691
FNUS73 KDLH 090852
FWSDLH

Spot Forecast for Big Ben Rx...The Nature Conservancy
National Weather Service Duluth MN
352 AM CDT Thu Oct 9 2025

Forecast is based on ignition time of 0700 CDT on October 09.
If there are questions or concerns with this forecast, or if
conditions become unrepresentative, contact the National
Weather Service in Duluth at 218-729-0653.

.DISCUSSION...

Southerly winds will prevail today at the fire site. Expect temperatures in
the mid-60s and a minimum relative humidity in the mid-40 percent range by
early afternoon today. A band of clouds is forecast to move into the region
late morning today. If this sets up sooner than currently expected
then MinRH today may be higher by 5-10 percent than forecast. Localized
and light rain shower chances build this afternoon after 1500 LT and are
highest 1600-1800 LT. Up to one tenth of an inch of very localized rain
may (20 percent chance) be observed from any passing rain shower. A wind
shift to southwesterly will occur late this evening from 2200-0000 LT, then
further to the northwest 0300-0500 LT tonight. Gusty northwest winds are
forecast Friday with slightly cooler temperatures.


.REST OF TODAY...

Sky/weather.........Mostly sunny (35-45 percent) then becoming
                    mostly cloudy (75-85 percent). Slight chance of
                    rain showers late in the afternoon.
Chance of pcpn......20 percent.
Max temperature.....Around 66.
Min humidity........45 percent.
Wind (20 ft)........South winds 8 to 14 mph with gusts to around 23
                    mph.
Mixing height.......2100 ft AGL increasing to 2600 ft AGL late in
                    the afternoon.
Transport winds.....South 16 to 24 mph increasing to 20 to 26 mph
                    in the afternoon.
Smoke dispersal.....Poor (6700-12200 knot-ft) increasing to fair to
                    good (26800-35800 knot-ft) late in the morning,
                    then increasing to good (48900-56600 knot-ft)
                    late in the afternoon decreasing to fair (28600
                    knot-ft) late in the afternoon.
Pcpn amount.........0.01 inches.

TIME (CDT)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky cover.......MCR MCR PC  PC  PC  MC  MC  MC  MC  CDY MC
Weather cov.....                                    SCH SCH
Weather type....                                    RW  RW
Tstm cov........
Chc of pcpn (%).0   0   0   0   0   0   0   10  10  20  20
Temp............42  44  46  51  54  58  62  64  63  63  62
RH..............69  66  65  53  52  46  44  45  45  47  48
20 FT wind dir..S   S   S   S   S   S   S   S   S   S   S
20 FT wind spd..8   9   10  12  12  13  13  13  13  12  11
20 FT wind gust.18  19  21  22  23  23  23  23  23  23  22
Mix hgt (kft)...0.4 0.6 0.8 1.3 1.5 1.7 2.1 2.6 2.5 2.4 1.7
Transp wind dir.S   S   S   S   S   S   S   S   S   S   S
Transp wind spd.17  16  17  23  23  24  26  25  24  24  20
SDspl kt-ft/10007   8   12  27  30  36  49  57  53  50  29

.TONIGHT...

Sky/weather.........Mostly cloudy (60-70 percent) then becoming
                    partly cloudy (25-35 percent).
Chance of pcpn......10 percent.
Min temperature.....Around 48.
Max humidity........85 percent.
Wind (20 ft)........South winds 6 to 10 mph with gusts to around 20
                    mph shifting to the northwest around 6 mph
                    after 3 am.
Mixing height.......1500 ft AGL.
Transport winds.....South 12 to 20 mph shifting to the west around
                    10 mph overnight, then shifting to the
                    northwest after 3 am.
Smoke dispersal.....Poor to fair (9600-25900 knot-ft) decreasing to
                    poor (4000 knot-ft) late in the evening.
Pcpn amount.........0.00 inches.

TIME (CDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
Sky cover.......MCLDY  MCLDY  MCLDY  MCLDY  PCLDY  MCLEAR
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Chc of pcpn (%).10     10     0      0      0      0
Temp............61     61     60     58     56     55
RH..............53     61     63     72     79     85
20 ft wind......S 10   S 8    S 7    SW 5   W 5    NW 6
20 ft wind gust.20     16     15     12     11     13
Mix hgt (ft)....1500   600    1000   500    400    500
Transport wind..S 20   S 18   S 18   SW 12  W 10   N 14
SDspl kt-ft/100026     10     16     5      4      6

.FRIDAY...

Sky/weather.........Sunny (0-10 percent).
Chance of pcpn......0 percent.
Max temperature.....Around 61.
Min humidity........40 percent.
Wind (20 ft)........Northwest winds 6 to 10 mph. Gusts up to 21 mph
                    in the late morning and early afternoon.
Mixing height.......1900 ft AGL increasing to 4000 ft AGL in the
                    late morning and afternoon.
Transport winds.....North 13 to 22 mph decreasing to 15 to 18 mph
                    late in the afternoon.
Smoke dispersal.....Poor to fair (4900-16100 knot-ft) increasing to
                    good (36400 knot-ft) late in the morning, then
                    increasing to excellent (64300-88200 knot-ft)
                    in the late morning and afternoon decreasing to
                    good (37700 knot-ft) late in the afternoon.
Pcpn amount.........0.00 inches.

TIME (CDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
Sky cover.......MCLEAR CLEAR  CLEAR  CLEAR  MCLEAR MCLEAR
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Chc of pcpn (%).0      0      0      0      0      0
Temp............51     48     53     56     59     60
RH..............83     78     62     48     41     40
20 ft wind......NW 6   NW 7   NW 10  N 10   N 10   N 9
20 ft wind gust.14     14     19     19     18     15
Mix hgt (ft)....500    1100   2900   3800   4000   4000
Transport wind..N 14   N 17   N 26   N 26   N 22   N 18
SDspl kt-ft/10006      16     67     87     75     64

$$
Forecaster...Nathan
Requested by...Bob Bale
Type of request...PRESCRIBED
.TAG 2523216.0/DLH
.DELDT 10/09/25
.FormatterVersion 2.0.0
.EMAIL robert.bale@tnc.org