National Weather Service National Headquarters

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FXUS66 KPDT 031215 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
415 AM PST TUE MAR 3 2015

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH THURSDAY...A DEEP NORTHERLY FLOW BEHIND
A COLD FRONT WILL PREVAIL TODAY OVER THE PACIFIC NORTHWEST. THIS
WILL BRING DOWN COLD CANADIAN AIR INTO THE REGION. MODIFIED ARCTIC
AIR WILL BRUSH THE CWA WITH THE COLDEST AIR STAYING EAST OF THE
ROCKY MOUNTAINS. HOWEVER IN ANY CASE IT WILL BE A COOLER DAY WITH
MAXIMUM TEMPERATURE READINGS ONLY REACHING THE LOWER TO MID 40S IN
THE LOWER ELEVATIONS AND MID 20S TO MID 30S IN THE MOUNTAINS. THIS
IS SOME OF THE COLDEST AIR SEEN SINCE EARLY JANUARY. THE COLD SNAP
WILL BE SHORT LIVED HOWEVER AS AN UPPER RIDGE BUILDS EASTWARD INTO
THE REGION OVER THE NEXT FEW DAYS. TEMPERATURES WILL MODERATE EACH
DAY...BUT NIGHTS WILL BE COLD DUE TO STRONG RADIATIONAL COOLING AND
LIGHT WINDS. IN ANY EVENT A WARMING TREND WILL TAKE PLACE WITH
MAXIMUM READINGS REACHING THE MID 50S LOWER ELEVATIONS BY THURSDAY
WITH 40S TO NEAR 50 IN THE MOUNTAINS. PRECIPITATION IS NOT EXPECTED
IN THE SHORT TERM PERIOD...EXCEPT POSSIBLE LIGHT SNOW SHOWERS THIS
MORNING OVER THE WALLOWA MOUNTAINS. WINDS WILL BE MOSTLY PRESSURE
GRADIENT DRIVEN TODAY FROM THE NORTH AND THEN THEY WILL BECOME MORE
TERRAIN DEPENDENT STARTING WEDNESDAY AND CONTINUING ON THURSDAY.
WIND SPEEDS WILL MAINLY BE FROM 5 TO 10 KTS...BUT THERE COULD BE
LOCAL AFTERNOON GUSTS TO 15 KTS EACH DAY. 88

.LONG TERM...THURSDAY NIGHT THROUGH MONDAY NIGHT...A MID/UPPER LEVEL
RIDGE OF HIGH PRESSURE WILL PERSIST OVER THE NE PACIFIC AND THE
PACIFIC NORTHWEST THROUGH THE PERIOD FOR DRY CONDITIONS. AS SUCH
NEAR DROUGHT CONDITIONS ARE LOOKING MORE LIKELY AS THIS VERY
PERSISTENT RIDGE OF HIGH PRESSURE HAS BEEN A FEATURE OF THE
MID/UPPER LEVEL PRESSURE PATTERN DURING THIS WINTER SEASON ACROSS
THE NE PACIFIC AND THE REGION.  POLAN

&&

.AVIATION...12Z TAFS...VFR CONDITIONS ARE EXPECTED OVER THE NEXT 24
HOURS. THERE WILL BE SOME BKN-OVC CLOUDS AROUND 3000-4000 FT AGL
MAINLY IMPACTING KRDM AND KBDN THIS MORNING. THERE WILL ALSO BE SOME
SCT STRATUS CLOUDS AROUND 2000-2500 FT AGL AT KPDT AND KALW THIS
MORNING DUE TO OROGRAPHIC LIFT ALONG THE NORTH FACING SLOPES OF THE
FOOTHILLS OF THE BLUE MOUNTAINS. OTHERWISE, SKIES ARE EXPECTED TO
CLEAR BY AROUND MIDDAY AT ALL TAF SITES. WINDS WILL BE LESS THAN 10
KTS AND WILL BE PRESSURE GRADIENT DRIVEN TODAY. THEN PRESSURE
GRADIENTS WEAKEN AROUND DUSK ALLOWING FOR DRAINAGE WINDS OF AROUND
5-8 KTS TO OCCUR THROUGH OVERNIGHT.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  40  22  48  26 /   0   0   0   0
ALW  39  27  51  31 /   0   0   0   0
PSC  46  18  50  27 /   0   0   0   0
YKM  44  21  49  27 /   0   0   0   0
HRI  45  18  51  25 /   0   0   0   0
ELN  46  19  49  26 /   0   0   0   0
RDM  43  12  50  23 /   0   0   0   0
LGD  38  13  45  24 /  10   0   0   0
GCD  39  15  48  24 /  10   0   0   0
DLS  50  24  55  31 /   0   0   0   0

&&

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

&&

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

$$

88/99/99