Hazardous Weather Outlook
Issued by NWS Pendleton, OR

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 
000
FLUS46 KPDT 211327
HWOPDT

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
627 AM PDT TUE MAY 21 2013

ORZ049-050-502-503-505-506-WAZ030-221330-
GRANDE RONDE VALLEY-WALLOWA COUNTY-
NORTHERN BLUE MOUNTAINS OF OREGON-
SOUTHERN BLUE MOUNTAINS OF OREGON-JOHN DAY BASIN-OCHOCO-
JOHN DAY HIGHLANDS-NORTHWEST BLUE MOUNTAINS OF WASHINGTON-
627 AM PDT TUE MAY 21 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
OREGON...NORTHEAST OREGON AND SOUTHEAST WASHINGTON.

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
OREGON...NORTH CENTRAL OREGON...NORTHEAST OREGON AND SOUTHEAST
WASHINGTON.

.DAY ONE...TODAY AND TONIGHT

A LARGE UPPER LEVEL LOW PRESSURE SYSTEM WILL DEVELOP RAPIDLY AND
APPROACH THE OREGON COAST THIS AFTERNOON. THE LOW WILL PUSH A COLD
FRONT THROUGH THE EASTERN SECTIONS OF OREGON AND SOUTHEAST
WASHINGTON TODAY. INSTABILITY EAST OF THE COLD FRONT WILL TRIGGER
ISOLATED THUNDERSTORMS THIS AFTERNOON AND THIS EVENING. ANY
THUNDERSTORMS THAT DO OCCUR ARE NOT EXPECTED TO BE STRONG OR
SEVERE.

SNOW LEVELS WILL LOWER TO PASS LEVELS, AROUND 2800-3500 FEET, BY
OVERNIGHT INTO WEDNESDAY MORNING IN CENTRAL AND NORTHEAST OREGON
AND IN THE BLUE MOUNTAINS IN SOUTHEAST WASHINGTON. SNOW
ACCUMULATIONS OF 2-3 INCHES ARE EXPECTED BY DAYBREAK WEDNESDAY IN
THE BLUE MOUNTAINS, THE WALLOWA MOUNTAINS, THE ELKHORN MOUNTAINS,
ALONG SUMMIT RIDGE IN EASTERN WALLOWA COUNTY, AND IN THE OCHOCO-
JOHN DAY HIGHLANDS. AN OFF-SEASON SNOW ADVISORY MAY BE NEEDED IN
SOME OF THESE AREAS FOR LATE TONIGHT THROUGH WEDNESDAY MORNING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

THE AFOREMENTIONED UPPER LOW WILL PERSIST OVER THE PACIFIC
NORTHWEST THROUGH FRIDAY. AS SUCH THE LOW WILL KEEP LINGERING
UNSETTLED WEATHER ACROSS THE REGION WITH PERIODS OF RAIN SHOWERS
AT LOWER ELEVATIONS AND SNOW SHOWERS ABOVE 5000-5500 FEET THROUGH
FRIDAY IN THE MOUNTAINS OF NORTHEAST OREGON. THE LOW WILL BRING A
SLIGHT CHANCE OF THUNDERSTORMS IN THE OCHOCO-JOHN DAY HIGHLANDS
NORTHEASTWARD TO THE BLUE MOUNTAINS AND GRANT COUNTY EASTWARD INTO
IDAHO DURING IN THE AFTERNOON AND EVENING ON THURSDAY AND FRIDAY.

$$

POLAN
USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.