Area Forecast Discussion
Issued by NWS Pendleton, OR

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841
FXUS66 KPDT 191000
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
259 AM PDT Thu Apr 19 2018

.SHORT TERM...Today through Saturday...An upper low is moving
ashore in central California at this time and an associated trough
remains over the pacific northwest. The low will move into southern
Nevada this afternoon and this will drag the trough eastward and out
of our area by this evening. Rain and snow showers are winding down
but there will still be isolated to scattered showers in central
Oregon and the Ochoco-John Day Highlands this morning tapering off
to just a few isolated lingering showers in the afternoon.
Precipitation will just be a few hundredths of an inch. Snow levels
will be around 4000 to 4500 feet this morning then rise to 5000 to
5500 feet in the afternoon. This evening a ridge will build over the
area and this should give us fair and dry weather Thursday night and
Friday. By Friday night, another system will be moving towards the
coast and there will be a chance of rain and snow showers mainly
along the Washington Cascades perhaps reaching Ellensburg by
sunrise. The system will be passing mainly to the north and showers
on Saturday will stay mainly in the Cascades. Precipitation amounts
will be light away from the Washington Cascade crest.  The main
impact will be breezy to windy conditions of 15 to 25 mph in the
Kittitas Valley and Columbia Basin saturday afternoon. Temperatures
today will be in the mid to upper 60s with 50s and lower 60s in the
mountains. Friday will be a couple of degrees warmer. Saturday will
cool to the lower to mid 60s with 50s in the mountains. Perry

.LONG TERM...Saturday night through Thursday...An upper trough will
be exiting the region to the east with just some lingering showers
over the central Washington Cascades. Otherwise dry weather will
prevail over the CWA until around Monday night. The long range
models are in pretty good agreement with this scenario. Temperatures
during this period will be near to above normal...mid 60s to lower
70s. An upper trough will then move into the region late Monday
night into Tuesday bring possible light precipitation to mainly the
southern areas and the mountains. Models are in good agreement with
this trough as well as the preceding dry period. The atmosphere will
be moisture limited though, so precipitation will be very light and
spotty. A ridge of high pressure will return by Wednesday and
continue into Thursday for dry conditions again with slightly above
normal temperatures in the upper 60s to lower 70s in the lower
elevations. Winds will be gusty at times, first behind the exiting
trough Saturday night and then again on Monday night through Tuesday
with that trough that moves through the region. 88

&&

.AVIATION...12Z TAFs...There will be a few showers in central
Oregon, otherwise VFR conditions will prevail through the next 24
hours. CIGs will generally be from 025-050 in central Oregon this
morning, and 050-100 elsewhere. Conditions will improve as the day
progresses. Winds will become locally breezy in central Oregon this
afternoon and early evening...otherwise they will be light. 88

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  62  39  66  44 /  10   0   0  10
ALW  65  41  68  46 /   0   0   0  10
PSC  68  41  70  47 /   0   0   0  10
YKM  66  41  68  43 /   0   0   0  10
HRI  67  40  70  46 /   0   0   0  10
ELN  62  39  64  40 /   0   0  10  20
RDM  58  32  66  36 /  20   0   0  10
LGD  60  38  63  43 /  10   0   0  10
GCD  57  35  64  40 /  30   0   0  10
DLS  66  45  68  46 /  10   0   0  20

&&

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

$$

83/88/88



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