398  
FNUS72 KMLB 160811  
FWSMLB  
 
SPOT FORECAST FOR THREE LAKES - WILLIAMS BIG BLOCK...FWC  
NATIONAL WEATHER SERVICE MELBOURNE FL  
411 AM EDT THU JUL 16 2026  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 EDT ON JULY 16.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
LIGHT AND VARIABLE WINDS THIS MORNING WILL PICK UP OUT OF THE  
WEST AT 5 TO 10 MPH THIS AFTERNOON. MOISTURE IS ANTICIPATED TO  
INCREASE TODAY, WITH MINIMUM RH VALUES REMAINING WELL ABOVE  
CRITICAL THRESHOLDS NEAR THE BURN SITE. GENERALLY GOOD AFTERNOON  
SMOKE DISPERSION VALUES WILL DECREASE TO FAIR LATE IN THE AFTERNOON.  
INCREASING COVERAGE OF SHOWERS AND STORMS ARE FORECAST THROUGH  
THIS AFTERNOON, PRIMARILY AFTER 2 PM. FREQUENT LIGHTNING STRIKES,  
WIND GUSTS UP TO 55 MPH, AND HEAVY DOWNPOURS ARE ALL POSSIBLE WITH  
ANY STORMS THAT DEVELOP. ACTIVITY WILL DIMINISH INTO THE LATE  
EVENING AND OVERNIGHT HOURS.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (20-30 PERCENT) THEN BECOMING PARTLY  
SUNNY (55-65 PERCENT). SLIGHT CHANCE OF SHOWERS  
AND THUNDERSTORMS EARLY IN THE AFTERNOON.  
CHANCE OF SHOWERS AND THUNDERSTORMS IN THE  
AFTERNOON.  
CHANCE OF PCPN......50 PERCENT.  
MAX TEMPERATURE.....AROUND 93.  
MIN HUMIDITY........54 PERCENT.  
WIND (20 FT)........WEST WINDS 5 TO 9 MPH. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON.  
MIXING HEIGHT.......1700 FT AGL INCREASING TO 4800 FT AGL IN THE  
LATE MORNING AND AFTERNOON, THEN DECREASING TO  
2000 FT AGL LATE IN THE AFTERNOON.  
TRANSPORT WINDS.....WEST 9 TO 12 MPH.  
DISPERSION INDEX....7 INCREASING TO 55, THEN DECREASING TO 32.  
LVORI...............5 DECREASING TO 1.  
 
TIME (EDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........1 1 6 19 30 37 46 40 53 66  
WEATHER COV..... SCH CHC CHC CHC CHC CHC  
WEATHER TYPE.... RW RW RW RW RW RW  
TSTM COV........ SCH CHC CHC CHC CHC CHC  
CHC OF PCPN (%).0 0 0 0 20 30 50 50 50 50  
TEMP............77 80 86 88 90 91 91 91 92 89  
RH..............90 82 70 66 60 58 58 57 54 59  
20 FT WIND DIR..W W W W W W W W W NW  
20 FT WIND SPD..5 6 7 8 8 8 9 8 8 7  
20 FT WIND GUST.8 9 12 13 14 15 16 16 16 15  
MIX HGT (KFT)...0.7 1.7 2.9 3.8 4.3 4.8 4.5 4.4 3.1 2.0  
TRANSP WIND DIR.W NW W W W W W W W NW  
TRANSP WIND SPD.9 12 10 10 9 10 10 10 10 12  
DISPERSION IDX..7 24 38 47 47 55 55 54 44 32  
LVORI...........5 3 3 1 1 1 1 1 1 1  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING  
PARTLY CLOUDY (30-40 PERCENT). CHANCE OF  
SHOWERS AND THUNDERSTORMS EARLY IN THE EVENING,  
THEN SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS  
EARLY IN THE EVENING.  
CHANCE OF PCPN......40 PERCENT.  
MIN TEMPERATURE.....AROUND 74.  
MAX HUMIDITY........100 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 5 TO 6 MPH EARLY IN THE EVENING  
BECOMING LIGHT. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS EARLY IN THE  
EVENING.  
MIXING HEIGHT.......400 FT AGL.  
TRANSPORT WINDS.....WEST 3 TO 10 MPH DECREASING TO 5 TO 6 MPH AFTER  
3 AM.  
DISPERSION INDEX....20 DECREASING TO 2.  
LVORI...............2 INCREASING TO 6.  
 
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........71 73 50 30 35 22  
WEATHER COV.....CHANCE S CHC  
WEATHER TYPE....RNSHWR RNSHWR NONE NONE NONE NONE  
TSTM COV........CHANCE S CHC  
CHC OF PCPN (%).40 20 10 0 0 0  
TEMP............88 82 79 77 76 76  
RH..............61 77 82 88 90 92  
20 FT WIND......NW 6 NE 3 SW 1 SW 1 SW 2 SW 2  
20 FT WIND GUST.13 6 3 3 5 5  
MIX HGT (FT)....1400 600 400 400 400 400  
TRANSPORT WIND..NW 10 N 6 W 3 W 6 W 6 W 5  
DISPERSION IDX..20 3 2 2 3 2  
LVORI...........2 4 5 6 6 6  
   
FRIDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT) THEN BECOMING  
MOSTLY CLOUDY (70-80 PERCENT). SLIGHT CHANCE OF  
SHOWERS AND THUNDERSTORMS LATE IN THE MORNING.  
CHANCE OF SHOWERS AND THUNDERSTORMS IN THE  
AFTERNOON.  
CHANCE OF PCPN......50 PERCENT.  
MAX TEMPERATURE.....AROUND 92.  
MIN HUMIDITY........62 PERCENT.  
WIND (20 FT)........LIGHT WINDS BECOMING WEST 5 TO 6 MPH LATE IN  
THE MORNING. GUSTY AND ERRATIC WINDS EXPECTED  
NEAR THUNDERSTORMS LATE IN THE MORNING.  
MIXING HEIGHT.......2100 FT AGL INCREASING TO 4300 FT AGL LATE IN  
THE MORNING.  
TRANSPORT WINDS.....WEST 5 TO 7 MPH.  
DISPERSION INDEX....2 INCREASING TO 31, THEN DECREASING TO 19.  
LVORI...............8 DECREASING TO 2.  
 
TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........21 24 23 30 50 64  
WEATHER COV..... CHANCE CHANCE CHANCE  
WEATHER TYPE....NONE NONE NONE RNSHWR RNSHWR RNSHWR  
TSTM COV........ CHANCE CHANCE CHANCE  
CHC OF PCPN (%).0 10 10 30 50 40  
TEMP............75 77 85 88 90 90  
RH..............94 96 72 66 62 62  
20 FT WIND......SW 3 SW 3 W 3 W 6 W 6 W 5  
20 FT WIND GUST.5 6 7 9 10 10  
MIX HGT (FT)....400 500 2100 3500 4300 3100  
TRANSPORT WIND..W 6 W 5 W 6 W 6 W 7 W 6  
DISPERSION IDX..2 3 15 26 31 19  
LVORI...........8 7 3 3 2 2  
 

 
FORECASTER...TOLLEFSEN  
REQUESTED BY...STEVE GLASS  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2617425.0/MLB  
.DELDT 07/16/26  
.FORMATTERVERSION 2.0.0  
.EMAIL STEVE.GLASS@MYFWC.COM  
 
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