Area Forecast Discussion
Issued by NWS Grand Junction, CO

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000
FXUS65 KGJT 202325
AFDGJT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
425 PM MST THU NOV 20 2014

.SHORT TERM...(TONIGHT THROUGH FRIDAY NIGHT)
ISSUED AT 326 PM MST THU NOV 20 2014

WEAK TROUGH WAS MOVING ACROSS THE FORECAST AREA THIS AFTERNOON WITH
EXTENSIVE CLOUDINESS...THOUGH SOME CLEARING IS WORKING INTO SE
UT. WITH SOME ECHOES ON THE KGJX RADAR...SOME VIRGA OR ISOLATED
LIGHT INSTABILITY SNOW SHOWERS OVER THE HIGHER TERRAIN IS NOT OUT
OF THE QUESTION. THIS WILL PERSIST THROUGH EVENING BEFORE
DIMINISHING AS THE TROUGH/DEFORMATION AXIS EXITS TO THE EAST AFTER
MIDNIGHT.

SATELLITE IMAGES SHOW THE NEXT STORM SYSTEM MOVING INTO NRN CALIF.
THIS SYSTEM IS EXPECTED TO DIVE SOUTHEAST ON FRI. MAY SEE SOME
ISOLATED LIGHT SNOW SHOWERS OVER THE SAN JUAN/ABAJO/LA SAL MTNS
FRI AFTERNOON IN DIFLUENT FLOW NORTHEAST OF THE UPPER TROUGH.
OTHERWISE...PARTLY TO MOSTLY CLOUDY CONDITIONS FOR FRI AFTERNOON
WITH LITTLE CHANGE IN TEMPS.

.LONG TERM...(SATURDAY THROUGH THURSDAY)
ISSUED AT 326 PM MST THU NOV 20 2014

NW PACIFIC MOISTURE IS STILL ON TRACK TO REACH THE FORECAST AREA
ON SATURDAY AFTERNOON...BRINGING THE NEXT WINTER SYSTEM INTO THE
REGION. ISSUED SOME WINTER WX WATCHES TODAY OVER NW COLORADO TO
COVER THE HIGHEST CONFIDENCE AREAS FOR HEAVY SNOW ON SATURDAY
AFTERNOON THROUGH SUNDAY AFTERNOON. THE COLD FRONT IS STILL
EXPECTED TO PASS FROM NORTHWEST TO SOUTHWEST ON SATURDAY NIGHT.
OTHER DETAILS ARE A BIT DIFFERENT TODAY ON THIS STORM...WITH THE
SPEC HUMIDITY FIELDS ON BOTH THE GFS AND NAM NOW INDICIATING THE
BULK OF THE MOISTURE BEING CONTAINED TO SATURDAY NIGHT...THEN MORE
QUICKLY DECREASING BY SUNDAY AFTERNOON BEHIND THE COLD FRONT
PASSAGE. THE JET MAXIMUM ALSO STAYS A BIT FURTHER TO THE SOUTH YET
H5 VORT FIELDS SUGGEST THE NORTH AND CENTRAL MTNS ARE STILL THE
FAVORED SPOT. MODELS ARE LESS ENTHUSED TODAY TO ALLOW SNOW IN THE
GRAND VALLEY...BUT THE POSSIBILITY OF A TRACE OF SNOW IS NOT OUT
OF THE QUESTION WITH THE NIGHTTIME TIMING OF THE PRECIP. CONCERNED
THE VALLEY WILL BECOME SHADOWED AS WINDS BECOME NORTHWEST BEHIND
THE FRONT.

WE ARE EXPECTING A BREAK IN THE PRECIPITATION SUNDAY EVENING
BEFORE ANOTHER DISTURBANCE REACHES WESTERN COLORADO AGAIN ON
MONDAY MORNING DRIVEN BY A JET MAXIMUM. THE MODEL SOLUTIONS
DIVERGE MONDAY NIGHT SO THERE IS LOW CONFIDENCE ON THE EXTENDED
PAST THIS TIMEFRAME. THE LONG TERM BLEND DOES REFLECT THE
POTENTIAL OF A STORM BARRELING INTO WESTERN COLORADO FOR
THANKSGIVING DAY NEXT WEEK...THOUGH THE GFS IS COMPLETELY OUT OF
PHASE WITH THE EC AND KEEPS DRY HIGH PRESSURE OVERHEAD FOR THE
HOLIDAY. CANNOT RULE OUT THE POSSIBILITY OF A STORM NEXT
THURSDAY...BUT CONFIDENCE IS TOO LOW TO GET EXCITED AT THIS POINT.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z FRIDAY EVENING)
ISSUED AT 420 PM MST THU NOV 20 2014

WIDESPREAD CLOUDS CONTINUE TO MOVE ACROSS UTAH AND COLORADO THIS
EVENING THOUGH ALL TAF SITES REMAIN AND ARE EXPECTED TO REMAIN
VFR. HIGHER MTNS WILL SEE OBSCURATIONS AND CIGS NEAR 3K FT FROM
TIME TO TIME OVERNIGHT. A BREAK IN THE CLOUDS WILL OCCUR FRIDAY
MORNING BEFORE ANOTHER ROUND OF HIGH CLOUDS MOVES IN. VFR WILL
CONTINUE HOWEVER.

&&

.GJT WATCHES/WARNINGS/ADVISORIES...
CO...WINTER STORM WATCH FROM SATURDAY AFTERNOON THROUGH SUNDAY
     AFTERNOON FOR COZ004-005-009-010-012-013.

     WINTER STORM WATCH FROM SATURDAY AFTERNOON THROUGH SUNDAY
     MORNING FOR COZ002.

UT...NONE.
&&

$$

SHORT TERM...JAD
LONG TERM...JAM
AVIATION...TGR



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