Severe Thunderstorm Warning 8, NWS Pendleton, OR

356 
WWUS56 KPDT 162128
SVSPDT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PENDLETON OR
228 PM PDT SAT JUL 16 2011

ORC059-061-162200-
/O.CON.KPDT.SV.W.0008.000000T0000Z-110716T2200Z/
UNION OR-UMATILLA OR-
228 PM PDT SAT JUL 16 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM PDT
FOR EAST CENTRAL UMATILLA AND CENTRAL UNION COUNTIES...

AT 217 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE 2 SEVERE THUNDERSTORMS. ONE STORM STORM WAS LOCATED NEAR 
STARKEY...OR 13 MILES WEST OF LA GRANDE...MOVING NORTHEAST AT 35 MPH.
THE OTHER STORM WAS NORTHEAST OF MEACHAM.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
KAMELA...MEACHAM...ISLAND CITY...IMBLER...SUMMERVILLE AND ELGIN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 60 MPH ARE LIKELY. FOR
YOUR PROTECTION MOVE TO A STURDY SHELTER UNTIL THE STORM PASSES.

&&

LAT...LON 4524 11790 4516 11791 4513 11792 4512 11798
      4511 11800 4509 11803 4511 11809 4515 11814
      4510 11824 4510 11832 4512 11838 4513 11842
      4518 11853 4564 11851 4568 11786
TIME...MOT...LOC 2124Z 216DEG 31KT 4532 11829

$$

RC

006 
WWUS56 KPDT 162204
SVSPDT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PENDLETON OR
304 PM PDT SAT JUL 16 2011

ORC059-061-162210-
/O.EXP.KPDT.SV.W.0008.000000T0000Z-110716T2200Z/
UNION OR-UMATILLA OR-
304 PM PDT SAT JUL 16 2011

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL UMATILLA AND
CENTRAL UNION COUNTIES HAS EXPIRED...

THE SEVERE THUNDERSTORM WARNING HAS EXPIRED...HOWEVER A STRONG 
THUNDERSTORM CONTINUES TO MOVE ACROSS EASTERN UMATILLA COUNTY 
BETWEEN MEACHAM AND THORN HOLLOW. THE STORM WAS MOVING NORTH AT 35 
MPH.

LAT...LON 4524 11790 4516 11791 4513 11792 4512 11798
      4511 11800 4509 11803 4511 11809 4515 11814
      4510 11824 4510 11832 4512 11838 4513 11842
      4518 11853 4564 11851 4568 11786
TIME...MOT...LOC 2128Z 216DEG 31KT 4535 11826

$$

RC

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1049 AM PDT SAT JUL 16 2011

UPDATED AVIATION DISCUSSION

.SHORT TERM...AN UPPER LEVEL TROUGH OFFSHORE HAS TAKEN A SLIGHT
NEGATIVE TILT...PROVIDING UPPER LEVEL DYNAMICS TO A WAVE CURRENTLY
OVER EASTERN OREGON.  ISOLATED THUNDERSTORMS CONTINUE TO BE OBSERVED
FROM THE LOWER COLUMBIA BASIN EAST TO THE IDAHO BORDER.
THUNDERSTORMS WILL EXPAND IN COVERAGE LATER TODAY AS A STRONGER WAVE
CURRENTLY OVER THE WILLAMETTE VALLEY SWINGS NE.  A MID LEVEL JET
NEAR HELLS CANYON WILL RESULT IN ORGANIZED CONVECTION OVER SE
WASHINGTON AND NE OREGON WITH THE POTENTIAL FOR STRONG
THUNDERSTORMS.  BASED ON THE AMOUNT OF SHEAR AND
INSTABILITY...BELIEVE AN ISOLATED SEVERE STORM IS ALSO
POSSIBLE...PRIMARILY IN COLUMBIA, UNION, AND WALLOWA COUNTIES. THE
FAST MOVING WAVE WILL EXIT THE REGION AFTER SUNSET...THUS
THUNDERSTORM ACTIVITY WILL DECREASE CONSIDERABLY THIS EVENING.
CURRENT FORECAST IS ON TRACK AND NO UPDATES PLANNED AT THIS TIME.
JOHNSON

