SWOD48
SPC AC 170925
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0325 AM CST SAT JAN 17 2009
VALID 201200Z - 251200Z
...DISCUSSION...
IN MID-UPPER LEVELS...INITIALLY HIGH-AMPLITUDE WRN RIDGE/ERN TROUGH
PATTERN IS FCST TO BREAK DOWN ENOUGH FOR SRN STREAM OF SPLIT FLOW TO
OCCUR ACROSS SWRN/S-CENTRAL CONUS BEYOND DAY-5/21ST-22ND. LEADING
PACIFIC SHORTWAVE TROUGH IN THAT SRN STREAM MAY CROSS PORTIONS SRN
ROCKIES/PLAINS DURING DAYS 6-7/22ND-24TH TIME FRAME.
MEANWHILE...MEAN TROUGHING -- WHILE LOWER IN AMPLITUDE -- WILL
CONTINUE OVER ERN NORTH AMERICA. CONSIDERABLE DIFFERENCES THAT
EXIST AMONG OPERATIONAL PROGS SUCH AS ECMWF/SPECTRAL/UKMET REGARDING
TIMING/STRENGTH OF THAT SHORTWAVE...AND CONCERNS OVER LINGERING
EFFECTS OF ERN MEAN TROUGH ON CONVECTIVE VIABILITY OF LOW LEVEL AIR
MASS....EACH PRECLUDE CATEGORICAL OUTLOOK ATTM.
..EDWARDS.. 01/17/2009
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
To unsubscribe from WX-STORM send e-mail to LISTSERV@LISTSERV.ILLINOIS.EDU with
"unsub wx-storm" in the body of your message. For more information write cnovy@cox.net.
No comments:
Post a Comment