608  
FNUS75 KBOU 291210  
FWSBOU  
 
SPOT FORECAST FOR ALLENSPARK PILES...NPS  
NATIONAL WEATHER SERVICE DENVER/BOULDER CO  
510 AM MST WED JAN 29 2025  
 
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
QUIET CONDITIONS ARE EXPECTED AGAIN TODAY WITH LIGHT  
WINDS. SMOKE DISPERSAL WILL REMAIN POOR TODAY AND TONIGHT. A  
SYSTEM PASSING TO THE SOUTH AND EAST OF THE AREA WILL BRING A  
CHANCE OF SNOW LATE TONIGHT THROUGH THE FIRST HALF OF THURSDAY,  
ALONG WITH GUSTY WINDS OUT OF THE NORTHWEST. GOOD SMOKE DISPERSAL  
IS FORECAST LATE MORNING THROUGH EARLY AFTERNOON.  
 
THE FLOW ALOFT SHOULD TURN WESTERLY THIS WEEKEND LEADING TO MILD  
AND GENERALLY DRY CONDITIONS. A FEW SNOW SHOWERS ARE POSSIBLE WITH  
LITTLE TO NO ACCUMULATION. SMOKE DISPERSAL LOOKS TO BE AT LEAST  
FAIR EACH DAY, WITH BETTER DISPERSAL POSSIBLE BOTH DAYS THIS  
WEEKEND.  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT) UNTIL 1500, THEN  
PARTLY CLOUDY (25-35 PERCENT).  
CWR.................3 PERCENT.  
CHANCE OF PCPN......10 PERCENT.  
MAX TEMPERATURE.....AROUND 34.  
MIN HUMIDITY........40 PERCENT.  
WIND (20 FT)........WEST WINDS AROUND 5 MPH UNTIL 0800, THEN  
SOUTHWEST UNTIL 1000, THEN SOUTH UNTIL 1200,  
THEN SOUTHEAST UP TO 5 MPH.  
MIXING HEIGHT.......2700 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 8 TO 12 MPH UNTIL 1000, THEN  
SOUTHEAST 9 TO 14 MPH UNTIL 1700, THEN LIGHT.  
SMOKE DISPERSAL.....POOR.  
 
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........5 6 16 16 17 19 19 20 22 28 30 36  
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 10 10 10 10  
TEMP............15 17 19 25 29 31 34 32 32 32 29 26  
RH..............53 49 47 44 40 43 41 47 49 49 55 65  
20 FT WIND DIR..W W W SW S S SE SE SE E SE SE  
20 FT WIND SPD..3 3 3 3 3 3 3 3 5 3 2 2  
20 FT WIND GUST.6 6 6 6 6 6 6 6 7 6 3 3  
MIX HGT (KFT)...1.3 1.3 1.3 1.4 2.1 2.4 3.0 3.2 3.0 2.8 2.5 1.3  
TRANSP WIND DIR.SW SW SW S SE S SE SE SE SE SE E  
TRANSP WIND SPD.9 10 9 8 9 12 13 13 13 12 9 6  
VRATE KT-FT/1K..10 12 11 10 17 24 33 35 33 28 20 7  
SMOKEDISPERSION.P P P P P P P P P P P P  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT) UNTIL 2300, THEN  
MOSTLY CLOUDY (55-65 PERCENT). SLIGHT CHANCE OF  
SNOW SHOWERS AFTER 2300 UNTIL 0500, THEN CHANCE  
OF SNOW.  
CWR.................11 PERCENT.  
CHANCE OF PCPN......30 PERCENT.  
MIN TEMPERATURE.....AROUND 19.  
MAX HUMIDITY........71 PERCENT.  
WIND (20 FT)........VARIABLE UP TO 5 MPH UNTIL 0100, THEN NORTHWEST  
5 TO 7 MPH.  
MIXING HEIGHT.......1300 FT AGL.  
TRANSPORT WINDS.....LIGHT WINDS UNTIL 1900, THEN NORTH 8 TO 10 MPH  
UNTIL 2200, THEN LIGHT UNTIL 2300, THEN NORTH 8  
TO 16 MPH.  
SMOKE DISPERSAL.....POOR.  
 
