Area Forecast Discussion
Issued by NWS Grand Junction, CO

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000
FXUS65 KGJT 032100
AFDGJT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
300 PM MDT THU SEP 3 2015

.SHORT TERM...(TONIGHT THROUGH FRIDAY NIGHT)
ISSUED AT 300 PM MDT THU SEP 3 2015

A DISTURBANCE HAS LIFTED NE THROUGH THE DAY...INTO NW COLORADO
THIS AFTERNOON. STORMS WILL FAVOR THE YAMPA RIVER BASIN AND
ELKHEAD/PARK/GORE/FLAT TOP RANGES THIS LATE AFTERNOON. ELSEWHERE
GOOD MOISTURE AND MARGINAL INSTABILITY WILL KEEP MAINLY HIGHER
TERRAIN STORMS GOING UNTIL SUNSET. THERE WILL BE A CONVECTIVE
BREAK THROUGH MUCH OF THE NIGHT TONIGHT. AFTER MIDNIGHT THE NEXT
DISTURBANCE WILL PUSH INTO THE FOUR CORNERS. CHANCES OF STORMS
WILL BE ON THE INCREASE ACROSS THE SOUTH IN THE EARLY MORNING
HOURS. PRECIPITABLE WATER VALUES REACH A MAXIMUM TOWARDS MORNING
WITH THIS SURGE...1.2 INCHES ACROSS SE UTAH.

THE ABOVE MENTIONED DISTURBANCE WILL TRACK NORTH-NORTHEAST ON
FRIDAY WITH AN UPTICK IN SHOWERS AND THUNDERSTORMS SPREADING
NORTHWARD THROUGH THE DAY. THIS ACTIVITY WILL BE ENHANCED BY THE
DIURNAL EFFECTS DURING THE AFTERNOON...AND AS MOISTURE LEVELS
INCREASE THROUGH THE DAY. ALSO A JET STREAK OVERHEAD WILL PROVIDE
SOME UPPER LEVEL SUPPORT...ALBEIT ON THE WEAK SIDE. IN ANY CASE
FRI PROMISES TO BE THE MOST PRODUCTIVE AND WETTEST DAY FOR THIS
LATEST SUB-TROPICAL MOISTURE SURGE. ACTIVITY WILL DIMINISH FROM
THE WEST DURING THE EVENING. HOWEVER...EXPECT SOME NOCTURNAL
STORMS TO PERSIST OVERNIGHT.

DUE TO THE INCREASED CLOUDS/PRECIPITATION...DAYTIME HIGHS WILL
RUN A LITTLE BELOW NORMAL...WITH NIGHTTIME LOWS A LITTLE ABOVE
NORMAL.

.LONG TERM...(SATURDAY THROUGH THURSDAY)
ISSUED AT 300 PM MDT THU SEP 3 2015

A SLOW DRYING TREND WILL DEVELOP BY EARLY SAT...WITH A DOWNTURN IN
SHOWERS AND THUNDERSTORMS EXPECTED. MODELS SHOW PRECIPITABLE
WATER VALUES (PW) WILL RANGE FROM 0.75 TO 1+ INCH SAT
MORNING...AND THEN WILL SLOWLY DECREASE LATE IN THE DAY. THERE
WILL STILL BE PRETTY GOOD COVERAGE OF STORMS DURING THE AFTERNOON
WITH THE AID OF DAYTIME HEATING. BUT BOTH COVERAGE AND INTENSITY
WILL SEE A DOWNTURN AS COMPARED TO FRI. TEMPERATURES WILL REMAIN
BELOW NORMAL.

THE DRYING TREND WILL STRENGTHEN SAT NIGHT AND SUN. AS A
RESULT...MOST CONVECTIVE ACTIVITY WILL END BY MIDNIGHT SAT NIGHT.
BY SUN AFTERNOON MODELS INDICATE THAT PW WILL HAVE FALLEN TO 0.25
INCH ACROSS MUCH OF THE FORECAST AREA WITH AS MUCH AS 0.5 INCH
LINGERING OVER THE FOUR CORNERS. WHILE SKIES WILL BE SUNNY TO
MOSTLY SUNNY...TEMPERATURES WILL REMAIN ON THE COOL SIDE...AND
SHOWERS AND THUNDERSTORMS WILL HAVE A HARD TIME DEVELOPING EVEN IN
THE AFTERNOON.

THEN A LITTLE MOISTURE WILL CREEP ACROSS THE SOUTHERN BORDER
EARLY IN THE WORK WEEK...BUT MOST OF THE AREA WILL REMAIN QUITE
DRY. THIS MODEST SOUTHERLY MOISTURE WILL BRING A CHANCE OF SHOWERS
AND THUNDERSTORMS TO THE SAN JUANS MOUNTAINS EACH AFTERNOON...BUT
THE REMAINDER OF THE AREA SHOULD REMAIN DRY. TEMPERATURES WILL BE
NEAR NORMAL.



&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z FRIDAY NOON)
ISSUED AT 1140 AM MDT THU SEP 3 2015

A BAND OF STORMS AND SHOWERS OVER THE COLORADO I-70 CORRIDOR WILL
LIFT NE THROUGH THE AFTERNOON WITH CIGS BLO ILS BREAK POINTS KEGE
AND KASE. ELSEWHERE SCT -SHRA/-TSRA WILL FORM OVER HIGHER TERRAIN
AND MOVE NE AT 15KTS. THROUGH 03Z THESE STORMS WILL THREATEN WIND
GUSTS TO 35KTS...CIGS BLO 050...VIS BLO 6SM IN STRONGER STORMS.
AFT 09Z SCT -SHRA/-TSRA WILL THREATEN KDRO KTEX.


&&

.GJT WATCHES/WARNINGS/ADVISORIES...
CO...NONE.
UT...NONE.
&&

$$

SHORT TERM...JOE/EH
LONG TERM...EH
AVIATION...JOE



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