017 
FXUS66 KPDT 020233
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
733 PM PDT Wed May 1 2019

.SHORT TERM...Upper level trough remains over the Pacific
northwest. Cumulus is dissipating a little slower this evening as
compared to the past few. Northwest flow aloft is providing 
better upslope flow into northeast Oregon mountains. Overall 
expect clearing skies late evening into the overnight period. 
Satellite and models indicate mid and high level clouds moving 
south through BC will cross the region late tonight into Thursday.
This cloud cover combined with the fact temperatures and dew 
points are up 2-7 degrees from this time yesterday should result 
in a warmer night. Lows mainly in the upper 20s and 30s. Heights
are building the next few days and will provide a gradual warming
trend. 94

&&

.PREV DISCUSSION... /issued 525 PM PDT Wed May 1 2019/ 

SHORT TERM...Tonight through Saturday night: Broad northwest 
flow aloft on the backside of a departing low will continue to 
deliver a dry weather pattern into the weekend. There are a pair 
of midlevel shortwaves swinging through; one coming through this 
afternoon and a second on Thursday. The main impacts from these 
waves will be a tightening pressure gradient and continuation of 
breezy conditions. Wind gusts of 20-25 mph will be common with 
locally stronger speeds channeling through the Columbia Gorge and 
Kittitas Valley. The air mass will slowly moderate resulting in a 
subtle warming trend and afternoon highs in the 50s and 60s on 
Thursday toward the 70s by Saturday. /sb

LONG TERM...Sunday through Wednesday: The large scale weather 
pattern doesn't change very much for the start of the new week 
with northwest flow persisting between high pressure over the Gulf
of Alaska and low pressure over the Canadian Plains. Models are 
in decent agreement of a few more shortwaves dropping in from the 
northwest but differ slightly on the exact timing and strength. 
The first wave arriving late Sunday will usher a weak cold front 
through increasing west to northwest winds. If timing 
holds...Sunday should be the warmest day of the week with 
afternoon highs in the 70s to lower 80s ahead of the frontal 
passage. Limited moisture accompanying the front will result in 
increasing clouds but little in the way of precipitation. A second
wave arrives Monday into Tuesday and will take a more north to 
south trajectory as the high pressure ridge from the Gulf of 
Alaska flops into British Columbia. This system will slow down and
tap into a deeper pool of moisture coming across the Northern 
Rockies bringing a better chance for showers across Eastern 
Oregon. Instability may deep enough to warrant a few afternoon 
thunderstorms but confidence was too low to include in the 
forecast at this time. Temperatures will cool into the start of 
the week but generally remain above seasonal normals, topping out 
in the 60s and 70s. /sb

AVIATION...00z tafs. Cumulus will diminish at sunset with sct
060-100 becoming skc. Winds 10-25kt becoming 5-10kt overnight. 

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  65  35  69 /   0   0   0   0 
ALW  39  66  39  70 /   0   0   0   0 
PSC  40  71  38  74 /   0   0   0   0 
YKM  35  69  36  72 /   0   0   0   0 
HRI  39  70  38  74 /   0   0   0   0 
ELN  35  63  36  68 /   0   0   0   0 
RDM  27  64  29  70 /   0   0   0   0 
LGD  31  61  31  67 /  10   0   0   0 
GCD  30  61  31  69 /  10   0   0   0 
DLS  38  68  37  73 /   0   0   0   0 

&&

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

$$

94