SPC AC 211950
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0150 PM CST MON DEC 21 2009
VALID 212000Z - 221200Z
...NO TSTM AREAS FORECAST...
PREVIOUS FORECAST REMAINS ON TRACK WITH NO GENERAL TSTM AREAS NEEDED
THIS FORECAST PERIOD.
..PETERS.. 12/21/2009
.PREV DISCUSSION... /ISSUED 1016 AM CST MON DEC 21 2009/
...SYNOPSIS/FORECAST...
LARGELY ZONAL FLOW WILL PREVAIL FROM THE PLNS TO THE E CST THIS
PERIOD...DOWNSTREAM FROM COMPLEX UPR TROUGH AMPLIFYING SE ACROSS THE
PACIFIC NW/NRN SIERRA. POLAR OR MODIFIED ARCTIC AIR WILL PERSIST AT
LWR LVLS OVER MOST OF THE NATION...PRECLUDING THE DEVELOPMENT OF
DEEP MOIST CONVECTION.
RELATIVELY STEEP MID LVL LAPSE RATES WILL ACCOMPANY NRN PART OF THE
UPR SYSTEM AFFECTING THE NWRN STATES...WITH MAIN AXIS OF ELEVATED
INSTABILITY NOW OVER THE CASCADES LIKELY TO MOVE/DEVELOP SE INTO THE
SISKIYOU REGION BY THIS EVE. HOWEVER...DEGREE OF ELEVATED
INSTABILITY AND FORCING FOR ASCENT EXPECTED TO BE TOO LIMITED TO
SUPPORT MORE THAN AN ISOLD LIGHTNING STRIKE OR TWO.
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0100Z
|
