000 
FLUS46 KPDT 171155
HWOPDT

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OREGON
500 AM PDT THU JUN 17 2004

ORZ041>050-WAZ024>030-181200-
NORTH CENTRAL OREGON-CENTRAL OREGON-LOWER COLUMBIA BASIN (OR)-
FOOTHILLS OF THE BLUE MOUNTAINS (OR)-BLUE MOUNTAINS-JOHN DAY BASIN-
OCHOCO-JOHN DAY HIGHLANDS-GRANDE RONDE VALLEY-WALLOWA COUNTY-
EASTERN COLUMBIA RIVER GORGE (WA)-
EAST SLOPES OF THE SOUTHERN CASCADES-KITTITAS VALLEY-YAKIMA VALLEY-
LOWER COLUMBIA BASIN (WA)-FOOTHILLS OF THE BLUE MOUNTAINS (WA)-
NORTHWEST BLUE MOUNTAINS-
500 AM PDT THU JUN 17 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.

.DAY ONE...TODAY AND TONIGHT

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

A WEAK WAVE EMBEDDED IN A NORTHERLY FLOW ALOFT IS EXPECTED TO CLIP 
WALLOWA COUNTY THIS AFTERNOON AND EVENING.  THIS COMBINED WITH 
AFTERNOON HEATING WILL TRIGGER ISOLATED THUNDERSTORMS.  THESE STORMS 
ARE NOT EXPECTED TO REACH SEVERE CRITERIA DUE TO WEAK LOW LEVEL WIND 
SHEAR.  THE GREATEST THREAT FROM THESE STORMS WILL BE GUSTY 
WINDS...WITH GUSTS TO 40 MPH POSSIBLE.  ELSEWHERE...THE ATMOSPHERE 
IS EXPECTED TO REMAIN STABLE WITH MOSTLY SUNNY SKIES.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

THE ATMOSPHERE WILL BECOME UNSTABLE ONCE AGAIN FRIDAY AFTERNOON AND 
EVENING AS AN UPPER LOW LINGERS OVER THE PACIFIC NORTHWEST.  THERE 
WILL BE A SLIGHT CHANCE OF THUNDERSTORMS OVER THE BLUE MOUNTAINS... 
GRANDE RONDE VALLEY...AND WALLOWA COUNTY.  THESE STORMS ARE EXPECTED 
TO REMAIN BELOW SEVERE CRITERIA DUE TO WEAK LOW LEVEL WIND SHEAR.  
DRY WEATHER IS EXPECTED ACROSS THE REGION SATURDAY THROUGH WEDNESDAY 
WITH NEAR SEASONAL TEMPERATURES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

$$