980
FNUS75 KBOU 222331
FWSBOU
SPOT FORECAST FOR MARFELL LAKES RX...BOULDER COUNTY SHERIFF OFFICE FIRE MANAGEMENT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
531 PM MDT THU OCT 22 2026
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
DRIER AND SUNNIER CONDITIONS ARE IN STORE FOR FRIDAY WITH MOSTLY SUNNY
SKIES FROM MID-MORNING THROUGH MID-AFTERNOON, AND HUMIDITY LOWERING INTO
THE 18-22% DURING PEAK HEATING. WINDS ARE ANTICIPATED TO BE OUT OF THE
SOUTH THROUGH THE MORNING, WITH SPEEDS PRIMARILY 5-10 MPH, HOWEVER
OCCASIONAL GUSTS TO 15 MPH CAN'T BE RULED OUT. AFTER 1300-1400, WINDS ARE
FAVORED TO TURN MORE SOUTHWESTERLY AND INCREASE IN STRENGTH. THE BURN SITE
WILL BE ON THE NORTHERN FRINGE OF THE CORRIDOR OF STRONGER WINDS, MAKING
THE TIMING AND STRENGTH OF THE AFTERNOON WINDS MORE UNCERTAIN THAN USUAL.
CURRENTLY, EXPECTING SUSTAINED WINDS IN THE 6-12 MPH RANGE WITH GUSTS NEAR
20 MPH, ALTHOUGH THERE IS POTENTIAL FOR HIGHER GUSTS NEAR 25 MPH IF THE
CORRIDOR OF HIGHER WINDS MIGRATES SLIGHTLY NORTHWARD. WIND SPEEDS WILL NEAR
SUNSET, AND SUBSEQUENTLY TURN OUT OF THE NORTH NEAR MIDNIGHT AS A WEAKENING
COLD FRONT ARRIVES FROM THE NORTH.
FAVORABLE SMOKE DISPERSAL IS ANTICIPATED THROUGHOUT THE DAY GIVEN THE
BREEZY CONDITIONS, WITH "GOOD" OR BETTER VENTILATION AS EARLY AS 1100.
FRIDAY
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT) UNTIL 1100, THEN
MOSTLY SUNNY (5-15 PERCENT) UNTIL 1600, THEN
PARTLY CLOUDY (20-30 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 78.
MIN HUMIDITY........18-23 PERCENT.
WIND (20 FT)........SOUTH WINDS 6 TO 11 MPH UNTIL 1400, THEN
SOUTHWEST 7 TO 12 MPH WITH GUSTS UP TO 20 MPH.
MIXING HEIGHT.......BELOW 1000 FT AGL UNTIL 1000, THEN 3300 FT AGL
UNTIL 1200, THEN 8000 FT AGL UNTIL 1400, THEN
9900 FT AGL UNTIL 1700, THEN 6000 FT AGL.
TRANSPORT WINDS.....SOUTH 8 TO 16 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1000, THEN MARGINAL UNTIL 1100, THEN
FAIR UNTIL 1200, THEN GOOD UNTIL 1700, THEN
FAIR.
TIME (MDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........75 52 34 12 5 9 18 26 22 19
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0
TEMP............54 59 67 71 75 77 77 78 77 75
RH..............71 62 45 35 28 23 21 20 21 22
20 FT WIND DIR..S S S S S S SW SW SW SW
20 FT WIND SPD..6 6 7 8 8 9 10 10 10 9
20 FT WIND GUST.9 9 12 14 16 16 17 19 18 17
MIX HGT (KFT)...0.5 0.7 1.9 3.7 6.7 8.2 9.8 10 8.7 6.0
TRANSP WIND DIR.S S S S S S SW S SW SW
TRANSP WIND SPD.8 10 14 13 13 15 16 16 13 12
VRATE KT-FT/1K..3 6 23 41 73 107 137 140 96 60
SMOKEDISPERSION.P P MG F G G G G G F
FRIDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
MIN TEMPERATURE.....AROUND 45.
MAX HUMIDITY........70 PERCENT.
WIND (20 FT)........WEST WINDS 5 TO 12 MPH UNTIL 2300, THEN AROUND
5 MPH UNTIL 0100, THEN VARIABLE UP TO 5 MPH.
MIXING HEIGHT.......BELOW 1000 FT AGL.
TRANSPORT WINDS.....WEST 8 TO 11 MPH UNTIL 2100, THEN LIGHT UNTIL
2200, THEN WEST AROUND 8 MPH UNTIL 2300, THEN 8
TO 9 MPH UNTIL 0100, THEN AROUND 8 MPH UNTIL
0300, THEN LIGHT UNTIL 0400, THEN EAST AROUND 8
MPH.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........18 25 23 29 29 29 24 13 17 23 21 30
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............71 64 61 59 57 56 54 52 50 49 47 46
RH..............27 35 39 42 45 49 55 56 61 65 68 70
20 FT WIND DIR..W W W W W W W NW N NE NE NE
20 FT WIND SPD..8 7 7 6 6 3 4 5 5 5 5 5
20 FT WIND GUST.13 12 12 9 9 6 7 8 10 11 12 10
MIX HGT (KFT)...0.8 0.5 0.5 0.5 0.5 0.5 0.4 0.5 0.4 0.3 0.5 0.5
TRANSP WIND DIR.W W W W W W W W W SW NE E
TRANSP WIND SPD.8 8 8 7 8 7 6 5 6 6 5 5
VRATE KT-FT/1K..5 4 3 3 3 3 2 2 2 2 2 2
SMOKEDISPERSION.P P P P P P P P P P P P
FORECASTER...RODRIGUEZ
REQUESTED BY...DUSTIN BLAIR
TYPE OF REQUEST...PRESCRIBED
.TAG 2624326.0/BOU
.DELDT 10/22/26
.FORMATTERVERSION 2.0.0
.EMAIL DBLAIR@BOULDERCOUNTY.GOV
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