793
FNUS75 KBOU 122350
FWSBOU
SPOT FORECAST FOR FOUNTAIN GULCH IC...TIMBERLINE FIRE
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
550 PM MDT WED AUG 12 2026
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
CURRENT RADAR SHOWS A LINE OF THUNDERSTORMS
APPROACHING THIS LOCATION FROM THE WEST. FREQUENT LIGHTNING IS
OBSERVED WITH THESE STORMS, AND THE CHANCE FOR THUNDERSTORMS WILL
CONTINUE (~70% CHANCE) THROUGH 2100. CURRENT OBSERVATIONS INDICATE
WINDS ARE FAIRLY VARIABLE, WITH A SLIGHTLY MORE SOUTHEASTERLY
COMPONENT. GUSTS TO AROUND 15 MPH ARE CURRENTLY OBSERVED, BUT WITH
THE ONSET OF THE ONCOMING STORMS, EXPECTING WINDS TO BECOME GUSTY
WESTERLY WITH OBSERVATION JUST UPSTREAM OF THIS LOCATION SHOWING
35-40 MPH GUSTS. RELATIVE HUMIDITY IS AROUND 30-40% AND EXPECTED
TO INCREASE WITH THE APPROACHING STORMS. OVERNIGHT TEMPERATURES
ARE EXPECTED TO DROP INTO THE UPPER 40S TO LOW 50S. A FEW SHOWERS
MAY LINGER PAST 2100 (UNTIL AROUND 2300), THOUGH LIGHTNING
CONCERNS ARE EXPECTED TO LOWER SIGNIFICANTLY AFTER 2100. GUSTY AND
VARIABLE WINDS WILL STILL BE A CONCERN WITH ANY PASSING SHOWERS.
WINDS ARE EXPECTED TO SETTLE INTO A WESTERLY TO NORTHWESTERLY
COMPONENT FOR THE OVERNIGHT HOURS, WITH LIGHT WIND SPEEDS EXPECTED
TO REMAIN UNDER 10 MPH.
FOR THURSDAY, LIGHT AND VARIABLE WINDS ARE EXPECTED THROUGH THE
MORNING, BECOMING SOUTHEASTERLY AROUND 1000, WITH A GRADUAL
INCREASE IN WIND GUST SPEEDS BETWEEN 10-15 MPH BY 1200. WINDS ARE
EXPECTED TO MAINTAIN A SOUTHEASTERLY TO EASTERLY COMPONENT THROUGH
THE AFTERNOON OUTSIDE OF ANY PASSING SHOWERS/STORMS. SHOWER
CHANCES WILL INCREASE AROUND 0900, WITH THUNDERSTORMS LIKELY BY
1200-1300. STORMS WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL
TOMORROW, WITH A 70-90% CHANCE OF WETTING RAINS EXPECTED THROUGH
THE AFTERNOON.
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) UNTIL 0200, THEN
PARTLY CLOUDY (30-40 PERCENT). RAIN SHOWERS
LIKELY AND CHANCE OF THUNDERSTORMS UNTIL 2100,
THEN CHANCE OF RAIN SHOWERS UNTIL 2400.
CWR.................32 PERCENT DECREASING TO 3 PERCENT.
CHANCE OF THUNDER...36 PERCENT.
MIN TEMPERATURE.....AROUND 52.
MAX HUMIDITY........80 PERCENT.
WIND (20 FT)........WEST WINDS 5 TO 8 MPH. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS UNTIL 2100.
MIXING HEIGHT.......1200 FT AGL UNTIL 2000, THEN BELOW 1000 FT AGL.
