SWOD48
SPC AC 270832
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0332 AM CDT FRI APR 27 2007
VALID 301200Z - 051200Z
..DISCUSSION...
PATTERN CONTINUES TO CHANGE DURING THE DAY 4 AND DAY 5 PERIOD AS
SEVERAL SHORTWAVE TROUGHS MOVE NEWD FROM THE SRN PLATEAU REGION INTO
THE MID MS VALLEY AHEAD OF BROAD VORTEX MOVING OUT OF THE GULF OF
ALASKA TOWARDS THE PACIFIC NORTHWEST. THE ECMWF IS A BIT SLOWER
THAN THE GFS AFTER DAY 5 AS A HIGH AMPLITUDE TROUGH MOVES INTO THE
WRN U.S. AND ANOTHER TROUGH MOVES SEWD OUT OF HUDSON BAY TOWARDS THE
NERN U.S. ESSENTIALLY CREATING A HIGH AMPLITUDE OMEGA PATTERN OVER
NORTH AMERICA. THE GFS CREATES A SERIES OF LOW PRESSURE SYSTEMS
THAT MOVE NNEWD THRU THE NRN HIGH PLAINS WITH THE MAIN FEATURE
DEVELOPING BY THE END OF THIS PERIOD SOMEWHERE BETWEEN ERN CO AND
ERN MT. THUS...THE WIDE RANGE OF SOLUTIONS AT THIS TIME GIVEN BY
THE EXTENDED TRENDS GIVES A LOW PREDICTABILITY TO INCLUDE A SEVERE
RISK.
.MCCARTHY.. 04/27/2007
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