726
FNUS73 KLOT 081425
FWSLOT
SPOT FORECAST FOR PINE DUNES FP PRESCRIBED BURN...LAKE COUNTY FOREST PRESERVE
NATIONAL WEATHER SERVICE CHICAGO IL
925 AM CDT WED APR 8 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 CDT ON APRIL 08.
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
A WARM, DRY, AND BREEZY DAY IS EXPECTED FOR THE BURN SITE.
TEMPERATURES WILL CONTINUE TO WARM TOWARDS THE MID-60S THIS
AFTERNOON WITH CLOUD COVER EXPECTED TO GRADUALLY DIMINISH THROUGH
THE AFTERNOON. WHILE DEW POINTS WILL BE SLOWLY INCREASING THROUGH
THE DAY, MINIMUM RH VALUES WILL STILL DIP INTO THE 30-35% RANGE. WINDS
WILL START OFF OUT OF THE SOUTHEAST AROUND 10-15 MPH WITH GUSTS
UP TO 25 MPH, BUT WILL BECOME SOUTHERLY (180-190 DIRECTION) BY
MIDDAY WITH GUSTS INCREASING UPWARDS OF 35 MPH THIS AFTERNOON.
THAT SAID, IF SKIES CLEAR OUT QUICKER THAN FORECAST THERE IS A
CHANCE THAT MIXING HEIGHTS COULD INCREASE AND RESULT IN LOCALLY
HIGHER GUSTS AND LOWER RH VALUES.
HEADING INTO TONIGHT, A COLD FRONT WILL MOVE THROUGH BURN SITE
BETWEEN 11 PM AND MIDNIGHT AND BRING WITH IT CHANCES FOR SHOWERS
AND A COUPLE OF EMBEDDED THUNDERSTORMS. THIS COLD FRONT IS
EXPECTED TO STALL ACROSS NORTHEAST IL AND NORTHWEST IN BY THURSDAY
MORNING. WHILE IT LOOKS AS IF WE WILL GET A BRIEF BREAK IN THE
RAIN THURSDAY MORNING, ADDITIONAL SHOWERS AND THUNDERSTORMS ARE
FORECAST TO DEVELOP THURSDAY EVENING AND PERSIST THROUGH THE
NIGHT. RAINFALL WITH THE SHOWERS/STORMS THURSDAY NIGHT COULD ALSO
BE LOCALLY HEAVY WITH FORECAST RAIN AMOUNTS AROUND 0.5 INCHES BUT
COULD BE LOCALLY HIGHER (AROUND 1 INCH) UNDER THUNDERSTORMS.
REST OF TODAY
SKY/WEATHER.........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY THEN
BECOMING MOSTLY SUNNY.
TEMPERATURE.........39 AT IGNITION...MAX 64.
RH..................72 PERCENT AT IGNITION...MIN 40 PERCENT.
WIND (20 FT)........WINDS SOUTH AT 16 MPH AT IGNITION...OTHERWISE
SOUTH WINDS 15 TO 18 MPH INCREASING TO 20 TO 21
MPH LATE IN THE AFTERNOON. GUSTS UP TO 35 MPH.
CHANCE OF PCPN......10 PERCENT.
TRANSPORT WINDS.....SOUTH 22 TO 25 MPH INCREASING TO 28 TO 32 MPH
IN THE AFTERNOON.
MIXING HEIGHT.......1300 FT AGL AT IGNITION...OTHERWISE 3400 FT
AGL.
SMOKE DISPERSAL.....FAIR /25600 KNOT-FT/ AT IGNITION.
MAX...EXCELLENT /95800 KNOT-FT/.
TIME (CDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........81 74 58 42 26 24 23 21 24
WEATHER COV.....
WEATHER TYPE....
TEMP............39 42 46 51 54 57 60 62 64
RH..............72 66 57 50 46 43 42 40 40
20 FT WIND DIR..160 170 180 180 190 190 190 190 200
20 FT WIND SPD..16 18 20 20 20 21 22 22 22
20 FT WIND GUST.28 31 31 31 32 33 33 35 35
MIX HGT (KFT)...1.3 1.4 1.6 2.1 2.3 2.7 3.2 3.4 3.4
TRANSP WIND DIR.160 170 180 180 190 190 190 190 190
TRANSP WIND SPD.22 24 25 28 29 30 30 32 30
CHC OF PCPN (%).10 0 0 0 0 0 0 0 0
VRATE KT-FT/1K..26 30 36 49 58 69 82 96 88
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
CHANCE OF RAIN SHOWERS IN THE EVENING, THEN
RAIN SHOWERS OVERNIGHT.
