041
FNUS75 KBOU 280959
FWSBOU
SPOT FORECAST FOR LAKE JOHN SWA BROADCAST...COLORADO DFPC
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
359 AM MDT WED OCT 28 2026
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
GUSTY SOUTH AND SOUTHWEST WINDS ARE EXPECTED TO PERSIST THROUGH MOST
OF THE DAY, WITH A SLIGHT INCREASE IN STRENGTH LATE MORNING THROUGH
THE AFTERNOON HOURS. PEAK GUSTS MAY APPROACH 30 MPH, BUT WILL MOSTLY
STAY CLOSER TO 25 MPH. THERE WILL LIKELY BE OCCASIONAL LULLS IN WIND
SPEEDS, ESPECIALLY IN THE MORNING, AND THESE BREAKS IN GUSTY
CONDITIONS COULD SUPPORT BRIEF DROPS IN TEMPERATURES/RISES IN HUMIDITY
THAT ARE NOT REFLECTED IN THE HOURLY TRENDS BELOW. NONETHELESS, EXPECT
MINIMUM AFTERNOON HUMIDITY VALUES TO FALL CLOSE TO 30% UNDER MOSTLY
CLEAR SKY CONDITIONS. SMOKE DISPERSAL WILL REMAIN HIGHLY FAVORABLE
GIVEN THE WIND, WITH "GOOD" OR BETTER VENTILATION AS EARLY AS 1000 OR
1100. WINDS ALOFT WILL TRANSPORT WINDS TO THE NORTHEAST.
A HIGH HUMIDITY RECOVERY IS FORECAST TONIGHT, ABOVE 80-90%, TOGETHER
WITH CONSIDERABLY WEAKER WINDS THAT WILL GENERALLY STAY BELOW 5-10 MPH
MOST OF THE NIGHT. THIS WILL SUPPORT NOTABLY COLDER TEMPERATURES, WITH
A HARD FREEZE EXPECTED.
THURSDAY WILL BRING DRIER AND SLIGHTLY WARMER CONDITIONS, ALONG WITH
A SLIGHT INCREASE IN CLOUD COVER. SOUTHWEST WINDS ARE FAVORED TO
DEVELOP DURING THE DAY, BUT WITH MUCH LOWER SPEEDS RELATIVE TO
WEDNESDAY. THUS, SMOKE DISPERSAL WILL SUFFER, AND IT'S POSSIBLE THAT
POOR VENTILATION WILL PERSIST FOR THE ENTIRE DAY.
[** NOTE FOR REQUESTER: RECENT WIND DIRECTION OBSERVATIONS FROM DFPC
PORTABLE 1 APPEAR SUSPECT. RECOMMEND CONTACTING NWS BOULDER UPON
RECEIPT OF THIS SPOT FORECAST TO DISCUSS FURTHER **].
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 54.
MIN HUMIDITY........31 PERCENT.
WIND (20 FT)........SOUTH WINDS 6 TO 13 MPH WITH GUSTS TO AROUND
20 MPH UNTIL 1000. THEN SOUTHWEST 8 TO 15 MPH WITH
GUSTS 25 TO 30 MPH.
MIXING HEIGHT.......BELOW 1000 FT AGL UNTIL 0900, THEN 5400 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 14 TO 19 MPH UNTIL 1000, THEN WEST 22
TO 29 MPH.
SMOKE DISPERSAL.....POOR UNTIL 0900, THEN MARGINAL UNTIL 1000, THEN
GOOD.
