ZCZC SPCSWOMCD ALL
ACUS11 KWNS 130257 
SPC MCD 130257 
MNZ000-130400-

MESOSCALE DISCUSSION 1671
NWS STORM PREDICTION CENTER NORMAN OK
0957 PM CDT WED AUG 12 2015

AREAS AFFECTED...NERN ND THROUGH NWRN MN

CONCERNING...SEVERE THUNDERSTORM WATCH 485...

VALID 130257Z - 130400Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 485
CONTINUES.

SUMMARY...SEVERE THREAT MAY PERSIST PRIMARILY OVER NWRN MN THROUGH
04-05Z. WHILE OVERALL THREAT IS NOT SUFFICIENT FOR ANOTHER WW
ISSUANCE...A LOCAL EXTENSION IN TIME MIGHT BE NEEDED FOR A PORTION
OF THIS AREA DEPENDING ON CONVECTIVE TRENDS.

DISCUSSION...STORMS /INCLUDING A PERSISTENT SUPERCELL/ CONTINUE
WITHIN ZONE OF ISENTROPIC ASCENT RESULTING FROM A STRENGTHENING SWLY
LLJ INTERACTING WITH A WWD MOVING OUTFLOW BOUNDARY. STORMS WILL
PERSIST ALONG COOL SIDE OF THIS BOUNDARY AND ARE SLIGHTLY
ELEVATED...BUT EFFECTIVE SHEAR REMAINS FAVORABLE FOR SUPERCELLS WITH
A THREAT FOR LARGE HAIL AND DAMAGING WIND. AS TEMPERATURES ALOFT
CONTINUE TO WARM...THE ENVIRONMENT SHOULD EVENTUALLY BECOME
INCREASINGLY HOSTILE TO DEVELOPING STORMS...RESULTING IN A WEAKENING
TREND. IN THE MEANTIME THE SEVERE THREAT WILL PERSIST...POSSIBLY AN
HOUR OR SO BEYOND WW EXPIRATION TIME.

..DIAL.. 08/13/2015

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...DLH...FGF...

LAT...LON   46759533 47839639 48289585 47569493 46769457 46759533 

NNNN