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ACUS11 KWNS 240717
SWOMCD
SPC MCD 240716
NEZ000-KSZ000-COZ000-240815-
Mesoscale Discussion 0852
NWS Storm Prediction Center Norman OK
0216 AM CDT Sun Jun 24 2018
Areas affected...northeast Colorado...northwest Kansas...and
southwest Nebraska
Concerning...Severe potential...Watch possible
Valid 240716Z - 240815Z
Probability of Watch Issuance...40 percent
SUMMARY...Isolated severe thunderstorms with a threat of hail will
continue through the morning. Trends will be monitored for possible
watch.
DISCUSSION...Thunderstorms are developing within northeast Colorado
in response to increasing warm-air advection stemming from a
strengthening low-level jet and large-scale ascent associated with a
short-wave trough across the northern Rockies. Mid-level lapse rates
on the order of 8-9 C/km, most-unstable CAPE values around 2000
J/kg, and deep-layer shear on the order of 40-50 knots will continue
to support a hail threat with any sustained, vigorous updraft.
Thunderstorm coverage is expected to continue to increase through
the morning, making it increasingly difficult for thunderstorms to
remain isolated enough to fully realize the environment's potential.
Thus, the destructive interference between competing updrafts should
preclude a more robust large hail threat. As such, trends will
continue to be monitored for possible watch needs.
..Marsh/Guyer.. 06/24/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LBF...DDC...GLD...PUB...BOU...CYS...
LAT...LON 39270404 40140420 41070308 41210152 40820079 38560089
38520253 39270404
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