Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 300515
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1016 PM PDT SUN MAR 29 2015

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT AND MONDAY...RIDGE OF HIGH PRESSURE WILL
REMAIN OVER THE REGION DURING THIS PERIOD. EXPECT TEMPERATURES TO BE
A LITTLE WARMER OVERNIGHT AND ON MONDAY SO BUMPED THEN UP SLIGHTLY
IN AN EVENING FORECAST UPDATE BASED ON THE MAX AND MIN TEMPERATURES
OF SUNDAY. ALSO DECREASED SKY COVER TO BE MOSTLY CLEAR AS MOST OF
THE CLOUDS WILL BE HIGH THIN BASED CIRRUS. WINDS WILL CONTINUE TO BE
LIGHT.

.AVIATION...06Z TAFS...VFR CONDITIONS WILL CONTINUE FOR THE NEXT 24
HOURS. CEILINGS WILL BE SCATTERED TO BROKEN ABOVE 15K FEET THOUGH
SOME CUMULUS WILL DEVELOP OVER THE MOUNTAINS AFTER 20Z TOMORROW
AFTERNOON. WINDS ARE EXPECTED TO BE GENERALLY BELOW 12 KTS FOR THE
NEXT 24 HOURS THOUGH KDLS WILL REACH 10-15 KTS WITH HIGHER GUSTS
TOMORROW AFTERNOON.

&&

.PREV DISC... /ISSUED 230 PM PDT SUN MAR 29 2015/

SHORT TERM...TONIGHT THROUGH WEDNESDAY. SOUTHWEST FLOW ALOFT
CONTINUES TONIGHT INTO MONDAY. MID AND HIGH LEVEL CLOUDS WILL BE
MOVING THROUGH AT TIMES WITH CLEAR TO PARTLY CLOUDY SKIES. LOW LEVEL
AIR MASS WILL BE A LITTLE WARMER TOMORROW SO HIGH TEMPS UP A FEW
DEGREES. EXPECT 60S TO LOWER 70S. AN UPPER LEVEL TROUGH AND COLD
FRONT WILL BE APPROACHING THE PACIFIC NORTHWEST DURING THE DAY. THIS
SYSTEM WILL MOVE THROUGH LATE MONDAY NIGHT AND TUESDAY. EXPECT A
PERIOD OF RAIN WITH THE FRONTAL PASSAGE THEN SCATTERED SHOWERS.
FAIRLY STRONG COLD ADVECTION SO MUCH COOLER WITH HIGHS DOWN ABOUT
10-15 DEGREES. WEST WINDS WILL BE INCREASING BECOMING BREEZY TO
WINDY DURING THE DAY. COLD UPPER LEVEL TROUGH OVER THE REGION
TUESDAY NIGHT AND WEDNESDAY WITH SCATTERED RAIN AND MOUNTAIN SNOW
SHOWERS.  94

LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY...AN UNSETTLED AND
PROGRESSIVE PATTERN WILL BE OVER THE PACIFIC NORTHWEST THROUGH THE
LONG TERM PERIOD. INITIALLY A TROUGH WILL BE OVER THE AREA AND A
WEAK DISTURBANCE WILL FALL APART AS IT MOVES THROUGH THE TROUGH.
THERE WILL BE A CHANCE OF MAINLY SNOW SHOWERS IN THE MOUNTAINS AND A
SLIGHT CHANCE OF RAIN SHOWERS IN THE LOWER ELEVATIONS WEDNESDAY
NIGHT FOLLOWED BY A CHANCE OF SNOW SHOWERS IN THE MOUNTAINS THURSDAY
WHILE THE LOWER ELEVATIONS ARE DRY. SNOW LEVELS WILL BE AT 2500-3500
FEET AT NIGHT AND 3500-4500 FEET DURING THE DAY. THIS PATTERN WILL
CONTINUE THROUGH NEXT WEEKEND. THURSDAY NIGHT AND FRIDAY WILL BE A
BREAK BETWEEN SYSTEM THOUGH THE WILL BE A SLIGHT CHANCE OF UPSLOPE
RAIN AND SNOW SHOWERS IN THE MOUNTAINS. FRIDAY NIGHT AND SATURDAY AN
UPPER LOW WILL CARVE A TROUGH JUST OFF THE COAST AND A MOIST
SOUTHWEST FLOW WILL BRING A CHANCE OF RAIN AND SNOW SHOWERS TO THE
MOUNTAINS AND A SLIGHT CHANCE OF RAIN SHOWERS TO THE LOWER
ELEVATIONS. BY SUNDAY THE GFS HAS THE TROUGH MOVING ASHORE WHILE THE
ECMWF HAS IT STILL OFFSHORE. HAVE BUMPED UP A FEW PERCENT FOR THE
ENTIRE AREA AND GAVE ALL THE AREA A CHANCE OF RAIN AND MOUNTAIN SNOW
SHOWERS IN CASE THE ECMWF IS RIGHT. HIGHS WILL BE NEAR NORMAL IN THE
MID 50S TO LOWER 60S IN THE LOWER ELEVATIONS AND IN THE MID 40S TO
MID 50S IN THE MOUNTAINS. LOWS WILL BE MAINLY IN THE 30S AND MAINLY
IN THE 20S IN THE MOUNTAINS. PERRY



&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  44  70  44  57 /   0   0  10  40
ALW  48  72  45  58 /   0   0  10  40
PSC  46  75  46  62 /   0   0  10  30
YKM  42  70  42  58 /   0   0  20  30
HRI  43  73  44  61 /   0   0  10  40
ELN  40  69  40  55 /  10   0  20  30
RDM  34  71  38  50 /   0   0  20  40
LGD  38  70  40  52 /   0   0  10  50
GCD  41  73  34  51 /   0   0  10  40
DLS  44  74  46  58 /   0   0  30  50

&&

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

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

$$

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