Lightning Strike and Heavy Rain in Oregon, June 3, 2009

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1108 AM PDT WED JUN 3 2009

UPDATED WATCHES/WARNINGS/ADVISORIES SECTION

.SHORT TERM...UPDATE...DEEP SUBTROPICAL MOISTURE REMAINS OVER THE
REGION...WITH DEEPEST MOISTURE OVER OUR OREGON ZONES. OVERALL CLOUD
COVER IS THINNER THIS MORNING THAN YESTERDAY AT THIS TIME ACROSS
EASTERN OREGON. AS SUCH EXPECT BETTER DAYTIME HEATING AND MORE
INSTABILITY THIS AFTERNOON...RESULTING IN BETTER SHOWER AND
THUNDERSTORM DEVELOPMENT. STORMS TODAY STILL LOOK TO MAINLY BE
PRODUCERS OF BRIEF HEAVY RAIN...THOUGH SMALL HAIL AND WIND GUSTS
TO 30 MPH COULD OCCUR.

CURRENT FORECASTS LOOK FINE AT THIS TIME. A FEW SHOWERS HAVE BEEN
OCCURRING OVER NORTH-CENTRAL OREGON AND DID UPDATE TO MENTION THESE.
AT THE SAME TIME...HAVE REMOVED MENTION OF MORNING SHOWERS OVER
PORTIONS OF OUR NORTHEASTERN MOST ZONES. OTHER UPDATES INCLUDED
DECREASING CLOUD COVER THIS MORNING OVER OUR NORTHERN ZONES AND
ALTERING SOME WIND SPEEDS AND DIRECTIONS FOR TODAY AND/OR TONIGHT.
90

.LONG TERM...PREVIOUS DISCUSSION...THE UPPER LOW WILL MOVE INTO THE
GREAT BASIN ON FRIDAY...ALLOWING THE AMBIENT FLOW TO BECOME MORE
NORTHERLY. HOWEVER...THE LINGERING SUBTROPICAL AIRMASS WILL KEEP THE
REGION UNSTABLE...CREATING THE POSSIBILITY FOR WIDESPREAD SHOWERS
AND THUNDERSTORMS. AS THE LOW PROGRESSES EASTWARD ON SATURDAY...
PRECIPITATION CHANCES WILL DECREASE...ALTHOUGH SHOWERS AND
THUNDERSTORMS WILL STILL BE POSSIBLE ACROSS MUCH OF EASTERN OREGON.
NORTHWESTERLY FLOW IS EXPECTED TO DEVELOP OVER THE AREA ON
SUNDAY...BRINGING DRIER CONDITIONS TO MOST OF WASHINGTON AS WELL AS
THE LOWER COLUMBIA BASIN. IN THE HIGHER TERRAIN OF EASTERN
OREGON...UPSLOPE FLOW WILL SUPPORT A CHANCE OF SHOWERS WITH A SLIGHT
CHANCE OF AFTERNOON/EVENING THUNDERSTORMS EACH DAY THROUGH THE END
OF THE PERIOD. TEMPERATURES WILL REMAIN ABOVE NORMAL NORMAL THROUGH
THE MIDDLE OF NEXT WEEK.

&&

.AVIATION...18Z TAFS. VFR CONDITIONS AND WINDS LESS THAN 15 KTS
WILL PREVAIL AT MOST TAF SITES FOR THE NEXT 24 HOURS.  THE ONLY
EXCEPTION MAY BE AT KRDM WHERE THERE IS A CHANCE OF MVFR OR LESS
SHOULD T-STORMS WITH HEAVY RAIN DEVELOP.  MOISTURE ASSOCIATED WITH
THE UPPER LOW OFF CALIFORNIA WILL SPREAD NORTH OVER EASTERN
WASHINGTON TONIGHT AND THURSDAY MORNING.  THE AIR MASS IS
UNSTABLE...AND I WOULD NOT BE SURPRISED TO SEE CB DEVELOPMENT AT ANY
OF OUR TAF SITES BEFORE 18Z THURSDAY.  JOHNSON

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  86  55  81  56 /  20  20  50  40
ALW  87  58  85  59 /  20  20  40  40
PSC  91  58  91  57 /  10  10  10  10
YKM  88  60  93  57 /   0   0  10  10
HRI  88  52  86  56 /  10  10  40  40
ELN  89  53  91  54 /   0   0  10  10
RDM  78  52  72  47 /  40  50  60  60
LGD  80  53  79  52 /  30  30  50  50
GCD  77  55  76  51 /  40  40  50  50
DLS  90  56  86  58 /  10  10  30  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...FLOOD WARNING REMAINS IN EFFECT FOR THE NACHES RIVER NEAR
     NACHES AFFECTING YAKIMA COUNTY THROUGH WEDNESDAY EVENING.

