Severe Storm Outlook Narrative (AC)
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836
ACUS11 KWNS 220316
SWOMCD
SPC MCD 220316
SDZ000-220445-

Mesoscale Discussion 1388
NWS Storm Prediction Center Norman OK
1016 PM CDT Fri Jul 21 2017

Areas affected...Southeast SD

Concerning...Severe potential...Watch unlikely

Valid 220316Z - 220445Z

Probability of Watch Issuance...20 percent

SUMMARY...Some damaging wind and marginally severe hail threat may
extend into portions of southeast SD late tonight.

DISCUSSION...A cluster of strong semi-discrete cells is ongoing
across portions of northeast SD. One potentially severe cell in
Spink County SD is moving southeast and will eventually move out of
WW 428, with a short-term threat of severe hail/wind. It is
uncertain how far southeast the threat will extend in SD, given
increasing SBCINH as nocturnal cooling continues. However, some
upscale growth out of the convective cluster in northeast SD is
possible, resulting in some potential for locally damaging wind into
late tonight. At this time, the severe potential is expected to
remain too marginal for watch issuance.

..Dean/Guyer.. 07/22/2017

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

ATTN...WFO...FSD...ABR...

LAT...LON   43719924 44029864 44579762 44579670 44219654 43589660
            43369683 43249701 43139775 43099846 43129897 43139918
            43259937 43579941 43719924




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