FNUS75 KRIW 040941 FWSRIW SPOT FORECAST FOR STEPHENS CREEK RX...NPS YNP NATIONAL WEATHER SERVICE RIVERTON WY 341 AM MDT THU APR 4 2013 FORECAST IS BASED ON IGNITION TIME OF 1300 MDT ON APRIL 04. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...A RIDGE OF HIGH PRESSURE WILL BRING MILD TEMPERATURES SIMILAR TO WEDNESDAY WITH SLIGHTLY HIGHER RELATIVE HUMIDITY. THIS RIDGE WILL GIVE WAY TO AN APPROACHING UPPER LEVEL DISTURBANCE TONIGHT. A FEW SHOWERS MOVE INTO THE AREA IN THE LATE AFTERNOON...AFTER 1600L. THESE SHOWERS WILL INCREASE TONIGHT. SURFACE WINDS ALONG THE YELLOWSTONE RIVER WILL BE PRIMARILY DOWNSTREAM OR SOUTH SOUTHEAST TODAY...MOSTLY PROTECTED FROM INCREASING SOUTHWEST WIND AT RIDGE TOP LEVEL. A MORE POTENT PACIFIC SYSTEM WILL PUSH ACROSS THE AREA AROUND MIDDAY FRIDAY BRINGING MORE NUMEROUS RAIN SHOWERS...CHANGING OVER TO SNOW IN THE AFTERNOON ALONG STRONGER MORE ERRATIC WINDS. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...MEUNIER .TODAY... SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT. ISOLATED SHOWERS POSSIBLE AFTER 1600L. MAX TEMPERATURE.....56-59. MIN HUMIDITY........30-33 PERCENT. 20 FOOT WINDS.......SOUTH SOUTHEAST OR DOWN RIVER 5-9 MPH WITH OCCASIONAL GUSTS TO 15 MPH IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTH 5 TO 10 MPH IN THE MORNING. SOUTHWEST 15 TO 20 MPH IN THE AFTERNOON. MIXING HEIGHT.......800-1800 FT AGL IN THE MORNING...INCREASING TO NEAR 4000 FT AGL BETWEEN NOON AND 1400. TRANSPORT WINDS.....SOUTHWEST 15-20 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....POOR (11300-19100 KNOT-FT) IN THE MORNING. BECOMING FAIR TO GOOD IN THE AFTERNOON (60000 KNOT-FT). .TONIGHT... SKY/WEATHER.........BECOMING CLOUDY (90-100 PERCENT). SLIGHT CHANCE OF RAIN SHOWERS IN THE EVENING...THEN CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. MIN TEMPERATURE.....AROUND 40. MAX HUMIDITY........84-87 PERCENT. 20 FOOT WINDS.......DOWN RIVER 4-7 MPH. RIDGE TOP WINDS.....SOUTHWEST 10 TO 15 MPH. MIXING HEIGHT.......900-1900 FT AGL. TRANSPORT WINDS.....SOUTH 13 TO 15 MPH. SMOKE DISPERSAL.....POOR (12900-21100 KNOT-FT). .FRIDAY... SKY/WEATHER.........CLOUDY (75-85 PERCENT). SCATTERED RAIN SHOWERS AND ISOLATED THUNDERSTORMS THROUGH EARLY AFTERNOON...MIXING WITH SNOW IN THE AFTERNOON. MAX TEMPERATURE.....AROUND 50 AROUND NOON THEN TEMPERATURES FALLING THROUGH THE 40S IN THE AFTERNOON. MIN HUMIDITY........40-43 PERCENT. 20 FOOT WINDS.......DOWN RIVER 5-9 MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH BECOMING WEST 20 TO 25 MPH IN THE AFTERNOON. MIXING HEIGHT.......1800-2800 FT AGL IN THE MORNING. INCREASING TO NEAR 4000 FEET AGL IN THE AFTERNOON TRANSPORT WINDS.....SOUTHWEST 12 TO 14 MPH...BECOMING WEST 20 TO 25 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....POOR (16500-29500 KNOT-FT) IN THE MORNING. GOOD (80000 KNOT-FT) IN THE AFTERNOON. .FORECAST DAYS 3 THROUGH 5... .FRIDAY NIGHT...MOSTLY CLOUDY. CHANCE OF SHOWERS IN THE EVENING... THEN SLIGHT CHANCE OF SHOWERS AND SNOW SHOWERS AFTER MIDNIGHT. LOWS AROUND 30. WINDS GENERALLY LESS THAN 10 MPH. .SATURDAY...MOSTLY CLOUDY. CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS IN THE UPPER 40S. WINDS GENERALLY LESS THAN 10 MPH. .SUNDAY...MOSTLY CLOUDY WITH CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS IN THE MID 40S. WINDS GENERALLY LESS THAN 10 MPH. .MONDAY...PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN THE UPPER 20S. HIGHS IN THE MID 40S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...MEUNIER REQUESTED BY...JESSICA PAGE REASON FOR REQUEST...PRESCRIBED .TAG 20130404.STEPH.01/RIW