ACUS11 KWNS 210549

SWOMCD

SPC MCD 210548 

NEZ000-SDZ000-210615-



Mesoscale Discussion 1225

NWS Storm Prediction Center Norman OK

1248 AM CDT Sun Jun 21 2026



Areas affected...portions of the Nebraska Sandhills



Concerning...Severe Thunderstorm Watch 360...



Valid 210548Z - 210615Z



CORRECTED FOR GRAPHIC



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   41230203 41960140 42990121 43030021 42169979 41409988

            40720019 40670121 41020128 41230203 



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

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