&&

TI:GYG
FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON
90/82/85

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1150 AM PDT WED JUN 3 2009

UPDATED FOR RISK OF SEVERE THUNDERSTORMS FOR THURSDAY

ORZ041>044-049-050-501>506-WAZ024-026>030-501-502-041415-
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-
EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON-
EAST SLOPES OF THE SOUTHERN CASCADES OF WASHINGTON-
1150 AM PDT WED JUN 3 2009

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

.DAY ONE...TODAY AND TONIGHT

FLOODING
     YAKIMA VALLEY

THUNDERSTORMS
     FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON, NORTHWEST BLUE
     MOUNTAINS, NORTH CENTRAL OREGON, CENTRAL 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

VERY WARM TEMPERATURES AND RAPID SNOW MELT OVER THE CASCADES OF
CENTRAL WASHINGTON WILL KEEP HIGH WATER LEVELS ON THE NACHES RIVER.
A FLOOD WARNING REMAINS IN EFFECT FOR THE NACHES RIVER NEAR NACHES.
PLEASE REFER TO NWS PRODUCT ID PDXFLSPDT FOR MORE DETAILS ON THESE
HIGHLIGHTS.

ISOLATED TO SCATTERED THUNDERSTORMS WILL DEVELOP AGAIN THIS
AFTERNOON AND TONIGHT AS A RESULT OF WARM AND UNSTABLE AIR IN A
SOUTHERLY FLOW ALOFT OVER CENTRAL AND EASTERN AREAS OF OREGON. SOME
THUNDERSTORMS MAY PRODUCE HEAVY DOWNPOURS...PARTICULARLY IN CENTRAL
OREGON.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY
     CENTRAL OREGON, OCHOCO-JOHN DAY HIGHLANDS

THUNDERSTORMS THURSDAY
     EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON, EAST SLOPES
     OF THE SOUTHERN CASCADES OF WASHINGTON, EASTERN COLUMBIA RIVER
     GORGE OF WASHINGTON, LOWER COLUMBIA BASIN OF WASHINGTON,
     FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON, NORTHWEST BLUE
     MOUNTAINS, EASTERN COLUMBIA RIVER GORGE OF OREGON, NORTH
     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

THUNDERSTORMS FRIDAY
     EAST SLOPES OF THE SOUTHERN CASCADES OF WASHINGTON, EASTERN
     COLUMBIA RIVER GORGE 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

THUNDERSTORMS WILL DEVELOP THURSDAY OVER MOST OF THE AREA. THE BEST
CHANCE FOR THUNDERSTORMS WILL BE IN CENTRAL OREGON THROUGH
DESCHUTES, CROOK AND GRANT COUNTIES...BUT ISOLATED STORMS WILL
EXTEND INTO SOUTHEAST WASHINGTON. THE STORM PREDICTION CENTER IN
NORMAN, OKLAHOMA, HAS PLACED CENTRAL OREGON AND THE OCHOCO-JOHN DAY
HIGHLANDS IN A SLIGHT RISK OF SEVERE STORMS FOR THURSDAY.  THE MAIN
THREAT FROM THESE THUNDERSTORMS WILL BE HEAVY RAIN AND LARGE HAIL.
SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WILL REDEVELOP ON
FRIDAY OVER EASTERN OREGON. ISOLATED STORMS MAY DEVELOP IN SOUTHEAST
WASHINGTON FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED OVER THE NEXT SEVERAL DAYS DUE TO
THUNDERSTORMS AND LOCALIZED FLOODING.

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...EXCEPT THE H IN
CURRENTHAZARDS.