Winter Storm Warning 12, NWS Spokane, WA

000 
WWUS46 KOTX 240709
WSWOTX

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SPOKANE WA
1109 PM PST THU NOV 23 2006

...FIRST SIGNIFICANT SNOW OF THE SEASON EXPECTED TONIGHT FOR THE
LOWER ELEVATIONS OF EASTERN WASHINGTON AND THE IDAHO PANHANDLE...

.A WEATHER SYSTEM MOVING THROUGH THE REGION TONIGHT WILL PRODUCE
ACCUMULATING SNOW ABOVE 2500 FEET IN THE SPOKANE...COEUR
DALENE...KELLOGG... SANDPOINT...COLVILLE...AND PULLMAN AREAS.

IDZ003-004-WAZ033-241515-
/O.CON.KOTX.WS.W.0012.000000T0000Z-061124T1800Z/
IDAHO PALOUSE-CENTRAL PANHANDLE MOUNTAINS-WASHINGTON PALOUSE-
INCLUDING THE CITIES OF...MOSCOW...ST. MARIES...KELLOGG...
PINEHURST...OSBURN...WALLACE...MULLAN...PULLMAN
1109 PM PST THU NOV 23 2006

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST
FRIDAY...

A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST FRIDAY. 

SNOW ACCUMULATIONS OF 4 TO 6 INCHES ARE EXPECTED BY MORNING. THE
HEAVIEST SNOW WILL OCCUR EAST OF COLFAX AT ELEVATIONS ABOVE 2500
FEET. BELOW 2500 FEET A RAIN/SNOW MIX IS EXPECTED WITH LITTLE TO
NO ACCUMULATIONS. IN THE IDAHO PANHANDLE MOUNTAINS 6 TO 10 INCHES
OF SNOW CAN BE EXPECTED. SNOW WILL LIKELY CONTINUE THROUGH THE
EARLY MORNING HOURS.

IN ADDITION TO SNOW...SOUTHWEST WINDS 20 TO 30 MPH WITH GUSTS TO
40 MPH WILL PRODUCE AREAS OF BLOWING AND DRIFTING SNOW...
PARTICULARLY ACROSS EXPOSED PORTIONS OF THE PALOUSE AND NEAR
MOSCOW MOUNTAIN.

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW ARE
EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO POSSIBLE.  THIS WILL
MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

$$

IDZ002-WAZ036-241200-
/O.CON.KOTX.SB.Y.0001.000000T0000Z-061124T1200Z/
COEUR DALENE AREA-SPOKANE AREA-
INCLUDING THE CITIES OF...COEUR DALENE...POST FALLS...HAYDEN...
SPOKANE
1109 PM PST THU NOV 23 2006

...SNOW AND BLOWING SNOW ADVISORY REMAINS IN EFFECT UNTIL 4 AM
PST FRIDAY...

A SNOW AND BLOWING SNOW ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST
FRIDAY. 

SNOW ACCUMULATIONS OF 2 TO 4 INCHES ABOVE 2500 FEET ARE EXPECTED
TONIGHT IN THE SPOKANE...POST FALLS...AND COEUR DALENE AREAS. THE
HEAVIEST AMOUNTS WILL OCCUR ACROSS SOUTHERN PORTIONS OF SPOKANE
COUNTY AS WELL AS OVER IDAHO. SNOW ABOVE 2500 FEET IS EXPECTED TO
CONTINUE THROUGH THE EARLY MORNING HOURS. BELOW 2500 FEET EXPECT A
MIXTURE OF RAIN AND SNOW WITH ACCUMULATIONS NEAR AN INCH.

IN ADDITION TO THE SNOW...SOUTHWEST WINDS 20 TO 30 MPH WITH GUSTS
TO 40 MPH WILL DEVELOP OVERNIGHT. THIS WILL RESULT IN AREAS OF
BLOWING AND DRIFTING SNOW...ESPECIALLY OVER EXPOSED AREAS.

