MD 0545 CONCERNING SEVERE THUNDERSTORM WATCH 131… FOR SOUTHEASTERN NEBRASKA AND NORTHEAST KANSAS.
Mesoscale Discussion 0545 NWS Storm Prediction Center Norman OK 0501 PM CDT Sun May 05 2019 Areas affected...Southeastern Nebraska and northeast Kansas. Concerning...Severe Thunderstorm Watch 131... Valid 052201Z - 052330Z The severe weather threat for Severe Thunderstorm Watch 131 continues. SUMMARY...A cluster of supercells in southeastern Nebraska are producing large to potentially very large hail. This threat is expected to continue into the evening as these storms drift southward along a slow moving cold front. DISCUSSION...Several supercells in southeast Nebraska have been producing large hail for the past few hours. The westernmost supercell in Hamilton county Nebraska has produced multiple golf ball sized hail reports and latest MESH trends suggest hail in excess of 2 inches may be possible. Expect the westernmost storm in this cluster to continue to pose the greatest severe threat due to the higher instability (2000 J/kg MLCAPE per RAP mesoanalysis). Current effective shear is around 30 to 35 knots per RAP mesoanalysis and UEX/OAX VWP, however, mid-level winds are expected to increase through the evening which will further support supercell organization. In addition, a low-level jet is expected to increase somewhat during the late evening and early overnight hours which, combined with maintenance due to the dynamic pressure perturbations of the rotating updrafts, will support a severe threat continuing after dark, possibly into northeast Kansas. Additional storm development is possible along the cold front in western portions of watch 131. Cumulus have become more numerous along the line in the last hour and low-level moisture advection into this area will lead to continued destabilization along the boundary. Very steep mid-level lapse rates (9.3 C/km per 12Z LBF RAOB) will continue to support very large hail with the strongest updrafts, especially in the western half of watch 131 where destabilization is greatest. ..Bentley.. 05/05/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...EAX...OAX...TOP...GID...GLD... LAT...LON 41249859 41409797 41449722 41409663 41259593 40639574 40049548 39769566 39649710 39789846 39889904 39889958 39919986 40059995 40349997 40809937 41249859
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