MESO: Mesoscale Discussion 1074

ACUS11 KWNS 121602
SWOMCD
SPC MCD 121601
ARZ000-MOZ000-OKZ000-KSZ000-121730-

MESOSCALE DISCUSSION 1074
NWS STORM PREDICTION CENTER NORMAN OK
1101 AM CDT FRI JUN 12 2009

AREAS AFFECTED...NERN AND E-CNTRL OK INTO NWRN AR

CONCERNING...SEVERE THUNDERSTORM WATCH 387...

VALID 121601Z - 121730Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 387
CONTINUES.

THE THREAT FOR DAMAGING WINDS IS EXPECTED TO INCREASE THROUGH LATE
MORNING AS BOW ECHO CONTINUES SEWD THROUGH PARTS OF NERN AND E-CNTRL
OK INTO NWRN AR. LARGE HAIL AND LOCALLY DAMAGING WINDS WILL ALSO BE
POSSIBLE WITH SUPERCELLS DEVELOPING DOWNSTREAM FROM MCS.
EXTRAPOLATION OF MCS MOTION TAKES IT E OF WW 387 BEFORE 18Z AND A
PDS SEVERE TSTM WATCH WILL BE ISSUED PRIOR TO 17Z.

AS OF 1540Z...REGIONAL RADAR IMAGERY INDICATED BOW ECHO FROM ROGERS
AND MAYS COUNTIES SWWD TO CREEK AND LINCOLN COUNTIES IN OK. THE
LAST SEVERAL VOLUME SCANS HAVE SHOWN A WELL-DEFINED REAR INFLOW
NOTCH DEVELOPING OVER NRN TULSA INTO ROGERS COUNTIES. AN ASSOCIATED
ACCELERATION HAS OCCURRED WITH THIS PORTION OF THE BOW TO 40-45 KT
WITH INOLA AND CLAREMORE OK MESONET SITES REPORTING WIND GUSTS TO 85
AND 61 MPH RESPECTIVELY. DOWNSTREAM AIR MASS INTO W-CNTRL AR IS
WARMING INTO THE LOWER 80S WHICH SHOULD ALLOW FOR A MORE EFFICIENT
TRANSFER OF MOMENTUM INTO THE BOUNDARY LAYER...LIKELY RESULTING IN
AN INCREASED THREAT OF MORE WIDESPREAD DAMAGING WINDS.

ELSEWHERE...SPLITTING SUPERCELLS WERE OBSERVED OVER HASKELL AND
MUSKOGEE AND SEQUOYAH COUNTIES INTO ERN OK WITHIN ZONE OF
STRENGTHENING LOW-LEVEL WAA AHEAD OF BOW ECHO. WHILE SOME THREAT OF
A TORNADO WILL EXIST WITH CYCLONIC MEMBER...IT APPEARS THAT LARGE
HAIL WILL REMAIN THE PRIMARY SEVERE WEATHER THREAT WITH THESE
STORMS.

..MEAD.. 06/12/2009

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

ATTN...WFO...LZK...SGF...TSA...ICT...OUN...

LAT...LON 34959628 35539680 35999709 36709675 36969644 37009530
36519396 35689349 35089397 34709479 34959628

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