Gale Watch 12, NWS Eureka, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
200 PM PDT MON APR 19 2010

.SYNOPSIS...STRONG LOW PRESSURE WILL BRING RAIN AND HIGH ELEVATION
SNOW TO THE REGION THROUGH TUESDAY. HIGH PRESSURE WILL BUILD BACK
INTO THE REGION BY LATE WEDNESDAY WITH WARMER AND DRIER WEATHER
EXPECTED INTO NEXT WEEKEND.
&&

.DISCUSSION...COLD FRONT WILL CONTINUE TO MOVE STEADILY TOWARDS THE
COAST THIS AFTERNOON AND EVENING. WITH LITTLE ISENTROPIC LIFT AHEAD
OF THE FRONT EXPECT LGT AND SPOTTY PRECIP THROUGH THIS AFTERNOON.
PRECIP CHCS INCREASE LATE THIS AFTERNOON INTO EARLY THIS EVENING AS
A BROAD AREA OF LIFT ASSOCIATED WITH FRONTAL CONVERGENCE REACHES THE
COAST. THIS WILL BRING BRIEF PERIODS OF HEAVIER RAINFALL AT THIS
TIMES WITH SOME OROGRAPHIC ENHANCEMENT ALSO EXPECTED IN THE COASTAL
RANGES. MODELED INSTABILITY PARAMETERS CONTINUE TO SUPPORT ISOLD
TSTMS LATE TONIGHT THROUGH TUE AS THE UPPER LEVEL TROUGH MOVES
ACROSS THE REGION. TOTAL QPF FROM TONIGHT THROUGH TUE EVENING
REMAINS BETWEEN 0.75-1.00 INCH WITH LOCALLY HIGHER AMOUNTS IN THE
FAVORED TERRAIN. SNOW LEVELS CURRENTLY AROUND 7000 FT WILL LOWER TO
AROUND 5500 FT THIS EVENING THEN WILL FALL RAPIDLY TO 3000-3500 FT
EARLY TUESDAY AS THE COLD UPPER LOW PASSES. ACCUMULATIONS OF 2 TO 5
INCHES EXPECTED BY TUE NIGHT ABOVE 4000 FT WITH LESS THAN A COUPLE
OF  INCHES BELOW. MODELS REMAIN IN GOOD AGREEMENT IN CUTTING OFF AN
UPPER LOW OVER THE FOUR CORNERS WITH AN UPPER LEVEL RIDGE BUILDING
OVER THE REGION RESULTING IN DRY AND WARM WX FOR THE LATTER HALF OF
THE WEEK. NORTH WINDS WILL INCREASE BY WED AFTERNOON AS HIGH
PRESSURE OFFSHORE COMBINES WITH A THERMAL TROUGH ACROSS THE INTERIOR
TO TIGHTEN THE PGF ACROSS THE REGION. OUTSIDE OF A STRAY SHOWER NEAR
THE ORCA BORDER OVER THE WEEKEND AS A WEAK DISTURBANCE PASSES TO THE
N...DRY WX WILL PERSIST THROUGH NEXT WEEKEND. BC
&&

.AVIATION...0Z TUESDAY THROUGH 0Z WEDNESDAY...SOUTH WIND PICKING UP
AT THE COASTAL TAF SITES IN ADVANCE OF AN APPROACHING FRONT. BEST
GUESS IS THIS WILL CONTINUE FOR A FEW MORE HOURS BEFORE MVFR
CONDITIONS DUE TO RESTRICTION IN VIS AND PERHAPS CIGS ASSOCIATED
WITH THE FRONT PREVAIL IN THE LATE AFTERNOON. RAIN WILL OVERSPREAD
THE AREA FROM WEST TO EAST EARLY THIS EVENING. WINDS ARE NOT
EXPECTED TO BE STRONG WITH THE FRONTAL PASSAGE AND SHOULD BEGIN TO
TURN TO THE NORTH TOWARD THE END OF THIS TAF CYCLE.
&&

.MARINE...A WEAK COLD FRONT IS CROSSING THE WATERS THIS AFTERNOON,
ACCOMPANIED BY AN INCREASE IN SOUTH WINDS NORTH OF CAPE MENDOCINO
AHEAD OF THE FRONT. HAVE EXTENDED THE SCA A FEW MORE HOURS FOR WINDS
FOR THIS AFTERNOON AND EARLY EVENING. A NW SWELL WILL BUILD TONIGHT
INTO TUESDAY WHILE STRENGTHENING HIGH PRESSURE OVER THE EAST PACIFIC
EXTENDS TOWARD THE COAST TUESDAY INTO WEDNESDAY. THE HIGH WILL
INTERACT WITH THERMAL LOW PRESSURE DEVELOPING OVER CALIFORNIA TO
GENERATE GALE FORCE GUSTS FROM THE NORTH AND STEEP SHORT PERIOD SEAS
LATE WEDNESDAY THROUGH FRIDAY. THE WORST CONDITIONS WILL BE OVER THE
OUTER WATERS. HAVE ISSUED A GALE AND HAZ SEAS WATCH TO ADDRESS THIS
PERIOD OF INCLEMENT WEATHER.
&&

.EKA WATCHES/WARNINGS/ADVISORIES...
SCA UNTIL 7 PM PDT THIS EVENING PZZ450-470.
GALE AND HAZARDOUS SEAS WATCHES FROM WED AFTERNOON THROUGH FRI
AFTERNOON FOR PZZ450-455-470-475.
&&

VISIT US AT HTTP://WWW.WEATHER.GOV/EUREKA

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EUREKA CA
424 AM PDT MON APR 19 2010

CAZ002-201330-
MENDOCINO COAST-
424 AM PDT MON APR 19 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT.

ISOLATED THUNDERSTORMS ARE POSSIBLE LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

ISOLATED THUNDERSTORMS ARE POSSIBLE TUESDAY. A FEW SHOWERS AND
THUNDERSTORMS MAY CONTAIN SMALL HAIL AND BRIEF GUSTY WINDS.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

CAZ001-201330-
REDWOOD COAST-
424 AM PDT MON APR 19 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED TODAY OR TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

ISOLATED THUNDERSTORMS ARE POSSIBLE TUESDAY. A FEW SHOWERS AND
THUNDERSTORMS MAY CONTAIN SMALL HAIL AND BRIEF GUSTY WINDS.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

CAZ003-076-201330-
NORTH COAST INTERIOR-MENDOCINO INTERIOR-
424 AM PDT MON APR 19 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED TODAY OR TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

SNOW LEVELS WILL FALL TO 4000 FEET BY TUESDAY AFTERNOON...WITH A
FEW INCHES OF SNOW ACCUMULATION POSSIBLE BY TUESDAY EVENING. STAY
TUNED TO LATER FORECASTS AND POSSIBLE STATEMENTS OR ADVISORIES.

ISOLATED THUNDERSTORMS MAY ALSO OCCUR TUESDAY. A FEW SHOWERS AND
THUNDERSTORMS MAY CONTAIN SMALL HAIL AND BRIEF GUSTY WINDS.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

CAZ004-201330-
UPPER TRINITY RIVER-
424 AM PDT MON APR 19 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED TODAY OR TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

SNOW LEVELS WILL FALL TO 4000 FEET BY TUESDAY AFTERNOON...WITH A
FEW INCHES OF SNOW ACCUMULATION POSSIBLE BY TUESDAY EVENING. STAY
TUNED TO LATER FORECASTS AND POSSIBLE STATEMENTS OR ADVISORIES.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.