Area Forecast Discussion
Issued by NWS Pendleton, OR

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS66 KPDT 050337
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
837 PM PDT SAT JUL 4 2015

.UPDATE...MONSOONAL MOISTURE IN THE MID TO UPPER LEVELS CONTINUE
TO WRAP AROUND A BROAD UPPER LEVEL LOW WITH EMBEDDED SMALLER
CIRCULATIONS. ONE SUCH DISTURBANCE WAS MOVING NORTH THROUGH
WESTERN NEVADA THIS EVENING WITH THUNDERSTORMS ACTIVE THROUGHOUT
NORTHERN NEVADA...NORTHERN CALIFORNIA...AND SOUTHERN OREGON. ONCE
MORE...THE DRY AIR IN PLACE OVER CENTRAL OREGON AND POINTS
NORTHWARD CONTINUES TO LIMIT ANY CONVECTION FROM FORMING. MID AND
UPPER LEVEL MOISTURE WILL CONTINUE TO MOVE INTO THE REGION
TOMORROW WITH A SLIGHT CHANCE OF THUNDERSTORMS POSSIBLE OVER FAR SOUTHERN
DESCHUTES COUNTY AND THE WALLOWA MOUNTAINS. FIRE WEATHER CONCERNS
ARE DISCUSSED BELOW.

&&

.AVIATION...06Z TAFS...DISSIPATING THUNDERSTORMS OVER SOUTHERN
OREGON WITH CONTINUED MOISTURE MONSOONAL MOISTURE ADVECTION WILL
BRING HIGH CLOUDS TO TAF SITES THROUGH THE PERIOD. A PASSING
DISTURBANCE OVER WASHINGTON STATE WILL ELEVATE WINDS BTWN 10 TO 20
KTS FOR KYKM AND KPSC THRU 05/18Z. OTHERWISE...DIURNAL WINDS WILL
DECREASE TO AOB 10 KTS TONIGHT BECOMING 5 TO 15 KTS DURING THE
DAY TOMORROW. BIEDA

&&

.FIRE WEATHER...THE RED FLAG WARNING IN EFFECT FOR PORTIONS OF THE
COLUMBIA BASIN...EASTERN COLUMBIA RIVER GORGE...AND NORTH CENTRAL
TO CENTRAL OREGON HAVE BEEN ALLOWED TO EXPIRE THIS EVENING. WINDS
HAVE TAPERED OFF TO BETWEEN 5 TO 10 MPH AND RELATIVE HUMIDITY
RECOVERY IS EXPECTED TO BE BETTER THAN PRIOR NIGHTS AS MONSOONAL
MOISTURE CONTINUES TO SLOWLY BE PUMPED IN FROM THE SOUTH. THE
WARNING FOR THE HANFORD DISTRICT AND THE YAKIMA VALLEY WILL REMAIN
IN EFFECT THROUGH SUNDAY MORNING AS A PASSING WEATHER DISTURBANCE
WILL BRING INCREASED NORTHERLY WINDS. LATEST MODEL GUIDANCE FROM
THE HRRR AND 00Z NAM CONTINUE TO SHOW THE POTENTIAL FOR INCREASED
NORTHERLY WINDS BETWEEN 10 TO 20 MPH WITH GUST UP TO 35 MPH
THROUGH MIDDAY SUNDAY. ONCE THIS SYSTEM PASSES...FIRE WEATHER
CONCERNS WILL SHIFT TO THE INCREASING POTENTIAL FOR THUNDERSTORMS
DUE TO INCREASING MONSOONAL MOISTURE FROM SOUTHEASTERLY FLOW. THE
FIRST MENTION OF THUNDERSTORMS WILL BE OVER THE WALLOWA MOUNTAINS
ON SUNDAY WITH CHANCES IMPROVING FURTHER NORTH AS THE WORK WEEK
PROGRESSES. WISTER/BIEDA

