Freeze Warning 1, NWS Spokane, WA

000 
WWUS76 KOTX 251214
NPWOTX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SPOKANE WA
514 AM PDT TUE SEP 25 2007

...FREEZE WARNING IS CANCELLED...


IDZ003-WAZ033-251315-
/O.CAN.KOTX.FZ.W.0001.000000T0000Z-070925T1600Z/
IDAHO PALOUSE-WASHINGTON PALOUSE-
INCLUDING THE CITIES OF...MOSCOW...PULLMAN
514 AM PDT TUE SEP 25 2007

...FREEZE WARNING IS CANCELLED FOR THE WASHINGTON AND IDAHO
PALOUSE...

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS CANCELLED THE FREEZE
WARNING FOR THE WASHINGTON AND IDAHO PALOUSE. A WEAK COLD FRONT
HAS PRODUCED CLOUDS AND LIGHT WINDS IN THE PULLMAN...MOSCOW...
AND COLFAX AREAS EARLY THIS MORNING. THIS FRONT HAS CAUSED JUST
ENOUGH MIXING TO WARM TEMPERATURES INTO THE UPPER 30S TO LOWER 40S
IN MOST AREAS IN THE PALOUSE. FREEZING TEMPERATURES ARE NO LONGER
EXPECTED THIS MORNING.

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA
241 PM PDT MON SEP 24 2007

.SYNOPSIS...
A MAINLY DRY PATTERN IS EXPECTED OVER THE INLAND NORTHWEST UNTIL
THURS NIGHT WHEN A FAIRLY STRONG COLD-FRONT BEGINS TO MOVE INTO THE
REGION. IN THE WAKE OF THIS FRONT...SHOWERY...OCASIONALLY WINDY...AND
COOL WEATHER WILL BE COMMON INTO THE WEEKEND.

&&

.DISCUSSION...
TONIGHT THROUGH THURSDAY...A SHORTWAVE RIDGE OVER THE INLAND
NORTHWEST THIS AFTERNOON WILL GAVE WAY TO A WEAK FRONT DROPPING
DOWN FROM BC OVERNIGHT. THIS FEATURE DOES HAVE A MOISTURE TAP OF
JUST OVER AN INCH AND WATER VAPOR SATELLITE SHOWS SOME DARKENING
IN THE OFFSHORE WATERS IN THE WAKE OF THE FRONT. THIS FRONT WILL
SLIDE FROM THE NORTHWEST AND FURTHER WEAKEN OVERNIGHT AS IT
CROSSES THE CASCADES AND MINORING OUT AS IT PASSES ACROSS NE WA
AND THE IDAHO PANHANDLE. THE MODELS SHOW ONLY A SLIGHT INCREASE OF
MOISTURE REACHING THE EAST SIDE OF THE CASCADES. THIS COUPLED WITH
WEAK ISENTROPIC LIFT AT THE 300K SURFACE AND MOISTURE ABOVE 700 MB
SPREADING ALONG THE CANADIAN BORDER...LEADS TO JUST A SMALL CHANCE
OF MEASURABLE RAIN AND THIS WOULD BE RELEGATED TO THE HIGHER
TERRAIN. THE QVECTORS WITH THIS FEATURE REFLECT A DRAMATIC
WEAKENING THROUGH THE NIGHT AND INTO TUESDAY MORNING WITH THE BEST
LIFT RESIDING IN BC. ANTICIPATE AN INCREASE OF MID LEVEL CLOUDS
LATE TONIGHT THROUGH TUESDAY MORNING WITH PARTIAL CLEARING DURING
THE AFTERNOON. BEST CHANCE OF PRECIPITATION WILL BE ACROSS THE
NORTHERN MOUNTAINS THROUGH MID MORNING...AND THEN SHIFTING TO ID
PANHANDLE AS WESTERLY POST FRONTAL FLOW ENHANCES SHOWERS IN THE
UPSLOPE SHOWERS. EVEN THOUGH THE BEST INSTABILITY WILL SHIFT EAST
INTO MONTANA...WILL KEEP SLIGHT CHANCE OF SHOWERS ALONG THE
BITTERROOT CREST INTO EARLY EVENING. BY WEDNESDAY THROUGH
THURSDAY...A FLAT RIDGE WILL RETURN TO THE REGION WITH DRY AND
WARMING CONDITIONS. TEMPERATURES WILL RETURN TO NORMAL VALUES BY
WEDNESDAY...AND PUSH ABOVE NORMAL ON THURSDAY AS THE FLOW ALOFT
BACKS TO THE SOUTHWEST WITH INCREASING MID AND HIGH LEVEL CLOUDS.
/RFOX.

