Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
923
FNUS75 KRIW 282323
FWSRIW
Spot Forecast for Deadline Ridge RX...BLM RSD
National Weather Service Riverton WY
523 PM MDT Tue May 28 2024
Forecast is based on ignition time of 1800 MDT on May 28.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Isolated showers will subside by 2000. Gusty outflow winds up to
30 mph could occur with these showers. Otherwise, south to
southwest winds with gusts up to 15 mph will remain possible
through the night. Scattered clouds (40-50 percent) will be in
place after sunrise Wednesday morning, as a cold front approaches
from the west. A shower could move over the area before 1200, but
the better chances for showers and thunderstorms will be between
1200 and 1700. The cold front is expected to pass through the area
between 1300 and 1600, turning the winds more west-northwest.
Winds will slowly subside Wednesday night, becoming light (10 mph
or less) by 0300. Conditions will be dry and cooler Thursday, but
west winds 15-20 mph with gusts up to 25 mph will remain possible
through the afternoon. Highs will be in the 50s and lows in the
mid 30s Friday morning.
...Thunderstorms imply strong gusty and erratic winds...
...Haines index is high level haines both day and night...
.TONIGHT...
Sky/weather.........Mostly cloudy (55-65 percent) then becoming
partly cloudy (25-35 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
LAL.................1.
Min temperature.....Around 48.
Max humidity........57 percent.
Wind (20 ft)........Southwest winds 5 to 7 mph becoming light.
Ridgetop wind.......Southwest 10 to 15 mph.
Mixing height.......7900 ft AGL decreasing to 500 ft AGL after
0000.
Transport winds.....Southwest 12 to 17 mph.
Smoke dispersal.....Very good decreasing to poor after 2200.
Haines Index........4 to 5 or low to moderate potential for large
plume dominated fire growth.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........61 45 33 21 17 12 7 21 35 49 46 42
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 10 0 0
LAL.............1 1 1 1 1 1 1 1 1 1 1 1
Temp............58 57 55 53 52 51 51 51 51 51 50 49
RH..............32 35 39 42 44 46 48 49 51 52 54 56
20 FT wind dir..SW SW SW SW SW SW SW W W SW SW SW
20 FT wind spd..6 6 6 7 6 6 6 6 6 6 5 4
20 FT wind gust.10 11 11 11 10 10 8 10 10 8 7 6
Ridge wind dir..S S S SW SW SW W W W SW SW SW
Ridge wind spd..15 15 15 15 15 15 15 15 15 10 10 10
Mix hgt (kft)...7.9 7.9 7.9 0.6 0.6 0.6 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.SW SW SW SW SW SW SW SW SW SW SW SW
Transp wind spd.17 17 17 13 13 13 13 13 13 12 12 12
Haines index....4 4 4 4 4 4 5 5 5 5 5 5
SDspl kt-ft/1000119 119 119 6 6 6 6 6 6 5 5 5
.WEDNESDAY...
Sky/weather.........Mostly sunny (25-35 percent). Chance of rain
showers by 1100. Chance of thunderstorms in
the afternoon.
CWR.................4 percent.
Chance of pcpn......40 percent.
LAL.................1 until 1200, then 3.
Max temperature.....Around 62.
Min humidity........34 percent.
Wind (20 ft)........Southwest winds 5 to 14 mph with gusts to
around 21 mph shifting to the west 16 to 18 mph
with gusts to around 28 mph after 1400.
Gusty and erratic winds expected near
thunderstorms in the afternoon.
Ridgetop wind.......Southwest 10 to 15 mph increasing to west
around 25 mph in the afternoon.
Mixing height.......500 ft AGL increasing to 1600 ft AGL late in
the morning, then increasing to 10700 ft AGL
early in the afternoon decreasing to 7900 ft
AGL late in the afternoon.
Transport winds.....Southwest 12 to 17 mph increasing to 28 to 31
mph after 1200, then turning west by 1500.
