Hazardous Weather Outlook
Issued by NWS Pendleton, OR

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FLUS46 KPDT 231531
HWOPDT

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
831 AM PDT THU MAY 23 2013

ORZ041-042-050-502-503-505>509-WAZ024-026-027-029-030-520-521-
241545-
EASTERN COLUMBIA RIVER GORGE OF OREGON-NORTH CENTRAL OREGON-
WALLOWA COUNTY-NORTHERN BLUE MOUNTAINS OF OREGON-
SOUTHERN BLUE MOUNTAINS OF OREGON-JOHN DAY BASIN-OCHOCO-
JOHN DAY HIGHLANDS-
FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON-
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-
EAST SLOPES OF THE OREGON CASCADES-
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-KITTITAS VALLEY-
YAKIMA VALLEY-FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-
NORTHWEST BLUE MOUNTAINS OF WASHINGTON-
EAST SLOPES OF THE WASHINGTON CASCADES-SIMCOE HIGHLANDS-
831 AM PDT THU MAY 23 2013

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

.DAY ONE...TODAY AND TONIGHT

A LARGE UPPER LOW PRESSURE SYSTEM WITH COLD TEMPERATURES ALOFT
WILL CREATE AN UNSTABLE ATMOSPHERE THIS AFTERNOON AND EVENING OVER
THE FORECAST AREA. THIS WILL ALLOW SHOWERS AND ISOLATED THUNDERSTORMS
TO DEVELOP DURING THE AFTERNOON AND CONTINUE UNTIL SUNSET. SOME
OF THE STRONGER THUNDERSTORMS MAY PRODUCE SMALL HAIL...GUSTY
WINDS AND BRIEF HEAVY RAIN.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THE ATMOSPHERE WILL REMAIN UNSETTLED AS THE UPPER LOW PRESSURE
SYSTEM LINGERS OVER THE AREA THROUGH FRIDAY WITH MORE POSSIBLE
AFTERNOON AND EVENING THUNDERSTORMS. ANOTHER LOW PRESSURE SYSTEM
WILL MOVE INTO THE REGION ON SUNDAY AND AGAIN ON WEDNESDAY WHICH
MAY PRODUCE ISOLATED AFTERNOON AND EVENING THUNDERSTORMS AGAIN.

$$
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