Hermiston, Oregon Weather Forecast Discussion

894
FXUS66 KPDT 092101
AFDPDT
Area Forecast Discussion
National Weather Service Pendleton OR
201 PM PDT Tue Sep 9 2025
.DISCUSSION...Radar shows showers and thunderstorms developing
across the region. Upper low is creating enough instability with
abundant moisture to keep storms pulsing through the rest of the
afternoon. Will see the greatest chance (25-35%) of thunderstorms
near the Bend/Central OR region. Heavy rainfall, cloud-to-ground
lightning, and locally gusty winds from strong storms will be the
primary threat going through today and the next couple of days.
The pattern will continue through Thursday as the low continues
to push through the PacNW. Showers and thunderstorms embedded with
abundant lightning will continue to be the main story as the
weather disturbance progresses and brings cooler temperatures
along the process. High temps will taper down to seasonal normal
to around 5 degrees below normal, with some places in the area
only reaching the high 70s to low 80s for their highs. Training
storms along with slow motion storms across the region will cause
flooding concerns through mid week. Scar burned areas are mostly
of concern, but other areas with steep terrain and general flood
prone areas will need to monitor for potential hazards.
We`ll go through a more transitional weather phase going into the
weekend, as the area will be in-between two weather systems when
the current trough exits the region. Saturday will see us in a
bit of a dry break thanks to the transition with a temporary ridge
like pattern. This will be short lived before the next weather
system enters the area at the beginning of next week when the next
trough quickly makes its way in. Guidance has good confidence
(60-80% chance) that we will re-enter another wet pattern, but
confidence in clusters and NBM falls right after Sunday and how
it wants to handle the strength of the system throughout next
week. Regardless, expect another round of widespread precip
starting the new work week.
&&
AVIATION...18Z TAFs...Showers and storms are popping up across
the region. Not too confident about direct hits with airways, but
have put in VCSH for YKM/BDN/RDM. Have also entered PROB30 for the
airways across the Columbia Basin in the overnight hours. Winds
will be light except for areas near strong storms that could
produce erratic wind gusts.
&&
.PRELIMINARY POINT TEMPS/POPS...
PDT  57  81  58  77 /  40  30  70  70
ALW  61  82  62  77 /  40  20  60  70
PSC  57  85  59  79 /  30  20  40  50
YKM  58  86  58  84 /  30  30  20  20
HRI  57  84  60  79 /  40  20  50  60
ELN  53  84  56  81 /  20  30  10  20
RDM  47  74  49  72 /  50  70  60  50
LGD  52  79  53  74 /  30  40  80  80
GCD  49  75  52  69 /  40  70  80  80
DLS  60  81  62  76 /  30  40  30  30
&&
.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Flash Flood Watch from Wednesday morning through Thursday
     evening for ORZ503-505-506.
Flash Flood Watch through Wednesday evening for ORZ509-511.
WA...None.
&&
$$
SHORT TERM...95
LONG TERM....95
AVIATION...95

NWS PDT Office Area Forecast Discussion