A SNOW AND BLOWING SNOW ADVISORY MEANS THAT PERIODS OF SNOW ALONG
WITH WINDS WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING. HOLIDAY TRAVELERS SHOULD BE AWARE OF THE POTENTIAL FOR
TRAVEL DIFFICULTIES AND STAY ABREAST OF THE WEATHER SITUATION.

$$

IDZ001-WAZ037-241200-
/O.CON.KOTX.SN.Y.0020.000000T0000Z-061124T1200Z/
NORTHERN PANHANDLE-NORTHEAST MOUNTAINS-
INCLUDING THE CITIES OF...SANDPOINT...RATHDRUM...BONNERS FERRY...
PRIEST RIVER...COLVILLE...DEER PARK...CHEWELAH...NEWPORT...
KETTLE FALLS
1109 PM PST THU NOV 23 2006

...SNOW ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

A SNOW ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY. 

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A SNOW
ADVISORY...WHICH IS IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 AM
PST FRIDAY.

SNOW IS EXPECTED TO CONTINUE THROUGH THE EARLY MORNING HOURS.
SNOW ACCUMULATIONS OF 2 TO 4 INCHES ARE EXPECTED BY MORNING IN THE
DEER PARK...SANDPOINT...COLVILLE...BONNERS FERRY...AND NEWPORT
AREAS...MAINLY ABOVE 2000 FEET. ACCUMULATIONS OF 6 TO 10 INCHES
ARE LIKELY IN THE MOUNTAINS OF NORTHEAST WASHINGTON AND FAR
NORTHERN IDAHO.

A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY
TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND
LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. HOLIDAY TRAVELERS
SHOULD BE AWARE OF THE POTENTIAL FOR TRAVEL DIFFICULTIES AND STAY
ABREAST OF THE WEATHER SITUATION.

$$

WAZ042-241200-
/O.CON.KOTX.SN.Y.0020.000000T0000Z-061124T1200Z/
EAST SLOPES NORTHERN CASCADES-
INCLUDING THE CITIES OF...LEAVENWORTH...MAZAMA...TWISP...WINTHROP
1109 PM PST THU NOV 23 2006

...SNOW ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

A SNOW ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY. 

SNOW WILL CONTINUE TO FALL THROUGH THE EARLY FRIDAY MORNING. SNOW
ACCUMULATIONS OF 5 TO 7 INCHES ARE EXPECTED BY MORNING. THE
HEAVIEST ACCUMULATIONS WILL OCCUR ALONG THE CREST. VALLEY
LOCATIONS INCLUDING MAZAMA AND PLAIN WILL SEE 2 TO 4 INCHES OF
SNOW BY MORNING.


A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY
TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND
LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. HOLIDAY
TRAVELERS SHOULD BE AWARE OF THE POTENTIAL FOR TRAVEL DIFFICULTIES
AND STAY ABREAST OF THE WEATHER SITUATION.

$$

000 
WWUS46 KOTX 241026
WSWOTX

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SPOKANE WA
226 AM PST FRI NOV 24 2006

...SNOW STORM DROPPING SOUTH...

.THE THREAT OF ACCUMULATING SNOW HAS SETTLED SOUTH OF THE SPOKANE
AND COEUR DALENE AREAS. ADDITIONAL SIGNFICANT SNOWS ARE EXPECTED
IN THE CENTERAL IDAHO PANHANDLE...MAINLY ABOVE 3000 FEET THROUGH
MID MORNING.

WAZ033-241130-
/O.CAN.KOTX.WS.W.0012.000000T0000Z-061124T1800Z/
WASHINGTON PALOUSE-
INCLUDING THE CITY OF...PULLMAN
226 AM PST FRI NOV 24 2006

...WINTER STORM WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS CANCELLED THE WINTER
STORM WARNING.

PERIODS OF SNOW WILL OCCUR THIS MORNING ACROSS THE WASHINGTON
PALOUSE...BUT WITH TEMPERATURES REMAINING ABOVE FREEZING...THE
MAJORITY OF THE AREA WILL EXPERIENCE ONLY MINOR SNOW
ACCUMULATIONS. EXPECT AN INCH OF SNOW OR LESS ON GRASSY SURFACES
THIS MORNING...BEFORE TEMPERATURES RISE INTO THE UPPER 30S THIS
AFTERNOON.

$$

IDZ001-WAZ037-042-241130-
/O.CAN.KOTX.SN.Y.0020.000000T0000Z-061124T1200Z/
NORTHERN PANHANDLE-NORTHEAST MOUNTAINS-
EAST SLOPES NORTHERN CASCADES-
INCLUDING THE CITIES OF...SANDPOINT...RATHDRUM...BONNERS FERRY...
PRIEST RIVER...COLVILLE...DEER PARK...CHEWELAH...NEWPORT...
KETTLE FALLS...LEAVENWORTH...MAZAMA...TWISP...WINTHROP
226 AM PST FRI NOV 24 2006

...SNOW ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS CANCELLED THE SNOW
ADVISORY.

