Wind Advisory 12, NWS Seattle, WA

131 
WWUS76 KSEW 251812
NPWSEW

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
1112 AM PDT MON APR 25 2011

WAZ504-505-507>509-511-512-251915-
/O.CAN.KSEW.WI.Y.0012.110425T1900Z-110426T0400Z/
SOUTHWEST INTERIOR-EAST PUGET SOUND LOWLANDS-EVERETT AND VICINITY-
SEATTLE/BREMERTON AREA-TACOMA AREA-HOOD CANAL AREA-
LOWER CHEHALIS VALLEY AREA-
1112 AM PDT MON APR 25 2011

...WIND ADVISORY IS CANCELLED FOR WESTERN WASHINGTON...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS CANCELLED THE WIND
ADVISORY FOR THE WESTERN WASHINGTON.

SOUTHERLY WINDS WILL INCREASE THIS EVENING BUT ARE UNLIKELY TO
REACH WIND ADVISORY CRITERIA. SOME AREAS...NOTABLY THE SEATTLE
AREA SOUTHWARD...COULD GET WINDY CONDITIONS...20 TO 30 MPH WINDS
WITH GUSTS TO 45 MPH. OTHER AREAS...SUCH AS THE NORTHWEST
INTERIOR...COULD GET BREEZY. HOWEVER WINDS ARE UNLIKELY TO GET ANY
STRONGER. THE WIND ADVISORY HAS BEEN CANCELLED.

$$
BURKE
WWW.WEATHER.GOV/SEATTLE

222 
WWUS76 KSEW 251816 CCA
NPWSEW

URGENT - WEATHER MESSAGE...CORRECTED
NATIONAL WEATHER SERVICE SEATTLE WA
1116 AM PDT MON APR 25 2011

MINOR WORDING CORRECTION.

WAZ504-505-507>509-511-512-251930-
/O.COR.KSEW.WI.Y.0012.110425T1900Z-110426T0400Z/
SOUTHWEST INTERIOR-EAST PUGET SOUND LOWLANDS-EVERETT AND VICINITY-
SEATTLE/BREMERTON AREA-TACOMA AREA-HOOD CANAL AREA-
LOWER CHEHALIS VALLEY AREA-
1116 AM PDT MON APR 25 2011

...WIND ADVISORY IS CANCELLED FOR WESTERN WASHINGTON...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS CANCELLED THE WIND
ADVISORY FOR WESTERN WASHINGTON.

SOUTHERLY WINDS WILL INCREASE THIS EVENING BUT ARE UNLIKELY TO
REACH WIND ADVISORY CRITERIA. SOME AREAS...NOTABLY THE SEATTLE
AREA SOUTHWARD...COULD GET WINDY CONDITIONS...20 TO 30 MPH WINDS
WITH GUSTS TO 45 MPH. OTHER AREAS...SUCH AS THE NORTHWEST
INTERIOR...COULD GET BREEZY. HOWEVER WINDS ARE UNLIKELY TO GET ANY
STRONGER. THE WIND ADVISORY HAS BEEN CANCELLED.

$$
BURKE
WWW.WEATHER.GOV/SEATTLE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
910 PM PDT SUN APR 24 2011

.SYNOPSIS...A FRONTAL SYSTEM WILL BRING MORE RAIN MONDAY. WEAK HIGH
PRESSURE WILL PROVIDE A RELATIVE BREAK IN THE WET PATTERN TUESDAY
AND WEDNESDAY. AN UPPER LOW WILL MOVE THROUGH WEDNESDAY NIGHT AND
THURSDAY WITH RAIN AND MOUNTAIN SNOW. A DRYING AND WARMING TREND IS
EXPECTED BY NEXT WEEKEND AS AN UPPER RIDGE MOVES OVER THE AREA.

&&

.SHORT TERM...AN UPPER LEVEL TROUGH AXIS WILL CONTINUE LIFTING N/NE
THROUGH THE REGION THIS EVENING...GENERATING A FEW SHOWERS ACROSS W
WA. KATX SHOWS THE BULK OF THE ACTIVITY OVER THE NORTH INTERIOR AND
INTO THE CASCADES. CELLS ARE MOVING TOWARD THE N/NE AT A PRETTY GOOD
CLIP...BUT WILL DROP A FEW HUNDREDTHS /MAYBE UP TO A TENTH/ PRECIP.

RAIN WILL INCREASE EARLY MON MORNING AS OUR NEXT SYSTEM ARRIVES.
THIS SYSTEM WILL BE STRONGER AND WETTER WITH PRECIP AFFECTING MUCH
OF THE CWA THROUGHOUT THE DAY. THE SURFACE LOW WILL MOVE INLAND
DURING THE AFTERNOON...WITH BREEZY TO WINDY S/SW WINDS DEVELOPING.
THE INTERIOR WILL LIKELY SEE BREEZY SOUTH WINDS LATE MON AFTERNOON
AS THE FRONT PASSES THROUGH. ONSHORE FLOW REMAINS STRONG MON NIGHT
WITH SHOWERS MAINLY AFFECTING THE COAST AND MOUNTAINS. MAY NEED A
WINTER WEATHER ADVISORY FOR THE CASCADES...SNOW LEVELS DOWN TO 3000
FT.

