840  
FNUS75 KBOU 300406  
FWSBOU  
 
SPOT FORECAST FOR PIERSON PARK FUELBREAK #1...USFS  
NATIONAL WEATHER SERVICE DENVER/BOULDER CO  
906 PM MST WED JAN 29 2025  
 
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION  
A STORM SYSTEM WILL BRING GUSTY NORTH TO NORTHWEST  
WINDS. THE BURN AREA MAY BE SHELTERED SOMEWHAT FROM THE GUSTY  
WINDS. THERE WILL BE A SLIGHT CHANCE OF SNOW DURING THE MORNING  
HOURS, BUT THE BEST CHANCE FOR SNOW WILL STAY WELL EAST OF THE  
AREA. THERE WILL BE JUST ENOUGH MIXING TO COMBINE WITH THE GUSTY  
WINDS TO BRING A FEW HOURS OF FAIR SMOKE DISPERSION DURING THE  
AFTERNOON.  
 
   
THURSDAY  
 
SKY/WEATHER.........MOSTLY CLOUDY (45-55 PERCENT) UNTIL 0800, THEN  
PARTLY CLOUDY (35-45 PERCENT) UNTIL 1100, THEN  
MOSTLY SUNNY (10-20 PERCENT). SLIGHT CHANCE OF  
SNOW UNTIL 1100.  
CWR.................6 PERCENT.  
CHANCE OF PCPN......30 PERCENT.  
MAX TEMPERATURE.....AROUND 30.  
MIN HUMIDITY........40 PERCENT.  
WIND (20 FT)........NORTH WINDS 11 TO 16 MPH WITH GUSTS TO AROUND  
24 MPH UNTIL 1600, THEN NORTHWEST WITH GUSTS TO  
AROUND 22 MPH.  
MIXING HEIGHT.......BELOW 1000 FT AGL UNTIL 1100, THEN 2400 FT AGL  
UNTIL 1600, THEN BELOW 1000 FT AGL.  
TRANSPORT WINDS.....NORTH 17 TO 25 MPH UNTIL 1600, THEN NORTHWEST  
12 TO 17 MPH.  
SMOKE DISPERSAL.....POOR UNTIL 1200, THEN FAIR UNTIL 1500, THEN  
POOR.  
 
TIME (MST) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........51 45 36 35 20 25 22 21 19 18 6  
WEATHER COV.....CHC SCH SCH SCH  
WEATHER TYPE....SN SN SN SN  
TSTM COV........  
CWR.............10 10 10 10 0 0 0 0 0 0 0  
CHC OF PCPN (%).30 20 20 20 10 10 10 10 10 10 0  
TEMP............20 20 24 26 27 28 28 28 29 27 25  
RH..............51 48 43 42 40 40 40 41 40 43 44  
20 FT WIND DIR..N N N N N N N N NW NW NW  
20 FT WIND SPD..14 14 14 14 15 14 13 13 12 12 14  
20 FT WIND GUST.22 22 22 22 24 22 21 21 18 18 22  
MIX HGT (KFT)...0.1 0.1 0.1 0.8 1.7 2.2 2.5 2.1 1.2 0.1 0.1  
TRANSP WIND DIR.N N N N N N N N N NW NW  
TRANSP WIND SPD.17 18 18 22 24 25 24 22 18 14 14  
VRATE KT-FT/1K..0 0 0 15 36 49 52 40 19 0 0  
SMOKEDISPERSION.P P P P P F F F P P P  
   
THURSDAY NIGHT  
 
SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT).  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
MIN TEMPERATURE.....AROUND 18.  
MAX HUMIDITY........47 PERCENT.  
WIND (20 FT)........BREEZY. WEST WINDS 15 TO 25 MPH UNTIL 0300,  
THEN 21 TO 29 MPH. GUSTS UP TO 35 MPH.  
MIXING HEIGHT.......BELOW 1000 FT AGL.  
TRANSPORT WINDS.....WEST 18 TO 25 MPH.  
SMOKE DISPERSAL.....POOR.  
 
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........6 6 6 7 9 10 9 9 8 7 6 5  
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 0 0 0 0  
TEMP............23 22 21 21 21 20 19 20 21 21 21 21  
RH..............47 47 47 45 43 45 46 45 43 41 39 37  
20 FT WIND DIR..W W W W W W W W W W W W  
20 FT WIND SPD..15 16 18 20 21 22 23 23 24 24 25 25  
20 FT WIND GUST.23 25 28 29 29 30 31 32 33 35 35 35  
MIX HGT (KFT)...0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1  
TRANSP WIND DIR.NW NW W W W W W W W W W W  
TRANSP WIND SPD.18 18 20 21 22 23 23 24 24 24 25 25  
VRATE KT-FT/1K..0 0 0 0 0 0 0 0 0 0 0 0  
SMOKEDISPERSION.P P P P P P P P P P P P  
   
FRIDAY  
 
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT) UNTIL 1400, THEN  
PARTLY CLOUDY (25-35 PERCENT).  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
MAX TEMPERATURE.....AROUND 36.  
MIN HUMIDITY........32 PERCENT.  
WIND (20 FT)........WEST WINDS 15 TO 25 MPH WITH GUSTS TO AROUND 35  
MPH.  
MIXING HEIGHT.......BELOW 1000 FT AGL.  
TRANSPORT WINDS.....WEST 16 TO 24 MPH.  
SMOKE DISPERSAL.....POOR.  
 
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........6 8 9 10 10 11 17 22 28 31 33 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 0 0 0 0  
TEMP............22 22 24 26 29 32 34 35 35 34 32 30  
RH..............38 39 38 36 35 33 32 32 32 33 34 35  
20 FT WIND DIR..W W W W W W W W W W SW SW  
20 FT WIND SPD..24 23 22 20 17 16 15 15 15 15 16 17  
20 FT WIND GUST.33 33 32 31 31 30 30 30 30 29 29 29  
MIX HGT (KFT)...0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.2 0.3 0.2 0.1 0.1  
TRANSP WIND DIR.W W W W W W W W W W W W  
TRANSP WIND SPD.24 24 23 21 18 16 18 21 23 22 22 21  
VRATE KT-FT/1K..0 0 0 0 0 0 2 3 5 4 2 0  
SMOKEDISPERSION.P P P P P P P P P P P P  
 
 
FORECASTER...MEIER  
REQUESTED BY...JONATHAN JACOBSEN  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2501691.0/BOU  
.DELDT 01/30/25  
.FORMATTERVERSION 2.0.0  
.EMAIL JONATHAN.JACOBSEN@USDA.GOV  
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