735 
FXUS66 KEKA 031554
AFDEKA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
830 AM PDT TUE AUG 3 1999

RECENT PIREP SHOWS TOPS OVER FORTUNA AT 1000 FT. AND MORNING
SATELLITE IMAGES SHOW STRATUS EXTENDING QUITE FAR UP THE EEL RIVER
VALLEY. WITH EXTENT OF STRATUS OFFSHORE AND AFTERNOON NORTHWEST WIND
EXPECTED...WILL HAVE TO MAKE MINOR WORDING CHANGES TO COAST ZONE TO
ALLOW FOR A FEW CLOUDS LINGERING AROUND THR COAST INTO THE AFTERNOON.
MORE IMPORTANTLY...ONLY THE NGM HINTS AT POSSIBILITY OF THUNDERSTORMS
OVER TRINITY COUNTY...WITH LI VALUES BELOW ZERO...WHILE THE ETA AND
AVN BOTH KEEP THINGS STABLE WITH THE EQUIVALENT POTENTIAL TEMPERATURE
RIDGE MAINLY IN OREGON. DEWPOINTS AT THE TRINITY RAWS SITES ARE UP A
FEW DEGREES FROM YESTERDAY...56 AT TRINITY CAMP AND 55 AT BOTH
WEAVERVILLE AND ARBUCKLE BASIN AT 15Z THIS AM. NGM FEATURES SLIGHTLY
COLDER AIR AT 500 MB WITH STRONGER VORT MAX IN WEAK FLOW OVER N CA
TODAY THAN THE OTHER MODELS. MODIFIED 12Z MFR SOUNDING GIVES 450
J/KG OF CAPE UP THERE...WHICH IS CONSISTENT WITH ETA AND AVN. SINCE
ETA SHOWED THAT MUCH OVER TRINITY YESTERDAY...WILL KEEP THUNDERSTORMS
OUT OF FORECAST BUT MENTION CLOUDS TO ACCOUNT FOR TCU DEVELOPMENT
THIS AFTERNOON.

TJADEN

ALL POPS ZERO.

.EKA...NONE.