TIME (MDT) 5AM 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........16 12 12 21 25 10 18 16 14 12 18 23 36
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 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 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0 0
TEMP............34 34 35 35 36 40 46 52 53 54 54 53 51
RH..............55 52 51 50 48 47 44 42 36 33 31 33 39
20 FT WIND DIR..S S S S S SW SW SW SW SW SW SW SW
20 FT WIND SPD..7 8 8 8 8 9 10 11 12 13 12 11 10
20 FT WIND GUST.20 20 20 21 21 22 24 26 27 29 29 25 19
MIX HGT (KFT)...0.6 0.6 0.5 0.6 2.0 3.5 4.4 5.2 5.3 5.8 5.7 5.1 4.2
TRANSP WIND DIR.SW SW SW SW W W W W W W W W SW
TRANSP WIND SPD.18 18 17 15 16 23 28 29 29 29 26 24 22
VRATE KT-FT/1K..10 9 8 8 28 70 106 129 134 146 131 107 81
SMOKEDISPERSION.P P P P MG G G G G G G G G
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 20.
MAX HUMIDITY........90 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 7 MPH UNTIL 2100, THEN
SOUTH UNTIL 0400, THEN AROUND 5 MPH.
MIXING HEIGHT.......BELOW 1000 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 8 TO 13 MPH UNTIL 0300, THEN 8 TO 10
MPH.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........32 42 48 41 35 34 26 33 26 16 15 14
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
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............47 40 37 35 33 30 29 27 26 25 23 22
RH..............47 59 64 69 75 85 85 88 88 88 90 90
20 FT WIND DIR..SW SW SW S S S S S S S S S
20 FT WIND SPD..6 5 5 5 5 5 5 5 5 5 3 3
20 FT WIND GUST.9 7 7 7 7 7 7 7 7 7 6 6
MIX HGT (KFT)...0.8 0.5 0.5 0.5 0.5 0.5 0.6 0.5 0.5 0.5 0.5 0.5
TRANSP WIND DIR.SW SW SW SW SW S SW S SW SW SW SW
TRANSP WIND SPD.12 10 9 9 9 10 9 9 8 7 7 8
VRATE KT-FT/1K..8 5 4 4 4 4 4 4 4 3 3 4
SMOKEDISPERSION.P P P P P P P P P P P P
THURSDAY
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 56.
MIN HUMIDITY........23 TO 26 PERCENT.
WIND (20 FT)........VARIABLE UP TO 5 MPH UNTIL 1100, THEN SOUTH 4 TO 8
MPH, WITH GUSTS UP TO 18 MPH IN THE AFTERNOON.
MIXING HEIGHT.......BELOW 1000 FT AGL UNTIL 1000, THEN 3100 FT AGL
UNTIL 1200, THEN 6300 FT AGL UNTIL 1700, THEN
1400 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 8 MPH UNTIL 0700, THEN 8 TO 10
MPH UNTIL 0900, THEN LIGHT UNTIL 1000, THEN
SOUTHWEST 12 TO 20 MPH UNTIL 1700, THEN WEST
AROUND 12 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1100, THEN FAIR UNTIL 1200, THEN
GOOD UNTIL 1700, THEN POOR.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........13 36 34 34 35 49 52 43 41 49 34 31
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
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............22 20 21 27 37 45 51 54 55 56 55 53
RH..............92 96 92 85 64 47 37 31 26 24 26 33
20 FT WIND DIR..S NE SW S S S S S S SW SW S
20 FT WIND SPD..3 3 2 2 3 5 6 7 8 7 6 4
20 FT WIND GUST.5 5 5 6 9 12 17 18 18 17 15 11
MIX HGT (KFT)...0.5 0.5 0.5 0.5 1.7 3.5 5.1 6.2 6.8 6.3 5.1 1.4
TRANSP WIND DIR.SW SW SW SW S SW SW SW SW SW SW W
TRANSP WIND SPD.8 7 7 7 12 16 20 16 18 18 15 12
VRATE KT-FT/1K..4 3 3 3 17 49 87 86 109 100 66 14
SMOKEDISPERSION.P P P P P F G G G G G P
FORECASTER...RODRIGUEZ
REQUESTED BY...MICHAEL GARCIA
TYPE OF REQUEST...PRESCRIBED
.TAG 2624713.1/BOU
.DELDT 10/28/26
.FORMATTERVERSION 2.0.0
.EMAIL MICHAELB.GARCIA@STATE.CO.US
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