Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
393
FNUS75 KRIW 301137
FWSRIW
Spot Forecast for Porqupine...USFS BTF
National Weather Service Riverton WY
537 AM MDT Mon Jun 30 2025
Forecast is based on forecast start time of 0700 MDT on June 30.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Southeast winds to start this morning, turning to the south-
southwest by 1200. Skies will be mostly clear through much of the
day, with high-based cumulus for a few hours late in the afternoon
into the evening. RH recovery will be poor tonight. There will be
a chance (20%) for virga showers/thunderstorms between 1500 and
2000 Tuesday. Precipitation chances will be possible Wednesday,
with increasing chances Wednesday night into Thursday. There will
be a good chance for a wetting rain from these storms.
...Thunderstorms imply strong gusty and erratic winds...
.TODAY...
Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...3 percent.
Max temperature.....Around 78.
Min humidity........19 percent.
Wind (20 ft)........Southeast winds 8 to 9 mph until 1100, then
south around 7 mph until 1200, then light.
Ridgetop wind.......Southeast around 15 mph until 1200. Northwest
after 1700.
Mixing height.......1500 ft AGL until 1000. 10000 ft AGL after
1400.
Transport winds.....Southeast 15 to 17 mph until 1000. West 8 to 10
mph after 1500.
Smoke dispersal.....Poor until 0900. Good after 1200.
TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........0 0 0 0 0 0 5 5 5 10 10
Weather cov.....
Weather type....
Tstm cov........
CWR.............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
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0
Temp............48 51 59 66 70 72 73 74 75 74 74
RH..............58 54 46 41 32 30 28 25 24 22 21
20 FT wind dir..SE SE SE SE S SW SW SW SW W NW
20 FT wind spd..9 9 8 8 7 6 6 4 3 3 4
20 FT wind gust.13 12 12 10 8 7 6 6 6 6
Ridge wind dir..SE SE SE SE S SW SW SW SW W NW
Ridge wind spd..15 15 15 15 15 15 10 10 10 10 10
Mix hgt (kft)...0.5 0.5 1.5 3.5 5.0 6.0 7.5 9.0 10 10 9.5
Transp wind dir.E SE SE S S S SW SW W W W
Transp wind spd.16 17 15 15 14 13 12 9 8 8 10
SDspl kt-ft/10006 7 22 47 60 68 76 71 69 69 86
.TONIGHT...
Sky/weather.........Mostly clear (5-15 percent).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...3 percent.
Min temperature.....Around 50.
Max humidity........45 percent.
Wind (20 ft)........Light winds.
Ridgetop wind.......North around 10 mph until 2000, then east.
Mixing height.......9500 ft AGL until 1900. 500 ft AGL after 2000.
Transport winds.....West around 9 mph until 2100, then north until
2200, then east 8 to 9 mph until 0500, then
southeast around 10 mph.
Smoke dispersal.....Good decreasing to fair until 2000, then poor.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........15 15 10 5 5 5 5 5 5 5 5 5
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
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............73 70 66 63 60 57 54 53 52 52 51 51
RH..............22 25 29 33 35 36 37 37 38 38 38 38
20 FT wind dir..N N E E E E E E E SE SE SE
20 FT wind spd..4 4 4 4 4 4 4 4 3 3 4 5
20 FT wind gust.6 6 6 6 6 6 6 5 5 5 5 6
Ridge wind dir..N N E E E E E E E SE SE SE
Ridge wind spd..10 10 10 10 10 10 10 10 10 10 10 10
Mix hgt (kft)...9.5 7.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W NW W N E E E E E E E SE
Transp wind spd.9 9 9 9 9 9 9 9 8 8 9 10
SDspl kt-ft/100076 60 3 3 3 3 3 3 2 3 3 4
.TUESDAY...
Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...12 percent.
Max temperature.....Around 81.
Min humidity........19 percent.
Wind (20 ft)........Light winds until 1200, then southwest around 7
mph with gusts to around 12 mph until 1400,
then northwest with gusts to around 12 mph
until 1500, then light. Gusty and erratic winds
expected near thunderstorms late in the
afternoon.
Ridgetop wind.......South 10 to 15 mph until 1100, then southwest
until 1400, then north until 1700, then east.
Mixing height.......2000 ft AGL until 1000, then 5500 ft AGL until
1100, then 9000 ft AGL until 1200, then 12500
ft AGL until 1600, then 9000 ft AGL.
Transport winds.....South 10 to 13 mph until 1000, then west 12 to
14 mph until 1700, then around 10 mph.
Smoke dispersal.....Poor until 1000, then fair until 1100, then
increasing to very good until 1300, then very
good until 1600, then good.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........5 10 10 15 15 15 15 20 25 30 30 30
Weather cov..... SCH SCH SCH
Weather type.... RW RW RW
Tstm cov........ SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 10 10 10 10 10 10 10 10
Chc of thdr (%).0 0 0 0 10 10 10 10 10 10 10 10
Temp............51 56 61 66 70 75 79 78 78 77 75 73
RH..............38 36 34 31 28 25 22 20 19 20 21 24
20 FT wind dir..SE SE S S S SW SW W NW NW N E
20 FT wind spd..6 6 6 5 6 6 7 7 7 6 6 5
20 FT wind gust.7 7 7 8 10 10 11 12 12 12 11 10
Ridge wind dir..SE SE S S S SW SW W NW NW N E
Ridge wind spd..15 10 10 10 10 15 15 15 15 15 10 10
Mix hgt (kft)...0.5 0.5 0.5 2.0 5.5 9.0 12 13 12 11 9.0 7.5
Transp wind dir.SE SE S S SW SW W W W W W W
Transp wind spd.13 12 12 10 12 13 14 14 14 13 12 10
SDspl kt-ft/10004 4 7 19 53 97 135 149 139 119 90 65
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...
Partly cloudy. Chance of showers and thunderstorms. Lows in the
upper 50s. Highs in the upper 70s. West-southwest winds 10-15 mph.
.THURSDAY...
Mostly cloudy with chance of showers and thunderstorms. Lows in
the mid 50s. Highs in the upper 60s. West winds 10-15 mph.
.INDEPENDENCE DAY...
Mostly cloudy. Chance of showers and thunderstorms. Lows in the
lower 50s. Highs around 70. West winds 10-15 mph.
$$
Forecaster...LaVoie
Requested by...IC
Type of request...WILDFIRE
.TAG 2516775.3/RIW
.DELDT 06/30/25
.FormatterVersion 2.0.0
.EMAIL michael.mcewen@usda.gov