399
FNUS75 KRIW 030155
FWSRIW

Spot Forecast for Strong Draw...WYS
National Weather Service Riverton WY
755 PM MDT Tue Sep 2 2025

Forecast is based on forecast start time of 2000 MDT on September 02.
If conditions become unrepresentative, contact the National Weather
Service

.DISCUSSION...
A few rain showers moving southeast off the Bighorn Mountains could
linger until around 2200L Tuesday. Little rainfall is expected, but
gusty outflow wind around 30 mph, mainly from the north, is possible
with any nearby shower. Northerly flow aloft remains in place
Wednesday and Thursday, which allows a cold front to sweep south each
morning. The first of these cold fronts arrives shortly after sunrise
Wednesday. A north wind and cooler temperatures follow passage of this
front. A few afternoon showers may sneak southeast off the Bighorn
Mountains, but these look to be weak and short-lived. A stronger cold
front passes late Thursday morning and produces gusty north wind
15 to 30 mph for the remainder of the day until sunset Thursday.

...Thunderstorms imply strong gusty and erratic winds...

.REST OF TONIGHT...

Sky/weather.........Partly cloudy (30-40 percent) with isolated
                    rain showers until 2200L. Becoming mostly clear
                    (20-30 percent) after 0100L.
CWR.................5 percent.
Chance of pcpn......20 percent until 2200L.
Chance of thunder...0 percent.
Min temperature.....Around 55.
Max humidity........70 percent.
Wind (20 ft)........North wind 6 to 9 mph. Any nearby shower could
                    produce gusty northerly outflow wind around
                    30 mph until 2200L.
Ridgetop wind.......Northwest around 10 mph.
Mixing height.......Decreasing to less than 1000 ft AGL by 2200L.
Transport winds.....North 10 to 15 mph.
Smoke dispersal.....Decreasing to Poor by 2200L.

TIME (MDT)      8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........40  35  35  30  30  25  20  20  20  15
Weather cov.....ISO ISO
Weather type....RW  RW
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0
Chc of pcpn (%).20  10  0   0   0   0   0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0
Temp............75  72  68  67  65  64  62  60  59  58
RH..............32  35  39  42  45  48  50  52  56  60
20 FT wind dir..N   NW  NW  NW  NW  NW  NW  NW  NW  N
20 FT wind spd..5   5   5   5   5   6   6   6   6   6
20 FT wind gust.6   6   6   6   7   7   8   10  10  10
Ridge wind dir..N   NW  NW  NW  W   NW  NW  NW  NW  N
Ridge wind spd..10  10  10  10  10  10  15  15  15  15
Mix hgt (kft)...0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.N   N   W   W   W   NW  NW  N   N   N
Transp wind spd.12  12  10  10  12  12  13  13  14  13
SDspl kt-ft/10004   5   4   4   4   5   5   5   5   5

.WEDNESDAY...

Sky/weather.........Mostly sunny (10-20 percent) until 1300L,
                    then gradually increasing clouds as weak
                    showers form over the central Bighorn Range
                    and move southeast during the afternoon.
                    Becoming partly sunny (50-60) percent
                    by 1500L.
CWR.................0 percent.
Chance of pcpn......5 percent.
Chance of thunder...0 percent.
Max temperature.....74 to 77.
Min humidity........34 to 37 percent.
Wind (20 ft)........North wind 6 to 9 mph until 0700L, when a weak
                    cold front pushes south across the fire site.
                    Speeds increase slightly to 8 to 12 mph behind
                    the cold front.
Ridgetop wind.......North 10 to 15 mph.
Mixing height.......Less than 1000 ft AGL until 0900L, then
                    gradually increasing to around 5000 ft AGL
                    by 1400L.
Transport winds.....North 10 to 15 mph.
Smoke dispersal.....Poor until 0900L, then gradually becoming Good
                    by 1400L.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........10  10  10  10  10  15  20  35  50  60  55  45
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   5   5   5   5
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............56  55  58  62  66  69  71  73  75  75  76  76
RH..............64  70  69  61  56  51  46  42  39  41  39  38
20 FT wind dir..N   N   N   N   N   N   N   N   N   N   N   NE
20 FT wind spd..6   7   7   8   7   7   6   6   7   7   8   8
20 FT wind gust.8   11  12  12  11  10  10  10  11  12  12  12
Ridge wind dir..N   N   N   N   N   N   N   N   N   N   N   NE
Ridge wind spd..15  15  15  15  15  15  15  15  15  15  15  15
Mix hgt (kft)...0.5 0.5 1.0 1.5 2.0 3.0 3.5 4.5 4.5 5.0 5.0 4.5
Transp wind dir.N   N   N   N   N   N   N   N   N   N   N   N
Transp wind spd.13  14  14  15  14  14  13  13  14  14  15  15
SDspl kt-ft/10006   6   9   19  25  33  40  49  55  58  62  59

.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...
A cold front pushes across the fire site between 0900L and 1100L.
Gusty north wind 15 to 30 mph follows the cold front and
continues until around 2100L. Partly cloudy early, then clouds
decreasing. Highs near 80. Lows in the mid 40s.
.FRIDAY...
Mostly clear and cooler. Highs around 70. Lows in the mid 40s.
North wind around 10 mph.
.SATURDAY...
Mostly clear and warmer. Highs in the upper 70s. Lows in the
mid 40s. Southeast wind 5 to 10 mph.
.SUNDAY...
Mostly cloudy with a slight chance of afternoon and early evening
showers and thunderstorms. Highs in the upper 70s. Lows in the
lower 50s. Northwest wind 5 to 10 mph.

$$
Forecaster...CNJ
Requested by...Bayer
Type of request...WILDFIRE
.TAG 2521163.0/RIW
.DELDT 09/02/25
.FormatterVersion 2.0.0
.EMAIL wycpc@firenet.gov,ibayer@blm.gov