Small Craft Advisory 13, NWS Seattle, WA

034 
WHUS76 KSEW 210444
MWWSEW

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
844 PM PST SUN JAN 20 2013

PZZ130-150-211245-
/O.CON.KSEW.SC.Y.0013.000000T0000Z-130121T1800Z/
WEST ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA-
COASTAL WATERS FROM CAPE FLATTERY TO JAMES ISLAND OUT 10 NM-
844 PM PST SUN JAN 20 2013

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
MONDAY...

* WIND AND WAVES...EAST WIND 15 TO 25 KNOTS WITH 2 TO 4 FOOT 
  WIND WAVES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$


WWW.WEATHER.GOV/SEATTLE

468 
WHUS76 KSEW 211035
MWWSEW

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
235 AM PST MON JAN 21 2013

PZZ130-150-211800-
/O.CON.KSEW.SC.Y.0013.000000T0000Z-130121T1800Z/
WEST ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA-
COASTAL WATERS FROM CAPE FLATTERY TO JAMES ISLAND OUT 10 NM-
235 AM PST MON JAN 21 2013

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING...

* WIND AND WAVES...EAST WIND 15 TO 25 KNOTS WITH 2 TO 4 FOOT 
  WIND WAVES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$


WWW.WEATHER.GOV/SEATTLE

747 
WHUS76 KSEW 211615
MWWSEW

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
815 AM PST MON JAN 21 2013

PZZ130-150-212000-
/O.EXT.KSEW.SC.Y.0013.000000T0000Z-130121T2000Z/
WEST ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA-
COASTAL WATERS FROM CAPE FLATTERY TO JAMES ISLAND OUT 10 NM-
815 AM PST MON JAN 21 2013

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL NOON PST TODAY...

* WIND AND WAVES...EAST WIND 15 TO 25 KNOTS WITH 2 TO 4 FOOT 
  WIND WAVES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$


WWW.WEATHER.GOV/SEATTLE

636 
WHUS76 KSEW 212029
MWWSEW

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
1229 PM PST MON JAN 21 2013


PZZ130-150-220430-
/O.EXP.KSEW.SC.Y.0013.000000T0000Z-130121T2000Z/
/O.NEW.KSEW.SC.Y.0014.130121T2029Z-130122T1200Z/
WEST ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA-
COASTAL WATERS FROM CAPE FLATTERY TO JAMES ISLAND OUT 10 NM-
1229 PM PST MON JAN 21 2013

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 AM PST TUESDAY...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A SMALL CRAFT
ADVISORY...WHICH IS IN EFFECT UNTIL 4 AM PST TUESDAY. 

* WIND AND WAVES...EAST WIND 15 TO 25 KNOTS WITH 2 TO 4 FOOT 
  WIND WAVES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS
ARE EXPECTED TO PRODUCE HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT.
INEXPERIENCED MARINERS...ESPECIALLY THOSE OPERATING SMALLER
VESSELS SHOULD AVOID NAVIGATING IN THESE CONDITIONS.

&&

$$


WWW.WEATHER.GOV/SEATTLE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
904 AM PST SUN JAN 20 2013

.SYNOPSIS...A STRONG UPPER LEVEL RIDGE WILL REMAIN OVER THE PACIFIC
NORTHWEST THROUGH TUESDAY MORNING PRODUCING DRY AND MAINLY COOL
WEATHER WITH AREAS OF FOG. THE STABLE ATMOSPHERIC CONDITIONS WILL
CAUSE AIR STAGNATION WHICH MAY CAUSE AIR QUALITY TO DETERIORATE AT
TIMES. THE NEXT FRONTAL SYSTEM WILL BRING RAIN TO THE AREA TUESDAY
NIGHT AND WEDNESDAY. AN ACTIVE WEATHER PATTERN WILL BRING PERIODS OF
RAIN OR SHOWERS THROUGH NEXT WEEKEND.

&&

.SHORT TERM...THE STRONG UPPER LEVEL RIDGE ACROSS THE PAC NW WILL
CONTINUE TO DOMINATE THE WEATHER PATTERN THROUGH TUESDAY. THIS RIDGE
WILL MAINTAIN A STABLE PATTERN WITH A STRONG LOW LEVEL TEMPERATURE
INVERSION CAPPING THE REGION. THE INTERIOR LOWLANDS WILL SEE MORE
FOGGY/CLOUDY CONDITIONS TODAY. UPDATED THE FORECAST THIS MORNING TO
MATCH WHAT WE SAW YESTERDAY...TEMPS MAINLY IN THE LOWER TO MID 30S
ALONG THE I-5 CORRIDOR. THE CENTRAL COAST IS SEEING SOME STRATUS
BUT OTHERWISE IT IS A REPEAT OF WHAT WE HAVE BEEN SEEING. THE
AIR STAGNATION ADVISORY REMAINS IN EFFECT FOR MUCH OF THE LOWLANDS.
IT WILL BE ANOTHER GLORIOUS DAY IN THE MOUNTAINS...SUNNY AND MILD.
THIS TREND WILL REPEAT ON MARTIN LUTHER KING JR DAY.

