FXUS66 KEKA 140359
AFDEKA

NORTHWEST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
900 PM PDT SUN JUL 13 2003

PLEASANT EVENING ACROSS NW CA WITH DRY AIRMASS BRINGING MAINLY CLEAR 
SKIES AND SEASONABLE TEMPERATURES. WATER VAPOR PICTURES SHOWING 
INFLUENCE OF YESTERDAYS WEAK SHORT WAVE WANING OVER NORCAL...WITH 4 
CORNERS RIDGE ONCE AGAIN EXPANDING NORTH-WESTWARD. UPPER LEVEL JET 
THAT BRIEFLY GRAZED THE ORCA BORDER YESTERDAY IS AGAIN SHUNTED WELL 
TO THE NORTH...AS DRY SEMI-ZONAL FLOW KEEPS WEATHER PATTERN STABLE 
ACROSS THE REGION. NEARLY STATIONARY UPPER LOW ALONG 140W AROUND 45W 
HAS BUDGED SLIGHTLY NORTHWARD...SLOWLY INCREASING HEIGHTS ONCE AGAIN 
FROM SOUTH TO NORTH INTO CENTRAL/NORTHERN CA THIS EVENING. MOISTURE 
CONTINUES TO WRAP AROUND THE HIGH...BUT IS THEN SHUNTED WELL 
EAST/SOUTHEAST OF OUR REGION. AFTERNOON HIGHS WERE AGAIN QUITE MILD 
NEAR THE COAST...WITH AMPLE SUNSHINE AND WEAK ONSHORE 
BREEZES...ESPECIALLY FROM EUREKA NORTHWARD. A MUCH STRONGER 
NORTHERLY GRADIENT EXISTS TO THE SOUTH...WHERE ACV/STS IS NEARLY 8MB 
AND ACV/SFO IS ABOUT 6MB. TEMPERATURES DROPPED A FEW DEGREES IN MOST 
INLAND LOCATIONS TODAY...WITH MORE MODERATE HEIGHTS BEHIND 
YESTERDAYS SHORT WAVE...AND SOME MORNING CLOUDS DUE TO THE DEEPER 
MARINE LAYER LAST NIGHT. 

RECENT VIS-FOG IMAGERY SHOWS STRATUS DEVELOPING JUST SOUTH OF 
HUMBOLDT BAY...WITH CLEAR SKIES OTHERWISE. AS WINDS STAY LIGHT NORTH 
OF CAPE MENDOCINO TONIGHT...EXPECT LOW CLOUD TO FILL BACK IN 
NORTHWARD TO NEAR THE ORCA BORDER...BUT MARINE LAYER DEPTH NEAR 1KFT 
WILL MEAN MUCH LESS INLAND PENETRATION TONIGHT. BRISK WIND SOUTH OF 
THE CAPE SHOULD KEEP MUCH OF MENDOCINO COUNTY CLEAR...EXCEPT THE 
IMMEDIATE COAST-LINE. TEMPERATURES WILL BE COOLER TONIGHT...WITH DEW 
POINTS DOWN ABOUT 4-7 DEGREES ACROSS THE BOARD AND LESS CLOUD COVER 
IN MOST AREAS. SLIGHT WARMING WILL COMMENCE MONDAY AS EASTERN 
PACIFIC HIGH PRESSURE STRENGTHENS...WITH 00Z ETA INDICATING A FEW 
DEGREES OF WARMING AT 850MB AND LESSER ONSHORE FLOW. SMALL CRAFT 
WINDS WILL SPREAD NORTHWARD AND INCREASE IN INTENSITY...AGAIN MAINLY 
SOUTH OF CAPE MENDOCINO KEEPING COASTAL CLOUDS TO A MINIMUM. 
AFTERNOON SUN AGAIN A GOOD BET EVEN AT THE REDWOOD COAST...WITH THE 
SHALLOW INVERSION MIXING OUT BY LATE MORNING/EARLY AFTERNOON. 

MODELS NOW DOWN-PLAYING THE MID-WEEK COOL DOWN AS THE AFFECT OF THE 
NEXT WEAK WAVE TO OUR NORTH IS DIMINISHED. SOUTHWEST FLOW ALOFT 
INCREASES BY LATE TUE...WITH SOME HINT AT INCREASED MID LEVEL 
MOISTURE AND INSTABILITY BY 00Z WED...MAINLY JUST TO THE NORTHEAST 
OF THE TRINITY ALPS. CURRENT GRIDS HAVE SOME AFTERNOON CLOUDS 
THERE...AND THIS SEEMS ABOUT THE EXTENT OF IT. THEREAFTER...MORE 
QUIET WEATHER FOR THE REMAINDER OF THE WEEK WITH SEASONABLY WARM 
TEMPERATURES INLAND AND MILD COAST-SIDE AS OFFSHORE SMALL CRAFT 
WINDS SPREAD NORTHWARD.

.EKA...SMALL CRAFT ADVISORY CAPE MENDOCINO TO PT ARENA 00-60NM

SOROKA

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