Area Forecast Discussion
Issued by NWS Spokane, WA

Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS66 KOTX 301134
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
434 AM PDT SAT APR 30 2016

.SYNOPSIS...
Showers will linger over the region today with isolated
thunderstorms possible mainly over the Idaho Panhandle for the
afternoon. High pressure will build in Sunday resulting in a
warming trend heading into next week. Temperatures will climb to
above normal once again early next week...with highs mainly in the
mid 70s to lower 80s. High pressure will move east for the middle
of next week allowing increased moisture to move in from the
south...resulting in a chance for showers and thunderstorms.

&&

.DISCUSSION...
Today through Sunday...The broad upper level trough will be
replaced by a building ridge of high pressure over the weekend. A
north-south oriented band of precipitation located along the
WA/ID border this morning will start to weaken today. This band
is a result of a deformation zone between the northwest flow
along the eastern edge of the eastern Pacific ridge and northeast
flow around the small scale upper low that continues to linger
over western MT and the central panhandle of Idaho. This feature
will eventually minor out as the bulk of the shortwave energy
dives south into California. Showers will continue to affect
extreme eastern WA and north ID but will become more scattered in
nature this afternoon. If we get enough sun breaks this afternoon
we could see isolated thunderstorms develop but confidence is
fair at best. Daytime temperatures will be several degrees warmer
that Friday`s readings with the warmer temperatures across the
western zones where sunshine will be prevalent. High pressure
will build on Sunday with dry conditions and warmer temperatures
that will help the Lilacs Bloom. /Kelch

Sunday night through Tuesday...A placid upper level high pressure
...the northern component of a weak rex block...will exist over the
forecast area Sunday night and Monday with quiet and mild
conditions expected. On Tuesday this high will shift eastward
allowing the next upstream Pacific trough to begin influencing the
region with southerly flow aloft and the beginnings of a surge of
Pacific moisture into the region. Tuesday will be the warmest day
of the week with upper 70s common in most valley locations with
some mid 80s readings in the deep basin. The increase in moisture
in this warm and increasingly unstable air mass will also bring
the beginnings of a thunderstorm threat...mainly over the Cascades
but possibly over the northern mountains near the Canadian Border
and the Camas Prairie/Blue Mountains Tuesday afternoon and
evening.

Wednesday through Friday...Wednesday appears to be an active day
for hit-and-miss showers and thunderstorms around the region as a
slow moving Pacific cold front approaches the forecast area with
the densest activity over the Cascades but at least a slight
chance of an afternoon storm or shower just about anywhere in the
region in a moist and unstable air mass. Temperatures will remain
well above normal but begin to moderate after Tuesday`s peak.

Wednesday night is shaping up to be wet as the cold front passes
through the forecast area with numerous showers overnight with
lingering showers mainly impacting the Idaho Panhandle through
Thursday. Instability and residual moisture will persist through
Friday over the region but with no well defined trigger. the safe
bet until further model runs refine the field of motion is to
continue with an unsettled pattern featuring at least a small
chance of showers and afternoon thunderstorms with temperatures
continuing above normal. /Fugazzi

&&

.AVIATION...
12Z TAFS: Low stratus is expected to develop at Spokane, Coeur
D`Alene, Pullman, and Lewiston. Bands of light rain will continue
to wrap around a decaying low pressure system near the Idaho/
Montana border. As this low drifts southward this morning, look
for breaks in the clouds. Daytime warming will lead to scattered
showers and possibly some isolated thunderstorms over the high
terrain of the Idaho Panhandle after 19z. Showers will end after
sunset and skies will clear overnight as high pressure builds over
the region. /EK


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        64  46  73  50  77  51 /  30  10   0   0   0   0
Coeur d`Alene  64  43  74  46  77  48 /  40  10   0   0   0   0
Pullman        61  42  71  45  75  48 /  50  10   0   0   0   0
Lewiston       66  46  75  49  80  51 /  40  10   0   0   0   0
Colville       69  42  79  44  80  45 /  20  10   0   0   0   0
Sandpoint      64  39  72  42  76  42 /  40  10   0   0   0   0
Kellogg        61  40  71  42  76  43 /  40  20   0   0   0   0
Moses Lake     72  44  79  47  83  48 /  10   0   0   0   0   0
Wenatchee      75  49  78  52  81  53 /  10   0   0   0   0   0
Omak           73  45  78  49  80  49 /  10   0   0   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...None.
&&

$$


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.