Hail in Oregon, June 29, 2010

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
223 PM PDT TUE JUN 29 2010

.SHORT TERM...TONIGHT THROUGH FRIDAY MORNING...AN UPPER LEVEL TROUGH
CONTINUES TO MOVE TOWARDS THE PACIFIC NORTHWEST COAST THIS AFTERNOON
AND A MOIST SOUTHWEST FLOW CONTINUES OVER THE AREA. VISIBLE
SATELLITE SHOWS CUMULUS FIELDS DEVELOPING OVER THE EASTERN MOUNTAINS
AND MODELS DEPICT AN UNSTABLE ATMOSPHERE WITH WEAK CAPPING OVER THAT
AREA...ESPECIALLY UNION AND WALLOWA COUNTIES. A REPEAT OF LAST NIGHT
IS EXPECTED WITH PERHAPS EVEN STRONGER STORMS POSSIBLE. THE GREATEST
THREAT WOULD APPEAR TO BE FROM DAMAGING DOWNBURST WINDS IN EXCESS OF
60 MPH. HAIL GREATER THAN ONE INCH IN DIAMETER IS ALSO POSSIBLE WITH
THE STRONGER STORMS. BRIEF HEAVY DOWNPOURS OF UP TO A QUARTER INCH
OF RAIN WILL BE POSSIBLE AS WELL. IN COORDINATION WITH THE STORM
PREDICTION CENTER...A SEVERE THUNDERSTORM WATCH 429 HAS BEEN ISSUED
FOR UNION AND WALLOWA COUNTY THROUGH 10 PM PDT TONIGHT. SEE PRODUCT
PDXSWOMCD FOR FURTHER DETAILS. A FEW STORMS COULD ALSO REACH SEVERE
LEVELS IN EXTREME EASTERN GRANT COUNTY ALONG THE HIGHER TERRAIN OF
THE MOUNTAINS BUT FURTHER WEST IN THE POPULATION CENTERS LIKE JOHN
DAY...SEVERE STORMS ARE NOT EXPECTED.

ELSEWHERE...WINDY CONDITIONS WILL CONTINUE IN THE COLUMBIA GORGE AND
KITTITAS VALLEY THROUGH THIS EVENING WITH BREEZY CONDITIONS IN THE
COLUMBIA BASIN AND CENTRAL OREGON. WITH A COOLER AIR MASS MOVING IN
AND MOSTLY CLEAR TO PARTLY CLOUDY SKIES...TEMPERATURES WILL TUMBLE
ABOUT 5 TO 10 DEGREES TONIGHT. TOMORROW WILL SEE THE TROUGH MOVE
OVERHEAD AND THE ATMOSPHERE WILL BE MORE STABLE AS THE FLOW TURNS A
LITTLE MORE WESTERLY. A FEW THUNDERSTORMS WILL DEVELOP IN THE
AFTERNOON AND EVENING IN WALLOWA COUNTY. THEY ARE NOT EXPECTED TO
REACH SEVERE LEVELS. THE REST OF THE AREA WILL BE DRY ASIDE FROM A
FEW MORNING SHOWERS ALONG THE WASHINGTON CASCADE CREST. TEMPERATURES
WILL DROP TO THE 70S WITH LOWER 60S TO LOWER 70S IN THE MOUNTAINS.
WEDNESDAY NIGHT A LOW WITH A FRONT WILL DROP SOUTH OUT OF THE GULF
OF ALASKA INTO THE TROUGH AND APPROACH THE PACIFIC NORTHWEST COAST
WITH AN INCREASE IN CLOUDS LATE AND A FEW SHOWERS ALONG THE CASCADE
CREST. THE FRONT WILL MOVE INTO THE AREA THURSDAY AFTERNOON AND GIVE
MOST OF THE AREA A CHANCE OF SHOWERS THROUGH THE NIGHT AND INTO
FRIDAY MORNING. THE MOUNTAINS LOOK TO HAVE THE BULK OF THE RAIN AND
COULD SEE UP TO A QUARTER INCH OF RAIN WHILE THE LOWER ELEVATIONS
SEE LESS THAN A TENTH OF AN INCH. TEMPERATURES THURSDAY AND FRIDAY
WILL REMAIN COOL WITH HIGHS IN THE 70S AND 60S IN THE MOUNTAINS.
LOWS WILL BE IN THE MID 40S TO MID 50S WITH MID 30S TO MID 40S IN
THE MOUNTAINS. BREEZY WINDS ARE EXPECTED WITH THE SYSTEM THURSDAY
AFTERNOON AND EVENING. PERRY