&&

.AVIATION...18Z TAFS...VFR CONDITIONS ARE EXPECTED TO PREVAIL TODAY
AND TONIGHT. HOWEVER...A WEATHER SYSTEM MOVING ACROSS THE REGION
TODAY WILL BRING ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS TO
ALL AREAS THROUGH 22Z THIS AFTERNOON IN THE WEST AND THROUGH 04Z
THIS EVENING IN THE EAST. CONDITIONS MAY BRIEFLY DROP TO MVFR IN THE
IMMEDIATE VICINITY OF SHOWERS AND/OR THUNDERSTORMS THROUGH THIS
AFTERNOON AND EVENING. CONDITIONS WILL IMPROVE AND SHOWERS WILL END
AFTER 06Z. WINDS WILL BE GENERALLY 5 TO 15 KTS THIS MORNING...BUT
THEN WILL INCREASE TO 10 TO 20 KTS WITH GUSTS TO 25 KTS THIS
AFTERNOON AND EVENING...ESPECIALLY AT KDLS...KPSC AND KALW. WINDS
WILL BECOME LIGHT AGAIN AND UNDER 10 KTS AFTER 06Z TONIGHT. PERRY

&&

.PREV DISCUSSION... /ISSUED 250 AM PDT SAT JUL 16 2011/

SHORT TERM...TODAY THROUGH MONDAY MORNING...WITH THE UPPER TROUGH
STILL ALONG THE COAST SUNDAY AND SUNDAY NIGHT, THE REGION WILL
REMAIN UNDER AN SOUTHERLY FLOW WHICH WOULD PROVIDE FOR SOME
INSTABILITY IN THE AFTERNOON AND EVENING SUNDAY. THUS WILL CONTINUE
TO INDICATE A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS OVER THE
NORTHEAST MOUNTAIN ZONES, AND SOME SHOWERS NEAR THE CASCADE CREST.
AFTERNOON TEMPS SUNDAY SHOULD BE A BIT WARMER THAN THIS AFTERNOON
DUE THERE BEING MORE SUNSHINE SUNDAY. 90

LONG TERM...MONDAY AFTERNOON THROUGH SATURDAY...A DEEP UPPER LOW
PRESSURE SYSTEM WILL REMAIN OFF THE SW OREGON AND NW CALIFORNIA
COAST ON MONDAY WITH A DEEP SOUTHERLY FLOW ALOFT OVER THE FORECAST
AREA. WHILE THIS MEANS VERY WARM WEATHER IT ALSO MEANS THAT THERE
WILL BE CLOUDS AND A DAILY CHANCE OF SHOWERS AND AFTERNOON
THUNDERSTORMS...ESPECIALLY IN THE CENTRAL AND NORTHEAST MOUNTAINS AS
WELL AS ALONG THE CASCADE EAST SLOPES. THE UPPER LOW WILL GRADUALLY
LIFT TO THE NORTHEAST ON TUESDAY INTO SW OREGON. THIS WILL CAUSE
INSTABILITY AND MID LEVEL MOISTURE AND INSTABILITY TO INCREASE. THE
TROUGH WILL PASS OVER THE FORECAST AREA DURING THE DAY ON TUESDAY...
MAKING IT THE DAY WITH THE BEST CHANCE OF SHOWERS AND AFTERNOON AND
EVENING THUNDERSTORMS. THE UPPER LOW WILL HAVE OPENED UP TO AN UPPER
TROUGH BY THAT TIME. A DRIER AND MORE STABLE WESTERLY FLOW WILL THEN
TAKE OVER ON WEDNESDAY WITH A PUSH OF COOLER MARINE AIR FROM OFF THE
PACIFIC. THE OVERALL REGION WILL STILL BE UNDER A BROAD UPPER LEVEL
TROUGH...BUT IT WILL NOT BE AS AMPLIFIED NOR WILL IT CONTAIN
SIGNIFICANT MOISTURE OR INSTABILITY...AT LEAST NOT FOR WEDNESDAY AND
THURSDAY. HOWEVER BY THURSDAY THE LONG RANGE MODELS ARE SHOWING VERY
SIGNIFICANT DIFFERENCES BY THEN...ESPECIALLY BETWEEN THE EUROPEAN
AND GFS MODELS. WILL THEREFORE LEAVE THE FORECAST ALONE FOR THAT
TIME PERIOD. TEMPERATURES WILL BE AROUND NORMAL...OR PERHAPS JUST
SLIGHTLY BELOW NORMAL AT TIMES DUE TO CLOUDS AND SHOWERS. 88

