Funnel Clouds in Oregon, June 13, 2013

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
847 AM PDT THU JUN 13 2013

.SYNOPSIS...COOL AND UNSETTLED WEATHER WILL PERSIST THROUGH FRIDAY
MORNING AS AN UPPER LEVEL LOW SLOWLY PUSHES ACROSS THE PAC NW. DRIER
AND WARMER WEATHER IS EXPECTED FRIDAY AFTERNOON AND SATURDAY.
ANOTHER UPPER LOW WILL BRING A RETURN OF UNSETTLED WEATHER SUNDAY
THAT WILL PERSIST THROUGH MUCH OF NEXT WEEK.

&&

.SHORT TERM...UPPER LOW WAS SEEN IN WATER VAPOR PICTURES NEAR THE
MOUTH OF THE COLUMBIA THIS MORNING. LOW IS EXPECTED TO CONTINUE TO
SWING SLOWLY SE TODAY ACROSS NW OREGON. SATELLITE AND RADAR SHOWED
SHOWERS WERE MAINLY AHEAD OF THE UPPER LOW...SO THE EXPECTATION IS
FOR SHOWERS TO BE MOST WIDESPREAD THIS MORNING. BY AFTERNOON AS THE
UPPER LOW PUSHES INTO THE CASCADES...SHOWERS WILL LIKELY BECOME MORE
DEPENDENT UPON DIURNAL HEATING AND OROGRAPHIC INFLUENCES.

REMAINDER OF SHORT TERM DISCUSSION UNCHANGED...
THE LOW WILL PUSH EAST OF THE CASCADES TONIGHT AND SHOWERS WILL
BEGIN TO DECREASE. SOME SHOWERS MAY LINGER OVER THE NORTHERN PORTION
FRIDAY MORNING. A SHORTWAVE UPPER RIDGE WILL BRING DRIER CONDITIONS
FRIDAY AFTERNOON AND SATURDAY. DAYTIME TEMPERATURES SHOULD REBOUND
INTO THE LOWER 70S FRIDAY AFTERNOON AND THE UPPER 70S ON SATURDAY.

A SECONDARY UPPER LOW WILL MOVE INTO THE NE PACIFIC FRIDAY NIGHT AND
SATURDAY MOVE OVER SHOWERS WILL EASE THURSDAY NIGHT

.LONG TERM...NO CHANGES. PREVIOUS DISCUSSION FOLLOWS.
MODELS IN OVERALL GOOD AGREEMENT THAT A SECONDARY UPPER LOW WILL
APPROACH THE PACIFIC NORTHWEST SATURDAY RESULTING IN SHOWERS OVER NW
OREGON AND SW WASHINGTON MOST OF NEXT WEEK. SOUTHERLY FLOW ALOFT
AHEAD OF THE LOW IS EXPECTED TO BRING UP A MOIST UNSTABLE AIR MASS
OVER THE CASCADES FOR A THREAT OF THUNDERSTORMS...MAINLY IN THE
AFTERNOON AND EVENING HOURS SUNDAY AND MONDAY. FLOW ALOFT TURNS MORE
SOUTHWESTERLY MONDAY...ALLOWING DEEPER MOISTURE TO SPREAD IN AS THE
LOW SLOWLY APPROACHES. WITH THE UPPER LOW COMES COOLER AIR AND LOWER
SNOW LEVELS...ALTHOUGH SNOW LEVELS ARE LIKELY TO REMAIN A LITTLE
ABOVE PASS LEVELS.

&&

.AVIATION...EXPECT A MIX OF MVFR AND IFR IN ENHANCED SHOWER ACTIVITY
THIS MORNING. CONDITIONS SHOULD IMPROVE TO VFR INLAND AFTER 18Z AS
SHOWER ACTIVITY DIMINISHES. MVFR CIGS MAY HOLD ON THROUGH MID
AFTERNOON AT THE COAST IN MODERATE ONSHORE FLOW. AFTER A PERIOD OF
VFR LATER THIS AFTERNOON...MVFR CIGS SHOULD PUSH BACK INTO THE COAST
LATER THIS EVENING.

KPDX AND APPROACHES...EXPECT PERIODS OF MVFR/IFR IN WIDESPREAD
SHOWERS THROUGH 18Z. CONDITIONS WILL IMPROVE TO VFR AFTER 18Z...WITH
CIGS 3500-4500 FT THIS AFTERNOON. VFR CONDITIONS SHOULD CONTINUE
THROUGH THIS EVENING...BUT MVFR MAY RETURN OVERNIGHT. PYLE

&&

.MARINE...BENIGN CONDITIONS CONTINUE TODAY AS A WEAK LOW PRESSURE
SYSTEM MAKES ITS WAY ONSHORE. WINDS REMAIN LIGHT NORTHWESTERLY OVER
THE WATERS TODAY. SHORT PERIOD 5 TO 6 FT NW SWELL WILL CONTINUE TO
AFFECT THE WATERS THROUGH TONIGHT...THEN SEAS SHOULD DROP BELOW 5 FT
BY TOMORROW MORNING. A THERMALLY INDUCED SURFACE TROUGH WILL BUILD
INTO N CALIFORNIA TOMORROW AFTERNOON. THIS MAY ALLOW WINDS IN THE
CENTRAL OREGON WATERS TO GUST NEAR 20 KT AT TIMES...BUT A SMALL
CRAFT ADVISORY IS NOT EXPECTED TO BE NEEDED AT THIS TIME. ANOTHER
UPPER LEVEL LOW WILL DEVELOP OFFSHORE THIS WEEKEND AND REMAIN OVER
THE WATERS THROUGH THE FIRST HALF OF NEXT WEEK. NO SIGNIFICANT
IMPACTS FROM THIS SYSTEM ARE EXPECTED OVER THE COASTAL WATERS. PYLE

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.
PZ...NONE.
&&

MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND

THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PORTLAND OR
550 AM PDT THU JUN 13 2013

ORZ001>014-WAZ019>023-039-040-141600-
NORTH OREGON COAST-CENTRAL OREGON COAST-
COAST RANGE OF NORTHWEST OREGON-
CENTRAL COAST RANGE OF WESTERN OREGON-LOWER COLUMBIA-
GREATER PORTLAND METRO AREA-CENTRAL WILLAMETTE VALLEY-
SOUTH WILLAMETTE VALLEY-WESTERN COLUMBIA RIVER GORGE-
NORTHERN OREGON CASCADE FOOTHILLS-NORTHERN OREGON CASCADES-
CASCADE FOOTHILLS IN LANE COUNTY-CASCADES IN LANE COUNTY-
UPPER HOOD RIVER VALLEY-SOUTH WASHINGTON CASCADES-WILLAPA HILLS-
SOUTH WASHINGTON COAST-I-5 CORRIDOR IN COWLITZ COUNTY-
GREATER VANCOUVER AREA-SOUTH WASHINGTON CASCADE FOOTHILLS-
550 AM PDT THU JUN 13 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
OREGON AND SOUTHWEST WASHINGTON.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT LIKELY BE NEEDED TODAY.