SPC MD 1184
MD 1184 CONCERNING SEVERE THUNDERSTORM WATCH 347... FOR EASTERN WYOMING...WESTERN SOUTH DAKOTA

Mesoscale Discussion 1184
NWS Storm Prediction Center Norman OK
1150 PM CDT Tue Jun 20 2023

Areas affected...Eastern Wyoming...Western South Dakota

Concerning...Severe Thunderstorm Watch 347...

Valid 210450Z - 210645Z

The severe weather threat for Severe Thunderstorm Watch 347
continues.

SUMMARY...A threat for large hail and wind damage will likely
continue for a couple more hours across parts of the northern High
Plains.

DISCUSSION...The latest high-resolution radar imagery from Rapid
City, South Dakota shows a cluster of strong to severe storms from
far eastern Wyoming into far western South Dakota. These storms are
located near and to the north of a quasi-stationary front, where
low-level convergence is maximized. The RAP suggests that MLCAPE
near the boundary is in the 1500 to 3000 J/kg range, and that 0-6 km
shear is near 40 knots. This area is also located near an axis of
steep mid-level lapse rates, where 700-500 mb lapse rates are
estimated to be near 8.0 C/km. This environment will likely continue
support a severe threat over the next couple hours. Supercells and
short bowing line segments will have wind damage potential. Isolated
large hail will also be possible.

..Broyles.. 06/21/2023

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

ATTN...WFO...UNR...CYS...

LAT...LON   45270316 45300257 45040217 44470210 43880259 42900367
            42720453 42900490 43510508 44150444 45050351 45270316 

Read more
https://www.spc.noaa.gov/products/md/md1184.html