Hazardous Weather Outlook
Issued by NWS Pendleton, OR

000
FLUS46 KPDT 231151
HWOPDT

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

ORZ041-042-050-502-503-505-506-509-WAZ024-026-027-030-520-521-
241200-
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-EAST SLOPES OF THE OREGON CASCADES-
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-KITTITAS VALLEY-
YAKIMA VALLEY-NORTHWEST BLUE MOUNTAINS OF WASHINGTON-
EAST SLOPES OF THE WASHINGTON CASCADES-SIMCOE HIGHLANDS-
451 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
AND STEEP TEMPERATURE LAPSE RATES WILL CREATE AN UNSTABLE
ATMOSPHERE THIS AFTERNOON AND EVENING. THIS WILL ALLOW SHOWERS
AND ISOLATED THUNDERSTORMS TO DEVELOP BY THIS AFTERNOON ACROSS
MUCH OF THE FORECAST AREA. SOME OF THE STRONGER THUNDERSTORMS MAY
PRODUCE SMALL HAIL...STRONG GUSTY WINDS AND 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 IN THESE SAME AREAS. ANOTHER
LOW PRESSURE SYSTEM WILL MOVE INTO THE REGION ON SUNDAY AND AGAIN
ON WEDNESDAY WHICH MAY PRODUCE ISOLATED AFTERNOON AND EVENING
THUNDERSTORMS AGAIN.

$$

ORZ049-508-241200-
GRANDE RONDE VALLEY-
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-
451 AM PDT THU MAY 23 2013

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

.DAY ONE...TODAY AND TONIGHT

AN UNSEASONABLY COLD AIR MASS WILL ALLOW TEMPERATURES TO FALL TO
NEAR OR BELOW FREEZING EARLY THIS MORNING ACROSS THE GRANDE RONDE
VALLEY AND IN PORTIONS OF THE FOOTHILLS OF THE SOUTHERN BLUE
MOUNTAINS IN OREGON. A FREEZE WARNING IS IN EFFECT UNTIL 9 AM
THIS MORNING IN THESE AREAS. PLEASE REFER TO NWS HAZARD PRODUCT
ID PDXNPWPDT FOR DETAILS. TEMPERATURES WILL RISE ABOVE FREEZING
BY 9 AM PDT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A GRADUAL WARMING TREND WILL ALLOW TEMPERATURES TO INCREASE TO
NORMAL READINGS AGAIN BY SATURDAY AND CONTINUE THROUGH AT LEAST
WEDNESDAY.

$$