043
FNUS73 KLOT 262334
FWSLOT
SPOT FORECAST FOR BROWN CIRCLE...USFS
NATIONAL WEATHER SERVICE CHICAGO IL
534 PM CST THU FEB 26 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 CST ON FEBRUARY 27.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE AT (815) 834-0666 IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
AFTER A FAIRLY COOL START EARLY FRIDAY MORNING, TEMPERATURES ARE
EXPECTED TO RISE QUICKLY INTO THE 60S FRIDAY AFTERNOON. AS THIS
OCCURS, SOUTHWESTERLY WINDS WILL INCREASE AS BOUNDARY LAYER MIXING
DEEPENS, WITH WIND GUSTS NEAR 30-35 MPH FORECAST DURING THE
AFTERNOON. THERE IS STILL SOME UNCERTAINTY RELATED TO THE DEPTH OF
MIXING AND THUS TEMPERATURES, RH, AND PEAK WIND GUST VALUES
DURING THE AFTERNOON WITH A POTENTIAL--ABOUT 25 PERCENT AT THIS
TIME--FOR HIGHER TEMPERATURES, HIGHER MIXING HEIGHTS, LOWER MIN
RHS (IN THE LOW 20 PERCENTS), AND A BRIEF PERIOD OF HIGHER WIND
GUSTS (OVER 40 MPH) DURING THE 3 TO 5 PM TIME FRAME. WINDS AND
MIXING HEIGHTS WILL DIMINISH SHARPLY AFTER 6-7 PM WITH GOOD
OVERNIGHT RH RECOVERIES EXPECTED.
A COLD FRONT WILL TURN WINDS OUT OF THE NORTHWEST FRIDAY NIGHT
WITH MUCH COOLER CONDITIONS ON SATURDAY. A PASSING DISTURBANCE MAY
BRING A CHANCE FOR SOME LIGHT SNOW TO THE REGION, BUT AT THIS
TIME, THE BEST CHANCES EXIST NORTH OF I-88.
FRIDAY
SKY/WEATHER.........MOSTLY SUNNY.
TEMPERATURE.........41 AT IGNITION...MAX 63.
RH..................67 PERCENT AT IGNITION...MIN 28 PERCENT.
WIND (20 FT)........WINDS SOUTHWEST AT 13 MPH AT
IGNITION...OTHERWISE SOUTHWEST WINDS 12 TO 14
MPH WITH GUSTS TO AROUND 28 MPH INCREASING TO
18 TO 20 MPH WITH GUSTS TO AROUND 35 MPH IN THE
AFTERNOON.
CHANCE OF PCPN......0 PERCENT.
TRANSPORT WINDS.....SOUTHWEST 16 TO 21 MPH INCREASING TO 25 TO 29
MPH LATE IN THE MORNING, THEN INCREASING TO 31
TO 33 MPH LATE IN THE AFTERNOON DECREASING TO
AROUND 26 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......1000 FT AGL AT IGNITION...OTHERWISE 3900 FT
AGL.
SMOKE DISPERSAL.....FAIR /13800 KNOT-FT/ AT IGNITION.
MAX...EXCELLENT /107400 KNOT-FT/.
TIME (CST) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........15 15 6 7 8 16 20 21 15
WEATHER COV.....
WEATHER TYPE....
TEMP............41 48 53 58 61 63 63 62 60
RH..............67 56 44 37 33 30 28 29 32
20 FT WIND DIR..220 220 230 230 230 230 230 230 230
20 FT WIND SPD..13 15 17 20 21 22 22 20 16
20 FT WIND GUST.23 28 30 31 32 33 32 31 26
MIX HGT (KFT)...1.0 1.9 2.9 3.9 3.0 3.4 3.7 2.9 2.1
TRANSP WIND DIR.210 210 220 220 220 230 230 230 230
TRANSP WIND SPD.16 21 25 29 29 31 33 31 26
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0
VRATE KT-FT/1K..14 34 63 97 76 91 107 78 48
FRIDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
TEMPERATURE.........MIN 30.
RH..................MAX 79 PERCENT.
