FNUS75 KCYS 051335
FWSCYS

SPOT FORECAST FOR PRAIRIE RX...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE CHEYENNE WY
734 AM MDT THU MAY 5 2011

FORECAST IS BASED ON IGNITION TIME OF 0930 MDT ON MAY 05.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
NO SIGNIFICANT CONCERNS TODAY THROUGH FRIDAY WITH STABLE AND DRY
CONDITIONS EXPECTED WITH AN UPPER LEVEL RIDGE OVER THE BURN SITE.
EXPECT WINDS TO INCREASE AROUND 11 AM MDT THIS MORNING AND BECOME
MORE FROM THE NORTHWEST. MINIMUM RELATIVE HUMIDITY VALUES WILL
DROP INTO THE LOWER 20 PERCENT RANGE. FAIR HUMIDITY RECOVERIES
ARE EXPECTED OVERNIGHT AT THE BURN SITE...BUT NOT QUITE AS GOOD
AS THOSE OBSERVED WEDNESDAY NIGHT.

.TODAY...

SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....64 TO 69.
MIN HUMIDITY........21 TO 25 PERCENT.
WIND (20 FT)........UPSLOPE 5-9 MPH...INCREASING TO
                    NORTHWEST 8 TO 12 WITH GUSTS TO 16 AFTER
                    11 AM MDT.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4000 FT AGL INCREASING TO 7800 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....WEST AROUND 11 MPH.
SMOKE DISPERSAL.....GOOD TO EXCELLENT (39900-85500 KNOT-FT).

.TONIGHT...

SKY/WEATHER.........CLEAR (0-10 PERCENT) THEN BECOMING PARTLY
                    CLOUDY (30-40 PERCENT) AFTER 3 AM MDT.
MIN TEMPERATURE.....36 TO 41.
MAX HUMIDITY........62 TO 76 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 8 TO 12 MPH...BECOMING
                    DOWNSLOPE 3 TO 6 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......4000 FT AGL DECREASING TO 100 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST AROUND 14 MPH.
SMOKE DISPERSAL.....POOR TO GOOD (1600-59200 KNOT-FT).

.FRIDAY...

SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT)...ISOLATED
                    RAIN SHOWERS AFTER 2 PM MDT.
MAX TEMPERATURE.....AROUND 67.
MIN HUMIDITY........28 PERCENT.
WIND (20 FT)........DOWNSLOPE 3 TO 6...BECOMING NORTHWEST
                    8 TO 13 MPH WITH GUSTS TO 24 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......4400 FT AGL INCREASING TO 8700 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....NORTHWEST AROUND 20 MPH.
SMOKE DISPERSAL.....GOOD TO EXCELLENT (52700-181800 KNOT-FT).

$$
FORECASTER...CARPENTER
REQUESTED BY...KENN PERREAULT
TYPE OF REQUEST...PRESCRIBED
.TAG 20110505.PRAIR.02/CYS