.LONG TERM...FRIDAY AFTERNOON THROUGH TUESDAY...A BROAD TROUGH WILL
BE OVER EASTERN WASHINGTON AND OREGON FRIDAY THROUGH SUNDAY. AN
UPPER LEVEL LOW WILL SWING ACROSS NORTHERN WASHINGTON FRIDAY...BUT
ENOUGH LIFT AND INSTABILITY ASSOCIATED WITH SOUTHERN END OF THE
TROUGH WILL BE OVER THE AREA TO TRIGGER A FEW SHOWERS OVER
SOUTHEASTERN WASHINGTON AND NORTHEASTERN OREGON. THE HIGHEST POPS
WILL BE IN THE NORTHERN BLUES. BY FRIDAY EVENING THE EASTERN PART OF
THE AREA WILL HAVE DOWNSLOPING NORTHWEST FLOW ON THE BACKSIDE OF THE
TROUGH...SO YAKIMA AND KITTITAS COUNTIES WILL DRY OUT EARLY. A WEAK
WAVE WILL MOVE THROUGH THE NORTHWEST FLOW SATURDAY AFTERNOON AND
EVENING THAT WILL TRIGGER A FEW UPSLOPE SHOWERS IN THE
BLUE...ELKHORN OR WALLOWA MOUNTAINS. ANOTHER LOW WILL MOVE THROUGH
SOUTHERN CANADA INDEPENDENCE DAY. MOST OF THE LIFT WILL REMAIN IN
NORTHERN WASHINGTON BUT THE SOUTHERN END OF THE ASSOCIATED TROUGH
MAY TRIGGER A FEW MOUNTAIN SHOWERS ALONG THE CASCADES AND NORTHEAST
OREGON MOUNTAINS. HIGH PRESSURE WILL BUILD INTO THE PACIFIC
NORTHWEST SUNDAY NIGHT THROUGH TUESDAY WITH DRY AND WARMER WEATHER.
COONFIELD

&&

.AVIATION...00Z TAFS...VFR CONDITIONS WILL CONTINUE FOR THE NEXT 24
HOURS. COOLER AIR WILL CONTINUE TO SPREAD THROUGH THE CASCADE GAPS
AND THE EASTERN COLUMBIA RIVER GORGE THIS EVENING. AT KDLS...WINDS
OF 15-25 KTS WILL PERSIST THROUGH THIS EVENING...THEN DECREASE
OVERNIGHT. WINDS AT KPDT AND KALW WILL BE A LITTLE LOWER AT 10-20
KTS. FEW-SCT CUMULUS CLOUDS ARE EXPECTED THROUGH 08Z. A FEW
THUNDERSTORMS WILL DEVELOP OVER GRANT COUNTY OR THE BLUES AFTER
21Z. THERE IS A SLIGHT CHANCE ONE OF THESE STORMS MAY AFFECT KPDT OR
KALW 21Z-04Z. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  49  76  49  73 /  10  10  10  20
ALW  54  78  53  76 /  10  10  10  20
PSC  51  80  53  77 /   0   0   0  20
YKM  45  76  49  73 /   0   0  10  20
HRI  50  79  51  76 /   0   0  10  20
ELN  49  75  49  70 /   0  10  10  20
RDM  36  75  40  71 /   0  10  10  10
LGD  47  74  46  73 /  30  10  10  30
GCD  47  75  47  75 /  20  10  10  20
DLS  49  77  51  70 /   0  10  10  20

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.
&&

THREAT INDEX
WEDNESDAY : YELLOW
THURSDAY : GREEN
FRIDAY : GREEN

GREEN: NONE OR LIMITED NEED FOR WATCHES, WARNINGS, OR ADVISORIES.
YELLOW: A FEW WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.
RED: NUMEROUS WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

