FNUS75 KGJT 070049
FWSGJT

SPOT FORECAST FOR POWDERHORN...BLM
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
649 PM MDT WED MAY 6 2009

FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON MAY 07.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A DRY WESTERLY FLOW WILL STRENGTHEN ON THURSDAY AS ENERGY MOVES
ACROSS THE NORTHERN TIER STATES. WESTERLY WINDS ARE EXPECTED TO
MIX DOWN TO THE SURFACE BY THE AFTERNOON...WITH BREEZY CONDITIONS
DEVELOPING. MIXING WILL QUICKLY SUBSIDE AS THE SUN SETS AND THE
SURFACE LAYER DECOUPLES FROM THE FLOW ALOFT.

.THURSDAY (UNTIL SUNSET)...

SKY/WEATHER.........MOSTLY SUNNY (10-20%).
MAX TEMPERATURE.....66-71 F.
MIN HUMIDITY........15-20%.
20-FOOT WINDS.......DOWNSLOPE/DOWN VALLEY 3-6 MPH UNTIL 1000...
                    THEN BECOMING UPSLOPE/UPVALLEY. AFTER 1200
                    WINDS WILL BECOME WEST AND INCREASE TO
                    TO 12-18 MPH BY 1300 WITH GUSTS 35-40 MPH
                    LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....BECOMING EXCELLENT BY 1300.
HAINES INDEX........4 LOW.
MIXING HEIGHT.......10000 FT AGL.
TRANSPORT WINDS.....WEST 33 MPH.

.THURSDAY NIGHT (AFTER SUNSET)...

SKY/WEATHER.........MOSTLY CLEAR (20-30%).
MIN TEMPERATURE.....35-40 F.
MAX HUMIDITY........45-50%.
20-FOOT WINDS.......WEST 8-12 MPH WITH GUSTS TO AROUND 20 MPH
                    QUICKLY DIMINISHING BY 2100 AND
                    BECOMING DOWNSLOPE/DOWNVALLEY 3-6 MPH.
SMOKE DISPERSAL.....POOR (5000 KNOT-FT AFTER 2100).
MIXING HEIGHT.......1000 FT AGL.
TRANSPORT WINDS.....WEST 20 MPH UNTIL 2100...THEN BECOMING
                    DOWNSLOPE/DOWNVALLEY 6 MPH.

$$
FORECASTER...ELLEN HEFFERNAN
REQUESTED BY...BRIAN STEVENS
TYPE OF REQUEST...PRESCRIBED
.TAG 20090507.POWDE.01/GJT