SWOD48
SPC AC 060850
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0250 AM CST TUE JAN 06 2009
VALID 091200Z - 141200Z
...DISCUSSION...
LATEST MEDIUM-RANGE GUIDANCE REMAINS IN GENERALLY GOOD AGREEMENT IN
THE EVOLUTION OF THE LARGE-SCALE PATTERN THROUGH THE EXTENDED
PERIOD. THE NEXT UPSTREAM TROUGH INITIALLY OVER THE INTERMOUNTAIN
WEST ON D4 /FRI JAN 9TH/ WILL AMPLIFY AND PHASE WITH ADDITIONAL
HIGHER LATITUDE IMPULSES TO FORM A LARGE TROUGH E OF THE ROCKIES BY
THE END OF THE FORECAST PERIOD.
IN THE LOW LEVELS...A STRONG COLD FRONT WILL SURGE SEWD THROUGH THE
GREAT PLAINS AND UPPER GREAT LAKES ON D4...AND EVENTUALLY THE
REMAINDER OF THE CONUS EXCEPT THE FL PENINSULA BY THE END OF D5 /SAT
JAN 10TH/. THIS FRONT WILL ENCOUNTER A MOIST AIR MASS OVER ERN
PARTS OF THE SRN PLAINS EWD ALONG THE GULF COAST STATES WHERE TSTMS
ARE POSSIBLE. HOWEVER...GIVEN THE ANAFRONTAL CHARACTER OF AIR FLOW
REGIME AND MARGINAL QUALITY OF MOISTURE/INSTABILITY FORECAST AHEAD
OF THE FRONT...NO ORGANIZED SEVERE WEATHER EPISODE APPEARS LIKELY
ATTM.
..MEAD.. 01/06/2009
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