THE THREAT FOR SIGNIFICANT SNOW HAS ENDED OVER THE EAST SLOPES OF
THE NORTHERN CASCADES. SNOW SHOWERS ARE LIKELY ALONG THE CREST OF
THE CASCADES TODAY...BUT ADDITIONAL ACCUMULATIONS ARE NOT EXPECTED
TO IMPACT TRAVEL THROUGH THE PASSES.


$$

IDZ002-WAZ036-241130-
/O.CAN.KOTX.SB.Y.0001.000000T0000Z-061124T1200Z/
COEUR DALENE AREA-SPOKANE AREA-
INCLUDING THE CITIES OF...COEUR DALENE...POST FALLS...HAYDEN...
SPOKANE
226 AM PST FRI NOV 24 2006

...SNOW AND BLOWING SNOW ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS CANCELLED THE SNOW
AND BLOWING SNOW ADVISORY. 

SCATTERED RAIN AND SNOW SHOWERS ARE EXPECTED THIS MORNING...BUT
ADDITIONAL SNOW ACCUMULATIONS ARE NOT EXPECTED TO IMPEDE TRAVEL.

$$

IDZ003-004-241800-
/O.CON.KOTX.WS.W.0012.000000T0000Z-061124T1800Z/
IDAHO PALOUSE-CENTRAL PANHANDLE MOUNTAINS-
INCLUDING THE CITIES OF...MOSCOW...ST. MARIES...KELLOGG...
PINEHURST...OSBURN...WALLACE...MULLAN
226 AM PST FRI NOV 24 2006

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING FOR ELEVATIONS ABOVE 2500 FEET...

A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING FOR THE MOUNTAINS OF THE CENTRAL IDAHO PANHANDLE ABOVE
2500 FEET.

AN ADDITIONAL 3 TO 6 INCHES OF SNOW IS LIKELY BETWEEN 3 AM AND 
10 AM FOR ELEVATIONS ABOVE 3000 FEET. FOR ELEVATIONS BETWEEN 2500
FEET AND 3000 FEET...SNOW ACCUMULATIONS OF 1 TO 3 INCHES ARE
EXPECTED MAINLY ON GRASSY SURFACES.

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW ARE
EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO POSSIBLE.  THIS WILL
MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

$$

000 
WWUS46 KOTX 241223
WSWOTX

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SPOKANE WA
423 AM PST FRI NOV 24 2006

...PERIODS OF HEAVY SNOW EXPECTED FOR THE IDAHO PANHANDLE THIS
MORNING...

.HEAVY SNOW WILL MAKE TRAVEL DANGEROUS FOR ELEVATIONS ABOVE 3000
FEET FOR PORTIONS OF THE CENTRAL IDAHO PANHANDLE THIS MORNING. A
BAND OF PRECIPITATION IS EXPECTED TO LINGER OVER THE MOSCOW...ST.
MARIES...KELLOGG...AND MULLAN AREAS THROUGH LATE MORNING.

IDZ003-004-241800-
/O.CON.KOTX.WS.W.0012.000000T0000Z-061124T1800Z/
IDAHO PALOUSE-CENTRAL PANHANDLE MOUNTAINS-
INCLUDING THE CITIES OF...MOSCOW...ST. MARIES...KELLOGG...
PINEHURST...OSBURN...WALLACE...MULLAN
423 AM PST FRI NOV 24 2006

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING FOR ELEVATIONS ABOVE 3000 FEET...

A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING FOR ELEVATIONS ABOVE 3000 FEET IN THE CENTRAL IDAHO
PANHANDLE...AND THE IDAHO PALOUSE.

