403
FNUS72 KMLB 180843
FWSMLB

Spot Forecast for Dupuis BU4...SFWMD
National Weather Service Melbourne FL
443 AM EDT Tue Aug 18 2026

Forecast is based on ignition time of 0700 EDT on August 18.
If conditions become unrepresentative, contact the National Weather
Service.

...HEAT ADVISORY IN EFFECT FROM 10 AM THIS MORNING TO 8 PM EDT
THIS EVENING...

.DISCUSSION...

Westerly winds between 5 to 10 mph are forecast along with no
minimum RH concerns. Smoke dispersion values will be fair to
generally good. The wind direction is anticipated to become more
variable as the east coast sea breeze attempts to push inland.
Shower and storm chances increase after 3 PM near the burn site,
and any storms that do develop will be capable of producing
lightning strikes, wind gusts up to 55 mph, and heavy downpours
that could lead to minor, localized flooding. Activity is forecast
to push offshore late this evening into the overnight hours.
Similar conditions are forecast on Wednesday with smoke dispersion
values becoming fair.

.REST OF TODAY...

Sky/weather.........Sunny (10-20 percent). Slight chance of showers
                    and thunderstorms late in the afternoon.
Chance of pcpn......20 percent.
Max temperature.....Around 96.
Min humidity........51 percent.
Wind (20 ft)........West winds 5 to 9 mph. Gusty and erratic winds
                    expected near thunderstorms late in the
                    afternoon.
Mixing height.......2200 ft AGL increasing to 3800 ft AGL late in
                    the morning.
Transport winds.....West 7 to 10 mph.
Dispersion index....3 increasing to 46, then decreasing to 36.
LVORI...............9 decreasing to 1.

TIME (EDT)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........4   4   10  7   6   3   4   5   4   30  30
Weather cov.....                                    SCH SCH
Weather type....                                    RW  RW
Tstm cov........                                    SCH SCH
Chc of pcpn (%).0   0   0   0   0   0   0   10  10  20  20
Temp............76  78  82  86  88  90  93  94  94  96  95
RH..............100 100 88  77  75  68  62  58  56  51  51
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..5   6   7   7   8   8   8   9   8   7   7
20 FT wind gust.9   10  12  12  13  14  14  15  15  14  14
Mix hgt (kft)...0.4 0.5 1.5 2.2 2.8 3.1 3.2 3.7 3.6 3.8 3.4
Transp wind dir.NW  NW  NW  NW  W   W   W   W   W   W   W
Transp wind spd.7   7   9   9   9   10  10  10  10  10  9
Dispersion idx..3   5   17  25  32  39  41  45  46  45  36
LVORI...........9   9   4   3   3   3   1   1   1   1   1

.TONIGHT...

Sky/weather.........Mostly clear (15-25 percent). Slight chance of
                    showers and thunderstorms in the evening.
Chance of pcpn......20 percent.
Min temperature.....Around 77.
Max humidity........100 percent.
Wind (20 ft)........Northwest winds 5 to 6 mph early in the evening
                    becoming light, then becoming west 5 to 7 mph
                    overnight. Gusty and erratic winds expected
                    near thunderstorms in the evening.
Mixing height.......900 ft AGL decreasing to 400 ft AGL early in
                    the evening.
Transport winds.....Northwest 6 to 12 mph.
Dispersion index....33 decreasing to 3.
LVORI...............1 increasing to 6.

TIME (EDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
Sky (%).........31     32     30     27     17     10
Weather cov.....S CHC  S CHC  S CHC
Weather type....RNSHWR RNSHWR RNSHWR NONE   NONE   NONE
Tstm cov........S CHC  S CHC  S CHC
Chc of pcpn (%).20     20     20     0      0      0
Temp............93     87     83     80     79     79
RH..............54     68     80     88     91     91
20 ft wind......W 6    W 3    N 3    W 3    W 5    W 6
20 ft wind gust.12     9      9      8      13     13
Mix hgt (ft)....2700   500    400    400    400    400
Transport wind..NW 10  NW 8   N 8    NW 6   W 7    W 9
Dispersion idx..33     4      4      3      3      4
LVORI...........1      3      4      5      6      6

.WEDNESDAY...

Sky/weather.........Sunny (15-25 percent). Chance of showers and
                    thunderstorms late in the afternoon.
Chance of pcpn......40 percent.
Max temperature.....Around 95.
Min humidity........60 percent.
Wind (20 ft)........West winds 5 to 7 mph. Gusty and erratic winds
                    expected near thunderstorms late in the
                    afternoon.
Mixing height.......2100 ft AGL increasing to 3500 ft AGL late in
                    the morning.
Transport winds.....West 6 to 8 mph.
Dispersion index....4 increasing to 26.
LVORI...............8 decreasing to 2.

TIME (EDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
Sky (%).........9      7      6      9      30     31
Weather cov.....                            CHANCE CHANCE
Weather type....NONE   NONE   NONE   NONE   RNSHWR RNSHWR
Tstm cov........                            CHANCE CHANCE
Chc of pcpn (%).0      0      0      10     30     40
Temp............78     79     87     90     93     93
RH..............97     100    77     70     62     60
20 ft wind......NW 6   W 6    NW 6   W 7    W 6    W 5
20 ft wind gust.12     10     10     12     12     10
Mix hgt (ft)....400    700    2100   2900   3500   3200
Transport wind..NW 8   NW 7   NW 8   W 7    W 6    W 7
Dispersion idx..4      7      22     24     24     26
LVORI...........8      8      3      3      2      2

$$
Forecaster...Tollefsen
Requested by...James Schuette
Type of request...PRESCRIBED
.TAG 2619858.0/MLB
.DELDT 08/18/26
.FormatterVersion 2.0.0
.EMAIL jschuett@sfwmd.gov