Hail in Oregon, May 21, 2006

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
510 PM PDT SUN MAY 21 2006

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH TUESDAY NIGHT...MOISTURE CONTINUES TO
STREAM NORTH FROM AN UPPER LOW NEAR 32N/128W THIS AFTERNOON. A
DEFORMATION BAND DEVELOPED TODAY OVER NORTHEASTERN OREGON AND
BROUGHT AREAS OF LIGHT RAIN DURING THE LATE MORNING AND EARLY
AFTERNOON. THIS BAND HAS MOVED INTO CENTRAL WASHINGTON AND WILL
CONTINUE DRIFT NORTH INTO NORTHERN WASHINGTON THIS AFTERNOON.
ANOTHER WAVE IS NOW MOVING INTO CENTRAL OREGON WHERE MOISTURE IS
HIGH FROM THE MORNING PRECIP AND TEMPS HAVE BOUNCED UP SOME THIS
AFTERNOON. THUS SCATTERED SHOWERS AND WIDELY SCATTERED THUNDERSTORMS
HAVE DEVELOPED ALONG THIS LINE. SO FAR THESE CELLS HAVE PRODUCED
SMALL HAIL AND VERY HEAVY RAINS AS THEY PASS BY. EXPECT STORMS TO
CONTINUE DEVELOPING AHEAD OF THIS WAVE AS IT MOVES NORTH AND
NORTHEAST. OTHER CELLS MAY PULSE UP AND DOWN SOUTH OF THIS SECOND
WAVE UNTIL SUNSET. WILL KEEP SOME MENTION OF ISOLATED TO SCATTERED
THUNDERSTORMS THROUGH THE EVENING FOR THE ENTIRE AREA. THE LOW OFF
THE CALIFORNIA COAST WILL KICK INTO THE SOUTHWEST U.S. MONDAY AS
ANOTHER LOW FROM THE GULF OF ALASKA MOVES TO A POSITION OFF THE
PACNW COAST. EXPECT THE MOISTURE FEED TO PERSIST THROUGH MONDAY AND
MORE SHOWERS CAN BE EXPECTED. ALSO ISOLATED THUNDERSTORMS WILL BE
POSSIBLE AGAIN MONDAY. BY TUESDAY SHOULD SEE THE MOISTURE FEED
WEAKEN SOME AS THE MAIN TAP WILL BE SHIFTED EAST WITH THE CALIFORNIA
LOW AS IT MOVES INTO THE PLAINS STATES. STILL AFTERNOON/EVENING
SHOWERS...A STRAY MOUNTAIN THUNDERSTORM...WILL BE POSSIBLE. 90

.LONG TERM...WEDNESDAY THROUGH SUNDAY...UNSETTLED WEATHER PATTERN IS
IN STORE FOR THE REST OF THE WEEK INTO THE WEEKEND. LOW PRESSURE
OVER THE EPAC WILL SLOWLY WORK ITS WAY TOWARD THE PACNW COAST. THIS
WILL SPIN DISTURBANCES INTO THE TWO STATE AREA AND WHEN COMBINING
WITH MOISTURE WILL PRODUCE SHOWERS ACROSS OUR AREA THIS WEEK. THE
UNSETTLED WEATHER WILL PERSIST INTO THE WEEKEND AS THE LOW DRIFTS
INLAND SATURDAY AND SUNDAY. TEMPERATURES WILL BE COOL REMAINING
SLIGHTLY BELOW NORMAL THROUGH THE PERIOD.

&&

.AVIATION...VFR CONDITIONS WILL PERSIST FOR THE NEXT 24
HOURS FOR ALL TAF SITES AND ALONG ALL TWEB ROUTES EXCEPT DURING
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS THIS AFTERNOON AND
EVENING WHEN MVFR CONDITIONS ARE LIKELY DUE TO MAINLY LOW CEILINGS
AND VSBY.