WIND (20 FT)........WEST WINDS 10 TO 12 MPH SHIFTING TO THE
NORTHWEST 6 TO 9 MPH IN THE LATE EVENING AND
OVERNIGHT, THEN SHIFTING TO THE NORTH 5 TO 6
MPH OVERNIGHT.
CHANCE OF PCPN......0 PERCENT.
TRANSPORT WINDS.....SOUTHWEST 18 TO 22 MPH SHIFTING TO THE
NORTHWEST 13 TO 16 MPH EARLY IN THE EVENING,
THEN SHIFTING TO THE NORTH 12 TO 13 MPH AFTER 3
AM.
MIXING HEIGHT.......800 FT AGL.
SMOKE DISPERSAL.....FAIR (24300 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (8300 KNOT-FT) LATE IN THE
NIGHT.
TIME (CST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........13 16 21 40 50 48 40 30 23 24 35 52
WEATHER COV.....
WEATHER TYPE....
TEMP............56 53 49 46 44 42 40 39 38 36 35 34
RH..............37 43 50 57 63 68 73 75 76 78 79 76
20 FT WIND DIR..230 260 280 290 310 320 330 340 350 000 000 000
20 FT WIND SPD..13 12 10 10 9 9 8 7 6 6 6 5
20 FT WIND GUST.22 20 18 18 17 17 16 14 12 9 9 12
MIX HGT (KFT)...1.3 1.4 1.4 1.5 1.4 1.4 1.3 1.2 1.0 0.8 0.9 0.9
TRANSP WIND DIR.230 250 280 290 300 310 320 320 330 340 340 350
TRANSP WIND SPD.22 18 16 15 14 13 13 13 13 13 12 12
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
VRATE KT-FT/1K..24 22 21 20 17 16 14 13 11 9 9 8
SATURDAY
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF SNOW IN THE
MORNING, THEN CHANCE OF SNOW IN THE AFTERNOON.
TEMPERATURE.........MAX 40.
RH..................MIN 49 PERCENT.
WIND (20 FT)........NORTH WINDS 5 TO 8 MPH WITH GUSTS TO AROUND 22
MPH SHIFTING TO THE NORTHEAST AROUND 9 MPH WITH
GUSTS TO AROUND 23 MPH IN THE AFTERNOON.
CHANCE OF PCPN......30 PERCENT.
TRANSPORT WINDS.....NORTHEAST 9 TO 13 MPH INCREASING TO AROUND 15
MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......2200 FT AGL.
SMOKE DISPERSAL.....POOR (8000 KNOT-FT) EARLY IN THE MORNING
INCREASING TO FAIR (23600 KNOT-FT) IN THE
AFTERNOON.
TIME (CST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........66 69 71 73 77 80 84 86 88 90 90 89
WEATHER COV.....SCH SCH SCH SCH SCH SCH CHC CHC CHC CHC CHC CHC
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TEMP............33 32 34 37 38 39 39 40 39 38 36 34
RH..............73 70 62 55 52 49 49 50 52 56 61 66
20 FT WIND DIR..000 000 010 010 020 030 030 030 030 030 030 030
20 FT WIND SPD..5 6 6 7 8 8 9 9 10 10 10 10
20 FT WIND GUST.15 17 18 20 21 22 22 23 23 22 21 20
MIX HGT (KFT)...0.9 1.2 1.5 1.8 1.9 2.1 2.2 2.2 2.2 2.2 2.0 1.9
TRANSP WIND DIR.000 000 010 020 020 030 030 030 040 040 040 030
TRANSP WIND SPD.10 12 12 13 12 10 9 10 10 12 13 15
CHC OF PCPN (%).20 20 20 20 20 20 30 30 30 30 30 30
VRATE KT-FT/1K..8 11 15 19 19 19 19 19 20 22 23 24
FORECASTER...CARLAW
REQUESTED BY...JAKE REED
TYPE OF REQUEST...PRESCRIBED
.TAG 2604162.0/LOT
.DELDT 02/26/26
.FORMATTERVERSION 2.0.0
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