Area Forecast Discussion
Issued by NWS Spokane, WA

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436
FXUS66 KOTX 202336
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
436 PM PDT Thu Jul 20 2017

.SYNOPSIS...

A warming trend is expected into the weekend, peaking on Sunday,
before a dry cold front passage Sunday night allows temperatures
to dip a little. Yet overall it remains warm into next week.
Isolated afternoon and evening thunderstorms may form near the
British Columbia Border, as well as over extreme Southeast
Washington and the lower Idaho Panhandle, through the first part
of the next week.

&&

.DISCUSSION...
Tonight through Saturday: A cold front will shift east of the
region tonight with pressure gradients and winds gradually
weakening this evening and overnight. There is another frontal
system located over the Gulf of Alaska. This system has a better
moisture tap, but much of the precipitation will miss us and head
into BC. Cloud cover will increase as the warm sector moves in
over the region on Friday. Thicker clouds will be across the
northern portion of the region. Saturday will be less cloudy as
the warm frontal processes shift north of the region. Temperatures
at 850 mbs will increase from around 17-18 Celsius on Friday to
around 20-21 Celsius on Saturday. This will result in a jump in
temperatures from the low to mid 80s back into the mid 80s to mid
90s by Saturday. /SVH

Saturday night through Thursday: Generally flattened ridge of high
pressure allows disturbances to brush over the top of it and bring
minor slight chances of thunderstorms to locations within close
proximity of the British Columbia Border and the East Slopes of the
North Washington Cascades Saturday night and Sunday. Sunday night a
dry cold front passes through and allows for an increase in Cascade
gap winds. With the Sunday night dry cold front passage Monday will
be cooler and the brief shortwave ridging moving in will allow for
winds primarily blowing out from a cool northerly direction.  Late
Monday afternoon and on through the evening models depict convection
firing up over Oregon that could move northeast with a storm motion
of 20 mph, thus moving across the Blue Mountains and further
northeast across parts of the Washington and Idaho Palouse into the
southern half of the North Idaho Panhandle. Models suggest a
somewhat similar repeat pattern Tuesday through Thursday with
convection firing up in Oregon and moving northeast with a slightly
quicker storm motion from southwest to northeast at 25 mph which
would take any formed thunderstorms through the similar route marked
out and up through portions of extreme Southeast Washington and the
southern half of the North Idaho Panhandle along with additional
afternoon and evening thunderstorm development within close
proximity of the British Columbia border as well. /Pelatti


&&

.AVIATION...
00Z TAFS: A mid-level trough moves across the region, with some
middle to high clouds and breezy conditions this evening. Winds
will abate after 02-04Z at most locations, but may hold on longer
near EAT. Gusts around 25kts will be possible. Some patchy blowing
dust is possible over the Columbia Basin early this evening too.
Otherwise VFR conditions are expected. A limited -shra/-tsra
threat will be found near the Cascades and Canadian border, but
TAF sites are expected to remain dry. Friday will be dry, with
lingering middle to high clouds and lighter winds. /J. Cote`

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        56  81  61  88  64  93 /   0   0   0   0   0   0
Coeur d`Alene  53  80  56  86  59  91 /   0   0   0   0   0   0
Pullman        52  80  56  86  59  91 /   0   0   0   0   0   0
Lewiston       59  88  61  94  66 100 /   0   0   0   0   0   0
Colville       50  83  55  89  57  93 /   0   0   0   0   0   0
Sandpoint      47  79  52  85  52  89 /   0   0   0   0   0   0
Kellogg        50  78  52  83  56  89 /   0   0   0   0   0   0
Moses Lake     54  86  58  93  60  97 /   0   0   0   0   0   0
Wenatchee      58  87  65  92  68  95 /   0   0   0   0   0   0
Omak           55  87  61  93  62  97 /   0   0  10   0   0   0

&&

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

$$



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