AN ADDITIONAL 3 TO 6 INCHES OF SNOW IS LIKELY BETWEEN 5 AM AND
10 AM FOR ELEVATIONS ABOVE 3000 FEET. FOR ELEVATIONS BETWEEN
2500 FEET AND 3000 FEET...SNOW ACCUMULATIONS OF 1 TO 3 INCHES ARE
EXPECTED MAINLY ON GRASSY SURFACES. HEAVY SNOW WILL HAVE THE
POTENTIAL TO REDUCE VISIBILITIES TO LESS THAN A QUARTER MILE IN
SOME OF THE HEAVIER SNOW BANDS...WITH ACCUMULATION RATES OF 2
INCHES PER HOUR POSSIBLE.

TRAVELERS PLANNING TO DRIVE ON INTERSTATE 90 THROUGH LOOKOUT PASS
THIS MORNING SHOULD MONITOR THE WEATHER CLOSELY. DRIVING
CONDITIONS WILL BE DANGEROUS THIS MORNING. CHECK PASS CONDITIONS
BEFORE ATTEMPTING TO MAKE THE TRIP.

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW ARE
EXPECTED OR OCCURRING. GUSTY WINDS ARE ALSO POSSIBLE.  THIS WILL
MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

$$

000 
WWUS46 KOTX 241759
WSWOTX

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SPOKANE WA
959 AM PST FRI NOV 24 2006

.A MOIST FRONTAL BOUNDARY WILL BRING ADDITIONAL SNOW TO THE CAMAS
PRAIRIE THROUGH SATURDAY MORNING.

IDZ003-004-241900-
/O.EXP.KOTX.WS.W.0012.000000T0000Z-061124T1800Z/
IDAHO PALOUSE-CENTRAL PANHANDLE MOUNTAINS-
INCLUDING THE CITIES OF...MOSCOW...ST. MARIES...KELLOGG...
PINEHURST...OSBURN...WALLACE...MULLAN
959 AM PST FRI NOV 24 2006

...WINTER STORM WARNING WILL EXPIRE AT 10 AM PST THIS MORNING...

THE WINTER STORM WARNING WILL EXPIRE AT 10 AM PST THIS MORNING.
ADDITIONAL SNOW SHOWERS WILL OCCUR OVER THE CENTRAL PANHANDLE
MOUNTAINS THROUGH TONIGHT...BUT ADDITIONAL ACCUMULATIONS WILL BE LIGHT.

$$

IDZ027-250200-
/O.NEW.KOTX.SN.Y.0021.061124T1800Z-061125T1800Z/
LEWIS AND SOUTHERN NEZ PERCE COUNTIES-
INCLUDING THE CITIES OF...KAMIAH...CRAIGMONT...NEZPERCE...
WINCHESTER
959 AM PST FRI NOV 24 2006

...SNOW ADVISORY IN EFFECT UNTIL 10 AM PST SATURDAY ABOVE 2500 FEET...

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A SNOW
ADVISORY...WHICH IS IN EFFECT UNTIL 10 AM PST SATURDAY. 

ADDITIONAL SNOW ACCUMULATIONS OF 1 TO 2 INCHES CAN BE EXPECTED
TODAY ABOVE 3500 FEET. SNOW LEVELS WILL ALSO BE LOWERING TO 2500
FEET LATE TONIGHT INTO SATURDAY MORNING...WITH 2 TO 4 INCHES OF
ACCUMULATION. TOTAL SNOW ACCUMULATIONS FROM YESTERDAY EVENING
THROUGH SATURDAY MORNING WILL RANGE FROM 2 TO 4 INCHES BETWEEN
2500 TO 3500 FEET...AND 4 TO 7 INCHES ABOVE 3500 FEET.

A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY
TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND
LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING.

$$

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE SPOKANE WA
950 AM PST THU NOV 23 2006

.SYNOPSIS...THE ACTIVE WEATHER PATTERN OVER THE PACIFIC NORTHWEST
WILL CONTINUE THROUGH THE HOLIDAY WEEKEND. ANOTHER WEATHER SYSTEM
WILL MOVE THROUGH THE REGION THIS EVENING BRINGING THE POTENTIAL
FOR MORE PRECIPITATION. SINCE SNOW LEVELS HAVE DROPPED TO NEAR THE
VALLEY FLOOR...SOME LOCATIONS IN EASTERN WASHINGTON AND NORTHERN
IDAHO COULD EXPERIENCE THE FIRST SIGNIFICANT SNOW OF THE SEASON
TONIGHT.

