‘General troughiness’

I’ll confess that sometimes I have trouble translating the NWS “discussion” of local weather. My interpretation of this morning’s discussion is that there’s a big ole layer of fog reaching as high as 2,000 feet. In the afternoon, wind may blow this fog away, giving us sunshine. But it will be gusty and cool. Right? – Jack

Raw from the NWS:

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
425 AM PDT THU JUN 23 2011

.SYNOPSIS…DAYTIME TEMPERATURES WILL BE COOLER FOR THE REMAINDER
OF THE WEEK AS AN UPPER LEVEL TROUGH LINGERS ALONG THE WEST COAST.
HIGH PRESSURE BUILDING INTO THE EASTERN PACIFIC WILL CAUSE
INCREASING NORTH WINDS…LEADING TO MORE AFTERNOON SUNSHINE ALONG
THE COAST DURING THE AFTERNOONS THROUGH THE WEEKEND.

&&

.DISCUSSION…PER LATEST SATELLITE PIC…TROUGH AXIS IS SET TO
SWING THROUGH NW CA THIS MORNING. THE MARINE LAYER IS AT ITS
MAXIMUM DEPTH EARLY THIS MORNING (AROUND 2000 FT)…AND SHOULD MIX
OUT LATER THIS MORNING AS NORTH WINDS INCREASE BEHIND THE TROUGH.
TEMPS WILL BE ANOTHER 5-10 DEGREES BELOW YESTERDAYS READINGS
ACROSS THE INTERIOR AS COOLER AIR FILTERS IN BEHIND THE TROUGH.
GENERAL TROUGHINESS WILL HANG ON ALONG THE WEST COAST AS SFC HIGH
PRESSURE BUILDS OVER THE E PAC. THIS SCENARIO WILL LEAD TO A TIGHT
PRESSURE GRADIENT ALONG THE IMMEDIATE COAST WITH GUSTY AFTERNOON
WINDS LEADING TO SUNSHINE IN THE AFTERNOONS THROUGH FRI AS THE MARINE
LAYER MIXES OUT. A MORE SUBSTANTIAL SHORTWAVE MOVES THROUGH ON
SAT…CAUSING THE PRESSURE GRADIENT TO SLACKEN…LEADING TO A
RETURN TO MORE STRATUS. WEAK RIDGING BUILDS IN FOR SUN AND MON
AHEAD OF A BROADER TROUGH DROPPING OUT OF THE GULF OF ALASKA.
MODEL RUN-TO-RUN CONSISTENCY IN REGARDS TO THIS TROUGH HAS BEEN
POOR AND THUS CONFIDENCE IS LOW…BUT OVERALL HUNG ONTO SCHC POPS
FOR MTN -SHRA/TSTMS TUE AND WED DUE TO INCREASED ONSHORE FLOW AND
WEAK INSTABILITY. JCA

&&

.AVIATION…MARINE CLOUDS ENTRENCHED ACROSS THE LITTORAL ZONE ONCE
AGAIN THIS MORNING BUT A LITTLE MORE MIXING DUE TO A PASSING UPPER
TROUGH HAS ALLOWED CIGS TO RISE SLIGHTLY…ESPECIALLY AT KCEC. THE
TROUGH WILL PASS BY THE REGION TODAY WHICH SHOULD ALLOW FOR
CONTINUED MIXING ALONG THE COAST. THUS HIGHER CIGS AND POSSIBLY EVEN
CLEARING WILL OCCUR LATER THIS AFTERNOON. INLAND VFR CONDITIONS WILL
BE MAINTAINED.

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