weather.gov     
National Weather Service

Area Forecast Discussion
NWS Homepage
This page is being discontinued on March 12, 2014.
The same data is available at this site. Please update your bookmarks.
Thank you, and we apologize for the inconvenience.
Please send an email to SR-SRH.Webmaster@noaa.gov with any concerns.


Current Version
Previous Version:    01  02  03  04  05  06  07  08  09  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  
[Printable]
955
FXUS66 KPDT 171745 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
1045 AM PDT THU APR 17 2014

UPDATED FOR AVIATION DISCUSSION

.SHORT TERM...UPDATE...THE NEXT PACIFIC SYSTEM CONTINUES TO MOVE
INTO BRITISH COLUMBIA AND THE PACIFIC NORTHWEST THIS MORNING. THIS
SYSTEM WILL MOVE THROUGH THE REGION TODAY AND TONIGHT. A BAND OF
LIGHT PRECIP HAS DEVELOPED OVER THE COLUMBIA BASIN, COLUMBIA RIVER
GORGE AND YAKIMA VALLEY. STILL EXPECT THE COLD FRONT, NOW MOVING
ONSHORE, TO SWING ACROSS THE INTERIOR NORTHWEST FROM AROUND NOON
INTO THE EARLY EVENING. THIS FRONT WILL GIVE MOST AREAS A DECENT
CHANCE OF PRECIP. SNOW LEVELS WILL BE HIGH TODAY, GENERALLY BETWEEN
6500 AND 7500 FEET, THOUGH THEY SHOULD RUN AROUND 5000 FEET ALONG
THE CENTRAL WASHINGTON CASCADE CREST. OVERALL MEASURABLE SNOW TODAY
WILL BE ONLY AT THE HIGHEST ELEVATIONS. WINDS WILL GRADUALLY
INCREASE THIS AFTERNOON AND EVENING AFTER THE COLD FRONT HAS MOVED
THROUGH. WEST FLOW BEHIND THE FRONT THIS EVENING WILL KEEP PRECIP
CHANCES HIGH ALONG AND NEAR THE CASCADE CREST AND THE INTERIOR
MOUNTAINS. OTHER UPDATES INCLUDED ADJUSTMENTS TO PRECIP CHANCES AND
QPF FOR TODAY AND THIS EVENING. 90

.LONG TERM...PREVIOUS DISCUSSION...THE UPPER LEVEL RIDGE WILL MOVE
THROUGH EASTERN WASHINGTON AND OREGON SATURDAY MORNING. SOUTHWEST
FLOW WILL SET UP BEHIND THE RIDGE. LOW LEVELS WILL REMAIN DRY UNTIL
A NEW MOISTURE SOURCE ARRIVES DUE TO PREVIOUS SUBSIDENCE FROM THE
RIDGE...SO PRECIPITATION CHANCES ARE LOW THROUGH SUNDAY NIGHT...
EXCEPT ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES. BY MONDAY A
LOW PRESSURE SYSTEM OFF THE COAST WILL SPIN UP MOISTURE WITH THE
SOUTHWEST FLOW...INCREASING POPS ALONG THE NORTHEAST MOUNTAINS...AND
BRINGING A SLIGHT CHANCE ACROSS THE LOWER ELEVATIONS. BY MONDAY
EVENING SHOWERS WILL BECOME LIKELY ALONG THE NORTHEAST MOUNTAINS. AS
THE LOW MOVES OVER THE FORECAST AREA ON TUESDAY THERE WILL STILL BE
A CHANCE FOR SHOWERS...BUT EXPECT TEMPERATURES TO COOL OFF WITH THE
COLD FRONTAL PASSAGE. OVERALL TEMPERATURES IN THE EXTENDED WILL
START OUT IN THE UPPER 60S TO LOWER 70S ACROSS THE LOWER
ELEVATIONS...WITH 50S TO LOWER 60S MOUNTAINS. THESE TEMPERATURES
WILL INCREASE A DEGREE OR TWO EACH DAY...UNTIL THE COLD FRONT PUSHES
THROUGH ON TUESDAY. THEN THE TEMPERATURES ACROSS THE LOWER
ELEVATIONS WILL BE BACK IN THE LOWER TO MID 60S...WITH UPPER 40S TO
UPPER 50S MOUNTAINS.

&&

.AVIATION...18Z TAFS...AREAS OF MVFR WILL CONTINUE TODAY AS A STORM
SYSTEM MOVES ACROSS EASTERN WASHINGTON AND OREGON. LOCAL IFR
CONDITIONS POSSIBLE AS WELL. WINDS WILL BB 5 TO 15 KTS GUSTING
AROUND 20 KTS THROUGH 22Z.  AFTER THAT SFC WIND GUSTS WILL RANGE 20
TO 30 KTS.  THESE WINDS WILL STAY BREEZY FOR THE REST OF THE TAF
PERIOD.  KBDN AND KRDM SHOULD ONLY GUST AROUND 20 KTS.  CLOUDS
SHOULD START BREAKING UP AT KYKM AFTER 22Z AND SPREAD EAST. BY 06Z
ALL AREAS SHOULD BE VF.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  58  41  60  35 /  70  80  10   0
ALW  58  44  61  38 /  80  80  10   0
PSC  59  43  65  35 /  70  60  10   0
YKM  57  36  63  34 /  60  20  10   0
HRI  59  41  64  33 /  70  60  10   0
ELN  55  38  60  33 /  70  30  10   0
RDM  57  27  61  27 /  80  30  10   0
LGD  58  39  57  33 /  70  80  20   0
GCD  59  35  58  30 /  70  70  10   0
DLS  58  43  64  37 /  70  30  10   0

&&

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

THREAT INDEX
TODAY : GREEN
FRIDAY : GREEN
SATURDAY : 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

$$

90/76/89







U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE