Tuesday, September 4, 2007

DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 040845
SWOD48
SPC AC 040844

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0344 AM CDT TUE SEP 04 2007

VALID 071200Z - 121200Z

..DISCUSSION...
PREDICTABILITY AMONG THE MEDIUM RANGE MODELS BEGINS TO DIMINISH
AFTER THURSDAY. THERE ARE INDICATIONS THAT THE INITIAL STRONG
MID-LEVEL IMPULSE MOVING OUT OF THE PLAINS AND INTO SERN CANADA WILL
BE FOLLOWED BY SEVERAL MORE WAVES. THIS WILL PROBABLY REINFORCE A
BROAD TROUGH ACROSS THE NRN HALF OF THE COUNTRY INTO NEXT
WEEKEND...BUT THE TIMING/AMPLITUDE OF SUCH FEATURES IS UNCERTAIN.
INITIAL SURGE OF CP AIR MASS WILL REACH THE MIDWEST AND CNTRL PLAINS
ON THURSDAY. TAIL-END OF THIS FRONT WILL LIKELY REDEVELOP NWD LATER
IN THE WEEK/WEEKEND AS JET ENERGY DIGS SEWD...BUT GIVEN TIMING
UNCERTAINTY OF EACH WAVE...DETERMINATION OF A REGIONAL SVR WX RISK
IS NOT JUSTIFIED AT THIS POINT.

.RACY.. 09/04/2007

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