FXUS66 KOTX 300540
AFDOTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA
940 PM PST SUN NOV 29 2009
.SYNOPSIS...
THE PASSAGE OF ANOTHER QUICK MOVING COLD FRONT MONDAY NIGHT WILL
PRODUCE SOME MOUNTAIN SNOWS FOR NORTH IDAHO AND BRIEF GUSTY NORTH
WINDS TUESDAY. FOLLOWING THIS...LOOK FOR MAINLY DRY CONDITIONS...
CHILLY TEMPERATURES...AND AREAS OF LOW CLOUDS AND FOG THE REST OF
THE WEEK.
&&
.DISCUSSION...
UPDATE FOR TONIGHT...MIDDLE AND UPPER LEVEL MOISTURE HAS BEEN ON
THE WANE ACROSS THE AREA AS THE LARGE SCALE RIDGE AXIS GENERALLY
HAS BEEN ARCING OVERHEAD THIS EVENING. THIS IS A RESULT OF THE
MEAN MID-LATITUDE FLOW BEING CENTERED OVER CENTRAL AND NORTHERN
BRITISH COLUMBIA. AS A RESULT...MIDDLE AND HIGH CLOUDS HAVE
GENERALLY CLEARED FROM SOUTH TO NORTH SLOWLY THIS EVENING.
HOWEVER...AS THEY HAVE DONE SO...THE FOG PRODUCT HAS REVEALED AN
ABUNDANCE OF LOW CLOUDS COVERING THE OKANOGAN VALLEY...WATERVILLE
PLATEAU...AND THE BULK OF THE VALLEYS OF THE EAST SLOPES OF THE
CASCADES. IN ADDITION...LIMITED CLEARING ACROSS THE REST OF THE
NORTHERN ZONES SEEMS TO BE INDICATING A BIT OF THE SAME...THOUGH
THE CLEARING IN THE MIDDLE AND UPPER LEVELS HAS YET TO BE
WIDESPREAD ENOUGH TO GET A GOOD VIEW OF THE STRATUS BELOW ON THE
FOG PRODUCT. THESE AREAS WITH STRATUS CURRENTLY SEEM THAT THEY
WOULD BE UNLIKELY TO REALIZE TEMPERATURE DROPS SIGNIFICANT ENOUGH
OVERNIGHT TO FORM RADIATION FOG WITH CURRENT DEWPOINT DEPRESSIONS
RUNNING 5F OR MORE. HOWEVER...AREAS ACROSS THE COLUMBIA BASIN AND
INTO THE WEST PLAINS OF SPOKANE MAY SEE ENOUGH RADIATIONAL COOLING
WITH NEGLIGIBLE SURFACE LAYER DRY AIR ADVECTION TO SEE PATCHY FOG
FORM OVERNIGHT TOWARD MORNING. OTHERWISE...MEAGER LIFT FROM THE
STILL ADVANCING NORTHWARD WARM FRONT IN BRITISH COLUMBIA STILL
EXISTS IN THE 290-300K LAYER ACROSS THE FAR NORTHEASTERN ZONES.
WHILE CONDENSATION PRESSURE DEFICITS WITH THIS LIFT ARE GENERALLY
AROUND 100 MB WHICH IS INDICATIVE OF THE FRONT BEING WELL NORTH OF
THE AREA...SOME WEAK UPSLOPE WITH SOUTHWESTERLY FLOW AT 10-15 KTS
AT 850 MB NOTED MAY RESULT IN A VERY ISOLATED FLURRY ACROSS THE
HIGHEST PEAKS OF NORTHEAST WASHINGTON AND NORTH IDAHO.
OTHERWISE...A DRY NIGHT IS IN STORE FOR THE FORECAST AREA. /FRIES
&&
.AVIATION...
STRATUS IS EVIDENT FROM KEAT TO KOMK THIS EVENING...AND WILL LIKELY
EXPAND OVERNIGHT FARTHER EAST IN THE VALLEYS FROM THOSE LOCATIONS.
HIGH CLOUDS HAVE CLEARED MOST OTHER AREAS...WITH GROUND FOG FORMING
ALONG RIVER VALLEYS AND ACROSS THE UPPER COLUMBIA BASIN OVERNIGHT
TOWARD MORNING. A WEAK MAINLY DRY FRONT WILL CROSS THE AREA FROM NW
TO SE MONDAY AFTERNOON...WITH ONLY A BROKEN MID-DECK RESULTING IN
MOST LOCATIONS AWAY FROM THE ID PANHANDLE. /FRIES
&&
.PRELIMINARY POINT TEMPS/POPS...
SPOKANE 30 41 29 37 23 36 / 0 0 10 0 0 0
COEUR D'ALENE 32 41 30 37 22 37 / 0 0 10 0 0 0
PULLMAN 31 42 33 40 26 39 / 0 0 10 10 0 0
LEWISTON 31 46 36 42 29 44 / 0 0 10 10 0 0
COLVILLE 36 41 27 37 22 36 / 0 10 20 0 0 0
SANDPOINT 33 37 28 35 21 33 / 0 10 20 10 0 10
KELLOGG 29 39 30 36 26 34 / 0 10 20 10 0 10
MOSES LAKE 28 43 30 41 25 39 / 0 0 0 0 0 0
WENATCHEE 34 44 31 42 29 39 / 0 0 0 0 0 0
OMAK 34 43 28 40 24 40 / 0 0 10 0 0 0
&&
.OTX WATCHES/WARNINGS/ADVISORIES...
ID...NONE.
WA...NONE.
&&
$$
