Severe Storm Outlook Narrative (AC)
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ACUS11 KWNS 160647
SWOMCD
SPC MCD 160647
IAZ000-160815-
Mesoscale Discussion 1287
NWS Storm Prediction Center Norman OK
0147 AM CDT Sun Jun 16 2024
Areas affected...portions of IA
Concerning...Severe Thunderstorm Watch 421...
Valid 160647Z - 160815Z
The severe weather threat for Severe Thunderstorm Watch 421
continues.
SUMMARY...Isolated thunderstorms may sporadically produce hail the
next couple hours.
DISCUSSION...Thunderstorms on the back side of an MCV over
western/central IA have occasionally intensified the past hour or
so. Midlevel lapse rates will remain weak over the area due to
earlier convection. However, sufficient instability is present on
the periphery of the MCV, along with enhanced vertical shear, to
sustain briefly strong storms. As convection develops
east/northeast, overall weakening is expected as the airmass becomes
less favorable for severe storms. A new watch is not expected, and
WW 421 will expire at 07z.
..Leitman.. 06/16/2024
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DMX...FSD...OAX...
LAT...LON 42019570 42469571 42779548 42999492 42869394 42519324
42029304 41539291 41289316 41379404 41569479 41949567
42019570