Funnel Cloud in Oregon, May 17, 2003

NORTHWEST OREGON AND SOUTHWEST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
200 PM PDT SAT MAY 17 2003

.SYNOPSIS...A COLD UPPER LEVEL TROUGH WILL MOVE E OF THE PACIFIC NW
SUN AND MON BRINGING IN WARMER DRIER AIR.  A WARM FRONT WILL BRUSH
THE NORTHWEST PART OF THE FORECAST AREA TUE NIGHT AND WED...THEN AN
UPPER LEVEL RIDGE WILL KEEP THE WEATHER QUIET THROUGH THE REMAINER OF
THE WEEK.

.DISCUSSION...
.SHORT TERM...UNSTABLE AIR MASS WILL REMAIN SO THROUGH THE EVENING
WITH WIDESPREAD SHOWERS...BUT THEN AS UPPER TROUGH BEGINS TO SHIFT E
AND SURFACE TEMPS COOL WILL SEE SHOWERS DROP OFF.  SUNDAY MAIN AREA
OF SHOWERS WILL HAVE SHIFTED E...AND WILL LEAVE IN ONLY LOW POPS ON
THE BACK SIDE OF THE UPPER TROUGH...OVER THE NE PART OF THE FORECAST
AREA.  A COOL NIGHT IN STORE NEXT COUPLE OF NIGHTS WHERE DAYTIME
CONVECTIVE CLOUDS DO NOT SPREAD INTO A SC LAYER...AND AREAS OF FROST
ARE NOT OUT OF THE QUESTION.  WARM FRONT LIFTING NE TUE NIGHT INTO
WED WILL BRING A CHANCE OF LIGHT RAIN TO THE N COASTAL AREAS WHERE
ONSHORE FLOW IS BEST.

.LONG TERM...MOST MODELS TENDING TOWARDS A FLAT UPPER RIDGE OVER THE
PACIFIC NW THROUGH FRI WITH LOW LEVEL FLOW MAINLY OFFSHORE...SO WILL
KEEP FORECAST DRY AND MILD.  TOWARDS THE WEEKEND MODELS BECOME MORE
CHAOTIC AS HANDLING THE OFFSHORE TROUGH.  WILL LEAN TOWARDS GFS
SOLUTION AND BRING IN A CHANCE OF PRECIPITATION FOR FRI NIGHT AND
SAT.

AST 621013  PDX 721001 SLE 621001 EUG 610001

.PQR...SMALL CRAFT ADVISORY FOR ROUGH COLUMBIA RIVER BAR.

ORZ001>013-WAZ019>023-039-040-181230-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PORTLAND OREGON
530 AM PDT SAT MAY 17 2003

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

.DAY ONE... TODAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN... SUNDAY THROUGH FRIDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO SKYWARN PROCEDURE

ORZ003>008-010-012-WAZ020-022-039-040-181300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PORTLAND OR
242 PM PDT SAT MAY 17 2003

...AREAS OF FROST POSSIBLE....

THE COLD AIR MASS THAT HAS MOVED OVER OUR AREA WILL PRODUCE VERY
COLD TEMPERATURES EARLY SUNDAY MORNING AND AGAIN EARLY MONDAY
MORNING.  SOME OF THE INLAND VALLEYS TONIGHT WILL GET ENOUGH
CLEARING TO SEE TEMPERATURES APPROACH FREEZING IN SOME RURAL AREAS.
ALL AREAS WILL SEE CLEARING SUNDAY NIGHT WITH WIDESPREAD AREAS OF
TEMPERATURES APPROACHING FREEZING IN RURAL INLAND AREAS.

WIDESPREAD AREAS OF FROST ARE POSSIBLE ESPECIALLY EARLY MONDAY
MORNING.  SENSITIVE VEGETATION ESPECIALLY VEGETATION NEAR THE GROUND
WILL BE SUBJECT TO FROST AND POSSIBLE FREEZING TEMPERATURES.
PERSONS WILL NEED TO TAKE ACTION TO PROTECT SENSITIVE PLANTS LATE
TONIGHT AND AGAIN LATE SUNDAY NIGHT.