FNUS75 KGJT 181504
FWSGJT

SPOT FORECAST FOR MATHESON PRESERVE RX...GJ INTERAGENCY DISPATCH
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
904 AM MDT THU OCT 18 2012

FORECAST IS BASED ON IGNITION TIME OF 1200 MDT ON OCTOBER 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION... DRY NORTHWEST FLOW ALOFT WILL CONTINUE TODAY. VALLEY
INVERSION FROM COLD AIR POOLING IN THE VALLEY LAST NIGHT WILL BE
SLOW TO ERODE...HOWEVER....LIMITING VERTICAL MIXING THIS AFTERNOON
AND KEEPING THE CLEARING INDEX BELOW 500. ALSO...SIMILAR TO
YESTERDAY...SURFACE WINDS WILL BE BE MAINLY TERRAIN DRIVEN WITH
ONLY PERIODS OF NORTHWEST WINDS AS FLOW ALOFT MIXES DOWN AT TIMES
THIS AFTERNOON. NOT TOO MUCH CHANGE IS EXPECTED FOR FRIDAY AS HIGH
PRESSURE REMAINS AND STABLE CONDITIONS PERSIST. . MIXING HEIGHTS
WILL BE A LITTLE HIGHER ON FRIDAY DUE TO WARMER TEMPERATURES...BUT
THIS WILL BE COUNTERACTED BY A WEAKENING IN TRANSPORT WINDS.

.TODAY...

SKY/WEATHER.........SUNNY (0-10%).
MAX TEMPERATURE.....67-70 F.
MIN HUMIDITY........8-13%.
20-FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 2-4 MPH UNTIL 1000...THEN
                    LIGHT AND VARIABLE BECOMING UPSLOPE/UPVALLEY 5 MPH
                    BY 1300.
CLEARING INDEX......INCREASING TO 150 AT 1200...THEN 350 BY 1400...
                    DECREASING TO 250 BY 1700.
HAINES INDEX........3 VERY LOW.
MIXING HEIGHT.......300-700 FT AGL INCREASING TO 5100 FT AGL BY 1400
                    BEFORE LOWERING TO 4000 FT AGL BY 1500.
TRANSPORT WINDS.....DOWNSLOPE/DOWNVALLEY 2-4 MPH UNTIL 1000...THEN
                    SHIFTING TO THEN NORTHWEST 10 MPH BY 1400.

.TONIGHT...

SKY/WEATHER.........CLEAR (0-10%).
MIN TEMPERATURE.....39-44 F.
MAX HUMIDITY........25-30%.
20-FOOT WINDS.......DOWNSLOPE/DOWSNVALLEY 2-5 MPH.
CLEARING INDEX......DECREASING TO 50 BY 2100.
HAINES INDEX........3 VERY LOW.
MIXING HEIGHT.......2100 LOWERING TO 200 FT AGL BY 2100.
TRANSPORT WINDS.....DOWNSLOPE/DOWNVALLEY 2-5 MPH.

.FRIDAY...

SKY/WEATHER.........SUNNY (0-10%).
MAX TEMPERATURE.....70-74 F.
MIN HUMIDITY........10-15%.
20-FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 2-4 MPH UNTIL 1000...THEN
                    LIGHT AND VARIABLE BECOMING SOUTHWEST 5 MPH
                    BY 1300.
CLEARING INDEX......INCREASING TO 150 AT 1200...THEN 300 BY 1400.
HAINES INDEX........4 LOW.
MIXING HEIGHT.......200-400 FT AGL INCREASING TO 5500 FT AGL BY 1400.
TRANSPORT WINDS.....DOWNSLOPE 2-4 MPH SHIFTING TO THE SOUTHWEST 6 MPH
                    IN THE AFTERNOON.

$$
FORECASTER...JIM DANIELS
REQUESTED BY...JOSH RELPH
TYPE OF REQUEST...PRESCRIBED
.TAG 20121018.MATHE.01/GJT