ZCZC SPCSWOMCD ALL
ACUS11 KWNS 200602 
SPC MCD 200602 
SDZ000-200700-

MESOSCALE DISCUSSION 1080
NWS STORM PREDICTION CENTER NORMAN OK
0102 AM CDT SAT JUN 20 2015

AREAS AFFECTED...SRN AND CENTRAL INTO ERN SD

CONCERNING...SEVERE THUNDERSTORM WATCH 315...

VALID 200602Z - 200700Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 315
CONTINUES.

SUMMARY...A FAST...ESEWD-MOVING BOW ECHO WILL REMAIN CAPABLE OF
PRODUCING SEVERE WIND GUSTS OF 60-80 MPH THROUGH ABOUT 07-08Z AS IT
ADVANCES THROUGH THE EASTERN EXTENT OF WW 315 AT AROUND 50 KT. 
GIVEN A  RECENT EWD TRAJECTORY WITH THE PORTION OF THE BOW IN
STANLEY/JONES COUNTIES...A FEW COUNTIES ON THE NORTHEAST EXTENT OF
THIS WW HAVE BEEN ADDED THROUGH COORDINATION WITH WFO ABR.  FURTHER
COUNTY EXTENSION MAY BE NEEDED INTO PARTS OF ERN SD OR A NEW WW
COULD BE REQUIRED.

DISCUSSION...A FAST /NOW PRIMARILY/ ESEWD-MOVING BOW STRUCTURE IS
SPREADING ACROSS THE CORRIDOR OF STRONGEST RESIDUAL INSTABILITY
/MUCAPE UP TO 3000 J PER KG/.  THIS COUPLED WITH A 50-KT SSWLY LLJ
EXTENDING INTO THIS FORWARD-PROPAGATING MCS AND A 50+ KT WLY LOWER-
TO MID- TROPOSPHERIC JET /BETWEEN 4-7 KM AGL PER KUDX VAD/ WILL
CONTINUE TO RESULT IN STRONG/DAMAGING SEVERE WINDS AS WAS RECENTLY
OBSERVED AT KPIR WITH 53 KT AT 0538Z.

A MORE STABLE AIR MASS WITH EWD EXTENT INTO SWRN MN AND RELATIVELY
STRONG CAP WITH EWD EXTENT AS WELL SHOULD RESULT IN SOME WEAKENING
TREND AFTER 07-08Z.  THIS TREND IS GENERALLY BEING OBSERVED WITH A
WEAKENING OF UPDRAFTS PER 9-KM CAPPI.

..PETERS/MEAD.. 06/20/2015

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

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

LAT...LON   43370162 44050132 44690012 44879845 44769726 44329715
            43599706 43169724 42949745 43079828 43170043 43370162 

NNNN