SWODY1
SPC AC 141941
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0141 PM CST TUE DEC 14 2010
VALID 142000Z - 151200Z
...NO SVR TSTM AREAS FORECAST...
...WEST OF THE WA/ORE CASCADES...
LATE MORNING/EARLY AFTERNOON VISIBLE SATELLITE IMAGERY SHOWED OPEN
CU FIELD EXTENDING FROM OFFSHORE WA/ORE TO AREAS INLAND ALONG AND
WEST OF THE CASCADES. AIR MASS WILL REMAIN MARGINALLY UNSTABLE FOR
UPDRAFTS TO REACH EQUILIBRIUM TEMPERATURES COLD ENOUGH FOR CHARGE
SEPARATION THROUGH AT LEAST THIS AFTERNOON. PREVIOUS FORECAST
REMAINS ON TRACK...WITH NO CHANGES NEEDED.
..PETERS.. 12/14/2010
.PREV DISCUSSION... /ISSUED 1019 AM CST TUE DEC 14 2010/
COLD UPPER TROUGH MOVING INLAND ACROSS PAC NW TODAY...MAINTAINING
ONSHORE FLOW OF A MOIST/MARGINALLY UNSTABLE AIR MASS. SCATTERED LOW
TOPPED CONVECTION...OCCASIONALLY IN BANDS WILL PERSIST FROM THE
COAST INLAND TO CASCADES UNTIL THIS EVENING WHEN ONSHORE FLOW
WEAKENS. ALTHOUGH LAPSE RATES ARE STEEP...MLCAPES GENERALLY LESS
THAN 100 J/KG WHICH WILL LIMIT THE DEPTH OF CONVECTIVE CELLS AND
RISK OF LIGHTNING. THERE COULD BE DEEPER CONVECTION AND GREATER
CHANCE OF THUNDER THIS AFTERNOON IF A PSCZ IS ABLE TO DEVELOP AS
BOUNDARY LAYER WESTERLIES INCREASE THRU THE STRAIT OF JUAN DE FUCA.
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