Red Flag Warning 1, NWS Pendleton, OR

575 
WWUS86 KPDT 302137
RFWPDT

URGENT - FIRE WEATHER MESSAGE
National Weather Service Pendleton OR
237 PM PDT Tue May 30 2017

...SCATTERED THUNDERSTORMS PRODUCING FREQUENT LIGHTNING ACROSS
CENTRAL OREGON AND THE LOWER COLUMBIA BASIN THIS AFTERNOON AND 
EVENING...

.Scattered thunderstorms have developed in central and northeast
Oregon and will soon develop in south central and southeast
Washington this evening. Some of the thunderstorms will bring 
frequent cloud-to-ground lightning and gusty outflow winds. If new
fire starts begin in the dry grassy fuels, the gusty winds may 
contribute to rapid fire spread.


ORZ640-310600-
/O.CON.KPDT.FW.W.0001.000000T0000Z-170531T0600Z/
Central Mountains of Oregon-
237 PM PDT Tue May 30 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS
EVENING FOR THUNDERSTORMS PRODUCING ABUNDANT LIGHTNING AND GUSTY
WINDS...

* AFFECTED AREA...In Oregon...Fire weather zone 640 covering the 
  Crooked River National Grasslands and the Prineville District. 

* TIMING...Scattered thunderstorms have already developed in the
  warning area and will continue through the evening hours. West
  to northwest winds will be around 10 to 20 mph this evening.

* LIGHTNING ACTIVITY...4 meaning scattered thunderstorms with
  frequent lightning and light to moderate rain.

* PRECIPITATION...Most storms will produce rainfall amounts 
  less than a tenth of an inch. A few storms may produce up to 
  one quarter of an inch of rain.

* IMPACTS...Any fires that develop in the grasslands will 
  likely spread rapidly. There will be breezy winds in addition 
  to thunderstorms. Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

ORZ641-WAZ641-675-310630-
/O.CON.KPDT.FW.W.0001.170530T2300Z-170531T1100Z/
Lower Columbia Basin of Oregon-Lower Columbia Basin of Washington-
Eastern Washington Southern Columbia Basin-
237 PM PDT Tue May 30 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 AM PDT WEDNESDAY
FOR THUNDERSTORMS PRODUCING ABUNDANT LIGHTNING AND GUSTY WINDS...

* AFFECTED AREA...In Washington and Oregon...Fire Zone 641 
  covering the Lower Columbia Basin and the Blue Mountain 
  Foothills. In Washington... Fire weather zone 675 covering the 
  Hanford Fire District and the lower Yakima Valley. 

* TIMING...Scattered thunderstorms will develop late this
  afternoon and continue through the evening across the Lower
  Columbia Basin of Oregon and Washington. Scattered thunderstorms
  will taper off to isolated showers and thunderstorms after
  midnight. West winds will be around 10 to 20 mph with local
  gusts to 30 mph.

* LIGHTNING ACTIVITY...4 meaning scattered thunderstorms with 
  frequent lightning and light to moderate rain.

* PRECIPITATION...Most storms will produce rainfall amounts 
  less than a tenth of an inch. A few storms may produce up to 
  one quarter of an inch of rain.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  There will be breezy winds in addition to thunderstorms. 
  Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

046 
WWUS86 KPDT 310319
RFWPDT

URGENT - FIRE WEATHER MESSAGE
National Weather Service Pendleton OR
819 PM PDT Tue May 30 2017

ORZ641-WAZ641-675-310430-
/O.CAN.KPDT.FW.W.0001.000000T0000Z-170531T1100Z/
Lower Columbia Basin of Oregon-Lower Columbia Basin of Washington-
Eastern Washington Southern Columbia Basin-
819 PM PDT Tue May 30 2017

...RED FLAG WARNING IS CANCELLED FOR ABUNDANT LIGHTNING AND GUSTY
WINDS FOR FIRE WEATHER ZONES 641, 641, AND 675...

The National Weather Service in Pendleton has cancelled the Red
Flag Warning. 

Thunderstorms have ended and winds will be decreasing overnight. 

$$

ORZ640-310430-
/O.CAN.KPDT.FW.W.0001.000000T0000Z-170531T0600Z/
Central Mountains of Oregon-
819 PM PDT Tue May 30 2017

...RED FLAG WARNING IS CANCELLED FOR ABUNDANT LIGHTNING AND GUSTY
WINDS FOR FIRE WEATHER ZONE 640...

The National Weather Service in Pendleton has cancelled the Red
Flag Warning. 