&&

DISCUSSION... DID A QUICK UPDATE THIS MORNING TO INCREASE WINDS
IN THE MORNING...KEEPING BREEZY TO WINDY CONDITIONS ACROSS MOST OF
EASTERN WASHINGTON AND NORTH IDAHO THROUGH THE DAY TODAY. HAVE
ISSUED A WIND ADVISORY THROUGH THE AFTERNOON FOR EASTERN WA AND
WEST CENTRAL IDAHO. TWEAKED SOME MAX TEMPERATURES AS MANY ARE
APPROACHING THEIR FORECASTED HIGH TEMP...HOWEVER AM NOT
ANTICIPATING SIGNIFICANT HEATING TODAY AND TEMPERATURES WILL NOT
RISE SIGNIFICANTLY. SHOWERS WILL CONTINUE ACROSS NORTH IDAHO
THROUGH THE DAY AS INSTABILITY BEHIND THE FRONT REMAINS. /KOCH

PREV DISCUSSION... /ISSUED 500 AM PST THU NOV 23 2006/

DISCUSSION...

ISENTROPIC UPGLIDE FOR THE SHORTWAVE THIS EVENING IS SOMEWHAT
SHALLOWER THAN THE SYSTEM THAT MOVED THROUGH THE REGION LAST NIGHT
(WED NIGHT). MODEST FORCING SUGGEST Q-VECTOR CONVERGENCE IMPLIES
THAT THE BULK OF THE FORCING WILL BE DRIVEN BY VORTICITY
ADVECTION. WESTERLY FLOW WILL ALSO CONTRIBUTE TO OMEGA DRIVEN BY
UPSLOPE FLOW OVER THE IDAHO PANHANDLE AND FAR EASTERN WASHINGTON.
SINCE SNOW LEVELS WILL BE DOWN TO THE VALLEY FLOORS FROM PULLMAN
NORTH...THE FIRST SIGNIFICANT SNOW ACCUMULATION IS LIKELY FOR THE
SPOKANE AND COEUR DALENE AREAS AS WELL AS THE VALLEYS IN THE
IDAHO PANHANDLE. WITH THE POTENTIAL FOR HIGHER TRAFFIC VOLUME THIS
EVENING GIVEN THE HOLIDAY...I HAVE GONE AHEAD AND ISSUED A SNOW
ADVISORY FOR 2 TO 4 INCH ACCUMULATIONS. SPOKANE MAY BE ON THE LOW
END OF THIS AMOUNT...BUT SINCE THIS MAY BE THE FIRST ACCUMULATION
OF THE SEASON...I WILL POST HEADLINES A BIT MORE AGGRESSIVELY THAN
NORMAL. /GKOCH

FRIDAY THROUGH SATURDAY NIGHT...THE LONG WAVE PATTERN THIS PERIOD
WILL REMAIN A BROAD TROUGH OVER THE PACIFIC NORTHWEST. MODELS REMAIN
IN GOOD AGREEMENT ON THIS. A COUPLE SHORTWAVES ARE ALSO SHOWN TO
SLIDE DOWN THE PACIFIC COAST AND THEN CROSS THE CWA IN A WESTERLY
FLOW. THESE ARE RELATIVELY WEAK LOW PRESSURE AREAS. (THESE FOLLOW
BEHIND THE SYSTEM THAT EXITS FRIDAY MORNING.) BY LATE FRIDAY INTO
SATURDAY MORNING THE FIRST OF THE TWO COMES THROUGH...WITH A SMALL
AREA OF ISENTROPIC LIFT (WHICH MOVES INTO THE NORTHEAST) AND
MODERATE SYNOPTIC SUPPORT. THE SECOND MOVES THROUGH SATURDAY
PM...WITH LESS SUPPORT. BOTH DO NOT HAVE A LOT OF MOISTURE TO DEAL
WITH AND EXACT TIMING OF THESE SMALLER FEATURES IS TRICKY. BUT
OVERALL A RISK FOR SOME LIGHT SNOW SHOWERS WILL REMAIN IN THE
FORECAST AS THESE COME THROUGH. THE BETTER CHANCES ARE WITH THE
FIRST SYSTEM FRIDAY NIGHT INTO SATURDAY MORNING. TEMPERATURES WILL
BE NEAR TO SLIGHTLY BELOW AVERAGE.

