NOUS70 KSEW 122320
OEPZSE
TERMINAL FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CWSU AUBURN WA
300 PM PST THU FEB 12 2009
.DISCUSSION...
A STACKED LOW OFF THE PACIFIC NORTHWEST COAST WILL CONTINUE TO MOVE 
TOWARD THE SOUTHWEST OREGON COAST THROUGH TOMORROW AFTERNOON.  A 
FRONT WILL GRADUALLY PUSH ONSHORE IN SOUTHWEST OREGON TONIGHT.  AT 
SEA...CEILINGS GENERALLY SHOULD BE 100 OR HIGHER THROUGH THE 
FORECAST PERIOD WITH WINDS SHIFTING TO THE NORTHEAST 5-10 KNOTS.  
THERE WILL BE A SLIGHT CHANCE FOR SHOWERS TO REACH SEA MAINLY DURING 
THE MORNING FRIDAY.  AT PDX...WINDS WILL REMAIN FROM THE 
EAST-SOUTHEAST...BECOMING GUSTY THIS EVENING.  PRECIP SHOULD DEVELOP 
AFTER 02Z AND REMAIN LIQUID AT PDX...ALTHOUGH SOME HIGHER ELEVATIONS 
AROUND PORTLAND WILL SEE SNOWFALL TONIGHT.  CEILINGS GENERALLY 
SHOULD BE IN THE 030-040 RANGE THIS EVENING THROUGH MID-MORNING.  JMV
&&
KSEA CURRENT ARRIVAL RATE...48 SOUTH FLOW
KSEA WX DELAYS....NONE
IMPORTANT NUMBERS FOR KSEA....
CIG/WX          VSBY   AAR     IMPACT
>6000           >10    48-52   NO ARTCC PROBLEMS 
4100-6000       >6     44-46   LMTD VAPS (METER DELAYS) 
3000-4000       >6     40-44   LMTD/NO VAPS (TMA, CFR) 
1000-3000       >6     40-44   NO VAPS (TMA, CFR AND/OR GDP) 
100-900         1-5    30-38   MOD DELAYS (TMA, CFR, AND/OR GDP) 
<100            <1     28-30   MAJOR DELAYS (TMA, CFR, AND/OR GDP) 
FZRA/FZDZ/SN           00-28   MAJOR DELAYS FOR PLOWING/DEICING 
                               (TMA,CFR, AND/OR GDP) 
TSRA                           VRBL DELAYS (TMA,CFR,GS AND/OR GDP) 
WINDS(2-6K)>30KT       24-32   MAJOR DELAYS (TMA,CFR AND/OR GDP) 
WINDSHIFTS                     20MIN DELAYS/RWY SWITCH/FLOW CHG 
&&
KPDX CURRENT ARRIVAL RATE...48 EAST FLOW 
KPDX WX DELAYS....NONE
IMPORTANT NUMBERS FOR KPDX....
CIG/WX          VSBY   AAR     IMPACT
>4100           >6     60      NO ARTCC PROBLEMS 
1000-4000       >6     40      LMTD/NO VAPS (TMA,CFR AND/OR GDP) 
100-900         >1-5   24      MOD DELAYS (TMA,CFR AND/OR GDP) 
<100            <1     24      MOD DELAYS (TMA,CFR AND/OR GDP)      
FZRA/FZDZ/SN           20      MAJOR DELAYS FOR PLOWING/DEICING      
                               (TMA,CFR, AND/OR GDP) 
TSRA                           VRB DELAYS (TMA,CFR,GS AND/OR GDP) 
SFC WD 170-230 DEG,    32      MOD DELAYS (TMA,CFR AND/OR GDP) 
WS>20KT, CIG>=4000 FT
SFC WD 170-230 DEG,    24      MOD DELAYS (TMA,CFP AND/OR GDP) 
WS>20KT, CIG<4000 FT 
SFC WINDSHIFTS                 10MIN DELAYS/RWY SWITCH/FLOW CHG
STG E SFC WINDS WITH   48      PSBL MINOR DELAYS
STG S-SW WINDS ABV
1500 FT AGL  
&&
MIT=MILES IN TRAIL   GDP=GROUND DELAY PROGRAM   GS=GROUND STOP
CFR=CALL FOR RELEASE   TMA=TRAFFIC MANAGEMENT ADVISOR
VAPS=VISUAL APPROACHES
$$
END