248 
FNUS75 KRIW 241131
FWSRIW

Spot Forecast for NE Fuels Pile Burn...Yellowstone National Park
National Weather Service Riverton WY
531 AM MDT Tue Oct 24 2017

Forecast is based on ignition time of 0700 MDT on October 24. 
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...Dry weather today and Wednesday. The wind will be
stronger on Wednesday ahead of an approaching weather system. 
Wednesday night toward midnight light rain will develop and 
quickly change over to snow as a strong cold front moves south
from Montana. The snow will end Thursday afternoon. 

...Thunderstorms imply strong gusty and erratic winds...
...Haines index is high level haines both day and night...

FORECASTER...AR

.TODAY...

Sky/weather.........Sunny. 
Max temperature.....52-55. 
Min humidity........26-29 percent. 
20-foot winds.......South to southwest at 5 to 9 mph with gusts
                    from 10 to 15 mph.
Ridge top winds.....West to southwest at 9 to 14 mph with gusts
                    to 20 mph. 
LAL.................No Tstms. 
Chc of wetting rain.Zero percent. 
Haines Index........4 or low potential for large plume dominated 
                    fire growth. 
Mixing height.......5000-6000 ft AGL. 
Transport winds.....West to northwest at 15 to 20 mph.
Smoke dispersal.....Becoming Fair by 1200. Then Good by 1400. 

.TONIGHT...

Sky/weather.........Clear.
Min temperature.....26-29. 
Max humidity........64-68 percent. 
20-foot winds.......North to northwest at 5 to 8 mph.
Ridge top winds.....West at 7 to 12 mph.
LAL.................No Tstms. 
Chc of wetting rain.Zero percent. 
Haines Index........4 or low potential for large plume dominated 
                    fire growth. 
Mixing height.......Decreasing to 500 FT AGL after midnight.
Transport winds.....West at 10 mph. 
Smoke dispersal.....Decreasing to Fair after sunset. Then Poor 
                    after midnight.

.WEDNESDAY...

Sky/weather.........Partly cloudy.
Max temperature.....54-57. 
Min humidity........26-29 percent. 
20-foot winds.......South to southwest 5 to 9 mph until 1200.
                    Then south to southwest at 10 to 14 mph with
                    gusts to 18 mph after 1200.
Ridge top winds.....West to Southwest 6 to 10 mph until 1100.
                    West to southwest at 13 to 18 mph with gusts
                    20 to 25 mph after 1100.
LAL.................No Tstms. 
Chc of wetting rain.Zero percent. 
Haines Index........4 or low potential for large plume dominated 
                    fire growth. 
Mixing height.......6000-7000 ft AGL. 
Transport winds.....West at 10 to 15 mph until 1200.
                    West at 20 to 25 mph after 1200.
Smoke dispersal.....Becoming Fair by 1200. Then Very good by 1400.

.FORECAST DAYS 3 THROUGH 5...

.WEDNESDAY NIGHT...
Mostly cloudy. Chance of light rain toward midnight.
Rain quickly changing to snow after midnight. Local snowfall
of 1 inch. Lows near 20. North winds around 10 mph...gusty 
to 20 mph with the cold front passage around midnight.  

.THURSDAY...
A chance of light snow until 1200, then decreasing clouds 
in the afternoon. Highs around 34 to 38. 
Winds generally less than 10 mph. 

.FRIDAY...
Mostly clear. Lows around 20. Highs in the upper 40s. Winds
generally less than 10 mph. 

.SATURDAY...
Mostly clear. Lows in the mid 20s. Highs in the lower 50s.
Winds generally less than 10 mph. 

$$
Forecaster...Ross
Requested by...Bill Mayer
Type of request...PRESCRIBED
.TAG 1717324.1/RIW
.EMAIL bill_mayer@nps.gov