Area Forecast Discussion
Issued by NWS Grand Junction, CO

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FXUS65 KGJT 201700
AFDGJT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1100 AM MDT MON OCT 20 2014

.SHORT TERM...(TODAY THROUGH TUESDAY)
ISSUED AT 242 AM MDT MON OCT 20 2014

CLOUDS AND SHOWERS HAVE DISSIPATED OVERNIGHT GIVING WAY TO MOSTLY
CLEAR SKIES. HOWEVER...THE LOW PRESSURE...OR OPEN WAVE DEPENDING
ON WHICH MODEL BEING LOOKED AT...REMAINS TO OUR SOUTH AND WILL
ALLOW SOME MOISTURE TO ADVECT INTO THE REGION. THE END RESULT WILL
BE VERY SIMILAR TO YESTERDAY WITH SHOWERS AND THUNDERSTORMS ONCE
AGAIN FAVORING THE SAN JUANS AND CENTRAL MOUNTAINS FROM NOON
THROUGH EVENING HOURS. PLENTY OF SUNNY SKIES OUTSIDE OF THIS
PRECIP WITH TEMPS REMAINING WARM THOUGH THIS CHANGES TOMORROW.

FOR THIS EVENING...THUNDERSTORMS WILL BE LIMITED MAINLY TO THE
COLORADO SOUTHERN AND CENTRAL MTNS. BUT IN RESPONSE TO THE TROUGH
WORKING INTO NEVADA...STRENGTHENING SE GRADIENT WINDS ACROSS THE
SOUTH WILL BRING MOISTURE ADVECTION WITH STORMS AND SHOWERS
INCREASING IN SE UT AND SW CO BY MIDNIGHT AND BEYOND.

TUESDAY THE NAM IS DEEPER WITH THE TROUGH BUT ALL MODELS BEGIN TO
LIFT THE BEST FORCING TO THE NE ACROSS IDAHO. THIS WOULD GENERALLY
LIMIT SHOWERS IN THIS FORECAST AREA BUT FOR THE DEEP MOISTURE OVER
THE REGION. PRECIPITABLE WATER VALUES RISE TO OVER 0.9 INCHES
WHICH IS IMPRESSIVE FOR LATE OCTOBER. SHOWERS WILL SPREAD ACROSS
THE FORECAST AREA WITH THE BEST RAINFALL EXPECTED ALONG SOUTH-
FACING SLOPES. CLOUDY SKIES WILL LIMIT INSTABILITY FOR ISOLATED
EMBEDDED THUNDERSTORMS EXPECTED WITHIN WIDESPREAD SHOWERS. SNOW
LEVELS REMAIN HIGH WITH 700MB TEMPS AT 5C OR WARMER. STILL
CONVECTION WILL DRIVE SNOW FLAKES LOWER TO AROUND 10KFT BUT WITH
LITTLE SURVIVABLE ACCUMULATION. BREEZY SE-SW WINDS EXPECTED WITH
SHOWERS.

.LONG TERM...(TUESDAY NIGHT THROUGH SUNDAY)
ISSUED AT 242 AM MDT MON OCT 20 2014

THE TROUGH LIFTS NE THROUGH WYOMING-MONTANA WITH THE ENTRANCE TAIL
OF THE 50KT JET DRAGGING ACROSS THE NORTH OVERNIGHT. THIS BRINGS
COLD ADVECTION AND A SFC FRONT ACROSS THE REGION OVERNIGHT INTO
WEDNESDAY MORNING FOR THE BEST CHANCE OF SHOWERS AND STORMS. SNOW
LEVEL WILL DROP TO AROUND 8500-9500FT OVERNIGHT BUT RISES AGAIN ON
WEDNESDAY. DRIER AIR BEGINS TO WORK INTO NE UTAH ON WEDNESDAY THAT
ENDS SHOWERS FROM WEST TO EAST THROUGH THE DAY. THE LAST SHOWERS
END BY MIDNIGHT ALONG THE CONTINENTAL DIVIDE. SNOW ACCUMULATIONS
OF UP TO 6 INCHES ARE EXPECTED OVER THE HIGHER COLORADO MTNS. WITH
CLEARING SKIES A COOL NIGHT IS EXPECTED WEDNESDAY NIGHT.

BENIGN WEATHER SETS UP THURSDAY AND CONTINUES INTO THE WEEKEND AS
HIGH PRESSURE BUILDS IN. THE JET STREAM WILL TAKE AIM AT THE PAC
NW DURING THE PERIOD AND WILL SHUNT THE RIDGE AXIS TO THE PLAINS
WHILE WE STAY UNDER SW FLOW KEEPING TEMPS ABOVE AVERAGE. A DEEP
TROUGH COMES ASHORE SATURDAY AND LOOKS TO MOVE ACROSS THE CWA
SUNDAY BRINGING SOME PRECIP FOR MAINLY THE NRN HALF OF THE AREA.
EC AND GFS IN FAIRLY GOOD AGREEMENT BUT WITH THIS EVENT SO FAR
OUT...DO EXPECT SOME CHANGES IN THE COMING DAYS.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON)
ISSUED AT 1100 AM MDT MON OCT 20 2014

EXPECT VFR CONDITIONS TO CONTINUE AT TAF SITES THROUGH THE NEXT 24
HOURS. HOWEVER...THERE WILL BE SCATTERED SHOWERS AND A FEW
THUNDERSTORMS OVER THE CENTRAL AND SOUTHERN MOUNTAINS THIS
AFTERNOON AND EVENING. THIS ACTIVITY WILL RESULT IN LOCALIZED
MOUNTAIN OBSCURATION AND GUSTY OUTFLOW WINDS. THERE IS A 20 TO 30
PERCENT CHANCE THAT THIS ACTIVITY COULD IMPACT TAF SITES LATE THIS
AFTERNOON THROUGH 04Z/TUES...THOUGH FLIGHT RULES SHOULD REMAIN
VISUAL.

&&

.GJT WATCHES/WARNINGS/ADVISORIES...

CO...NONE.
UT...NONE.

&&

$$

SHORT TERM...TGR/JOE
LONG TERM...JOE/TGR
AVIATION...NL


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