ACUS11 KWNS 210430

SWOMCD

SPC MCD 210430 

NEZ000-SDZ000-210630-



Mesoscale Discussion 1222

NWS Storm Prediction Center Norman OK

1130 PM CDT Sat Jun 20 2026



Areas affected...portions of the Nebraska Sandhills



Concerning...Severe Thunderstorm Watch 360...



Valid 210430Z - 210630Z



The severe weather threat for Severe Thunderstorm Watch 360

continues.



SUMMARY...Thunderstorms continue moving east across portions of

north-central Nebraska this evening. Modest instability and strong

shear should maintain the MCS structure, although weak low-level

lapse rates should keep any severe threat rather isolated.



DISCUSSION...A north-south linear MCS has organized across portions

of north-central Nebraska this evening and will continue eastward

into the morning hours. The overall environment remains

kinematically favorable for thunderstorm organization (effective

layer shear greater than 50 knots), although the thermodynamic

environment remains modest at best with between 500 to 1000 J/kg of

MUCAPE along the line of storms. Additionally, low-level lapse rates

continue to weaken, with 0-3 kilometer lapse rates objectively

analyzed to be around 3 C/km. Thus, despite the linear MCS's

organization, the elevated nature of the individual thunderstorms

and the weak low-level lapse rates should limit any severe wind

potential to being isolated/sporadic in nature.



..Marsh.. 06/21/2026



...Please see www.spc.noaa.gov for graphic product...



ATTN...WFO...GID...LBF...UNR...



LAT...LON   43000123 43010026 40710021 40660124 40990127 41260203

            41970138 43000123 



MOST PROBABLE PEAK WIND GUST...55-70 MPH

MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN