395
FNUS73 KLOT 211130
FWSLOT
SPOT FORECAST FOR HALONATURE PRESERVE...IL DNR
NATIONAL WEATHER SERVICE CHICAGO IL
630 AM CDT TUE APR 21 2026
FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON APRIL 21.
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
PARTLY CLOUDY SKIES WILL BECOME MOSTLY CLOUDY LATER THIS MORNING
FOLLOWED BY A SLIGHT CHANCE FOR A FEW SHOWERS AND AN EMBEDDED
THUNDERSTORM EARLY THIS AFTERNOON. TEMPERATURES WILL WARM THROUGH
THE 50S AND 60S THIS MORNING PEAKING IN THE LOWER 70S THIS
AFTERNOON. MIDDAY RHS ARE FORECAST AS LOW AS AROUND 50%. SW WINDS
WILL REGULARLY GUST BETWEEN 20 AND 25 MPH, OCCASIONALLY TO 30 MPH,
FROM MID-MORNING THROUGH MID-AFTERNOON BEFORE EASING.
FOG AND LOW STRATUS MAY BUILD IN OFF THE LAKE AND MOVE OVER THE
BURN SITE LATE TONIGHT INTO WEDNESDAY MORNING WHICH WOULD CLEAR UP
BY MID-MORNING. THE REST OF WEDNESDAY WILL SEE PARTLY CLOUDY
SKIES, SE WINDS AT 10 TO 15 MPH, AND HIGHS AGAIN IN THE LOWER 70S
WITH NO RAIN EXPECTED.
TODAY
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
ISOLATED SHOWERS AND THUNDERSTORMS EARLY IN THE
AFTERNOON. SCATTERED SHOWERS AND THUNDERSTORMS
EARLY IN THE AFTERNOON, THEN ISOLATED SHOWERS
AND THUNDERSTORMS LATE IN THE AFTERNOON.
TEMPERATURE.........61 AT IGNITION...MAX 74.
RH..................62 PERCENT AT IGNITION...MIN 54 PERCENT.
WIND (20 FT)........WINDS SOUTHWEST AT 16 MPH AT
IGNITION...OTHERWISE SOUTHWEST WINDS 13 TO 15
MPH WITH GUSTS TO AROUND 28 MPH BECOMING WEST
LATE IN THE AFTERNOON. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS EARLY IN THE
AFTERNOON.
CHANCE OF PCPN......30 PERCENT.
TRANSPORT WINDS.....SOUTHWEST 22 TO 24 MPH SHIFTING TO THE WEST
AROUND 18 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......1500 FT AGL AT IGNITION...OTHERWISE 4800 FT
AGL.
SMOKE DISPERSAL.....GOOD /32000 KNOT-FT/ AT IGNITION.
MAX...EXCELLENT /91300 KNOT-FT/.
TIME (CDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........50 54 58 59 68 66 63 56
WEATHER COV..... ISO SCT ISO
WEATHER TYPE.... RW RW RW
TEMP............61 64 67 68 70 72 73 74
RH..............62 59 57 57 56 54 54 54
20 FT WIND DIR..220 230 230 230 240 250 250 260
20 FT WIND SPD..16 16 16 16 16 15 14 12
20 FT WIND GUST.28 28 26 25 25 24 23 18
MIX HGT (KFT)...1.5 2.0 2.5 2.8 3.1 4.0 4.8 2.9
TRANSP WIND DIR.220 230 230 230 240 250 250 260
TRANSP WIND SPD.24 24 23 24 22 23 22 18
CHC OF PCPN (%).0 0 10 20 30 20 10 10
VRATE KT-FT/1K..32 42 49 59 59 79 91 47
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY.
TEMPERATURE.........MIN 48.
RH..................MAX 92 PERCENT.
WIND (20 FT)........WEST WINDS 5 TO 8 MPH EARLY IN THE EVENING
BECOMING LIGHT.
CHANCE OF PCPN......10 PERCENT.
TRANSPORT WINDS.....WEST 9 TO 13 MPH SHIFTING TO THE NORTHEAST 7 TO
12 MPH IN THE LATE EVENING AND OVERNIGHT.
MIXING HEIGHT.......300 FT AGL.
SMOKE DISPERSAL.....POOR (2000 KNOT-FT).
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........50 43 36 25 15 16 16 19 21 24 27 28
WEATHER COV.....
WEATHER TYPE....
TEMP............73 70 66 63 61 59 57 55 53 52 50 49
RH..............56 63 71 76 78 80 83 86 87 89 92 90
20 FT WIND DIR..270 280 310 010 040 040 050 050 050 050 050 060
20 FT WIND SPD..8 6 5 5 3 3 3 3 3 3 3 5
20 FT WIND GUST.14 10 9 9 8 8 8 8 8 8 9 8
MIX HGT (KFT)...1.0 0.4 0.5 0.4 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
TRANSP WIND DIR.270 280 310 010 040 050 050 050 050 050 050 060
TRANSP WIND SPD.13 10 9 8 7 8 10 9 9 12 12 10
CHC OF PCPN (%).0 10 10 10 10 0 0 0 0 0 0 0
VRATE KT-FT/1K..11 4 4 3 2 2 3 3 3 3 3 3
WEDNESDAY
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY SUNNY.
TEMPERATURE.........MAX 74.
RH..................MIN 53 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING EAST 5 TO 6 MPH IN THE
MORNING, THEN SHIFTING TO THE SOUTHEAST 6 TO 7
MPH IN THE AFTERNOON.
CHANCE OF PCPN......0 PERCENT.
TRANSPORT WINDS.....EAST 7 TO 10 MPH SHIFTING TO THE SOUTHEAST IN
THE AFTERNOON.
MIXING HEIGHT.......3500 FT AGL.
SMOKE DISPERSAL.....POOR (2600 KNOT-FT) EARLY IN THE MORNING
INCREASING TO FAIR (26900 KNOT-FT) IN THE
AFTERNOON.
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........28 29 26 22 19 17 15 13 14 15 16 15
WEATHER COV.....
WEATHER TYPE....
TEMP............48 49 52 56 61 65 68 70 72 73 74 73
RH..............90 90 87 81 74 68 64 61 58 55 53 54
20 FT WIND DIR..060 060 070 090 100 110 120 130 130 140 150 140
20 FT WIND SPD..5 5 5 6 6 7 7 7 8 8 8 8
20 FT WIND GUST.9 9 9 9 10 10 12 12 12 12 13 13
MIX HGT (KFT)...0.3 0.3 0.6 0.8 1.2 1.5 2.1 2.6 3.2 3.4 3.5 2.6
TRANSP WIND DIR.060 060 070 090 100 110 130 130 140 140 150 140
TRANSP WIND SPD.10 9 10 9 7 7 8 8 7 7 9 10
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
VRATE KT-FT/1K..3 3 5 6 7 9 15 18 20 22 27 22
FORECASTER...DOOM
REQUESTED BY...GRIFFITH
TYPE OF REQUEST...PRESCRIBED
.TAG 2611060.0/LOT
.DELDT 04/21/26
.FORMATTERVERSION 2.0.0
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