TEMPERATURE.........MIN 48.
RH..................MAX 93 PERCENT.
WIND (20 FT)........SOUTH WINDS 16 TO 18 MPH WITH GUSTS TO AROUND
33 MPH BECOMING WEST 9 TO 10 MPH.
CHANCE OF PCPN......80 PERCENT.
TRANSPORT WINDS.....SOUTHWEST 24 TO 29 MPH DECREASING TO 13 TO 15
MPH.
MIXING HEIGHT.......900 FT AGL.
SMOKE DISPERSAL.....GOOD (50100 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (9700 KNOT-FT) LATE IN THE
NIGHT.
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........27 29 44 59 74 80 86 92 90 87 84 71
WEATHER COV..... CHC LKY DEF LKY LKY CHC SCH
WEATHER TYPE.... RW RW RW RW RW RW RW
TEMP............62 60 60 60 60 60 59 58 56 55 53 51
RH..............43 47 49 50 52 56 60 66 73 78 84 90
20 FT WIND DIR..200 190 190 190 190 200 210 210 230 240 250 260
20 FT WIND SPD..21 17 17 18 20 20 20 18 16 13 12 10
20 FT WIND GUST.33 29 28 29 30 30 29 29 24 20 16 16
MIX HGT (KFT)...2.3 1.2 1.1 1.1 1.1 1.1 1.2 1.2 1.1 1.2 0.9 0.9
TRANSP WIND DIR.200 190 190 200 200 210 210 230 230 240 240 240
TRANSP WIND SPD.25 24 24 26 29 28 28 26 23 20 15 13
CHC OF PCPN (%).0 0 10 10 10 40 70 80 70 70 40 20
VRATE KT-FT/1K..50 24 24 26 27 27 29 27 22 21 12 10
THURSDAY
SKY/WEATHER.........MOSTLY CLOUDY.
TEMPERATURE.........MAX 62.
RH..................MIN 40 PERCENT.
WIND (20 FT)........WEST WINDS 8 TO 10 MPH DECREASING TO AROUND 8
MPH LATE IN THE AFTERNOON.
CHANCE OF PCPN......10 PERCENT.
TRANSPORT WINDS.....SOUTHWEST 12 TO 15 MPH INCREASING TO WEST 18 TO
23 MPH IN THE LATE MORNING AND EARLY AFTERNOON,
THEN INCREASING TO 23 TO 24 MPH LATE IN THE
AFTERNOON DECREASING TO AROUND 18 MPH LATE IN
THE AFTERNOON.
MIXING HEIGHT.......4200 FT AGL.
SMOKE DISPERSAL.....POOR (6000 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (88300 KNOT-FT) IN THE
AFTERNOON.
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........58 46 34 22 10 15 19 24 34 43 53 62
WEATHER COV.....
WEATHER TYPE....
TEMP............49 48 49 51 54 56 58 60 61 62 62 61
RH..............91 93 83 72 62 55 49 44 41 40 40 42
20 FT WIND DIR..260 250 250 260 270 270 270 260 260 270 270 280
20 FT WIND SPD..9 9 10 10 12 13 13 13 13 13 12 9
20 FT WIND GUST.15 13 13 14 16 20 21 21 21 20 18 15
MIX HGT (KFT)...0.7 0.6 1.4 2.0 2.3 2.7 3.1 3.6 4.2 4.2 4.1 2.9
TRANSP WIND DIR.240 240 250 260 270 270 270 270 270 270 270 290
TRANSP WIND SPD.13 12 15 18 18 20 22 23 24 24 23 18
CHC OF PCPN (%).0 10 10 10 10 10 10 10 10 10 10 10
VRATE KT-FT/1K..8 6 18 31 36 46 60 72 88 88 82 45
FORECASTER...YACK
REQUESTED BY...JIM HILLS- BURN BOSS
TYPE OF REQUEST...PRESCRIBED
.TAG 2609564.0/LOT
.DELDT 04/08/26
.FORMATTERVERSION 2.0.0
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