FNUS75 KTFX 201609
FWSTFX

SPOT FORECAST FOR DEEP CREEK RX...HNF
NATIONAL WEATHER SERVICE GREAT FALLS MT
1009 AM MDT TUE APR 20 2010

FORECAST IS BASED ON IGNITION TIME OF 1010 MDT ON APRIL 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

AN AREA OF LOW PRESSURE WILL TRACK INTO THE GREAT BASIN ON WEDNESDAY
WITH EAST TO SOUTHEAST WINDS ACROSS MUCH OF CENTRAL MONTANA ON
THE NORTH SIDE OF THE CIRCULATION. THE AIRMASS WILL BECOME UNSTABLE
WEDNESDAY AFTERNOON AND EVENING FOR A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS...HOWEVER AFTERNOON RELATIVE HUMIDITIES SHOULD DROP
DOWN BELOW 30% BEFORE THE CLOUD-COVER INCREASES. WINDS WILL BE
DRIVEN BY THE TERRAIN AND SLOPE-HEATING AT MID TO LOWER SLOPES
WITH WITH AN EASTERLY FLOW EXPECTED THROUGH MUCH OF DEEP DEEP
CREEK CANYON. UPPER LEVEL RIDGE TOP WINDS WILL BE SOMEWHAT BREEZY
AND FROM THE EAST TO SOUTHEAST. HOENISCH

.WEDNESDAY...

SKY/WEATHER.........PARTLY SUNNY. SLIGHT CHANCE OF A SHOWER OR
                    THUNDERSTORM IN THE AFTERNOON AND EVENING.
CWR.................10 PERCENT.
MAX TEMPERATURE.....64-69.
MIN HUMIDITY........23-28 PERCENT.
WIND (20 FT)........UPSLOPE/UPVALLEY WINDS 3 TO 6 MPH AT
                    MID-SLOPE LOCATIONS WITH EAST WINDS 6-12 MPH
                    IN EXPOSED LOCATIONS AND THROUGH DEEP CREEK
                    CANYON.
 UPR SLP/RIDGETOP...EAST WINDS 10-15 MPH WITH GUSTS TO 20 MPH.
MIXING HEIGHT.......5000 FT AGL.
MIXING WINDS........EAST AROUND 10-15 MPH.

$$
FORECASTER...HOENISCH
REQUESTED BY...HDC
TYPE OF REQUEST...PRESCRIBED
.TAG 20100420.DEEPC.01/TFX