83/76/76

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
145 PM PDT TUE JUN 29 2010

UPDATED FOR SEVERE THUNDERSTORM WATCH UNION AND WALLOWA COUNTIES

ORZ041>044-049-050-501>506-WAZ024-026>030-501-502-301200-
EASTERN COLUMBIA RIVER GORGE OF OREGON-NORTH CENTRAL OREGON-
CENTRAL OREGON-LOWER COLUMBIA BASIN OF OREGON-GRANDE RONDE VALLEY-
WALLOWA COUNTY-FOOTHILLS OF THE BLUE MOUNTAINS OF OREGON-
NORTHERN BLUE MOUNTAINS OF OREGON-
SOUTHERN BLUE MOUNTAINS OF OREGON-
NORTHERN WHEELER AND SOUTHERN GILLIAM COUNTIES-JOHN DAY BASIN-
OCHOCO-JOHN DAY HIGHLANDS-
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-KITTITAS VALLEY-
YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-
NORTHWEST BLUE MOUNTAINS OF WASHINGTON-
EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON-
EAST SLOPES OF THE SOUTHERN CASCADES OF WASHINGTON-
145 PM PDT TUE JUN 29 2010

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

.DAY ONE...THIS AFTERNOON THROUGH TONIGHT

RISK OF SEVERE THUNDERSTORMS
     UNION COUNTY, WALLOWA COUNTY

THE NOAA/NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM
WATCH THIS AFTERNOON AND EVENING FOR UNION AND WALLOWA COUNTIES.
SOME THUNDERSTORMS MAY PRODUCE LARGE HAIL AND DAMAGING WIND GUSTS.

THUNDERSTORMS
     NORTHWEST BLUE MOUNTAINS OF WASHINGTON, NORTHERN BLUE
     MOUNTAINS OF OREGON, SOUTHERN BLUE MOUNTAINS OF OREGON, JOHN
     DAY BASIN, OCHOCO-JOHN DAY HIGHLANDS

SCATTERED AFTERNOON AND EVENING THUNDERSTORMS CAN BE EXPECTED TODAY
FROM THE BLUE MOUNTAINS SOUTH AND EAST AS A SOUTHWEST FLOW ALOFT
PERSISTS OVER MOIST AND UNSTABLE AIR. COOLER AND MORE STABLE MARINE
AIR WILL BE FILTERING INTO WESTERN PORTIONS OF THE FORECAST AREA
TODAY EAST OF THE CASCADES. THIS WILL KEEP ANY THUNDERSTORM DEVELOPMENT
SUPPRESSED WEST AND NORTH OF THE BLUE MOUNTAINS AND IN CENTRAL OREGON.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THUNDERSTORMS WEDNESDAY
     WALLOWA COUNTY

SOME REMNANT UNSTABLE AIR MAY ALLOW ISOLATED AFTERNOON THUNDERSTORMS
AGAIN ON WEDNESDAY IN WALLOWA COUNTY. ELSEWHERE COOLER AND MORE
STABLE MARINE AIR WILL CONTINUE TO MOVE INTO THE FORECAST AREA FROM
THE WEST. THE COOLING TREND WILL CONTINUE THROUGH THURSDAY. SLOW
WARMING WILL THEN BEGIN AGAIN ON FRIDAY THROUGH THE WEEKEND...
HOWEVER TEMPERATURES WILL REMAIN NEAR TO SLIGHTLY BELOW NORMAL.
THERE WILL ALSO BE A CONTINUED THREAT OF SHOWERS EACH DAY MAINLY
OVER THE MOUNTAINS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

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

GRAPHICAL FORECASTS OF WEATHER HAZARDS OUT TO SEVEN DAYS
ARE DISPLAYED ON THE WORLD WIDE WEB AT:

WWW.WRH.NOAA.GOV/PDT/CURRENTHAZARDS/HWO.HTML

ALL LETTERS IN THE ABOVE URL ARE LOWER CASE.