One product issued by NWS for:
Hazardous Weather Outlook
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. $$