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000
FXUS66 KOTX 181754
AFDOTX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA
1054 AM PDT Sat May 18 2013

.SYNOPSIS...
Scattered showers and isolated thunderstorms will develop again
this afternoon and evening. The greatest threat of thunder will
occur over the northeast corner of Washington and much of the
Idaho Panhandle. Precipitation chances will diminish a bit on
Sunday and by Monday most locations will be dry. This drying will
come to an abrupt end by Tuesday afternoon and into Wednesday as a
a very cool and wet upper level low parks itself over the Inland
Northwest. Steady, moderate precipitation will be possible
especially over northeast Washington and the northern Panhandle.

&&

.DISCUSSION...
Water vapor satellite imagery shows a mid level wave tracking
across Eastern Washington and North Idaho this morning. This
combined with mid level instability will continue to generate
showers this morning over the Okanogan Valley and Highlands,
Northeast Washington Mountains, and over North Idaho mainly north
of Lewiston. For this afternoon into the evening hours another
wave will track across the region which combined with afternoon
heating will generate more showers especially over the northern
mountains where high dew points in the upper 40s and lower 50s
exist due to the shower activity this morning. The forecast for
this morning has been updated to increase shower wording in the
valleys north of Highway 2 in Washington...and over North Idaho.
Also made some sky cover adjustments to show more cloud cover this
morning...and to increase clouds over Central Washington this
afternoon as the next wave crosses the Cascades.  These clouds will
keep high temperatures down more then previously expected and highs
were adjusted downward mainly areas north of a line from Omak to
Spokane to Kellogg.  JW

&&

.AVIATION...
18z TAFS: An upper level trough and weak disturbances embedded
within will aid in generating showers especially over the
mountains.  Isolated thunderstorms will also be possible mainly over
the mountains north of the Columbia Basin from 20z today through 03z
this evening. Westerly flow in the mid levels will lead to downslope
flow off the Cascades with dry conditions persisting at KEAT/KMWH.
CIGS are expected to be primarily VFR...with brief MVFR conditions
possible around KSFF/KCOE through 20z.  JW

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        63  45  66  46  70  49 /  40  20  20  10   0  10
Coeur d`Alene  62  44  64  43  69  45 /  60  30  30  20   0  10
Pullman        62  43  63  41  69  45 /  20  20  20  10   0  10
Lewiston       69  49  70  48  76  51 /  20  20  20  10   0  10
Colville       66  44  73  43  76  44 /  70  40  30  20  10  10
Sandpoint      60  43  64  42  69  43 /  70  40  40  30  10  10
Kellogg        58  44  60  45  67  46 /  60  30  40  40  10  10
Moses Lake     72  47  76  45  79  48 /  10  10  10   0   0  10
Wenatchee      69  48  72  49  76  51 /  10  10  10   0   0  10
Omak           69  43  74  42  77  46 /  50  20  10  10  10  10

&&

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

$$