FNUS75 KCYS 271953
FWSCYS

SPOT FORECAST FOR WYOFIRE...WY STATE FORESTRY
NATIONAL WEATHER SERVICE CHEYENNE WY
153 PM MDT WED MAY 27 2009

FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON MAY 30.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
LIGHT WINDS AND ABOVE NORMAL TEMPERATURES WILL BE PRESENT AT
THE WYOFIRE SITE FRIDAY NIGHT AND SATURDAY. A WEAK STORM SYSTEM
WILL CREATE A SLIGHT CHANCE FOR THUNDERSTORMS SATURDAY AFTERNOON.
MINIMUM RELATIVE HUMIDITY VALUES WILL DROP TO AROUND 20 PERCENT
SATURDAY. SUNDAY WILL ALSO BE QUITE WARM WITH ABOVE NORMAL
TEMPERATURES EXPECTED...AND ANOTHER SLIGHT CHANCE OF AFTERNOON
THUNDERSTORMS AT THE BURN SITE.

.FRIDAY NIGHT...

SKY/WEATHER.........MOSTLY CLOUDY (65-70 PERCENT).
MIN TEMPERATURE.....45 TO 48.
MAX HUMIDITY........73 TO 77 PERCENT.
WIND (20 FT)........NORTHWEST 3 TO 6 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 8 MPH.
SMOKE DISPERSAL.....POOR (AROUND 2300 KNOT-FT).

.SATURDAY...

SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT) BECOMING
                    MOSTLY CLOUDY (65-70 PERCENT) WITH
                    ISOLATED SHOWERS AND THUNDERSTORMS IN THE
                    AFTERNOON.
MAX TEMPERATURE.....80 TO 82.
MIN HUMIDITY........19 TO 25 PERCENT.
WIND (20 FT)........NORTHEAST 5 TO 9 MPH.
CWR.................0 PERCENT INCREASING TO 10 PERCENT IN THE
                    AFTERNOON.
LAL.................2.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......5000 FT AGL INCREASING TO 9000 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....NORTHEAST AROUND 8 MPH.
SMOKE DISPERSAL.....POOR BECOMING EXCELLENT (500-11400 KNOT-FT).


.SATURDAY NIGHT...
MOSTLY CLOUDY WITH A 20 PERCENT CHANCE OF THUNDERSTORMS. SOUTH
WINDS AT 5 TO 15 MPH...BECOMING WEST-NORTHWEST AROUND SUNRISE
SUNDAY MORNING. STRONGER GUSTS NEAR THUNDERSTORMS. LOW
TEMPERATURES 49 TO 52. MAXIMUM RELATIVE HUMIDITIES 78 TO 82
PERCENT.

.SUNDAY...
MOSTLY CLOUDY AND SLIGHTLY COOLER WITH A 20 PERCENT CHANCE OF
THUNDERSTORMS. NORTHWEST WINDS AT 5 TO 15 MPH...BECOMING
NORTHEAST BY AROUND NOON. STRONGER GUSTS NEAR THUNDERSTORMS.
HIGH TEMPERATURES 75 TO 80. MINIMUM RELATIVE HUMIDITIES 28
TO 32 PERCENT.

$$
FORECASTER...CARPENTER
REQUESTED BY...M  BOURNAZIAN
TYPE OF REQUEST...PRESCRIBED
.TAG 20090530.WYOFI.01/CYS