Union Gap, Washington Weather Forecast Discussion

451
FXUS66 KPDT 102311
AFDPDT
Area Forecast Discussion
National Weather Service Pendleton OR
411 PM PDT Wed Sep 10 2025
Updated Aviation Discussion
.AVIATION...00z TAFs...Sites in Washington are generally expected
to be VFR through the period, however our Oregon sites, namely BDN
and RDM, are expected to receive yet another round of showers,
namely during the evening and overnight period heading into
Thursday, although another round could fire off during the day
Thursday as well. Thunderstorms are not anticipated for the two
sites as of now. Lesser chances exist for PDT and ALW as well
during the overnight period into Thursday, however weather models
are starting to push the bulk of rainfall to the south and east
of PDT/ALW over the period. Otherwise, expected gusty winds at DLS
with light winds elsewhere, and sct-bkn mid-level cigs across
Washington sites, while Oregon sites are generally bkn-ovc 5-10
kft. Evans/74
&&
.PREV DISCUSSION... /issued 148 PM PDT Wed Sep 10 2025/
DISCUSSION...Areas of showers and thunderstorms expected to
develop later in the afternoon. Current coverage shows a couple
of isolated showers moving across the mountainous areas with some
pockets of thunder embedded. Main threats today will be locally
heavy rain, gusty winds, and small hail from the strongest storms. Flash
Flood watches (mainly for scar burns) are in effect through the
next day. WPC issued MRGL (at least 5%) for excessive rainfall
through Friday morning in parts of the Southern Blues. Areas
across that region is expected to receive anywhere from a half
inch to an inch and half (65-85% chance). This will cause some
concerns for debris flow floods going through the next day. Parts
of the South- Central Washington will be on the much drier side,
receiving up to a tenth of an inch (50-70% chance) going through
the next day. Temps will stay cooler going through the week,
continuing the relief from the heat we saw last week.
As the trough moves on from the area, rain coverage will decrease
heading closer to the weekend. Friday will be much drier, with
showers and thunderstorms concentrated towards the East Mountains
and Wallowa`s (65-75% chance). We`ll get a break from the
convection on Saturday as the trough moves out and a short-stayed
ridge moves over the PacNW. This break will prove to be short
lived as another low follows shortly behind it. Another wave will
push into the region Sunday, but does not appear to be as robust
as the system from what we`ll see today and tomorrow. Clusters are
agreement that we`ll re-enter another wet pattern during the
beginning of next week, but to what extent remains to be
undetermined since confidence in guidance plummets after Sunday.
Regardless, temperatures will remain near to just below normal for
the next several days and we`ll have to pay attention how next
week unfolds.
&&
.PRELIMINARY POINT TEMPS/POPS...
PDT  58  79  56  80 /  60  60  20  20
ALW  62  81  60  81 /  60  50  30  30
PSC  59  85  57  84 /  30  30  10  10
YKM  58  87  56  85 /  10  20  10  10
HRI  60  83  58  83 /  40  40  10  10
ELN  56  85  54  83 /  10  10  10  10
RDM  48  73  46  78 /  60  50  20   0
LGD  52  75  52  78 /  70  70  40  50
GCD  52  72  50  77 /  80  70  40  30
DLS  61  79  59  80 /  20  20  10   0
&&
.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Flash Flood Watch through Thursday evening for ORZ503-505-506.
Flash Flood Watch until 11 PM PDT this evening for ORZ509-511.
WA...None.
&&
$$
SHORT TERM...95
LONG TERM....95
AVIATION...74

NWS PDT Office Area Forecast Discussion