Small Craft Advisory 975, NWS Seattle, WA

797 
WHUS76 KSEW 012137
MWWSEW

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
237 PM PDT TUE MAY 1 2012

PZZ130-150-153-156-170-173-176-020545-
/O.CAN.KSEW.SC.Y.0975.000000T0000Z-120501T2200Z/
/O.NEW.KSEW.SW.Y.0039.120501T2137Z-120502T0600Z/
WEST ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA-
COASTAL WATERS FROM CAPE FLATTERY TO JAMES ISLAND OUT 10 NM-
COASTAL WATERS FROM JAMES ISLAND TO POINT GRENVILLE OUT 10 NM-
COASTAL WATERS FROM POINT GRENVILLE TO CAPE SHOALWATER OUT 10 NM-
WATERS FROM CAPE FLATTERY TO JAMES ISLAND 10 TO 60 NM-
WATERS FROM JAMES ISLAND TO POINT GRENVILLE 10 TO 60 NM-
WATERS FROM POINT GRENVILLE TO CAPE SHOALWATER 10 TO 60 NM-
237 PM PDT TUE MAY 1 2012

...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS IN EFFECT UNTIL 11 PM
PDT THIS EVENING...
...SMALL CRAFT ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A SMALL CRAFT
ADVISORY FOR HAZARDOUS SEAS...WHICH IS IN EFFECT UNTIL 11 PM PDT
THIS EVENING. THE SMALL CRAFT ADVISORY HAS BEEN CANCELLED. 

* SEAS/SWELLS...WEST SWELL 10 FEET THIS EVENING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS MEANS THAT WAVES WILL
BE HAZARDOUS TO SMALL CRAFT. MARINERS SHOULD AVOID SHOALING
AREAS. LONG PERIOD SWELL CAN SHARPEN INTO LARGE BREAKING WAVES IN
SHOALING AREAS. IT IS NOT UNUSUAL FOR WAVES TO BREAK MUCH FARTHER
FROM SHOALING AREAS THAN IS NORMALLY EXPERIENCED. REMEMBER...
BREAKING WAVES CAN EASILY CAPSIZE EVEN LARGER VESSELS.

&&

$$

PZZ133-012245-
/O.CAN.KSEW.SC.Y.0973.000000T0000Z-120501T2200Z/
NORTHERN INLAND WATERS INCLUDING THE SAN JUAN ISLANDS-
237 PM PDT TUE MAY 1 2012

...SMALL CRAFT ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS CANCELLED THE SMALL
CRAFT ADVISORY. 

WINDS TONIGHT ARE EXPECTED TO BE SOUTHWEST 10 TO 20 KNOTS WITH
WIND WAVES 1 TO 3 FEET.

$$

PZZ110-020545-
/O.EXT.KSEW.RB.Y.0019.000000T0000Z-120502T1000Z/
GRAYS HARBOR BAR-
237 PM PDT TUE MAY 1 2012

...SMALL CRAFT ADVISORY FOR ROUGH BAR NOW IN EFFECT UNTIL 3 AM
PDT WEDNESDAY...

* BAR CONDITION...ROUGH WITH BREAKERS POSSIBLE.

* COMBINED SEAS...10 FEET THIS EVENING SUBSIDING TO 7 FEET
  WEDNESDAY.

* FIRST EBB...2 AM WEDNESDAY.

* SECOND EBB...215 PM WEDNESDAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY FOR ROUGH BAR MEANS THAT WAVE CONDITIONS
WILL BE HAZARDOUS TO SMALL CRAFT IN OR NEAR HARBOR ENTRANCES.

&&

$$

PZZ131-132-020545-
/O.EXT.KSEW.SC.Y.0973.000000T0000Z-120502T1000Z/
CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-
EAST ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA-
237 PM PDT TUE MAY 1 2012

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 3 AM PDT WEDNESDAY...

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

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.

&&

$$

PZZ135-020400-
/O.EXT.KSEW.SC.Y.0973.000000T0000Z-120502T0400Z/
PUGET SOUND AND HOOD CANAL-
237 PM PDT TUE MAY 1 2012

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 9 PM PDT THIS
EVENING...

* WIND AND WAVES...SOUTHWEST WIND 15 TO 25 KNOTS WITH WIND WAVES
  OF 2 TO 4 FEET...EASING LATER THIS EVENING.

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
320 AM PDT TUE MAY 1 2012

.SYNOPSIS...A LOW PRESSURE SYSTEM OFFSHORE WILL CONTINUE MOVING EAST
DURING THE DAY TODAY AND THIS WILL RESULT IN AN UPSWING IN SHOWERS
THIS AFTERNOON. THE LOW PRESSURE SYSTEM WILL EXIT THE AREA LATER
TONIGHT AND WILL BE FOLLOWED BY WEAK HIGH PRESSURE ALOFT. ANOTHER
LOW PRESSURE SYSTEM WILL AFFECT THE REGION ON THURSDAY.

