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AREA FORECAST DISCUSSION

 
 FXUS66 KOTX 250141
 AFDOTX
 
 AREA FORECAST DISCUSSION
 NATIONAL WEATHER SERVICE SPOKANE WA
 541 PM PST TUE NOV 24 2009
 
 .SYNOPSIS...
 A WEAK FRONTAL SYSTEM WILL BRING SOME VERY LIGHT PRECIPITATION TO
 THE AREA TONIGHT. THE THANKSGIVING HOLIDAY WILL BE CLOUDY WITH
 LIGHT PRECIPITATION MOVING IN FROM THE WEST LATE IN THE DAY. ON
 FRIDAY A COLD FRONT WILL PASS THROUGH WITH ANOTHER REASONABLE
 CHANCE OF MOUNTAIN SNOW AND VALLEY RAIN OR SNOW. CONDITIONS WILL
 REMAIN CLOUDY AND UNSETTLED INTO NEXT WEEKEND.
 
 
 
 
 &&
 
 .DISCUSSION...
 
 UPDATE FOR THIS EVENING...OBSERVATIONS AT MULLAN PASS HAVE BEEN
 INDICATING FREEZING RAIN FOR THE PAST TWO HOURS. TAKING A LOOK AT
 SOUNDINGS OVER THE CENTRAL IDAHO PANHANDLE FROM THE 18Z NAM...IT
 SEEMS THAT A NEARLY ISOTHERMAL SATURATED LAYER STRADDLING THE -1
 TO -2C LINE EXTENDS OVER A RATHER DEEP LAYER STARTING BETWEEN 4000
 AND 4500 FEET. THE 18Z NAM ALSO INDICATES SOME VERY WEAK NEGATIVE
 OMEGAS IN THIS LAYER...POSSIBLY ENOUGH TO GENERATE SOME VERY LIGHT
 FREEZING DRIZZLE OR FREEZING RAIN GENERALLY ABOVE 4000 TO 4500
 FEET. BECAUSE OF A LACK OF DEEPER MOISTURE IN THE DENDRITIC LAYER
 ALOFT AND RATHER NEGLIGIBLE SYNOPTIC SCALE ASCENT...THE CHANCE OF
 A SEEDER-FEEDER SNOWFALL GETTING RID OF THE MOIST LAYER DOWN NEAR
 850 OR 800 MB SEEM RATHER SMALL...SO THE RISK OF FREEZING DRIZZLE
 SEEMS LIKE IT SHOULD CONTINUE THROUGH THE EVENING.
 HOWEVER...OVERNIGHT FREEZING LEVELS LOOK TO RISE TOWARD 8000 FEET
 BY ABOUT 2 AM...SO THE CHANCE OF FREEZING DRIZZLE SHOULD END
 OVERNIGHT TOWARD MORNING. /FRIES
 
 
 &&
 
 .AVIATION...
 A WEAK RIDGE OF HIGH PRESSURE WILL BUILD OVER EASTERN WASHINGTON AND 
 NORTHERN IDAHO TONIGHT AND TOMORROW. SOME LIGHT RAIN AND SNOW 
 SHOWERS WILL LINGER OVER THE MOUNTAINS OBSCURING THE MOUNTAINS. LOW 
 CLOUDS WILL LIKELY FORM IN THE SPOKANE AND COEUR D`ALENE AREAS 
 BETWEEN 09Z AND 12Z AND LINGER THROUGH TOMORROW AFTERNOON. CEILINGS 
 WILL RANGE FROM 500 FEET TO 2000 FEET. LOW CEILINGS WILL ALSO IMPACT 
 THE WENATCHEE AREA THROUGH TOMORROW AFTERNOON. /GKOCH
 
 
 
 &&
 
 .PRELIMINARY POINT TEMPS/POPS...
 SPOKANE        34  45  34  42  36  39 /  10   0  10  10  40  60 
 COEUR D`ALENE  34  45  33  42  35  39 /  20  10  10  10  40  60 
 PULLMAN        34  47  34  46  35  38 /  10   0   0  10  30  50 
 LEWISTON       36  51  37  49  39  45 /   0   0   0  10  10  30 
 COLVILLE       33  44  34  41  34  41 /  30  20  30  30  50  60 
 SANDPOINT      31  41  32  38  35  37 /  20  10  20  10  30  70 
 KELLOGG        33  45  32  41  35  35 /  40  10  10  10  30  80 
 MOSES LAKE     33  48  33  44  34  45 /   0   0  10  20  40  20 
 WENATCHEE      35  46  35  43  34  44 /   0  10  30  20  30  10 
 OMAK           34  45  34  42  32  41 /  10  10  40  50  50  30 
 
 &&
 
 .OTX WATCHES/WARNINGS/ADVISORIES...
 ID...NONE.
 WA...NONE.
 &&
 
 

 
 
 
 
 

Webmaster
US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Eureka Weather Forecast Office
300 Startare Drive
Eureka, California 95501

Tel: (707) 443-6484