SWOD48
SPC AC 210905
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0305 AM CST MON JAN 21 2008
VALID 241200Z - 291200Z
AT THE BEGINNING OF THE 4 TO 8 DAY PERIOD...THE MEDIUM RANGE MODELS
HAVE AN UPPER-LEVEL TROUGH OVER THE ERN US WITH AN UPPER-LEVEL RIDGE
IN THE ROCKIES. THE MODELS DEVELOP AN UPPER-LEVEL TROUGH IN THE WRN
STATES BY THIS WEEKEND AND MOVE THE TROUGH QUICKLY EWD ACROSS THE
CNTRL US BY EARLY NEXT WEEK. LOW-LEVEL MOISTURE WILL LIKELY RETURN
AHEAD OF THIS TROUGH INTO THE MS VALLEY AND THUNDERSTORMS WILL BE
POSSIBLE AS A COLD FRONT MOVES SEWD ACROSS THE REGION.
HOWEVER...TIMING DIFFERENCES IN THE SPEED OF THE TROUGH AND
QUESTIONS CONCERNING INSTABILITY MAKE SEVERE THUNDERSTORM POTENTIAL
UNCERTAIN ATTM. IF A SEVERE THREAT DOES DEVELOP LATE THIS WEEKEND OR
EARLY NEXT WEEK...THE AREAL COVERAGE IS NOT LIKELY TO REACH OUTLOOK
CRITERIA.
.BROYLES.. 01/21/2008
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