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........38 39 40 43 46 53 53 54 56 60 65 63  
WEATHER COV..... SCH SCH SCH SCH SCH SCH CHC  
WEATHER TYPE.... SW SW SW SW SW SW SN  
TSTM COV........  
CWR.............0 0 0 0 0 10 10 10 10 10 10 10  
CHC OF PCPN (%).10 10 10 10 10 20 20 20 20 20 20 30  
TEMP............23 22 22 21 21 20 20 21 22 21 22 21  
RH..............68 68 65 65 68 71 67 68 65 65 62 65  
20 FT WIND DIR..W NW NW NW NW NW NW NW NW NW NW NW  
20 FT WIND SPD..1 2 2 3 3 3 3 5 5 6 6 6  
20 FT WIND GUST.2 3 3 6 6 6 6 7 7 9 9 7  
MIX HGT (KFT)...1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3  
TRANSP WIND DIR.NE N N N N NW NW N N N N N  
TRANSP WIND SPD.6 7 7 8 7 8 8 12 13 15 16 16  
VRATE KT-FT/1K..6 8 8 9 8 9 9 13 14 17 18 18  
SMOKEDISPERSION.P P P P P P P P P P P P  
   
THURSDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (50-60 PERCENT) UNTIL 1100, THEN  
CLEARING. CHANCE OF SNOW UNTIL 1100.  
CWR.................11 PERCENT DECREASING TO 0 PERCENT LATE IN THE  
AFTERNOON.  
CHANCE OF PCPN......30 PERCENT.  
MAX TEMPERATURE.....AROUND 36.  
MIN HUMIDITY........36 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 8 TO 15 MPH WITH GUSTS TO  
AROUND 25 MPH.  
MIXING HEIGHT.......2900 FT AGL.  
TRANSPORT WINDS.....NORTH 17 TO 26 MPH UNTIL 1200, THEN 22 TO 31  
MPH UNTIL 1600, THEN NORTHWEST 13 TO 18 MPH.  
SMOKE DISPERSAL.....POOR UNTIL 1000, THEN FAIR UNTIL 1100, THEN  
GOOD UNTIL 1200, THEN VERY GOOD UNTIL 1400,  
THEN GOOD UNTIL 1500, THEN FAIR UNTIL 1600,  
THEN POOR.  
 
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........59 59 55 53 53 41 35 31 20 19 19 7  
WEATHER COV.....CHC CHC CHC CHC CHC  
WEATHER TYPE....SN SN SN SN SN  
TSTM COV........  
CWR.............10 10 10 10 10 0 0 0 0 0 0 0  
CHC OF PCPN (%).30 30 30 30 30 10 10 10 10 10 10 0  
TEMP............19 19 21 24 28 32 35 36 36 34 32 29  
RH..............67 67 59 57 50 43 38 36 38 40 43 44  
20 FT WIND DIR..NW NW NW NW N N N N N NW NW NW  
20 FT WIND SPD..7 8 9 10 10 11 15 15 13 9 8 8  
20 FT WIND GUST.9 12 13 15 16 15 29 29 26 23 20 18  
MIX HGT (KFT)...1.3 1.3 1.4 2.0 2.5 3.4 4.1 4.1 4.2 3.2 2.2 1.2  
TRANSP WIND DIR.N N N N N N N N N N NW NW  
TRANSP WIND SPD.17 20 21 22 24 26 31 29 25 22 17 14  
VRATE KT-FT/1K..20 22 25 37 52 78 111 102 92 60 34 15  
SMOKEDISPERSION.P P P P F G VG VG G F P P  
   
FORECAST DAYS 3 THROUGH 5
 
   
FRIDAY
 
 
MOSTLY CLEAR. LOWS AROUND 20. HIGHS IN THE LOWER 40S. WEST WINDS  
AROUND 12 MPH.    
SATURDAY
 
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF SNOW. LOWS IN THE UPPER 20S.  
HIGHS IN THE UPPER 30S. WEST WINDS AROUND 18 MPH.    
SUNDAY
 
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF RAIN. LOWS IN THE LOWER 30S.  
HIGHS IN THE MID 40S. WEST WINDS AROUND 19 MPH.  
 

 
FORECASTER...HIRIS  
REQUESTED BY...KELLY DOGGETT  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2501353.2/BOU  
.DELDT 01/29/25  
.FORMATTERVERSION 2.0.0  
.EMAIL KELLY_DOGGETT@NPS.GOV  
 
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