678
FXUS66 KEKA 092300
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
400 PM PDT FRI MAY 9 2008
SYNOPSIS
A SERIES OF DISTURBANCES ALOFT WILL MOVE OVER NORTHWEST
CALIFORNIA THROUGH THE WEEKEND. THESE DISTURBANCES ARE EXPECTED TO
BE RELATIVELY WEAK AND DRY BRINGING JUST A SLIGHT CHANCE OF SHOWERS
OR DRIZZLE TO FAR NORTHERN CALIFORNIA. IN ADDITION...EXPECT A PUSH
OF MARINE AIR AND LOW CLOUDS INTO THE COASTAL RIVER VALLEYS.
DISCUSSION
VISIBLE SATELLITE IMAGERY FROM TODAY SHOWED SUNNY
SKIES ACROSS MOST OF NW CALIFORNIA WITH COASTAL STRATUS DISSIPATING
BY 19Z. LITTLE CHANGE WAS MADE TO THE FORECAST AS MODEL SOLUTIONS
ARE CONSISTENT WITH THE PROGRESSION OF WEAK WAVES MOVING ACROSS THE
REGION THIS WEEKEND. TONIGHT...A SHORTWAVE RIDGE WILL MOVE ACROSS
THE REGION BRINGING A RETURN OF STRATUS AND PATCHY FOG TO THE
REDWOOD COAST AND NORTH COAST RIVER VALLEYS. CLOUDS WILL INCREASE
ACROSS NORTHERN SECTIONS OF THE CWA TOMORROW AS THE WEAK TROUGH
APPROACHES FROM THE NW. THE MAIN ENERGY ASSOCIATED WITH THIS TROUGH
WILL REMAIN WELL NORTH OF THE AREA...MAINLY AFFECTING WASHINGTON AND
BRITISH COLUMBIA. THERE IS LITTLE MOISTURE TO PLAY WITH SO HAVE
MAINTAINED ONLY A SLIGHT CHANCE FOR RAIN TOMORROW NIGHT MAINLY IN
DEL NORTE COUNTY AND ALONG THE REDWOOD COAST. ANY RAIN THAT DOES
FALL WILL BE LIGHT WITH ONLY A COUPLE HUNDREDTHS OF AN INCH AT MAX.
FOLLOWING THE TROUGH PASSAGE...WILL SEE THE RIDGE BUILD BACK ACROSS
THE REGION BRINGING TYPICAL SPRINGTIME CONDITIONS FOR THE EARLY PART
OF THE WEEK. TOWARD THE MIDDLE OF THE WEEK (TUE) THE PATTERN WILL
CHANGE ABRUPTLY AS A RIGE OF HIGH PRESSURE BUILDS IN EARNEST OVER THE
EAST PACIFIC. SENSIBLE CHANGES INCLUDE MUCH WARMER TEMPERATURES OVER
THE INTERIOR GOING UP TO THE 80S ON TUESDAY AND INTO THE 90S BY
WEDNESDAY. COASTAL TEMPERATURES SHOULD REMAIN LOW AND THERE STILL EXISTS
SOME UNCERTAINTITY ON WHETHER STRATUS WILL REMAIN ALONG THE NORTH COAST
KEEPING AFTERNOON TEMPS AT BAY OR WHETHER SOME OFFSHORE FLOW WILL BE
STRONG ENOUGH TO REALLY ALLOW THE AFTERNOON TEMPS TO REACH INTO THE
MID TO UPPER 60S (OR HIGHER?) AT THIS TIME IT LOOKS LIKE LOW TO MID
60S IS A GOOD BET...AS EAST AND NORTHEAST WINDS DO NOT LOOK ESPECIALLY
STRONG. NONETHELESS SHOULD EXPERIENCE A FEW NICE DAYS AT THE COAST BEFORE
STRATUS BEGINS TO DEVELOP AND WEST WINDS BRING IT BACK IN FULLY (A BETTER
BET TOWARD THE END OF THE NEXT WEEK). RM/JT
AVIATION
VFR CONDITIONS HAVE TAKEN HOLD OF THE ENTIRE AREA. THE
STRONG NORTHWEST WINDS FROM THE PAST FEW DAYS WERE MUCH WEAKER TODAY
ESPECIALLY ALONG THE COASTAL SITES. THESE WINDS WILL RELAX FURTHER
TONIGHT THROUGH SATURDAY WHICH WILL ALLOW THE MARINE LAYER TO WORK
ITS WAY INTO KCEC AND KACV AFTER SUNSET. BOTH SITES WILL HAVE MVFR
WITH CEILINGS NEAR 1200 FT. THOUGH THE MARINE LAYER WILL BURN OFF
TOMORROW AFTER SUNRISE IT WILL WORK ITS WAY BACK IN LATER IN THE DAY
AS A WEAK FRONT MOVES INTO THE REGION. NO RAIN IS EXPECTED. =MS
MARINE....MARINE
NORTHERLY WINDS OVER THE WATERS WILL CONTINUE TO
EASE TONIGHT AS A WEAK COLD FRONT APPROACHES FROM THE WEST. THE
FRONT WILL MOVE ACROSS THE WATERS SAT. HIGH PRESSURE WILL BUILD OVER
THE NE PAC SAT NIGHT. NORTHERLY WINDS WILL INCREASE OVER THE WATERS
SUN AND MON...AS HIGH PRESSURE OVER THE OCEAN INTERACTS WITH LOWER
PRESSURE OVER LAND. THE WINDS EARLY IN THE WEEK WILL BE STRONGEST
OVER THE SOUTHERN WATERS AND AROUND CAPE MENDOCINO WHERE SUSTAINED
GALE FORCE WINDS ARE EXPECTED. THE SEAS WILL BECOME INCREASINGLY
HAZARDOUS SUN AND MON AS STEEP WINDWAVES INTERMINGLE WITH A NW SWELL
8 TO 10 FT AT 10 SECONDS. TH
EKA WATCHES/WARNINGS/ADVISORIES
SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS UNTIL 6 PM PDT FOR PZZ450.
SMALL CRAFT ADVISORY FOR WINDS AND HAZARDOUS SEAS UNTIL 6 PM FOR
PZZ470.
SMALL CRAFT ADVISORY FOR WINDS AND HAZARDOUS SEAS UNTIL MIDNIGHT PDT
FOR PZZ455-475.
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