&&

.SHORT TERM...
THERE WERE SCATTERED SHOWERS OVER THE CWA EARLY THIS MORNING. MOST
OF THE ACTIVITY WAS OVER THE COAST AND CASCADES. NOT MUCH CHANGE IN
THE AREAL COVERAGE IS EXPECTED THROUGH THIS MORNING.

AN UPPER TROF OFFSHORE WILL CONTINUE MOVING EAST DURING THE DAY
TODAY...RESULTING IN AN UPSWING IN SHOWERS ACROSS THE AREA THIS
AFTERNOON. THE TROF WILL MOVE ACROSS THE AREA TONIGHT AND WILL BE
OVER EASTERN WA BY SUNRISE WED. ANTICIPATE THE SHOWER THREAT TO
RAPIDLY DIMINISH TONIGHT BEHIND THE UPPER TROF AXIS.

A WEAK UPPER RIDGE WILL PREVAIL OVER THE REGION ON WED. ONSHORE FLOW
WILL ALSO PERSIST FOR A LOW THREAT OF SHOWERS OVER THE CWA. THE BEST
CHANCE WILL BE OVER THE MOUNTAINS.

THE TREND IN THE MODELS WAS TO NOT ONLY SLOW DOWN THE THU SYSTEM BUT
TO ALSO TAKE IT FARTHER SOUTH. HAD NO REASON TO DISAGREE WITH THIS
IDEA...THEREFORE DRASTICALLY CUT BACK POPS FOR WED NIGHT. A WEAK
UPPER TROF WILL BE OVER THE PAC NW ON THU...THUS KEPT HIGH POPS OVER
THE MOUNTAINS AND SOUTHERN FORECAST ZONES.

.LONG TERM...
AN UPPER TROF WILL DOMINATE THE WEATHER PICTURE FOR THE FIRST HALF
OF THIS PERIOD FOR A CONTINUED RISK OF SHOWERS. HOWEVER THE THREAT
OF SHOWERS WILL DECREASE WITH TIME AS THE UPPER TROF MOVES FARTHER
AWAY FROM THE REGION.

ANTICIPATE AN UPPER RIDGE TO MOVE OVER THE PAC NW ON SUNDAY...
CONTINUING ON MON. THE CURRENT FORECAST HAS A SLIGHT CHANCE OF
SHOWERS OVER THE MOUNTAINS BUT SUNDAY AND MON MIGHT END UP BEING
DRY FOR THE ENTIRE CWA.

&&

.AVIATION...WESTERLY FLOW ALOFT WILL GIVE WAY TO AN UPPER LEVEL
TROUGH THIS AFTERNOON. AT THE SURFACE MODERATE ONSHORE SOUTHWESTERLY
FLOW WILL SLOWLY DIMINISH TODAY. AIR MASS IS MOIST AND SLIGHTLY
UNSTABLE WITH SCATTERED SHOWERS. A PUGET SOUND CONVERGENCE ZONE IN
THE KNUW-KPAE REGION WILL CONTINUE TODAY.

A CLUSTER OF MVFR CEILINGS 1-2K FT ARE AROUND PUGET SOUND WITH VFR
CEILINGS ELSEWHERE. SHOULD BE SOME IMPROVEMENT AFTER 15Z WITH
CEILINGS CONVERGING AROUND LOW END VFR 3-5K FT AS SHOWERS INCREASE
IN THE AFTERNOON.

KSEA...DISCUSSION ABOVE APPLIES. KSEA SHOULD IMPROVE TO VFR AFTER
15Z BUT STILL HAVE 3-5K FT CEILINGS WITH OCCASIONAL SHOWERS.
SOUTHWEST WIND 15G25 KT SHOULD DIMINISH TO SOMETHING LIKE 10G15KT BY
18Z OR SO. CHB

&&

.MARINE...MODERATE ONSHORE FLOW WILL DIMINISH TODAY. RESIDUAL SMALL
CRAFT ADVISORY WINDS WILL CONTINUE INTO THE MORNING OVER MOST
WATERS...AND INTO THE AFTERNOON IN THE STRAIT. WESTERLY SWELL OF
10-12 FT WILL GIVE A HAZARDOUS SEAS SMALL CRAFT ADVISORY TO THE
COAST AND WEST ENTRANCE TODAY AND THIS EVENING.

HIGH PRESSURE WILL BUILD OVER THE AREA WEDNESDAY WITH LIGHTER WINDS.
A LOW PRESSURE CENTER WILL MOVE INTO OREGON THURSDAY GIVING MAINLY
NORTH WINDS OVER WESTERN WASHINGTON. MODERATE ONSHORE FLOW WILL
RETURN FRIDAY AND SATURDAY.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...SMALL CRAFT ADVISORIES ARE IN EFFECT FOR THE COASTAL WATERS...
     NORTHERN INLAND WATERS...PUGET SOUND/HOOD CANAL...AND STRAIT
     OF JUAN DE FUCA.

     SMALL CRAFT ADVISORY FOR ROUGH BAR UNTIL 11 PM PDT TONIGHT
     FOR THE GRAYS HARBOR BAR.

&&

WWW.WEATHER.GOV/SEATTLE

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