Smoke dispersal.....Poor increasing to excellent after 1200.
Haines Index........4 to 5 or low to moderate potential for large
plume dominated fire growth.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........38 34 29 25 30 34 39 33 28 23 24 26
Weather cov..... SCH CHC CHC CHC CHC CHC CHC SCH
Weather type.... RW RW RW RW RW RW RW RW
Tstm cov........ CHC CHC CHC CHC CHC SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 20 30 40 40 40 40 30 20
LAL.............1 1 1 1 1 1 3 3 3 3 3 3
Temp............48 50 53 55 57 60 62 61 60 58 56 53
RH..............57 53 49 45 41 38 34 39 44 49 50 52
20 FT wind dir..SW SW SW SW SW SW SW SW W W W W
20 FT wind spd..5 6 6 8 9 13 14 16 18 17 17 17
20 FT wind gust.7 8 10 13 14 19 21 24 28 26 26 26
Ridge wind dir..SW SW SW SW SW SW SW SW SW W W W
Ridge wind spd..10 10 10 15 15 15 25 25 25 25 25 25
Mix hgt (kft)...0.5 0.5 0.5 1.6 1.6 1.6 11 11 11 7.9 7.9 7.9
Transp wind dir.SW SW SW W W W SW SW SW W W W
Transp wind spd.12 12 12 17 17 17 28 28 28 31 31 31
Haines index....5 5 5 5 5 5 4 4 4 4 4 4
SDspl kt-ft/10005 5 5 24 24 24 256 256 256 213 213 213
.WEDNESDAY NIGHT...
Sky/weather.........Mostly clear (10-20 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
LAL.................1.
Min temperature.....Around 32.
Max humidity........53 percent.
Wind (20 ft)........West winds 9 to 18 mph decreasing to around 8
mph after 3 am. Gusts up to 35 mph through
2200.
Ridgetop wind.......West 20 to 25 mph decreasing to around 15 mph
after 0300.
Mixing height.......4600 ft AGL decreasing to 500 ft AGL in the
late evening and overnight.
Transport winds.....West 21 to 30 mph decreasing to around 15 mph
after 0300.
Smoke dispersal.....Very good early in the evening decreasing to
poor after 0000.
Haines Index........4 or low potential for large plume dominated
fire growth.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........27 20 13 6 5 3 2 2 3 4 7 11
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0
LAL.............1 1 1 1 1 1 1 1 1 1 1 1
Temp............50 47 43 40 39 37 36 35 35 34 33 33
RH..............53 53 52 51 47 44 40 43 46 48 49 50
20 FT wind dir..W W W W W W W W W W W W
20 FT wind spd..17 17 18 18 18 17 16 13 11 9 8 8
20 FT wind gust.25 26 28 28 28 25 24 19 17 14 13 13
Ridge wind dir..W W W W W W W W W W W W
Ridge wind spd..25 25 25 25 25 25 20 20 20 15 15 15
Mix hgt (kft)...4.6 4.6 4.6 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 0.5
Transp wind dir.W W W W W W NW NW NW W W W
Transp wind spd.30 30 30 26 26 26 21 21 21 15 15 15
Haines index....4 4 4 4 4 4 4 4 4 4 4 4
SDspl kt-ft/1000119 119 119 32 32 32 13 13 13 7 7 7
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Mostly clear. Lows in the lower 30s. Highs in the upper 50s. West
winds around 9 mph.
.SATURDAY...
Mostly clear. Lows in the upper 30s. Highs in the mid 60s. West
winds around 9 mph.
.SUNDAY...
Partly cloudy. Slight chance of showers and thunderstorms. Lows
in the lower 40s. Highs in the lower 60s. West winds around
11 mph.
$$
Forecaster...LaVoie
Requested by...Ross Dary
Type of request...PRESCRIBED
.TAG 2415153.1/RIW
.DELDT 05/28/24
.FormatterVersion 2.0.0
.EMAIL rdary@blm.gov