&&

.HYDROLOGY...RISING WATER LEVELS MAINLY DUE TO SNOWMELT ARE
BEGINNING TO SUBSIDE...WITH MOST LOCATIONS HAVE EITHER CRESTED OR
ARE NOW FALLING. RIVER LEVELS ALONG THE NACHES RIVER AT NACHES ARE
NOW SLOWLY FALLING...THE LEVELS WILL REMAIN ABOVE FLOOD STAGE UNTIL
TUESDAY. THUS THE FLOOD WARNING ON THE NACHES RIVER AT NACHES WILL
CONTINUE TO BE IN EFFECT. THE IMNAHA RIVER AT IMNAHA WILL FLUCTUATE
NEAR FLOOD STAGE DURING THE NEXT 24 HOURS...THEN WILL GRADUALLY FALL
TOWARDS BANKFULL. THE GRANDE RONDE RIVER AT TROY HAS CRESTED WILL
REMAIN BELOW FLOOD STAGE.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  54  73  52  73 /  40  50  30  30
ALW  56  75  54  74 /  40  50  30  30
PSC  57  79  54  79 /  40  50  30  20
YKM  53  76  51  75 /  40  50  30  20
HRI  53  77  51  77 /  40  50  30  20
ELN  50  75  49  73 /  50  50  30  20
RDM  45  71  43  70 /  40  50  30  20
LGD  51  70  48  70 /  40  50  50  30
5J0  49  69  47  70 /  40  60  30  30
DLS  55  75  53  74 /  40  50  30  20

&&

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

TI:GGG
FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON
90/97/97

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
820 PM PDT SAT MAY 20 2006

WAZ024-501-502-026>030-ORZ041>044-049-050-501>506-211215-
EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON-
EAST SLOPES OF THE SOUTHERN CASCADES OF WASHINGTON-
KITTITAS VALLEY-YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-
NORTHWEST BLUE MOUNTAINS-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-
820 PM PDT SAT MAY 20 2006

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

.DAY ONE...TONIGHT

FLOODING
     EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON

UNSEASONABLY WARM TEMPERATURES HAVE RESULTED IN RAPID SNOWMELT AT
HIGHER ELEVATIONS...CREATING HIGH WATER CONDITIONS ACROSS THE
VALLEY RIVER BASINS IN CENTRAL WASHINGTON AND EASTERN OREGON. A
FLOOD WARNING IS IN EFFECT FOR THE NACHES AND IMNAHA RIVERS. REFER
TO PDXFLWPDT WGUS76 KPDT FOR FURTHER DETAILS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORMS SUNDAY
     EASTERN COLUMBIA RIVER GORGE OF WASHINGTON, EAST SLOPES OF THE
     CENTRAL CASCADES OF WASHINGTON, EAST SLOPES OF THE SOUTHERN
     CASCADES OF WASHINGTON, KITTITAS VALLEY, YAKIMA VALLEY, LOWER
     COLUMBIA BASIN OF WASHINGTON, FOOTHILLS OF THE BLUE MOUNTAINS
     OF WASHINGTON, NORTHWEST BLUE MOUNTAINS, 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

FLOODING SUNDAY THROUGH TUESDAY
     EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON

THE NEXT SIGNIFICANT WAVE OF LOW PRESSURE...ALONG WITH MOIST
SOUTHERLY FLOW...AN UNSTABLE ATMOSPHERE AND FAVORABLE WINDS IN
THE LOWER AND MIDDLE LEVELS OF THE ATMOSPHERE WILL CREATE AN
ENVIRONMENT CONDUCIVE FOR THE FORMATION OF THUNDERSTORMS SUNDAY
AFTERNOON AND EVENING. ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE
ACROSS PORTIONS OF EASTERN OREGON AND SOUTHEAST WASHINGTON...WITH
THE STRONGER STORMS CAPABLE OF PRODUCING WIND GUSTS IN EXCESS OF
60 MPH AND HAIL UP TO ONE INCH IN DIAMETER.

SNOWMELT FLOODING WILL CONTINUE ALONG THE NACHES AND IMNAHA
RIVERS THROUGH TUESDAY. EXPECT UNSETTLED WEATHER TO LINGER THROUGH
MUCH OF NEXT WEEK.

.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/PENDLETON/CURRENTHAZARDS/HWO.HTML

ALL LETTERS IN THE ABOVE URL ARE LOWER CASE...EXCEPT THE H IN
CURRENTHAZARDS.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OR
1247 PM PDT SUN MAY 21 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1246 PM     HEAVY RAIN       4 N PRINEVILLE          44.37N 120.84W
05/21/2006  M1.30 INCH       CROOK              OR   TRAINED SPOTTER

            1.30 INCHES OF RAIN IN APPROXIMATELY 20 MINUTES. PEA SIZE
            HAIL OBSERVED.

&&

JAS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OR
518 PM PDT SUN MAY 21 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0505 PM     HAIL             8 SW ELGIN              45.48N 118.04W
05/21/2006  M1.00 INCH       UNION              OR   PUBLIC

&&

VPAPOL