Spot Forecast
Issued by NWS Portland, ME
Issued by NWS Portland, ME
867
FNUS71 KGYX 181005
FWSGYX
Spot Forecast for Kennebec Highlands Vienna Mountain...Maine Forest Service
National Weather Service Gray ME
605 AM EDT Fri Sep 18 2026
Forecast is based on ignition time of 0800 EDT on September 18.
If conditions become unrepresentative...contact the National Weather
Service.
Please contact our office at (207) 688-3224, if you have questions
or concerns with this forecast.
.DISCUSSION...
Any linger fog and low clouds will quickly clear out this morning
as drier air moves into the area behind a cold front. Northwest
winds will also become breezy with gusts of 20 to 30 mph later
this morning, and these will continue through the afternoon hours.
Favorable mixing heights and brisk transport winds will result in
excellent smoke dispersal, and min RH is expected to reach the
lower 40s this afternoon.
.REST OF TODAY...
Sky/weather.........Sunny (5-15 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 69.
Min humidity........41 percent.
Dewpoint............57 decreasing to 42.
Max apparent temp...68.
Wind (20 ft)........Northwest winds 6 to 12 mph. Gusts up to 28 mph
in the late morning and afternoon.
Mixing height.......5900 ft AGL.
Transport winds.....Northwest 8 to 16 mph increasing to 18 to 23
mph late in the morning.
Smoke dispersal.....Poor (4300 knot-ft) early in the morning
increasing to excellent (94900 knot-ft) in the
afternoon increasing to excellent (81600
knot-ft) in the afternoon.
LVORI...............4.
ADI.................11 increasing to 37 late in the morning, then
increasing to 66 late in the morning increasing
to 83 late in the morning increasing to 101
decreasing to 73 early in the afternoon
increasing to 89.
TIME (EDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........20 12 10 7 16 11 9 7 4 1
Weather cov.....
Weather type....
Tstm cov........NO NO NO NO NO NO NO NO NO NO
CWR.............0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0
Temp............59 61 64 65 68 68 68 68 67 65
Dewpoint........59 57 56 54 52 50 48 45 43 41
RH..............100 87 75 68 57 52 49 43 42 41
Aparnt tmp (F)..59 61 64 65 68 68 68 68 67 65
20 FT wind dir..NW NW NW NW NW NW NW NW NW NW
20 FT wind spd..7 8 10 12 13 13 14 14 13 13
20 FT wind gust.15 17 22 23 25 26 28 28 26 25
Mix hgt (kft)...0.6 1.6 2.8 4.1 5.3 5.8 5.9 5.7 5.2 4.5
Transp wind dir.NW NW NW NW NW NW NW NW NW NW
Transp wind spd.8 13 16 18 21 22 23 23 23 21
LVORI...........7 4 3 1 1 1 1 1 1 1
ADI.............11 37 66 83 100 102 74 72 91 87
Vrate kt-ft/1K..4 18 40 66 95 110 117 114 105 82
Ventrate Cat....PR PR PR GD GD VGD VGD VGD VGD GD
.TONIGHT...
Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 43.
Max humidity........76 percent.
Dewpoint............38 decreasing to 35 overnight.
Min apparent temp...38.
Wind (20 ft)........Northwest winds 7 to 12 mph. Gusts up to 26 mph
in the evening and overnight.
Mixing height.......400 ft AGL.
Transport winds.....North 9 to 16 mph.
Smoke dispersal.....Fair (24400 knot-ft) early in the evening
decreasing to poor (3600 knot-ft) late in the
night.
LVORI...............2.
ADI.................40 decreasing to 9.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........3 2 8 10 21 10 20 6 22 25 33 24
Weather cov.....
Weather type....
Tstm cov........NO NO NO NO NO NO NO NO NO NO NO NO
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............63 57 55 53 52 50 49 48 46 45 44 44
Dewpoint........40 39 38 38 37 37 36 35 35 35 35 35
RH..............43 51 53 57 56 61 61 60 65 68 70 70
Aparnt tmp (F)..63 57 55 53 52 45 44 43 41 40 38 39
20 FT wind dir..NW NW NW NW N N N N N N NW NW
20 FT wind spd..13 13 13 14 14 15 14 13 12 10 10 9
20 FT wind gust.23 23 23 25 25 26 25 23 22 20 17 17
Mix hgt (kft)...1.7 0.7 0.5 0.4 0.5 0.5 0.5 0.6 0.5 0.5 0.4 0.4
Transp wind dir.NW NW NW NW N N N N N N N N
Transp wind spd.16 14 14 14 14 15 14 13 12 10 10 9
LVORI...........1 2 2 2 2 2 2 3 3 3 3 3
ADI.............40 11 11 11 11 11 11 10 8 7 7 6
Vrate kt-ft/1K..24 8 6 5 6 6 7 6 5 4 4 4
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
.SATURDAY...
Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 61.
Min humidity........41 percent.
Dewpoint............36.
Min apparent temp...38.
Wind (20 ft)........North winds 5 to 7 mph in the morning becoming
light.
Mixing height.......5900 ft AGL.
Transport winds.....Northwest 7 to 13 mph.
Smoke dispersal.....Poor (3000 knot-ft) early in the morning
increasing to good (47000 knot-ft) in the
afternoon.
LVORI...............4 early in the morning.
ADI.................8 early in the morning.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........31 3 0 1 2 1 2 2 3 3 3 0
Weather cov.....
Weather type....
Tstm cov........NO NO NO NO NO NO NO NO NO NO NO NO
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............43 43 45 48 51 53 56 58 59 61 61 60
Dewpoint........35 36 37 37 37 36 37 37 37 37 38 38
RH..............73 76 73 65 59 52 49 45 44 41 42 44
Aparnt tmp (F)..38 38 41 45 51 53 56 58 59 61 61 60
20 FT wind dir..NW N N N N N N NW NW NW NW NW
20 FT wind spd..8 8 7 7 6 6 5 5 3 3 2 2
20 FT wind gust.16 16 14 14 12 12 9 9 7 5 5 5
Mix hgt (kft)...0.4 0.5 1.4 2.4 3.1 3.9 4.3 4.8 5.0 5.7 5.9 5.1
Transp wind dir.NW N N N N N N NW NW NW NW NW
Transp wind spd.8 8 12 13 12 12 9 8 8 9 9 7
LVORI...........3 4 M M M M M M M M M M
ADI.............8 8 M M M M M M M M M M
Vrate kt-ft/1K..3 3 14 27 31 39 34 34 35 46 47 31
Ventrate Cat....PR PR PR PR PR PR PR PR PR FR FR PR
$$
Forecaster...COMBS
Requested by...Aliesha Black
Type of request...PRESCRIBED
.TAG 2621857.4/GYX
.DELDT 09/18/26
.FormatterVersion 2.0.0
.EMAIL aliesha.j.black@maine.gov