THIS STAGNANT PATTERN WILL START TO BREAKDOWN ON TUES AS THE RIDGE
FINALLY EXITS. THIS WILL WEAKEN THE INVERSION AND THE LOW LEVEL AIR
MASS WILL START TO MIX OUT. A COLD FRONT WILL MOVE INLAND TUE NIGHT
BRINGING WIDESPREAD RAIN TO THE AREA. ONSHORE FLOW WILL INCREASE
WITH TEMPS REMAINING ABOVE FREEZING. SNOW LEVEL WILL LOWER TO AROUND
3000 FT WITH A FEW INCHES OF SNOW AT THE MOUNTAIN PASSES. 33

.LONG TERM...PREVIOUS DISCUSSION...BOTH THE GFS AND ECMWF HAVE THE
TRAILING UPPER LEVEL TROUGH CROSSING W WA WEDNESDAY FOR RAIN
CHANGING TO SHOWERS. AFTER A SHORT DRYISH PERIOD BETWEEN
SYSTEMS...THE NEXT WARM FRONT SHOULD ARRIVE SOMETIME THURSDAY.
MODELS DIFFER A LITTLE ON JUST WHERE THE STRONGEST WARM ADVECTION
WILL GO...BUT BOTH SUGGEST LIGHT RAIN DEVELOPING THURSDAY THEN
INCREASING THURSDAY NIGHT. MODELS DETAILS DIVERGE FRIDAY AND
SATURDAY BUT SOME RAIN WILL BE IN THE FORECAST BOTH DAYS. KAM

&&

.HYDROLOGY...FLOODING IS NOT EXPECTED FOR THE NEXT 7 DAYS.

&&

.AVIATION...AN UPPER RIDGE OVER THE EASTERN PACIFIC WILL MOVE OVER
WESTERN WASHINGTON TONIGHT WITH NORTHWEST FLOW ALOFT BECOMING WEST.
AT THE SURFACE HIGHER PRESSURE OVER EASTERN WASHINGTON WILL PROVIDE
CONTINUED LIGHT OFFSHORE FLOW. AIR MASS IS STABLE WITH WIDESPREAD
LOW CLOUDS AND FOG OVER THE INTERIOR LOWLANDS AND MAINLY CLEAR SKIES
ELSEWHERE.

TODAY LOOKS LIKE A PERSISTENCE FORECAST WITH A STRONG INVERSION
TRAPPING LOW LEVEL MOISTURE NEAR THE SURFACE. THERE WILL LIKELY BE
SOME BURNOFF THIS AFTERNOON OVER THE NORTH INTERIOR...STRAIT OF JUAN
DE FUCA...AND CHEHALIS GAP...BUT MOST OF THE INTERIOR WILL STAY
SOCKED IN ALL DAY WITH ONLY MINOR IMPROVEMENT IN THE AFTERNOON.

KSEA...NO MECHANISM IS AVAILABLE TO LIFT OR DISPERSE THE FOG SO WILL
KEEP IT IN THE TAF THROUGH TONIGHT. LIGHT WIND. CHB

&&

.MARINE...HIGH PRESSURE OVER THE REGION WILL KEEP GRADIENTS LIGHT
AND WEAKLY OFFSHORE THROUGH MONDAY. WINDS WILL BE LIGHT EXCEPT FOR
THE STRAIT OF JUAN DE FUCA WEST ENTRANCE WHERE THEY WILL REMAIN AT
SMALL CRAFT ADVISORY STRENGTH THIS MORNING.

A FRONT IS FORECAST TO APPROACH THE AREA TUESDAY AND MOVE INLAND ON
WEDNESDAY. SMALL CRAFT ADVISORIES ARE LIKELY WITH THIS SYSTEM. CHB

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...AIR STAGNATION ADVISORY REMAINS IN FOR MUCH OF THE INTERIOR
     LOWLANDS UNTIL NOON TUESDAY.

PZ...SMALL CRAFT ADVISORY WEST ENTRANCE AND NORTH INNER COAST.

WWW.WEATHER.GOV/SEATTLE

YOU CAN SEE AN ILLUSTRATED VERSION OF THE FORECAST DISCUSSION AT
WWW.WEATHER.GOV/SEATTLE/GAFD/LATEST_WEBAFD.HTML.