ACUS11 KWNS 270100
SWOMCD
SPC MCD 270059
OKZ000-270300-
MESOSCALE DISCUSSION 0559
NWS STORM PREDICTION CENTER NORMAN OK
0759 PM CDT FRI APR 26 2013
AREAS AFFECTED...CNTRL AND ERN OK
CONCERNING...SEVERE THUNDERSTORM WATCH 139...
VALID 270059Z - 270300Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 139
CONTINUES.
SUMMARY...A FEW SEVERE THUNDERSTORMS WILL CONTINUE TO MOVE ESEWD
ACROSS CNTRL OK AND EVENTUALLY E OF THE CURRENT WATCH. A NEW WW MAY
BE REQUIRED BY 03Z.
DISCUSSION...A LINE OF THUNDERSTORMS CURRENTLY EXISTS ALONG AN
ADVANCING COLD FRONT ASSOCIATED WITH THE SHORTWAVE TROUGH. COOLING
ALOFT AND DEEP FORCING FOR ASCENT WILL MAINTAIN THESE STORMS THROUGH
THE EVENING DESPITE A RELATIVELY MARGINAL THERMODYNAMIC ENVIRONMENT
AS SEEN ON 00Z OUN SOUNDING. COUNTERACTING MARGINAL INSTABILITY WILL
ALSO BE AN INCREASING LOW LEVEL JET WITH 30-35 KT SLY FLOW EXPECTED.
THE STRONGEST CELL IS CURRENTLY ENTERING CANADIAN COUNTY WITH LARGE
HAIL AND DAMAGING WIND LIKELY. AT ITS CURRENT SPEED...THIS SEVERE
STORM WILL ENTER WRN OK COUNTY AROUND 845 PM CDT...AND DOWNTOWN OKC
AROUND 900 PM CDT WITH DAMAGING HAIL AND WIND. THIS CELL MAY
EVENTUALLY TURN RIGHT AS THE INCREASING LOW LEVEL JET INCREASES THE
PROPAGATIONAL COMPONENT OF THE MOTION.
..JEWELL.. 04/27/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...OUN...
LAT...LON 35219898 36029805 35409538 34889517 34389529 34059574
34009634 34519781 35219898
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