ONSHORE FLOW CONTINUES INTO TUE WITH SCATTERED SHOWERS EXPECTED.
TEMPS WILL REMAIN BELOW NORMAL WITH HIGHS ONLY IN THE LOWER TO MID
50S. ANOTHER SYSTEM WILL NUDGE INTO THE PAC NW ON WED...PROLONGING
OUR COOL AND SHOWERY PATTERN. 33

.LONG TERM...PREVIOUS DISCUSSION...A FAIRLY VIGOROUS UPPER TROUGH
AND FRONTAL SYSTEM WILL MOVE ACROSS THE REGION WEDNESDAY NIGHT AND
THURSDAY. THERE SHOULD BE A GOOD SHOT OF RAIN WITH THIS SYSTEM ALONG
WITH BREEZY CONDITIONS AT TIMES. THERE COULD ALSO BE A FAIR AMOUNT
OF SNOW IN THE MOUNTAINS WITH LOW SNOW LEVELS FOR LATE APRIL. AN
UPPER RIDGE WILL BEGIN BUILDING IN FROM THE WEST ON FRIDAY HERALDING
THE START OF A DRYING TREND. LONG RANGE MODELS ARE IN FAIR AGREEMENT
SHOWING AN UPPER RIDGE BUILDING OVER THE AREA NEXT WEEKEND. KEPT A
CHANCE OF SHOWERS INTO SATURDAY AND THEN WENT FOR A DRY SUNDAY.
THERE IS SOME UNCERTAINTY ABOUT HOW STRONG THE RIDGE WILL BE BUT
WANTED TO HAVE A LEAST ONE DRY DAY INDICATED. HIGHS SHOULD ALSO WARM
TO NEAR NORMAL BY SUNDAY. SCHNEIDER

&&

.AVIATION...SOUTHWEST FLOW ALOFT OVER WESTERN WASHINGTON THIS
EVENING WITH A WEAK UPPER TROUGH MOVING NORTHEAST OF THE AREA.
ANOTHER FRONT AND ITS UPPER TROUGH WILL APPROACH THE FORECAST AREA
FROM THE SOUTHWEST TONIGHT AND MOVE INLAND MONDAY. THE AIR MASS WILL
REMAIN MOIST.

WE HAVE VFR AND LOCAL MVFR CONDITIONS AND SCATTERED SHOWERS ACROSS
WESTERN WASHINGTON AT 8 PM WITH CLOUD COVER SCT-BKN030 BKN050
BKN-OVC060-090. THAT SHOULD REMAIN THE PREVAILING CONDITION TONIGHT
AND MONDAY MORNING. RAIN ASSOCIATED WITH THE INCOMING UPPER TROUGH
WILL SPREAD ACROSS THE FORECAST AREA FROM THE SOUTHWEST MONDAY
MORNING AND AFTERNOON...WITH CONDITIONS DETERIORATING MVFR AND LOCAL
IFR.

KSEA...SOUTHWEST WIND 8-12 KT...BACKING TO SOUTHEAST 4-10 AFTER
MIDNIGHT...THE BECOMING SOUTHWEST 14-22 KT MONDAY AFTERNOON.
MCDONNAL

&&

.MARINE...WEAK HIGH PRESSURE OVER WESTERN WASHINGTON WILL SHIFT EAST
OF THE CASCADES TONIGHT...AS ANOTHER FRONT APPROACHES THE FORECAST
AREA FROM THE SOUTHWEST. THAT FRONT WILL MOVE INTO THE COASTAL
WATERS MONDAY MORNING AND INLAND IN THE AFTERNOON...WITH HIGH
PRESSURE BUILDING OVER THE AREA FROM THE SOUTH IN THE WAKE OF THE
FRONT. THE COMBINATION OF THE FRONT AND HIGH PRESSURE BUILDING IN
ITS WAKE WILL PRODUCE WIDESPREAD SMALL CRAFT ADVISORY WINDS OVER THE
COASTAL AND INLAND WATERS.

WEAK HIGH PRESSURE WILL SIT OVER THE REGION TUESDAY AND WEDNESDAY...
WITH ONSHORE FLOW DEVELOPING EACH DAY IN THE AFTERNOON AND EVENING
HOURS. ANOTHER FRONT OR TROUGH WILL MOVE THROUGH THE REGION
WEDNESDAY NIGHT AND THURSDAY...WITH HIGH PRESSURE BUILDING OFFSHORE
ON FRIDAY.   MCDONNAL

&&

.AVALANCHE...THE NEXT STRONGER FRONT MONDAY SHOULD CAUSE THE
STRONGEST WINDS AND HEAVIEST SNOW IN THE SOUTH CASCADES AND MT HOOD
AREA. QUITE A LATE WINTER WE ARE HAVING IN THE NORTHWEST. ABOUT 10
INCHES OF NEW SNOW SHOULD BE SEEN AT HIGHER ELEVATIONS FROM ABOUT
MT RAINIER SOUTH. THIS IS EXPECTED TO BUILD NEW WIND OR TEMPORARY
STORM SLAB LAYERS ON LEE SLOPES. LATE APRIL SUN EFFECTS ARE LIKELY
TO HELP ACTIVATE NEW SNOW ON OTHER ASPECTS AS WELL. BACK COUNTRY
TRAVEL IS NOT RECOMMENDED NEAR AND WEST OF THE CREST MT RAINIER
SOUTH ON MONDAY. CAREFUL SNOW PACK EVALUATION IS LIKELY TO BE
REQUIRED IN OTHER AREAS. PLEASE SEE NWAC.US FOR DETAILS. FERBER

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...SMALL CRAFT ADVISORY ALL WATERS.

WWW.WEATHER.GOV/SEATTLE