Area Forecast Discussion
Issued by NWS Pendleton, OR
FXUS66 KPDT 301159 AAA
Area Forecast Discussion...Updated
National Weather Service Pendleton OR
459 AM PDT Thu Mar 30 2017
Updated aviation discussion
.SHORT TERM...Today through Friday night. A long wave trough will
move across the two state area with clouds and showers expected
today. The bulk of the pcpn should be over our eastern zones. As the
trough moves across the region this afternoon...breezy west winds
are expected from west to east. The additional rains could further
aggravate the already swollen rivers and streams. Snow levels will
remain above 4k feet and some minor accumulations could occur.
Drier conditions are forecast to move into the region tonight while
showers linger over the eastern mountains overnight. A dry ridge of
high pressure will dominate our entire areas weather into Friday.
Temperatures through the period will remain slightly below normal.
.LONG TERM...Saturday through Thursday...Saturday an upper ridge
over the area will be flattening as a system moves over the ridge
into our area. The morning will be dry and in the afternoon and
evening there will be a chance of rain showers along the Cascades
and eastern Oregon mountains while the rest of the area remains dry.
Showers will taper off to just a slight chance of rain overnight.
Snow levels will be over 7000 feet for this system. Sunday morning
will be dry but Sunday afternoon and night a trough will cross the
area with a chance of rain and snow showers in the mountains with
snow levels starting out at 5500 feet and dropping to 4000-4500
feet. There will also be a slight chance of showers in the Blue
Mountain Foothills and Central Oregon. Showers will taper off in the
eastern mountains Monday morning as a ridge builds over the area.
This will keep the area dry Monday afternoon through Tuesday
evening. Another system will be approaching Tuesday night and will
move the ridge off to the east. There will be a chance of showers
along the Cascade Crest late Tuesday night. Models have some timing
differences with the GFS bringing the system across the Cascades
Wednesday and the ECMWF Wednesday night. Both bring rain across the
area through Thursday. Have a chance of rain with snow levels over
6000 feet for the entire area Wednesday through Thursday.
Temperatures Saturday will be in the mid 50s to mid 60s then cool to
the upper 40s and 50s Sunday and Monday. Tuesday through Thursday
will warm to the 50s and lower 60s. Perry
.AVIATION...12Z TAFs...VFR conditions will be prevalent for the next
24 hours. Scattered to broken ceilings above 7000 feet will become
few to scattered this afternoon and tonight. An exception is KRDM
and KBDN which will have scattered to broken ceilings at 4000-7000
feet through this afternoon before clearing tonight to just some
high cirrus. KRDM and KBDN will have VCSH this morning and KPDT and
KALW will have VCSH this afternoon. Wind will be the major aviation
concern today as all TAF sites will see winds increase this morning
to 10-20 kts with gusts to 30 kts before decreasing after 02Z. An
exception is KDLS which will reach 20-30 kts with gusts to 35 kts
through 03Z before decreasing to below 12 kts by 05Z. Perry
.PRELIMINARY POINT TEMPS/POPS...
PDT 51 32 52 35 / 40 20 0 0
ALW 53 38 52 40 / 30 20 0 0
PSC 60 34 59 38 / 20 10 0 0
YKM 61 32 59 37 / 10 0 0 10
HRI 58 34 57 35 / 20 20 0 0
ELN 55 31 57 36 / 10 0 0 10
RDM 45 19 50 24 / 30 10 0 10
LGD 49 34 50 28 / 60 20 10 0
GCD 47 30 52 30 / 80 20 0 0
DLS 58 36 60 39 / 20 0 0 10