SUNDAY THROUGH MONDAY...MODELS HAVE BEEN AND CONTINUE LEAN TOWARD
ANOTHER MODERATE TO STRONG SYSTEM APPROACHING THE AREA. AND THE
ECMWF AND GFS ARE STARTING TO COME TO A BIT MORE AGREEMENT. A
STRONGER JET STREAK MOVING DOWN THE PACIFIC COAST IS PROJECTED TO
STRENGTHEN THE UPPER TROUGH IN THE REGION (THE GFS EVEN CLOSES THE
LOW OFF/ECMWF KEEPS AN OPEN WAVE). GFS BLENDED WITH MORE
PROGRESSIVE ECMWF IS FAVORED SOLUTION. BY SUNDAY MORNING A SFC LOW
BEGINS TO DEVELOP NEAR THE WA/OR COAST IN THE LFQ OF THE JET. THIS
LOW IN TURN BEGINS TO MOVE EASTWARD...STRENGTHENING AS IT DOES.
THE EXACT TRACK OF THE LOW HAS BEEN WOBBLING A BIT...SOME TAKING
IT AS FAR SOUTH TOWARD THE OR/CALIF BORDER...BUT IN THE PAST 4-5
RUNS THE MODELS HAVE BEEN TRACKING THE LOW CLOSER TO THE OR/WA
BORDER. SYNOPTIC FORCING (AS INDICATED IN THE Q-CONVERGENCE/OMEGA
FIELD/FRONTOGENETIC FORCING) BEGINS TO STRENGTHEN OVER THE CWA BY
ABOUT 18Z SUNDAY...ALONG WITH ISENTROPIC LIFT. THE ISENTROPIC LIFT
IS INDICATED ON THE 285-290K SFC STRENGTHENING OVER THE SOUTH AND
EAST CWA FROM 18Z SUN TO 00Z MON...BEFORE BEGINNING TO SHIFT
TOWARD ID OVERNIGHT. CURRENT TRACK OF THE SFC LOW (WHICH IS
CONSISTENTLY BEEN SHOWN TO BE DEEPENING AS IT TRACKS THROUGH THE
AREA) AND THE PLACEMENT OF THE FRONTOGENETIC FORCING BETWEEN 850
AND 700 MB SUGGESTS THE POTENTIAL FOR SOME MODERATE QPF AMOUNTS
FOR A TIME SUNDAY NIGHT. IT IS STILL SOME TIME OUT TO PIN DOWN
ANYTHING...BUT SOME DECENT SNOW AMOUNTS ARE POSSIBLE OUT OF THIS
SYSTEM NEAR AND SOUTH OF SPOKANE SOUTHWARD INTO THE PALOUSE. SO
THIS SYSTEM OBVIOUSLY BEARS WATCHING...ESPLY FOR FOLK RETURNING
FROM THE THANKSGIVING HOLIDAY. BIG LIMITING FACTOR WOULD BE THE
AMOUNT OF MOISTURE...BUT PWATS ARE IN THE 0.30 TO 0.40 INCH RANGE
WHICH IS NEAR 100 PERCENT OF AVG. BY MONDAY THE SYSTEM IS
PROJECTED TO BEGIN MOVING OUT WITH POPS WINDING DOWN AND BEHIND IT
A NORTHERLY FLOW BEGINS TO BRING IN COLDER/ARCTIC AIR.

TUESDAY AND WEDNESDAY LOOK TO BE CALMER DAYS...WITH DRIER AIR AND
SFC HIGH PRESSURE MOVING IN. NOT A LOT OF CHANGES IN THE FCST
HERE. MODELS CONTINUE TO SPEAK OF AN ARCTIC INTRUSION WITH A
NORTH TO NORTHEASTERLY FLOW. HOW DEEP THE COLD AIR IS AND ITS
CAPABILITY OF COMING OVER THE CANADIAN MTNS WILL HAVE TO BE
MONITORED (WILL KEEP AN EYE ON THE DEPTH OF THE COLD AIR IN
SOUNDINGS EAST OF THE CANADIAN ROCKIES)...BUT COLD AIR CAN SPILL
DOWN THE TRENCHES. OVER THE PAST 3-4 RUNS MODELS HAVE BEEN
ADVERTISING IT. /JCOTE