THURS NT THROUGH MON...FOCUS WILL BE ON THURS NIGHTS FROPA AND
FRIDAYS POST-FRONTAL WX. THE VARIOUS GUIDANCE WITH THIS STRONGEST
WAVE OF THE FCST CYCLE IS SHOWING GENERAL CONSISTENCY AS FAR AS
TIMING THIS FAIRLY QUICK-MOVING FEATURE. FROPA THURS NT WILL MEAN
THAT THE MAINLY LIGHT WIDESPREAD STRATIFORM PCPN THREAT LATE THURS
WILL QUICKLY TRANSITION TO A MUCH MORE UNSTABLE SHOWERY THREAT
FRI. THOUGH THE SPEED OF THE STEERING FLOW WAY OUT ON DAY FOUR (FRI)
WONT ALLOW US TO GET TOO SPECIFIC ABOUT FRONTAL PASSAGE TIMING...IT
DOES APPEAR THAT FRI IS STILL THE DAY OF CONCERN AS FAR AS WIND...
SNOW LEVELS...AND THUNDER POTENTIAL IS CONCERNED. POST-FRONTAL DRY
SLOT IS ALREADY NOSING E INTO THE COLUMBIA BASIN FRI MORNING WITH THE
SFC CYCLONE WELL INTO SRN BC AND WRN ALBERTA. THOUGH THE COLUMBIA
BASIN WILL LIKELY SEE SOME SUN FRI MORNING...IT WILL ALSO BE UNDER A
SPEED MAX JUST ABOVE THE SFC OF 30 KT COINCIDENT WITH THE DRY SLOT.
EVEN BY MIDDAY FRI...WINDY WX WILL BE COMMON FOR MOST SITES NEAR THE
CASCADES AND WRN BASIN BEFORE THE PRESSURE GRADIENTS WEAKEN
SIGNIFICANTLY BY FRI AFTERNOON. THAT SAID...WEVE PUT WINDY WX IN THE
FCST...BUT ONLY INCLUDED IT FOR THE MORNING HRS FRIDAY. UPPER TROF
AXIS...VORT MAX AND POOL OF STEEPEST MID-LEVEL LAPSE RATES WILL BE
DIRECTLY OVER ERN WA/ N ID LATE FRI. THIS WILL MEAN A MARGINAL
LOW-END AFTERNOON THUNDER THREAT...BUT MORE IMPORTANTLY WILL KEEP THE
SHOWER THREAT HIGH FOR THE CASCADE CREST AS WELL AS N ID AND NE WA
UNDER THE WEST WLY FLOW. SNOW LEVELS UNDER THIS COLDEST AIR ALOFT
AND INSTABILITY WILL LOWER TO AROUND 5-6.5K FT MSL FRI. BZ

&&

.AVIATION...
THE IFR FOG/STRATUS WILL CONTINUE TO LIFT FROM THE VALLEYS NORTH
OF KGEG-KCOE AND WIDESPREAD VFR CONDITIONS WILL BE FOUND AFTER
19-20Z. CIRRUS WILL INCREASING FROM THE WEST AFTER 22Z AND
LOWERING TO AN AC/MID LEVEL DECK BETWEEN 06-12Z. LIGHT RAIN IS
POSSIBLE IN THE HIGHER ELEVATIONS OF THE NRN CASCADES AND OKANOGAN
HIGHLANDS BY 12-18Z. RFOX.

&&

.PRELIMINARY POINT TEMPS/POPS...
SPOKANE        42  65  44  68  45  71 /  10  10   0   0   0  10
COEUR DALENE  41  65  45  69  46  72 /  10  10   0   0   0  10
PULLMAN        36  66  39  69  40  73 /   0  10   0   0   0   0
LEWISTON       44  72  48  74  49  79 /   0  10   0   0   0   0
COLVILLE       38  67  38  72  39  73 /  10  10   0   0   0  10
SANDPOINT      37  62  40  67  41  68 /  10  20   0   0   0  10
KELLOGG        38  64  42  67  43  70 /   0  20  10   0  10  10
MOSES LAKE     42  73  44  74  45  77 /  10   0   0   0   0  10
WENATCHEE      48  71  50  74  51  75 /  10   0   0   0   0  10
OMAK           42  66  42  73  43  74 /  10  10   0   0   0  10

&&

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