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  83  55  85  57 /  40  30  10  10
ALW  84  58  87  62 /  40  40  10  10
PSC  87  56  89  60 /  30  30  10  10
YKM  81  51  83  56 /  30  20  10  10
HRI  86  57  88  59 /  30  30  10  10
ELN  80  54  83  57 /  40  20  20  20
RDM  76  47  81  48 /  40  20  10  10
LGD  81  50  85  53 /  50  50  20  20
GCD  80  50  82  51 /  40  30  10  10
DLS  78  58  80  60 /  30  20  10  10

&&

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

THREAT INDEX
TODAY : YELLOW
SUNDAY : GREEN
MONDAY : 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

85/83

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
528 AM PDT SAT JUL 16 2011

ORZ041-042-044-049-050-502-503-505>509-WAZ024-026>030-520-521-
171215-
EASTERN COLUMBIA RIVER GORGE OF OREGON-NORTH CENTRAL OREGON-
LOWER COLUMBIA BASIN OF OREGON-GRANDE RONDE VALLEY-WALLOWA COUNTY-
NORTHERN BLUE MOUNTAINS OF OREGON-
SOUTHERN BLUE MOUNTAINS OF OREGON-JOHN DAY BASIN-OCHOCO-
JOHN DAY HIGHLANDS-
FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON-
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-
EAST SLOPES OF THE OREGON CASCADES-
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 WASHINGTON CASCADES-SIMCOE HIGHLANDS-
528 AM PDT SAT JUL 16 2011

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 WASHINGTON CASCADES, SIMCOE HIGHLANDS,
     EASTERN COLUMBIA RIVER GORGE OF WASHINGTON, KITTITAS VALLEY,
     YAKIMA VALLEY, LOWER COLUMBIA BASIN OF WASHINGTON, EASTERN
     COLUMBIA RIVER GORGE OF OREGON, NORTH CENTRAL OREGON, EAST
     SLOPES OF THE OREGON CASCADES, LOWER COLUMBIA BASIN OF OREGON,
     FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON

STRONG THUNDERSTORMS
     FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON, NORTHWEST BLUE
     MOUNTAINS OF WASHINGTON, GRANDE RONDE VALLEY, WALLOWA COUNTY,
     FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON, NORTHERN
     BLUE MOUNTAINS OF OREGON, SOUTHERN BLUE MOUNTAINS OF OREGON,
     JOHN DAY BASIN, OCHOCO-JOHN DAY HIGHLANDS

A DISTURBANCE SWINGING THROUGH THE BOTTOM OF AN UPPER LEVEL TROUGH
OFF THE PACIFIC NORTHWEST COAST WILL MOVE ACROSS THE REGION TODAY,
EXITING BY MID TO LATE EVENING. THIS SYSTEM WILL BRING ISOLATED TO
SCATTERED SHOWERS AND THUNDERSTORMS TO ALL AREAS INTO THIS EVENING.
WIND SHEAR LOOKS TO BE STRONG ENOUGH TO CAUSE A FEW THUNDERSTORMS
CAPABLE OF WIND GUSTS OF 40 TO 50 MPH AND HAIL OF A AROUND ONE HALF
INCH IN DIAMETER. THE AREAS THAT MAY SEE THESE TYPES OF STORMS ARE
LISTED UNDER THE STRONG THUNDERSTORM HEADLINE ABOVE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORMS SUNDAY
     NORTHWEST BLUE MOUNTAINS OF WASHINGTON, GRANDE RONDE VALLEY,
     WALLOWA COUNTY, NORTHERN BLUE MOUNTAINS OF OREGON, SOUTHERN
     BLUE MOUNTAINS OF OREGON

THE UPPER TROUGH LOOKS TO REMAIN OFFSHORE SUNDAY THROUGH TUESDAY.
THIS WILL KEEP THE REGION UNDER A WARM AND POTENTIALLY UNSTABLE AIR
MASS THROUGH TUESDAY. AS A RESULT, SOME AREAS MAY SEE CHANCES FOR
AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS SUNDAY THROUGH
TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED TODAY.

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.