lead shortwave trough progresses into the region (evidenced by elevated echos/virga currently moving through western OK), forcing for ascent, both on the meso-alpha and meso-beta scales, will gradually increase with eventual convective initiation anticipated. This convective initiation appears most likely along the cold front from near Logan, Payne, and Noble counties in north-central OK northeastward to around Elk and Wilson counties in southeast KS. Once more persistent updrafts are established, the strongly sheared airmass (0-6 km bulk shear in excess of 50 kt) will favor rotating storms capable of large hail, some potentially greater than 2 inches in diameter, damaging wind gusts, and potentially a tornado or two. The relatively higher tornado threat is most likely towards the southwestern end of any line of convection that develops where the better moisture and instability exist. Additionally, the most likely time frame for any tornadoes would be around 00Z to 03Z as the low-level jet increases and the boundary layer is not overly hostile to surface-based convection. A watch will likely be needed in the next hour to cover this anticipated severe threat. ..Mosier/Guyer.. 04/25/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...SGF...EAX...TSA...TOP...ICT...OUN... LAT...LON 35709786 37219639 38379560 38699478 38669404 37179416 36159490 34929706 35029835 35709786
from SPC Mesoscale Discussions http://bit.ly/1F4JK68
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