AVIATION...COLD AIR ALOFT HAS CONTRIBUTED TO INSTABILITY SHOWERS
OVER THE ID PANHANDLE. SCATTERED MVFR TO LIFR CONDITIONS CAN BE
EXPECTED WITH THESE TERRAIN DRIVEN SNOW SHOWERS. MORE WIDESPREAD
CEILING AND VISIBILITY RESTRICTIONS ARE ON THE WAY THIS EVENING AS
THE VORTICITY MAX NEAR 130W ROTATES INLAND. RAIN SHADOW EFFECT
WILL LIKELY KEEP VFR CONDITIONS IN THE LEE OF THE CASCADES...BUT
LIFR IS EXPECTED TO PREVAIL IN THE KGEG...KPUW...AND KCOE AREAS
AFTER 02Z WITH ACCUMULATING SNOW DOWN TO THE VALLEY FLOOR. SOME
IMPROVEMENT IN CONDITIONS WILL OCCUR AFTER 06Z.

&&

.PRELIMINARY POINT TEMPS/POPS...
SPOKANE        40  30  38  28  35  26 /  30  80  40  40  30  40
COEUR DALENE  40  29  39  28  35  27 /  40  80  40  50  30  40
PULLMAN        42  31  39  31  37  29 /  20  70  40  40  30  40
LEWISTON       48  35  47  33  42  33 /  20  60  40  30  40  40
COLVILLE       36  25  37  24  33  21 /  40  90  30  60  50  40
SANDPOINT      40  28  37  27  35  26 /  50  90  60  60  50  50
KELLOGG        40  30  38  30  34  29 /  50  90  70  50  50  60
MOSES LAKE     46  29  43  29  39  28 /  20  30  20  20  20  20
WENATCHEE      44  28  42  28  37  25 /  20  30  20  20  20  30
OMAK           41  27  40  26  35  22 /  20  60  20  30  20  30

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...WIND ADVISORY UNTIL 3 PM PST THIS AFTERNOON FOR COEUR DALENE
     AREA...IDAHO PALOUSE.

     SNOW ADVISORY FROM 4 PM THIS AFTERNOON TO 4 AM PST FRIDAY FOR
     CENTRAL PANHANDLE MOUNTAINS...COEUR DALENE AREA...NORTHERN
     PANHANDLE.

WA...WIND ADVISORY UNTIL 3 PM PST THIS AFTERNOON FOR LOWER GARFIELD
     AND ASOTIN COUNTIES...SPOKANE AREA...WASHINGTON PALOUSE.

     SNOW ADVISORY FROM 4 PM THIS AFTERNOON TO 4 AM PST FRIDAY FOR
     NORTHEAST MOUNTAINS...SPOKANE AREA.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SPOKANE WA
953 AM PST THU NOV 23 2006

IDZ001>004-WAZ032-033-036-037-241800-
NORTHERN PANHANDLE-COEUR DALENE AREA-IDAHO PALOUSE-
CENTRAL PANHANDLE MOUNTAINS-LOWER GARFIELD AND ASOTIN COUNTIES-
WASHINGTON PALOUSE-SPOKANE AREA-NORTHEAST MOUNTAINS-
INCLUDING THE CITIES OF...SANDPOINT...RATHDRUM...BONNERS FERRY...
PRIEST RIVER...COEUR DALENE...POST FALLS...HAYDEN...MOSCOW...
ST. MARIES...KELLOGG...PINEHURST...OSBURN...WALLACE...MULLAN...
CLARKSTON...PULLMAN...SPOKANE...COLVILLE...DEER PARK...CHEWELAH...
NEWPORT...KETTLE FALLS
953 AM PST THU NOV 23 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH
IDAHO...NORTHEAST WASHINGTON AND SOUTHEAST WASHINGTON.

THE FOLLOWING WATCHES WARNINGS OR ADVISORIES ARE CURRENTLY IN EFFECT
   WIND ADVISORY IN EFFECT UNTIL 3 PM PST THIS AFTERNOON FOR
     COEUR D ALENE AREA...IDAHO PALOUSE...LOWER GARFIELD AND
     ASOTIN COUNTIES...WASHINGTON PALOUSE...SPOKANE AREA
   SNOW ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 AM PST
     FRIDAY FOR NORTH IDAHO PANHANDLE...COEUR D ALENE
     AREA...CENTRAL PANHANDLE MOUNTAINS...SPOKANE
     AREA...NORTHEAST MOUNTAINS