&&

.PREV DISCUSSION... /ISSUED 240 PM PDT SAT JUL 4 2015/

SHORT TERM...TODAY THROUGH TUESDAY...ANOTHER HOT AND DRY AFTERNOON
OUT THERE TODAY WITH NEAR RECORD HIGH TEMPERATURES EXPECTED. AN AREA
OF MID TO HIGH LEVEL CLOUDS CONTINUES TO GRADUALLY MOVE NORTH ACROSS
MUCH OF OUR OREGON FORECAST ZONES THIS AFTERNOON. THE MOST EXTENSIVE
AND THICKER CLOUD COVER IS CONFINED TO THE OCHOCO-JOHN DAY HIGHLANDS
AND CENTRAL OREGON...WHERE TEMPERATURES ARE BEING HELD DOWN SOMEWHAT
COMPARED TO YESTERDAY. THESE CLOUDS ARE EXPECTED TO LIFT NORTH INTO
EXTREME SOUTHERN WASHINGTON THIS EVENING BEFORE SHIFTING BACK SOUTH
THROUGH THE DAY ON SUNDAY AS AN UPPER LEVEL TROUGH MOVES THROUGH
SHIFTING THE FLOW TO NORTH-NORTHWESTERLY. THIS DISTURBANCE IS NOT
EXPECTED TO BRING ANY PRECIPITATION TO THE AREA...HOWEVER WINDS ARE
FORECAST TO INCREASE ACROSS THE NORTHERN COLUMBIA BASIN OF
WASHINGTON...THE KITTITAS AND YAKIMA VALLEYS DURING THE EVENING AND
OVERNIGHT HOURS. SEE THE FIRE WEATHER SECTION BELOW FOR MORE DETAILS
ON EXPECTED WIND SPEEDS. THIS INCREASE IN WIND SPEEDS MAY CAUSE
PATCHY AREAS OF BLOWING DUST IN THESE AREAS STARTING LATE THIS
EVENING THROUGH THE EARLY AFTERNOON HOURS SUNDAY. BEHIND THIS WEAK
DISTURBANCE CONDITIONS WILL REMAIN BREEZY THROUGH AT LEAST THE EARLY
AFTERNOON HOURS ON SUNDAY...TEMPERATURES ARE EXPECTED TO BE A FEW
DEGREES COOLER TOMORROW...WITH HIGHS MAINLY 95-101 IN THE LOWER
ELEVATIONS AND 80S TO LOWER 90S IN THE MOUNTAINS. BY SUNDAY
AFTERNOON AND EARLY EVENING THERE WILL BE A SLIGHT CHANCE FOR A
SHOWER OR THUNDERSTORM OVER THE WALLOWA MOUNTAINS AND EXTREME
SOUTHERN DESCHUTES COUNTIES...OTHERWISE IT SHOULD REMAIN DRY. MONDAY
AND TUESDAY WILL CONTINUE TO SEE ABOVE AVERAGE TEMPERATURES WITH
HIGHS EXPECTED TO BE IN THE MID-90S TO LOWER 100S FOR THE VALLEYS
AND BASINS EACH DAY. THERE WILL ALSO BE A SLIGHT CHANCE FOR FOR
AFTERNOON/EVENING SHOWERS AND THUNDERSTORMS ACROSS THE SOUTHERN
PORTION OF OUR CWA ON MONDAY AND ESPECIALLY TUESDAY AS MORE
INSTABILITY AND MOISTURE WORK INTO THE AREA AHEAD OF AN UPPER LEVEL
LOW. 77

LONG TERM...TUESDAY NIGHT THROUGH SATURDAY. UPPER LEVEL LOW PRESSURE
SYSTEM WILL BE APPROACHING THE REGION BY WEDNESDAY AND IS EXPECTED
TO MOVE THROUGH THE AREA BY SATURDAY.  ON WEDNESDAY THE LOW IS STILL
FAR ENOUGH SOUTH AND WEST OF THE AREA WITH ONLY A SLIGHT CHANCE OF
THUNDERSTORMS OVER SOUTHERN OREGON.  AS THE LOW MOVES INLAND
SCATTERED SHOWERS AND THUNDERSTORM WILL SPREAD NORTH AND EAST ACROSS
OREGON...BUT IT WILL REMAIN DRY AND WARM OVER EASTERN WASHINGTON.
THE LOW PRESSURE SYSTEM WILL BE MOVING OUT OF THE REGION FRIDAY
NIGHT AND EARLY SATURDAY WITH COOLER TEMPERATURES AND SOME GUSTY
WINDS.  93

AVIATION...00Z TAFS...VFR CONDITIONS WILL PREVAIL OVER THE NEXT 24
HOURS.  SCT-BKN CIRRUS AT 25K FEET WILL CONTINUE OVER MAINLY OREGON
OVERNIGHT WITH INCREASINGLY WEST TO NORTHWEST FLOW OVER WASHINGTON
AS WEAK WEATHER SYSTEM MOVES THROUGH SOUTHERN CANADA.  WEST TO
NORTHWEST WIND 10-20KTS WILL PERSIST THROUGH 06Z AT KDLS AND KPDT
AND 10 KTS AND LESS AT OTHER TAFS SITES. 93

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  98  65  97  64 /   0   0   0   0
ALW  99  71  96  69 /   0   0   0   0
PSC 104  69 100  66 /   0   0   0   0
YKM 100  68  98  67 /   0   0   0   0
HRI 101  67  99  65 /   0   0   0   0
ELN 102  65  98  63 /   0   0   0   0
RDM  94  56  94  58 /   0   0   0   0
LGD  97  58  91  57 /   0   0   0   0
GCD  96  59  95  57 /   0   0   0   0
DLS 100  69 101  69 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...RED FLAG WARNING UNTIL 9 AM PDT SUNDAY FOR WAZ675.

&&

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

$$

98/93/98



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.