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Mesoscale Discussion 1009
NWS Storm Prediction Center Norman OK
0451 PM CDT Fri Jun 26 2020
Areas affected...Southeast Wyoming...southwest Nebraska
Panhandle...eastern Colorado
Concerning...Severe Thunderstorm Watch 306...
Valid 262151Z - 262315Z
The severe weather threat for Severe Thunderstorm Watch 306
continues.
SUMMARY...Damaging winds, large hail, and a tornado or two are
possible for the next 1 to 2 hours. The primary threat will be
damaging wind by later this evening.
DISCUSSION...Numerous thunderstorms have developed over the Rockies
this afternoon. Two stronger supercells have moved off of the higher
terrain near Cheyenne and south of Denver. The KFTG VWP continues to
show 45 knot winds around 6 km and weak, deep low-level easterly
upslope flow. Therefore, effective shear is around 55 knots and will
continue to support storm organization/rotation with these storms
and any additional storms as they develop. Eventually, storms are
expected to merge into a cluster by later this evening and the
primary threat will be damaging winds.
The KFTG VWP shows significant low-level turning with 0-1 SRH around
125 m2/s2 and 0-3 km SRH around 300 m2/s2. This will promote some
low-level mesocyclone organization and possibly a tornado or two.
However, limited moisture and weak flow in the lowest 3 km should
limit the overall tornado threat.
..Bentley.. 06/26/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LBF...GLD...PUB...BOU...CYS...
LAT...LON 39030538 39940564 41150554 41570520 41780396 41080206
39390223 38510329 37820440 38070517 39030538
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