[SWODY1] SWODY1

[Severe Weather Outlook Day 1]

ACUS01 KWNS 200521
SWODY1
SPC AC 200519

DAY 1 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK
1119 PM CST MON DEC 19 2005

VALID 201200Z - 211200Z

GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 60 NW BLI 45 NNW PDX
35 SSE SLE 45 NNE MFR 35 SE MFR 35 E RBL 35 WSW TVL 25 NE MER 40 WSW
FAT 30 NNW PRB 55 WSW PRB 90 W VBG.

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...

AMPLIFIED LARGE-SCALE PATTERN WILL CONTINUE THROUGH THE DAY ONE
PERIOD...CHARACTERIZED BY A FULL-LATITUDE RIDGE IN THE W AND SPLIT
FLOW TROUGHING IN THE E.  WRN CONUS RIDGE WILL TEND TO FLATTEN TO
SOME DEGREE AS VIGOROUS SHORTWAVE TROUGH CURRENTLY APPROACHING THE
PACIFIC NW COAST LIFTS NEWD AND DE-AMPLIFIES OVER WRN CANADA.

...WA/ORE COASTS SWD INTO NRN/CNTRL CA...

A POCKET OF COLD MID-LEVEL AIR /I.E. -18 TO -22 C AT 500 MB/ WILL
OVERSPREAD WRN WA/ORE LATER TODAY ON CYCLONIC SIDE OF 70-80 KT
MID-LEVEL JET STREAK LIFTING NEWD ACROSS NRN CA/SRN ORE.  RESULTANT
STEEPENING OF MID-LEVEL LAPSE RATES AND INCREASED LARGE-SCALE
FORCING WILL CONTRIBUTE TO A WEAKLY UNSTABLE ENVIRONMENT...
SUPPORTING ISOLATED TO WIDELY SCATTERED TSTM DEVELOPMENT...
ESPECIALLY THIS AFTERNOON INTO EVENING.  

VERTICAL SHEAR PROFILES WILL ALSO BECOME INCREASINGLY FAVORABLE FOR
ISOLATED SEVERE STORM DEVELOPMENT FROM SAN FRANCISCO BAY AREA INTO
THE CA CNTRL VALLEY...NWD TO THE ORE COAST.  HOWEVER...IT APPEARS
THAT INSTABILITY WILL REMAIN TOO LIMITED TO SUPPORT SUSTAINED
UPDRAFTS IN THE STRONGLY SHEARED ENVIRONMENT.

..MEAD.. 12/20/2005

...NOTICE...
THE STATION RELATIVE POINTS IN THIS PRODUCT WILL BE
DISCONTINUED ON 14 FEBRUARY 2006 BUT WILL REMAIN AVAILABLE
IN THE FOLLOWING PRODUCTS:

   WMO HEADER:       AWIPS ID:
   WUUS01            PTSDY1
   WUUS02            PTSDY2
   WUUS03            PTSDY3

A SERVICE CHANGE NOTICE ...SCN05-39... PROVIDES DETAILS
ON THE TRANSITION. FOR ADDITIONAL DETAILS SEE THE FOLLOWING
WEB ADDRESS USING LOWER CASE LETTERS:
WWW.NWS.NOAA.GOV/OM/NOTIF.HTM