Weather Service Report


223 
FXUS66 KPDT 241736 AAA
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
935 AM PST Fri Feb 24 2017

Updated Aviation Discussion

.SHORT TERM...Low pressure system moving south along the coast
today. Models in fairly good agreement that most of the
precipitation will be over the Cascades and east slopes with
isolated showers possible over the northeast Oregon mountains.
Remainder of the area will have partly to mostly cloudy skies.
Temperatures in the 30s to lower 40s and light winds. Upper ridge
builds in overnight and Saturday with fair weather. The next
system moves across the region Sunday with a chance of snow. 94

&&

.AVIATION...18Z TAFs. VFR conditions will prevail for the next 
24 hours...with the exception of KDLS.  An easterly surface gradient 
tonight may allow stratus to develop and bring CIGS down to 
MVFR...as indicated on forecast soundings. Otherwise...variable 
clouds SCT-BKN at 5K-10K and higher clouds aloft can be expected. 
Winds will be less than 10 knots through the period.  Wister

&&

.PREV DISCUSSION... /issued 300 AM PST Fri Feb 24 2017/ 

SHORT TERM...Friday through Sunday afternoon...An upper trough 
digging south from coast of British Columbia will move south just 
offshore over the next couple of days and move into California 
Saturday. The track of trough will mean that dynamic lift associated 
with this system will miss the forecast area resulting in dry 
conditions through Saturday afternoon. Another upper trough moves 
south out of British Columbia Saturday night and spreads snow into 
the east slopes of the central Washington Cascades Saturday night. 
The snow will spread east and south across the interior Pacific 
Northwest during the day on Sunday due to very low snow levels. Polan

LONG TERM...Sunday night through Friday...The medium to long range 
models are still in good agreement that there will be an upper 
trough over the Pacific Northwest on Monday with the trough axis NE 
to SW right through the CWA. This will keep the atmosphere unstable 
and there will be rain and mountain snow showers as a result. Snow 
levels will be rather low due to low thickness values and much below 
freezing 850 temperatures. There could be some light snow even in 
the lower elevations...with some accumulating snows in the 
mountains...which may require winter weather highlights eventually. 
This trough pattern will gradually become a ridge pattern with the 
upper ridge developing along the coast into the Pacific Northwest by 
next Wednesday which will result in a drying and warming trend 
toward the end of the extended period (Wednesday through Friday). 
The models diverge from one another but they all indicate this 
transition from a trough to a ridge pattern. Winds will remain 
relatively light through the extended period with below normal 
temperatures through Tuesday...gradually becoming near and then 
slightly above normal by Friday of next week. 88


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  40  25  39  28 /  10  10  10  20 
ALW  40  26  40  29 /  10  10  10  20 
PSC  43  25  43  29 /  10  10  10  20 
YKM  38  22  41  26 /  10  10   0  30 
HRI  42  24  42  28 /   0  10  10  20 
ELN  35  16  36  23 /  10  10   0  40 
RDM  36  19  40  23 /  20  20  10  10 
LGD  34  19  36  24 /  10  10  20  20 
GCD  33  19  37  23 /  10  10  10  10 
DLS  40  25  42  31 /  20  10  10  30 

&&

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

$$

94

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Western Regional Climate Center, wrcc@dri.edu