Red Flag Warning 14, NWS Grand Junction, CO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
418 AM MDT SUN JUL 8 2007

.SHORT TERM (TODAY THROUGH MONDAY NIGHT)...
SHORTWAVE TROF PUSHING ACROSS THE THE NORTHERN ROCKIES EARLY THIS
MORNING. AS A RESULT...RIDGE WHICH HAS DOMINATED CONDITIONS ACROSS
THE REGION HAS BEEN FLATTENED.

MODEL GUIDANCE INDICATED THAT TROF PASSAGE WILL HAVE LITTLE EFFECT
ON SENSIBLE WEATHER TODAY...ASIDE FROM CHANGING THE DIRECTION OF
PROPAGATION OF AFTERNOON/EVENING THUNDERSTORMS. ALSO EXPECT A SLIGHT
DIP IN TEMPERATURES NORTH OF THE I-70 CORRIDOR. OTHERWISE...
CONDITIONS SIMILAR TO YESTERDAY WITH SUFFICIENT MID-LEVEL MOISTURE
TO GENERATE ISOLATED TO SCATTERED HIGH-BASED THUNDERSTORMS.

DIURNAL COOLING AND ADVECTION OF DRIER AIR FROM THE WEST WILL BRING
AN END TO THUNDERSTORMS BEFORE MIDNIGHT. DRYING TREND TO CONTINUE
INTO MONDAY RESULTING IN REDUCED CONVECTIVE ACTIVITY...CONFINED
MAINLY TO HIGHER TERRAIN ALONG THE CONTINENTAL DIVIDE.

AFTERNOON HIGHS TODAY NEAR PERSISTENCE EXCEPT NORTH AS MENTIONED
ABOVE. WARMER ON MONDAY WITH LESS MOIST CONVECTION ANTICIPATED. LIKE
YESTERDAY...FELT MAV GUIDANCE TOO WARM GIVEN AMOUNT OF THUNDERSTORM
ACTIVITY EXPECTED TODAY...BUT BETTER MONDAY UNDER DRIER REGIME.

.LONG TERM...TUESDAY THROUGH SATURDAY...
BROAD RIDGE CONTINUES TO BE ANCHORED OVER THE WESTERN US THROUGH THE
EXTENDED PERIOD. THE 00Z GFS IS PULLING MORE MOISTURE INTO THE RIDGE.
THIS SEEMS LOGICAL WITH THE SIERRA MADRE MOUNTAINS OF NW MEXICO
CURRENTLY GETTING ACTIVE...A PRECURSOR TO THE SEASONAL MOISTURE
SURGE. WEAK FRONT-PLAINS COOL FRONT BACKDOORS TUESDAY NIGHT AND MAY
ADVECT IN MOISTURE FROM THE SOUTH AND PLAINS. THEREFORE HAVE RAISED
LATE-DAY POPS TO SCATTERED CATEGORY OVER THE HIGHER MTNS AND LOWERED
DIURNAL TEMP SPREAD A FEW DEGREES.

&&

.AVIATION...
OUTFLOW THUNDERSTORM WINDS WILL BE THE PRIMARY AVIATION HAZARD
THIS AFTERNOON AND EVENING UNTIL ABOUT 03Z. ERRATIC GUSTS TO 35
KNOTS WILL BE COMMON WITH THUNDERSTORMS. VFR CONDITIONS WILL
CONTINUE BUT NARROW RAIN SHAFTS MAY BRIEFLY OBSCURE THE HIGHER
MOUNTAIN TERRAIN...ESPECIALLY OVER THE COLORADO ROCKIES.

&&

.FIRE WEATHER...
A RED FLAG WARNING HAS BEEN RAISED AGAIN TODAY. WIDELY SCATTERED
DRY LIGHTNING REMAINS THE PRIMARY CONCERN...THOUGH HOT TEMPERATURES
...EXTREMELY DRY FUELS AND GUSTY OUTFLOW WINDS WILL ALSO CONTRIBUTE
TO CRITICAL FIRE WEATHER CONDITIONS. IN ADDITION...LOCAL AREAS WILL
BE QUITE DRY WITH MINIMUM RELATIVE HUMIDITY VALUES BELOW 15 PERCENT.
AS ON PREVIOUS DAYS...SOME STORMS MAY PRODUCE WETTING RAINS...HOWEVER
THEY ARE UNLIKELY TO SIGNIFICANTLY DIMINISH THE PROBABILITY OF FIRE
STARTS DUE TO NARROW RAIN SHAFTS AND UNUSUALLY DRY FUELS.

&&

.GJT WATCHES/WARNINGS/ADVISORIES...
.CO...RED FLAG WARNING FROM NOON UNTIL 10 PM MDT FOR ALL FIRE WEATHER
          ZONES (201...203...205...207) IN WESTERN COLORADO.
.UT...RED FLAG WARNING FROM NOON UNTIL 10 PM MDT FOR NORTHEAST UTAH
          (FIRE WEATHER ZONES 442...443...444).

SHORT TERM...NL
LONG TERM...JOE
FIRE WEATHER...EH/NL
AVIATION...PF

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