Flash Flood and Hail in Oregon, June 4, 2007

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
215 PM PDT MON JUN 4 2007

.SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT...AN UPPER LEVEL LOW
IS SPINNING OFF THE COAST WITH A SURFACE FRONT MOVING ACROSS EASTERN
WASHINGTON AND OREGON. SO FAR THERE HAVE BEEN A FEW LIGHTNING
STRIKES ALONG THE CASCADES WHERE TERRAIN AND THE SURFACE COLD FRONT
COMBINED TO TRIGGER A FEW THUNDERSTORMS. EXPECT THESE STORMS TO MOVE
NORTH OUT OF THE AREA IN A FEW HOURS. THERE IS SOME CLEARING BEHIND
THE FRONT...BUT IT IS ALREADY STARTING TO FILL IN AS ANOTHER WAVE IS
OVER THE COAST MOVING INLAND. THE BREAKS WILL ALLOW SURFACE HEATING
IN NORTHEAST OREGON AND THE NORTHERN BLUES. OROGRAPHIC EFFECTS...
DYNAMIC LIFT...AND LIMITED HEATING MAY TRIGGER A FEW THUNDERSTORMS
OVER THE NORTHEAST OREGON MOUNTAINS THIS EVENING. SCATTERED TO
ISOLATED SHOWERS THIS MORNING HAVE INCREASED THE MOISTURE BY
EVAPORATING INTO LOWER LAYERS. THEREFORE MORE OF THE SHOWERS FROM
THE NEXT WAVE WILL REACH THE ROUND...SO QPF SHOULD INCREASE TONIGHT.
MULTIPLE BANDS WILL ROTATE AROUND THE LOW OVER THE PACIFIC NORTHWEST
TONIGHT AND TOMORROW. THE UPPER LOW WILL STRETCH OUT OVER WASHINGTON
AND OREGON WEDNESDAY. THE UPPER LOW WILL DEVELOP A LARGER DRY SLOT
WITH TIME SO THERE WILL BE MORE BREAKS AND FEWER SHOWERS AS IT
PASSES OVER WEDNESDAY AND WEDNESDAY NIGHT.

TEMPERATURES ARE IN SOUTHEAST WASHINGTON 14 (YAKIMA) TO 25 (STAMPEDE
PASS) DEGREES THAN 24 HOURS AGO AT 1 PM PDT. IN NORTHEAST OREGON IT
WAS 4 (REDMOND) TO 15 (PENDLETON AND MEACHAM) COOLER. CLOUD COVER
AND WINDS WILL KEEP TEMPERATURES IN THE 40S AND 50S TONIGHT. AS COLD
AIR FILTERS IN WITH THE UPPER LEVEL LOW AFTERNOON HIGH TEMPERATURES
WILL BE EVEN COOLER TUESDAY AND WEDNESDAY. WITH SOME CLEARING
TUESDAY NIGHT AND WEDNESDAY...NIGHT TIME LOWS WILL BE IN THE 30S AND
40S.   COONFIELD

.LONG TERM...THURSDAY THROUGH MONDAY.  ON THURSDAY...THE UPPER LEVEL
TROUGH WILL BE EXITING THE REGION WITH A FEW SHOWERS OVER THE
MOUNTAINS. DRY CONDITIONS ARE EXPECTED THROUGH SATURDAY AS WEST TO
NORTHWEST FLOW PREVAILS.  SATURDAY NIGHT...ANOTHER LOW PRESSURE
SYSTEM WILL BE MOVING INTO WESTERN CANADA WITH A WEAK FRONT TO MOVE
THROUGH THE AREA SATURDAY NIGHT AND SUNDAY WITH MAINLY MOUNTAIN
SHOWERS.  TEMPERATURES WILL BE NEAR TO SLIGHTLY BELOW SEASONAL
LEVELS. 93

&&
.AVIATION...ISOLATED THUNDERSTORMS WILL BE POSSIBLE ALONG A COOL
FRONT THAT WILL MOVE FROM THE EAST SLOPES OF THE CASCADES TO THE
IDAHO BORDER BY 06Z.  MVFR CONDITIONS FOR CEILING AND VISIBILITY
ALONG WITH GUSTY WINDS WILL BE POSSIBLE WITH THE STRONGEST STORMS.
WIDESPREAD LIGHT RAIN WILL MOVE IN BY EARLY MORNING AND WILL
CONTINUE THROUGH TUESDAY AFTERNOON. VFR CONDITIONS ARE EXPECTED. 93

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  55  68  46  67 /  60  50  20  10
ALW  57  65  49  66 /  60  50  20  10
PSC  59  75  48  72 /  60  40  20  10
YKM  55  71  44  68 /  50  40  20  10
HRI  59  72  47  70 /  60  50  20  10
ELN  54  68  46  63 /  60  40  20  10
RDM  46  59  33  59 /  50  50  30  20
LGD  52  62  41  60 /  50  60  40  20
GCD  52  67  38  62 /  40  70  40  20
DLS  58  68  50  65 /  50  40  20  10

&&

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

TI:GGG
FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON
76/93/93

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1113 AM PDT MON JUN 4 2007

ORZ041-WAZ024-501-502-026>030-ORZ042>044-049-050-501>506-051215-
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-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-
1113 AM PDT MON JUN 4 2007

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS
     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,
     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

ISOLATED THUNDERSTORMS ARE POSSIBLE ACROSS EASTERN WASHINGTON AND
OREGON TODAY AS A COLD FRONT SLOWLY MOVES ACROSS THE REGION. GUSTY
WINDS AND HEAVY RAIN MAY BE POSSIBLE WITH THESE STORMS. AFTER THE
FRONTAL PASSAGE...SHOWERS AND BREEZY CONDITIONS WILL PERSIST
UNTIL THE UPPER LEVEL TROUGH PASSES.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE UPPER LEVEL TROUGH WILL BRING COOL TEMPERATURES AND A SLIGHT
CHANCE FOR SHOWERS TO THE MOUNTAINS THROUGH THE MIDDLE OF THE
WEEK. A WEAK RIDGE WILL BRING TEMPORARY DRY CONDITIONS INTO THE
WEEKEND.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.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
400 PM PDT MON JUN 04 2007

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

0400 PM     HAIL             1 N HARDMAN             45.17N 119.68W
06/04/2007  E0.50 INCH       MORROW             OR   TRAINED SPOTTER

&&

JAS