TRANSPORT WINDS.....WEST 8 TO 13 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........86 85 85 78 69 69 56 52 38 36 34 39
WEATHER COV.....LKY LKY LKY CHC CHC CHC
WEATHER TYPE....RW RW RW RW RW RW
TSTM COV........CHC CHC CHC
CWR.............30 30 30 20 20 20 0 0 0 0 0 0
CHC OF THDR (%).40 40 40 10 10 10 10 10 10 0 0 0
TEMP............66 64 63 61 59 58 58 56 55 54 53 53
RH..............54 60 62 67 69 72 69 74 77 77 80 80
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..7 7 8 8 7 6 6 5 5 5 5 5
20 FT WIND GUST.12 12 13 13 12 9 9 7 7 7 7 7
MIX HGT (KFT)...1.7 1.2 0.6 0.5 0.5 0.6 0.4 0.5 0.4 0.5 0.5 0.5
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.8 13 13 10 10 10 9 9 9 8 8 9
VRATE KT-FT/1K..12 13 7 4 5 5 4 4 3 4 3 4
SMOKEDISPERSION.P P P P P P P P P P P P
THURSDAY
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT) UNTIL 0900, THEN
MOSTLY CLOUDY (70-80 PERCENT). CHANCE OF RAIN
SHOWERS UNTIL 1200, THEN RAIN SHOWERS WITH
THUNDERSTORMS LIKELY.
CWR.................14 PERCENT INCREASING TO 84 PERCENT.
CHANCE OF THUNDER...70 PERCENT.
MAX TEMPERATURE.....AROUND 71.
MIN HUMIDITY........51 PERCENT.
WIND (20 FT)........WEST WINDS AROUND 5 MPH UNTIL 0700, THEN
VARIABLE UP TO 5 MPH UNTIL 1100, THEN EAST 5 TO
7 MPH UNTIL 1700, THEN SOUTHEAST AROUND 5 MPH.
GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS AFTER 1200.
MIXING HEIGHT.......BELOW 1000 FT AGL UNTIL 0900, THEN 3300 FT AGL.
TRANSPORT WINDS.....WEST 8 TO 12 MPH UNTIL 0800, THEN 8 TO 9 MPH
UNTIL 1000, THEN AROUND 8 MPH UNTIL 1200, THEN
LIGHT UNTIL 1300, THEN WEST AROUND 8 MPH UNTIL
1400, THEN LIGHT UNTIL 1500, THEN SOUTHWEST
AROUND 8 MPH UNTIL 1600, THEN EAST UNTIL 1700,
THEN SOUTH.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........32 43 39 53 55 67 82 82 82 92 92 92
WEATHER COV..... CHC CHC CHC LKY LKY LKY DEF DEF DEF
WEATHER TYPE.... RW RW RW RW RW RW RW RW RW
TSTM COV........ LKY LKY LKY LKY LKY LKY
CWR.............10 10 10 10 10 10 70 70 70 80 80 80
CHC OF THDR (%).0 0 0 10 10 10 60 60 60 70 70 70
TEMP............52 53 58 62 68 69 70 67 67 66 65 64
RH..............80 77 67 60 51 51 53 61 63 65 63 67
20 FT WIND DIR..W W W NE SE SE SE E E E E SE
20 FT WIND SPD..5 3 2 2 3 5 6 6 6 5 5 5
20 FT WIND GUST.7 6 3 3 6 9 12 10 10 7 7 7
MIX HGT (KFT)...0.5 0.5 0.6 2.4 3.3 4.4 4.0 3.1 3.1 3.0 2.6 1.8
TRANSP WIND DIR.W W W W W SW SW W NE SW E S
TRANSP WIND SPD.9 9 7 6 5 6 7 8 7 8 8 8
VRATE KT-FT/1K..4 4 4 12 13 22 24 22 19 21 18 13
SMOKEDISPERSION.P P P P P P P P P P P P
FORECASTER...BONNER
REQUESTED BY...BRUSH 55
TYPE OF REQUEST...WILDFIRE
.TAG 2619579.0/BOU
.DELDT 08/12/26
.FORMATTERVERSION 2.0.0
.EMAIL TIMBERLINECR@GMAIL.COM
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