FNUS75 KTFX 181518
FWSTFX

SPOT FORECAST FOR HOPLEY UNITS...USFS
NATIONAL WEATHER SERVICE GREAT FALLS MT
918 AM MDT MON MAY 18 2009

FORECAST IS BASED ON IGNITION TIME OF 0910 MDT ON MAY 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A WARM AND DRY AIRMASS WILL REMAIN IN PLACE OVER CENTRAL MONTANA
TODAY. DAYTIME HEATING WILL ALLOW THE AIRMASS TO BECOME SLIGHTLY
UNSTABLE THIS AFTERNOON AND EVENING WHICH MAY ALLOW FOR THE DEVELOPMENT
OF AN ISOLATED LATE AFTERNOON OR EVENING THUNDERSTORM. OTHER THAN
IN THE VICINITY OF ANY THUNDERSTORM ACTIVITY...WINDS WILL LIKELY BE
LIGHT AND SLOPE DRIVEN THROUGH EARLY THIS AFTERNOON...THEN INCREASE
FROM THE SOUTHWEST IN THE LATE AFTERNOON INTO THE EARLY EVENING.
STRONGER WINDS AND A BETTER CHANCE FOR THUNDERSTORMS WILL OCCUR ON
TUESDAY AS A COLD FRONT APPROACHES THE REGION FROM THE WEST. HOENISCH

.TODAY...

SKY/WEATHER.........MOSTLY SUNNY...THEN BECOMING PARTLY CLOUDY IN THE
                    AFTERNOON WITH AN ISOLATED THUNDERSTORM POSSIBLE.
CWR.................5 PERCENT.
MAX TEMPERATURE.....71-76.
MIN HUMIDITY........17-22 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 4 TO 8 MPH. GUSTS UP TO 15 MPH
                    LATE IN THE AFTERNOON.
RIDGE TOP WIND......SOUTHWEST 10 TO 15 MPH...GUSTS TO AROUND 20 MPH
                    LATE IN THE AFTERNOON.
MIXING HEIGHT.......8000 FT AGL.
MIXING WINDS........WEST AROUND 15 MPH.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY. AN ISOLATED THUNDERSTORM POSSIBLE
                    IN THE EVENING.
CWR.................10 PERCENT.
MIN TEMPERATURE.....43-48.
MAX HUMIDITY........75-80 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 10 MPH. GUSTS TO 15 MPH
                    POSSIBLE IN THE EVENING.
RIDGE TOP WIND......SOUTHWEST WINDS 10 TO 15 MPH.
MIXING HEIGHT.......LESS THAN 1000 FT AGL.
MIXING WINDS........SOUTHWEST WINDS AROUND 15 MPH.

.TUESDAY...

SKY/WEATHER.........PARTLY SUNNY. CHANCE SHOWERS AND THUNDERSTORMS
                    IN THE AFTERNOON.
CWR.................20 PERCENT.
MAX TEMPERATURE.....74-79.
MIN HUMIDITY........15-20 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 10 MPH....INCREASING TO 10
                    TO 15 MPH IN THE AFTERNOON.
RIDGE TOP WIND......SOUTHWEST WINDS 10 TO 15 MPH....INCREASING TO 15
                    TO 20 MPH IN THE AFTERNOON.
MIXING HEIGHT.......8000 FT AGL.
MIXING WINDS........SOUTHWEST AROUND 25 MPH.

$$
FORECASTER...HOENISCH
REQUESTED BY...MATT PLAGENZ
TYPE OF REQUEST...PRESCRIBED
.TAG 20090518.HOPLE.02/TFX