FXUS66 KOTX 220306
AFDOTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA
704 PM PST MON DEC 21 2009
.SYNOPSIS...
A COLD FRONT WILL MOVE THROUGH THE PACIFIC NORTHWEST TONIGHT
BRINGING ANOTHER ROUND OF RAIN AND HIGH MOUNTAIN SNOW TO THE REGION.
THE FRONT WILL ALSO BRING AN END TO THE FOG AND LOW CLOUDS THAT HAVE
PLAGUED CENTRAL WASHINGTON FOR THE LAST SEVERAL DAYS. AN UPPER
LEVEL DISTURBANCE WILL BRING THE CHANCE FOR SOME LIGHT SNOW TO THE
IDAHO PANHANDLE TUESDAY NIGHT INTO WEDNESDAY MORNING. COLD...BUT
DRY WEATHER IS EXPECTED FOR CHRISTMAS EVE THROUGH THE WEEKEND
FOLLOWING CHRISTMAS.
&&
.DISCUSSION...
UPDATE...ADJUSTMENTS MADE TO EVENING POPS AND CLOUD COVER. BANDS
OF RAIN CONTINUE TO SPREAD UP FROM NORTHEAST OREGON AND ACROSS
EASTERN WASHINGTON. INCREASED POPS SOME FOR THIS EVENING OVER THE
PALOUSE. THEREAFTER EXTRAPOLATION OF THE BACK EDGE OF THE CURRENT
SWATH OF PRECIPITATION CORRELATES WITH THE FORECAST OF A DRYING
TREND...WITH THE MAIN RISK FOR PRECIPITATION PUSHING INTO THE
NORTHEAST MOUNTAINS AND PANHANDLE OVERNIGHT WITH THE TROWAL
LIFTING ENE.
I WILL CONTINUE TO MONITOR THE HYDROLOGICAL CONDITIONS OVER THE
FAR NORTHEAST CWA. A FLOOD ADVISORY REMAINS IN EFFECT FOR THE NEXT
HOUR OR SO. I WILL ALSO BE TAKING A CLOSER LOOK AT OVERNIGHT
LOWS...WHICH MAY NEED TO BE RAISED A TAD IF DEWPOINTS DO NOT DROP
FAST ENOUGH. /JCOTE
&&
.AVIATION...
A MOIST FRONTAL SYSTEM WILL SLOWLY MOVE THROUGH THE REGION THIS
EVENING INTO EARLY TOMORROW BRINGING STEADY PCPN ACROSS
MUCH OF ERN WA/NRN ID. WE SEE A MIX OF VFR/MVFR CIGS ACCOMPANY
PCPN SHIELD WITH WIDESPREAD MTN OBSCURATIONS. A COLD FRNT WILL
SWEEP W TO E ENDING THE PCPN THREAT HOWEVER THE MOIST SW FLOW
WILL LIKELY RESULT IN INCR STRATUS FROM KPUW-KGEG-KCOE UNTIL
MIDDAY TUE. FURTHER WEST...COOLER/DRIER AIR MOVING IN BEHIND
THE FROPA IS EXPECTED TO GRADUALLY SCOUR OUT THE FG VCNTY KEAT/KMWH
DURING THE EVENING HRS. CONFIDENCE FOR THE WESTERN TERMINALS IS
VERY LOW. IF THE FG IS ABLE TO SCOUR OUT THIS EVENING...THERE IS
POTENTIAL FOR MIFG REDEVELOPMENT AS GRADIENTS RELAX AND SKIES CLEAR
AFT 10Z. WE SHOULD SEE A GENERAL IMPROVEMENT AFT 18Z FOR ALL TAF
SITES TUE UNDER A MUCH DRIER...COLDER AIRMASS. SB
&&
.PRELIMINARY POINT TEMPS/POPS...
SPOKANE 28 35 21 27 14 25 / 80 10 20 10 0 0
COEUR D'ALENE 30 34 25 28 15 26 / 90 10 40 10 0 0
PULLMAN 27 34 24 28 18 25 / 80 20 30 30 0 0
LEWISTON 33 39 26 35 22 31 / 70 20 20 20 0 0
COLVILLE 31 36 19 26 11 25 / 90 20 20 10 0 0
SANDPOINT 31 35 24 28 13 26 / 100 20 60 10 0 0
KELLOGG 29 31 23 26 15 25 / 100 40 60 40 10 0
MOSES LAKE 23 36 20 30 16 26 / 40 10 0 0 0 0
WENATCHEE 26 35 22 29 19 28 / 20 10 0 0 0 0
OMAK 27 34 18 24 12 25 / 50 10 0 0 0 0
&&
.OTX WATCHES/WARNINGS/ADVISORIES...
ID...NONE.
WA...NONE.
&&
$$
