High Wind Warning 3, NWS Pendleton, OR

255 
WWUS76 KPDT 210149
NPWPDT

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
549 PM PST Mon Feb 20 2017

ORZ507-508-210300-
/O.CAN.KPDT.HW.W.0003.000000T0000Z-170221T0600Z/
Foothills of the Northern Blue Mountains of Oregon-
Foothills of the Southern Blue Mountains of Oregon-
549 PM PST Mon Feb 20 2017

...HIGH WIND WARNING IS CANCELLED...

The National Weather Service in Pendleton has cancelled the High
Wind Warning.

The winds across the Blue Mountain Foothills of Oregon have
decreased considerably over the past couple of hours. Winds the
rest of the evening are expected to run 5 to 15 mph from the
southeast through the southwest. Thus the High Wind warning has
been cancelled.

$$

ORZ505-506-511-WAZ029-210300-
/O.CAN.KPDT.WI.Y.0009.000000T0000Z-170221T0600Z/
John Day Basin-Ochoco-John Day Highlands-Central Oregon-
Foothills of the Blue Mountains of Washington-
549 PM PST Mon Feb 20 2017

...WIND ADVISORY IS CANCELLED...

The National Weather Service in Pendleton has cancelled the Wind
Advisory.

The winds across the Blue Mountain Foothills of Washington, and 
the Ochoco-John Day Highlands and the John Day Basin in Oregon 
have decreased considerably over the past couple of hours. Winds 
the rest of the evening are expected to run 5 to 15 mph. Thus the
wind advisories in these areas have been cancelled.

$$

Area Forecast Discussion...Corrected
National Weather Service Pendleton OR
1115 AM PST Mon Feb 20 2017

Corrected AVIATION Discussion

.UPDATE...Significant dry slot had worked its way into the region
creating windy conditions across portions of the area that has
prompted a Wind Advisory. In addition pops were substantially
decreased and afternoon temps increased along with winds.

&&

.AVIATION...18Z TAFS...VFR through this evening and into overnight.
Another warm front will move into central Oregon after 09Z tonight
with a snow/rain mix at KRDM and KBDN and rain spreading northward
to remaining TAF sites overnight. MVFR conditions will begin at KRDM
and KBDN with the onset of the rain/snow mix. Clearing skies due to
sinking air immediately east of the Cascades this morning has
allowed mixing of stronger winds aloft down to the surface at KRDM,
KBDN, KS33, KS39 and KGCD. Aircraft at these airports will
experience Severe Turbulence during takeoffs and landings due
sustained southerly winds of 30 kts with gusts of 40-45 kts. KPDT
and KALW will have southwest winds of 15 to 25 kts with gusts to 30-
35 kts. Winds will diminish after 03Z. Winds at KYKM and KDLS will
remain below 15 kts for the next 24 hours. Polan

.PREVIOUS DISCUSSION... /issued 825 AM PST Mon Feb 20 2017/

UPDATE...A low pressure system over the ne pac will continue to
spin disturbances into the pac nw today with clouds and rain
expected. The latest radar shows a batch of rain approaching our
wa/or cascades with drier conditions across portions of the region
except for the eastern zones. A wedge of drier air may allow for
some sunshine that could make the atmosphere unstable and an isold
tsra is possible over our far eastern zones around and near wallowa
area this afternoon. Some changes were performed on the pops this
morning to lower them a bit while they were increased some this
afternoon over our extreme northern sections. In addition some of
the showers may produce heavy rainfall and along with the warmer
temps will continue to produce quick snow melt that could fill
stream and rivers will rapidly moving water and a flood watch
remains in effect for some locations.

PREV DISCUSSION... /issued 401 AM PST Mon Feb 20 2017/

SHORT TERM...Today through Wednesday...An active weather pattern
will persist through at least mid week with one Pacific storm after
another. One moving through now is bring moderate rain to the Blue
Mountains and Foothills with rain also covering most other areas of
the CWA. Snow levels are fairly high so snow does not look to be a
problem. Once this system moves off to the east later this morning
expect showers this afternoon. There may even be a stray lightning
strike over the extreme northeast corner of the CWA but not enough
to include in the forecast. Winds will also increase this afternoon
and it will become breezy to windy...mostly on the ridge tops that
are exposed to the free air winds. Another weather system will then
move into the region on Tuesday...with a brief break and then a
third system on Wednesday. Tuesday will be stronger and wetter
though. Snow levels will lower by Wednesday but the amount of
precipitation will not be that much on Wednesday and so snow amounts
in the mountain will be too light for any winter weather highlights.
There are some hydrology concerns with the rain and melting snow
over the next couple of days...mainly in the Yakima and Kittitas
Valleys and the Simcoe Highlands due to rain and snow melt. There is
a flood watch in effect for these areas which is discussed in more
detail below. Temperatures will be slightly above normal today and
then will lower to near or slightly below normal by Wednesday. It
will become breezy again on Tuesday. 88

LONG TERM...Wednesday Night through Monday...Unsettled weather is
expected through the long term period as a trough will be over the
western CONUS and Canada. Wednesday night and Thursday a wave will
be moving south through the trough. This will give the mountains a
chance of mainly snow as snow levels will start out at 1500 feet and
drop to the surface by Thursday afternoon. Snow levels will remain
below 1500 feet through Monday. The lower elevations won't see much
precipitation though there should be a slight chance of rain and
snow showers on Thursday. Precipitation amounts will be light and
even in the mountains snow amounts will be an inch or less. After a
lull Thursday night, another wave will graze the coast Friday and
Friday night. This will give the mountains another chance of snow
while in the lower elevations there will be a slight chance of snow
mixed with rain during the daytime. The Columbia Basin will
generally remain dry. The wave will slide south into California on
Saturday while another wave starts to move south out of the Gulf of
Alaska. Some weak ridging will keep much of the area dry Saturday
and Saturday night though the northerly flow will generate a slight
chance of light snow showers in the mountains. That next wave will
arrive either Sunday or Sunday night (models have timing
differences) and affect the region through Monday. Due to the
uncertainty, have a chance of snow showers in the mountains and a
slight chance of snow showers mixed with daytime rain showers in the
lower elevations. Temperatures will be in the 30s to around 40
during the day and generally in the mid teens to mid 20s at night.
Perry

HYDROLOGY...Previous Discussion...Significant rain will fall Monday
and Tuesday with these warm fronts. Rising snow levels from the warm
air aloft will add snowmelt to the runoff. Rainfall up to three
quarters of an inch in the Simcoe Highlands and up to one half an
inch in the Yakima and Kittitas Valleys may create localized
flooding. A flood watch has been issued for these areas Monday
through Tuesday afternoon. Lesser amounts of rain will fall in the
Lower Columbia Basin and Foothills of the Blue Mountains. A
Hydrological Outlook - product PDXESFPDT - has been issued for these
areas. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  58  34  42  31 /  50  60  50  20
ALW  61  36  42  32 /  60  50  70  30
PSC  56  33  42  30 /  60  40  70  10
YKM  46  28  38  26 /  80  40  60  10
HRI  59  32  42  29 /  50  50  50  10
ELN  41  27  35  25 / 100  30  60  10
RDM  56  29  40  26 /  50  50  30  20
LGD  52  36  40  29 /  90  60  50  30
GCD  58  34  42  29 /  60  50  50  40
DLS  46  31  38  32 /  90  50  40  20

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Wind Advisory until 10 PM PST this evening for ORZ505-506-511.

WA...Flood Watch through Tuesday afternoon for WAZ026-027-521.

&&

97/99/88/83