Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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000
FXUS66 KSEW 272141
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
245 PM PDT SAT SEP 27 2014

.SYNOPSIS...A WEAK UPPER RIDGE WILL KEEP THE WEATHER DRY THROUGH
SUNDAY. A FRONT WILL BRING SOME RAIN TO THE AREA MONDAY. SCATTERED
SHOWERS WILL LINGER INTO THE MIDDLE OF THE WEEK. A STRONGER UPPER
RIDGE WILL BUILD BY THE END OF NEXT WEEK.

&&

.SHORT TERM...MOSTLY CLEAR SKIES TONIGHT WILL BE FOLLOWED BY AREAS
OF LATE NIGHT AND MORNING LOW CLOUDS OR FOG. OTHERWISE...SUNDAY WILL
BE SUNNY AGAIN WITH TEMPS A COUPLE DEGREES WARMER. PRESSURE
GRADIENTS WILL TURN ONSHORE AND A COLD FRONT WILL MOVE THROUGH THE
AREA MONDAY AFTERNOON AND EVENING...WITH AN UPPER TROUGH TROUGH WRN
WA MONDAY NIGHT AND ONSHORE FLOW AND SCATTERED SHOWERS POSSIBLE TUE.

.LONG TERM...CLOUDS AND A CHANCE OF SHOWERS MAY LINGER WED AND THU
BUT UPPER HEIGHTS ARE LIKELY TO RISE TOWARD THE END OF NEXT WEEK.
THE 12Z GFS HAS 500MB HEIGHTS RISING FROM AROUND 5700M LATE WED TO
AROUND 5850M OVER THE WEEKEND SO FOR NOW THE MODELS ARE TRENDING
TOWARD WARM AND SUNNY WEATHER TOWARD THE END OF NEXT WEEK.

&&

.AVIATION...AN UPPER LEVEL LOW IS SPINNING OVER THE GREAT BASIN THIS
AFTERNOON...WHILE A WEAK UPPER LEVEL RIDGE IS NUDGING EAST INTO THE
PAC NW. THE FLOW ALOFT IS WESTERLY. THE AIR MASS IS STABLE WITH
FEW-SCT CLOUDS NEAR 2000-3000 FT. LOW CLOUDS AND FOG WILL RETURN
OVERNIGHT...LIFR TO IFR CONDITIONS ARE LIKELY IN THE INTERIOR
THROUGH SUN MORNING. 33

KSEA...LOW CLOUDS AND FOG WILL RETURN OVERNIGHT WITH LIFR TO IFR
CONDITIONS BY 09-12Z. SURFACE WINDS WILL REMAIN LIGHT NORTHERLY. LOW
CLOUDS WILL LIFT/SCATTER BY 18-20Z.

&&

.MARINE...WEAK SURFACE HIGH PRES OVER WESTERN WA WILL GIVE LIGHT
WINDS ACROSS THE REGION TONIGHT THROUGH SUN. A WEAK COLD FRONT WILL
CROSS THE AREA ON MONDAY. ONSHORE FLOW WILL INCREASE BEHIND THE
FRONT MON NIGHT WITH SMALL CRAFT ADVISORY WINDS FORECAST THROUGH THE
CENTRAL AND EAST STRAIT OF JUAN DE FUCA. ONSHORE FLOW WILL PREVAIL
THROUGH THE MIDDLE OF NEXT WEEK.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...NONE.

&&

$$

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