640
FNUS75 KRIW 302203
FWSRIW

Spot Forecast for Natrona County Spot...Natrona County Emergency Management
National Weather Service Riverton WY
403 PM MDT Fri Oct 30 2026

Forecast is based on forecast start time of 1600 MDT on October 30.
If conditions become unrepresentative, contact the National Weather
Service

.DISCUSSION...

Wind is expected to remain east to southeast through this evening.
However, note that there is a wind boundary currently observed
nearby with a southwesterly wind at the airport to the west of
town. There is a 20% chance for the wind to switch to out of the
southwest between 1600 and 1800. Regardless, wind is expected to
be easterly after sunset, slowly transitioning to out of the north
by midnight. Otherwise, clouds will increase tonight, with a
10-20% chance of showers through Saturday morning. Any rain is
expected to be light with this activity. Saturday will see a
stronger southwest wind persist through the afternoon with gusts
near 30 mph.

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

.REST OF TODAY...

Sky/weather.........Mostly sunny (30-40 percent).
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 68.
Min humidity........28 percent.
Surface winds (mph).East winds around 9 mph with gusts to 18 mph.
Ridgetop wind.......Southwest 10 to 15 mph.
Mixing height.......5500 ft AGL until 1700, then 3500 ft AGL.
Transport winds.....Southwest 13 to 17 mph.

TIME (MDT)      4PM 5PM
Sky (%).........30  40
Weather cov.....
Weather type....
Tstm cov........
Chc of pcpn (%).0   0
Chc of thdr (%).0   0
Temp............66  63
RH..............29  31
Surface wnd dir.E   E
Surface wnd spd.9   8
Surface wnd gst.18  14
Ridge wind dir..SW  SW
Ridge wind spd..15  10
Mix hgt (kft)...5.5 3.5
Transp wind dir.SW  SW
Transp wind spd.17  13

.TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent) then becoming
                    mostly cloudy (60-70 percent).
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 39.
Max humidity........64 percent.
Surface winds (mph).Southeast to east around 5 mph until 1100,
then becoming north.
Ridgetop wind.......Southeast around 10 mph until 2300, then
                    northeast until 0100, then light.
Mixing height.......500 ft AGL.
Transport winds.....South around 8 mph until 1900, then southeast 7
                    to 10 mph until 0200, then south.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........40  30  20  10  40  45  55  70  75  75  75  75
Weather cov.....
Weather type....
Tstm cov........
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............61  55  51  49  48  47  45  45  43  42  42  41
RH..............35  42  48  51  53  54  56  57  61  62  62  63
Surface wnd dir.SE  SE  E   E   E   NE  N   N   N   NE  NE  NE
Surface wnd spd.4   4   4   5   4   4   4   3   3   3   3   3
Surface wnd gst.9   7   7   8   7   6   7   6   5   6   6   6
Ridge wind dir..SE  SE  E   E   E   NE  N   N   N   NE  SE  SE
Ridge wind spd..10  10  10  10  10  10  10  5   5   5   5   5
Mix hgt (kft)...0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.S   SE  E   E   SE  SE  SE  S   S   SW  S   S
Transp wind spd.8   8   9   9   10  10  8   7   8   7   8   10

.SATURDAY...

Sky/weather.........Mostly cloudy (75-85 percent) then becoming
                    mostly sunny (35-45 percent). Slight chance of
                    rain showers late in the morning.
Chance of pcpn......20 percent.
Chance of thunder...3 percent.
Max temperature.....Around 62.
Min humidity........46 percent.
Surface winds (mph).Light winds until 1000, then southwest 11 to 18
                    mph with gusts to around 29 mph.
Ridgetop wind.......Southeast around 10 mph until 0700, then
                    southwest until 1100, then 15 to 20 mph.
Mixing height.......2000 ft AGL until 1200, then 4500 ft AGL.
Transport winds.....Southwest 10 to 17 mph until 1100, then 21 to
                    24 mph.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........70  85  95  80  85  85  80  65  70  40  35  35
Weather cov.....                SCH SCH
Weather type....                RW  RW
Tstm cov........
Chc of pcpn (%).0   10  10  10  20  20  10  10  10  10  0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............41  40  42  45  49  52  55  58  60  60  62  60
RH..............64  63  65  61  61  60  57  54  49  46  45  46
Surface wnd dir.SE  W   W   SW  SW  SW  SW  SW  SW  SW  SW  SW
Surface wnd spd.4   5   5   8   11  15  18  18  18  18  15  13
Surface wnd gst.7   8   12  14  20  24  28  29  29  29  28  24
Ridge wind dir..SE  W   W   SW  SW  SW  SW  SW  SW  SW  SW  SW
Ridge wind spd..10  10  10  10  15  20  20  20  20  20  20  15
Mix hgt (kft)...0.5 0.5 0.5 0.5 1.5 2.0 3.0 3.5 4.0 4.5 4.0 3.5
Transp wind dir.SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW
Transp wind spd.10  12  13  13  17  21  22  23  23  24  24  24

.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...
Mostly cloudy. Chance of showers. Lows around 40. Highs in the
lower 60s. Light winds.
.MONDAY...
Cooler, showers. Lows in the upper 30s. Highs in the upper 40s.
Northwest winds around 9 mph.
.TUESDAY...
Partly cloudy. Chance of showers. Lows in the lower 30s. Highs in
the mid 50s. West winds around 8 mph.

$$
Forecaster...Myers
Requested by...Derrick Stewart
Type of request...HAZMAT
.TAG 2624952.0/RIW
.DELDT 10/30/26
.FormatterVersion 2.0.0
.EMAIL dstewart@natronacounty-wy.gov