PLEASE SEE THE FOLLOWING PRODUCTS FOR MORE INFORMATION.
   SEAWSWOTX  /WWUS46 KOTX/
   SEANPWOTX  /WWUS76 KOTX/

.DAY ONE...TODAY AND TONIGHT

THROUGH EARLY THIS AFTERNOON...SNOW SHOWERS WILL BRING 1 TO 3
INCHES OF ACCUMULATION TO THE MOUNTAINS OF NORTHEAST WASHINGTON
AND THE MOUNTAINS OF THE IDAHO PANHANDLE. STRONG WINDS WILL ALSO
IMPACT SOUTHERN PORTIONS OF THE SPOKANE AND COEUR DALENE AREA AS
WELL AS OVER THE PALOUSE THROUGH MID AFTERNOON.

THIS EVENING 2 TO 4 INCHES OF SNOW IS LIKELY IN THE VALLEYS AND
LOWLANDS OF NORTHEAST WASHINGTON AND NORTHERN IDAHO. THE
COMMUNITIES OF SPOKANE...COEUR DALENE...SAND POINT...
COLVILLE...AND KELLOGG CAN EXPECT TREACHEROUS DRIVING CONDITIONS
BY MID EVENING. IN ADDITION TO THE ACCUMULATIONS EXPECTED THIS
MORNING...THE MOUNTAINS OF NORTHEAST WASHINGTON AND THE MOUNTAINS
OF THE IDAHO PANHANDLE WILL LIKELY RECEIVE AN ANOTHER 4 TO 6
INCHES OF SNOW TONIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

OUR ACTIVE WEATHER PATTERN WILL CONTINUE INTO EARLY NEXT WEEK.
NUMEROUS WEATHER DISTURBANCES WILL BRING SNOW TO THE REGION.
SIGNIFICANT SNOW IS POSSIBLE FOR THE MOUNTAINS AND LOWLANDS SUNDAY
AND SUNDAY NIGHT...FOLLOWED BY WELL BELOW AVERAGE TEMPERATURES
MONDAY THROUGH WEDNESDAY.

IDZ026-027-WAZ031-034-035-038-041>044-241800-
LEWISTON AREA-LEWIS AND SOUTHERN NEZ PERCE COUNTIES-
NORTHEAST BLUE MOUNTAINS-MOSES LAKE AREA-UPPER COLUMBIA BASIN-
OKANOGAN HIGHLANDS-WENATCHEE AREA-EAST SLOPES NORTHERN CASCADES-
OKANOGAN VALLEY-WATERVILLE PLATEAU-
INCLUDING THE CITIES OF...LEWISTON...KAMIAH...CRAIGMONT...
NEZPERCE...WINCHESTER...ANATONE...PEOLA...MOSES LAKE...EPHRATA...
OTHELLO...QUINCY...RITZVILLE...COULEE DAM...ODESSA...
ELECTRIC CITY...WILBUR...GRAND COULEE...COULEE CITY...REPUBLIC...
INCHELIUM...WENATCHEE...LEAVENWORTH...MAZAMA...TWISP...WINTHROP...
OMAK...OKANOGAN...BREWSTER...BRIDGEPORT...OROVILLE...WATERVILLE...
MANSFIELD
953 AM PST THU NOV 23 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
IDAHO...CENTRAL WASHINGTON...EAST CENTRAL WASHINGTON...NORTH
CENTRAL WASHINGTON AND SOUTHEAST WASHINGTON.

.DAY ONE...TODAY AND TONIGHT

LIGHT SNOW IS EXPECTED TO SPREAD ACROSS CENTRAL AND EASTERN
WASHINGTON THIS EVENING. SOME MINOR ACCUMULATIONS ARE POSSIBLE IN
THE LOWLANDS...MAINLY NORTH OF HIGHWAY 2.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

OUR ACTIVE WEATHER PATTERN WILL CONTINUE INTO EARLY NEXT WEEK.
NUMEROUS WEATHER DISTURBANCES WILL BRING SNOW TO THE MOUNTAINS.
SIGNIFICANT SNOW IS POSSIBLE FOR THE MOUNTAINS AND LOWLANDS SUNDAY
AND SUNDAY NIGHT...FOLLOWED BY WELL BELOW AVERAGE TEMPERATURES
MONDAY THROUGH WEDNESDAY.