Spot Forecast
Issued by NWS Great Falls, MT
Issued by NWS Great Falls, MT
612
FNUS75 KTFX 221803
FWSTFX
Spot Forecast for 2026 Stampede Fair...Lewis and Clark County Emergency Management
National Weather Service Great Falls MT
1203 PM MDT Wed Jul 22 2026
Forecast is based on forecast start time of 1700 MDT on July 22.
If conditions become unrepresentative...contact the National Weather
Service.
.DISCUSSION...
Isolated showers and thunderstorms develop this evening near the
fair, with a 30% chance of it impacting the fair site. The best
window for thunderstorms will be between 1900 Wednesday to 0000
Thursday. The main hazards with thunderstorms will be gusty winds
between 30-50 mph, lightning, and heavy rainfall. Heavy rainfall
can cause muddy fields. For Thursday, another round of isolated
showers and thunderstorms are possible in the afternoon with
similar thunderstorm hazards.
.REST OF TODAY...
Sky/weather.........Partly sunny (60-70 percent).
Chance of pcpn......10 percent.
Chance of lightning.10 percent.
Max temperature.....88-93.
Min humidity........25-30 percent.
Surface winds (mph).North winds around 5 mph.
Pcpn amount.........0.00 inches.
Visibility..........10.
TIME (MDT) 5PM
Sky (%).........63
Weather cov.....
Weather type....
Tstm cov........
Chc of pcpn (%).10
Chc of ltng (%).10
Temp............89
RH..............32
Surface wnd dir.N
Surface wnd spd.5
Surface wnd gst.10
Visibility (sm).10
.TONIGHT...
Sky/weather.........Mostly cloudy (75-85 percent) then becoming
mostly clear (15-25 percent). Chance of showers
and thunderstorms in the evening.
Chance of pcpn......30 percent.
Chance of lightning.26 percent.
Min temperature.....59-64.
Max humidity........67-72 percent.
Surface winds (mph).Northeast winds around 5 mph early in the
evening shifting to the south, then shifting to
the east late in the evening becoming light.
Pcpn amount.........0.05 inches.
Visibility..........10.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........76 84 94 87 74 90 81 64 28 9 16 22
Weather cov.....CHC SCH CHC CHC SCH
Weather type....RW RW RW RW RW
Tstm cov........CHC SCH CHC SCH SCH
Chc of pcpn (%).30 20 30 30 20 10 10 0 0 0 0 0
Chc of ltng (%).30 20 30 20 20 10 10 0 0 0 0 0
Temp............89 88 86 82 77 75 73 70 68 66 64 63
RH..............30 32 35 40 47 50 53 60 63 66 69 71
Surface wnd dir.NE S S S E SW NW W W W W W
Surface wnd spd.5 5 5 5 5 0 0 0 0 0 0 0
Surface wnd gst.10 10 10 10 5 5 5 5 5 5 5
Visibility (sm).10 10 10 10 10 10 10 10 10 10 10 10
.THURSDAY...
Sky/weather.........Mostly sunny (25-35 percent). Slight chance of
showers and thunderstorms in the afternoon.
Chance of pcpn......20 percent.
Chance of lightning.22 percent.
Max temperature.....91-96.
Min humidity........19-24 percent.
Surface winds (mph).Light winds becoming southeast around 5 mph
early in the afternoon, then shifting to the
west late in the afternoon.
Pcpn amount.........0.02 inches.
Visibility..........10.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........18 18 18 22 22 22 35 35 35 43 43 43
Weather cov..... SCH SCH SCH SCH SCH SCH
Weather type.... RW RW RW RW RW RW
Tstm cov........ SCH SCH SCH SCH SCH SCH
Chc of pcpn (%).0 0 0 0 0 0 20 20 20 20 20 20
Chc of ltng (%).0 0 0 0 0 0 20 20 20 20 20 20
Temp............62 64 67 70 76 80 84 87 90 91 91 92
RH..............72 70 65 60 55 48 41 36 31 29 28 26
Surface wnd dir.W W W E E E SE SE SE W W W
Surface wnd spd.0 0 0 0 0 0 5 5 5 5 5 5
Surface wnd gst.5 5 5 5 5 5 15 15 15 15 15 15
Visibility (sm).10 10 10 10 10 10 10 10 10 10 10 10
$$
Forecaster...Wilson
Requested by...Autumn Ashdale
Type of request...OTHER
.TAG 2617965.0/TFX
.DELDT 07/22/26
.FormatterVersion 2.0.0
.EMAIL GHolmlund@lccountymt.gov,aashdale@lccountymt.gov,JISBELL@lccountymt.gov,KTenney@lccfairgrounds.com, tfx.ops@noaa.gov