Thunderstorms have ended and winds will be decreasing overnight. 

$$

Area Forecast Discussion
National Weather Service Pendleton OR
222 AM PDT Tue May 30 2017

.SHORT TERM...Today through Thursday Night...Upper level ridging
continues to push to the east of the region early this morning.
An initial weak shortwave that crossed Central Oregon to the
Columbia Basin last evening continues to weaken as it exits to the
north/northeast. A trough offshore the WA/OR coast will move
onshore this afternoon, with a marine push entering areas east of
the Cascade crest early this afternoon, and a surface cold front
sweeping across the area this evening into the overnight. Winds
will increase this afternoon as surface pressure gradients
tighten, with breezy/windy conditions felt first in the Columbia
Gorge this afternoon, spreading east into the Kittitas/Yakima
Valleys and the Columbia Basin this evening. Forecast pressure
gradient magnitudes point to winds remaining under advisory
levels, with 20-30 mph winds gusting to 40 mph at times late this
afternoon and evening before decreasing overnight. The approaching
front and a mid level shortwave will provide enough forcing with
increasing mid level moisture to generate showers and
thunderstorms this afternoon/evening. Initial isolated activity
will likely develop early this afternoon, increasing to scattered
for late this afternoon and evening. Rainfall looks to be rather
limited, with most areas receiving less than one tenth inch of
rainfall. With deep layer shear of 45-55 knots some of the storms
will be capable of producing gusty winds. High temperatures today
will range from the lower/mid 90s across the Columbia Basin, with
cooler 80s further west due to the earlier marine push. Expect
mainly upper 70s/lower 80s for the eastern mountains. Lows tonight
will range from the 50s lowlands to the 40s mountains.

Upper level troughing will persist across the interior Pacific
Northwest Wednesday through Thursday Night. Cooler highs in the
mid 70s to around 80 can be expected for the lower elevations,
with mainly 60s for the mountains. Chances of showers will
persist across the eastern mountains, with slight chances of
afternoon thunderstorms. The lower elevations will remain
mainly dry.

.LONG TERM...Friday through Tuesday...A broad upper trough will
move through the region on Friday and then it will be replaced by
a broad upper ridge Friday night and early Saturday. This will
bring a break in any showery conditions with dry and stable air.
Then another trough will move into the Pacific Northwest Saturday
night and on Sunday. This will combine with some increase in
moisture and instability to cause some isolated to scattered
showers with a slight chance of an afternoon thunderstorm Saturday
afternoon through Tuesday. Showers and thunderstorms will be
mostly over the eastern mountains...central oregon highlands and
along the Cascade east slopes. Elsewhere it will remain dry.
Temperatures will be near normal temperatures through the period
with no significant cold or hot spells. The medium to long range
models are in fair agreement at the start of the extended period
but then they diverge from each other some after Saturday. However
all are still showing some kind of upper trough/low which will
keep the unsettled weather in place Saturday afternoon through
Tuesday. Winds will be mostly light...except for the period Sunday
afternoon through Sunday night as the upper trough/low moves into
the region. The winds will become moistly light again by Monday
and will remain light through Tuesday.

&&

.AVIATION...12Z TAFs...A strong cold front will move across the area
today and move off to the east tonight. This frontal system will
bring a chance of showers and a slight chance of thunderstorms at
all TAF sites this afternoon and/or evening. Some storms could cause
MVFR conditions for brief periods due to heavy rain, hail or blowing
dust due to gusty winds. The winds will become mainly westerly
behind the front by this afternoon and this evening. They will
increase in speed to at least 15 to 25 kts at KDLS and KPDT.
Elsewhere winds will also become west to northwest but will remain
below 15-20 kts.

&&

.FIRE WEATHER...Will continue the Fire Weather Watch for
Central Oregon northward to the Columbia Basin for this afternoon
and evening for scattered thunderstorms capable of producing
abundant lightning. In addition, most of the storms will produce
limited rainfall increasing the threat. Will allow the day shift
to make the final call on any warnings that may be needed. Gusty
winds are also expected in this area late this afternoon and
evening which could contribute to escaped fires that may develop.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  89  57  74  53 /  10  40  10  20
ALW  95  60  77  56 /  10  30  20  20
PSC  94  58  79  55 /  10  30  10  10
YKM  92  57  81  54 /  10  40  10  10
HRI  92  58  78  55 /  10  40  10  10
ELN  89  54  75  51 /  10  40  10  10
RDM  80  46  74  46 /  30  20  20  10
LGD  88  57  74  50 /  10  20  30  40
GCD  90  56  75  50 /  10  30  30  40
DLS  78  57  79  56 /  20  20  10  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Fire Weather Watch from noon PDT today through this evening for
     ORZ640-641.

WA...Fire Weather Watch from noon PDT today through this evening for
     WAZ641-675.

&&

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