Spot Forecast
Issued by NWS Portland, ME
Issued by NWS Portland, ME
448
FNUS71 KGYX 181224
FWSGYX
Spot Forecast for Rattlesnake...NH-NECC
National Weather Service Gray ME
824 AM EDT Tue Aug 18 2026
Forecast is based on forecast start time of 0900 EDT on August 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.
Today will start muggy and humid, with temperatures currently in
the mid-60s at the wildfire site. Overcast skies will continue
through a decent part of the morning, but conditions should start
to clear out in the second half of the day. Light and variable winds
are expected through the day at the wildfire site. RH will bottom out
at around 60% around 4-5pm this afternoon. Isolated showers are
possible this morning, with a slight chance to see a thunderstorm
in the afternoon. Patchy fog looks to build in overnight, with no
rain chances. Low temperatures in the mid-50s expected.
.REST OF TODAY...
Sky/weather.........Partly sunny (50-60 percent). Patchy fog late
in the morning. Chance of showers late in the
morning, then slight chance of showers and
thunderstorms in the afternoon.
CWR.................0 percent.
Chance of thunder...20 percent.
Max temperature.....Around 77.
Min humidity........60 percent.
Dewpoint............63.
Max apparent temp...76.
Wind (20 ft)........Light winds. Erratic winds expected near
thunderstorms in the afternoon.
Mixing height.......5000 ft AGL.
Transport winds.....East around 3 mph shifting to the northwest 3
to 5 mph in the late morning and early afternoon,
then increasing to 6 to 7 mph late in the afternoon.
Smoke dispersal.....Poor (3900 knot-ft) early in the morning increasing
to good (30100 knot-ft) in the afternoon.
LVORI...............4.
ADI.................13 increasing to 42. CEILING (KFT).......0.8
increasing to 11.
TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........59 54 55 60 66 55 47 45 39
Weather cov.....CHC CHC CHC SCH SCH SCH SCH SCH SCH
Weather type....RW RW RW RW RW RW RW RW RW
Tstm cov........NO NO NO SCH SCH SCH SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 0
Chc of thdr (%).10 10 10 10 10 20 20 20 10
Temp............70 72 73 74 75 76 76 76 76
Dewpoint........64 65 65 64 64 63 62 61 61
RH..............87 81 76 71 69 64 62 60 60
Aparnt tmp (F)..68 71 73 74 75 76 76 76 76
20 FT wind dir..SE E E NE NW W W NW NW
20 FT wind spd..1 1 1 1 1 1 1 1 1
20 FT wind gust.2 2 2 2 2 2 2 2 2
Mix hgt (kft)...1.3 1.8 2.4 2.8 3.2 3.9 4.6 5.0 4.5
Transp wind dir.E N NW NW NW NW W NW NW
Transp wind spd.3 3 5 5 5 6 7 7 7
LVORI...........6 5 4 3 3 3 2 1 1
ADI.............8 9 14 17 22 23 30 41 43
Vrate kt-ft/1K..4 6 10 11 13 20 28 30 27
Ventrate Cat....PR PR PR PR PR PR PR PR PR
Ceiling (kft)...0.8 1.2 1.8 2.1 2.4 3.3 4.4 7.4 11
.TONIGHT...
Sky/weather.........Partly cloudy (35-45 percent) then becoming
mostly cloudy (50-60 percent). Patchy fog late
in the evening.
CWR.................0 percent.
Chance of thunder...9 percent.
Min temperature.....Around 55.
Max humidity........100 percent.
Dewpoint............60 decreasing to 56 after 3 am.
Max apparent temp...75.
Wind (20 ft)........Light winds.
Mixing height.......400 ft AGL.
Transport winds.....Northwest 5 to 7 mph.
Smoke dispersal.....Fair (21500 knot-ft) early in the evening
decreasing to poor (1700 knot-ft) late in the
night.
LVORI...............6.
ADI.................26 decreasing to 5.
CEILING (KFT).......12 increasing to 15 early in the evening, then
increasing to 20 early in the evening
increasing to 24 late in the evening decreasing
to 17 decreasing to 1.7 overnight decreasing to
0.8 decreasing to 0.5 after 3 am decreasing to
0.4 decreasing to 0.2 early in the morning.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........33 34 41 29 44 46 44 46 52 55 59 52
Weather cov..... PTY PTY PTY
Weather type.... FOG FOG FOG
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 (%).10 10 0 0 0 0 0 0 0 0 0 0
Temp............75 73 70 64 62 61 60 59 58 57 57 56
Dewpoint........61 62 62 62 61 60 60 59 58 57 56 56
RH..............62 68 76 93 97 97 100 100 100 100 96 100
Aparnt tmp (F)..75 73 70 64 62 61 60 59 58 57 57 56
20 FT wind dir..NW N N N N N N NW NW NW NW NW
20 FT wind spd..1 0 0 0 0 0 0 1 1 1 1 1
20 FT wind gust. 1 1 2 2 2 2
Mix hgt (kft)...3.6 0.6 0.4 0.4 0.5 0.5 0.4 0.4 0.4 0.4 0.4 0.4
Transp wind dir.NW N N N N N N N NW NW NW NW
Transp wind spd.7 6 5 5 6 6 6 5 5 5 5 5
LVORI...........2 3 4 6 8 8 9 9 9 9 10 10
ADI.............26 7 3 3 3 3 3 3 3 3 2 2
Vrate kt-ft/1K..22 3 2 2 2 2 2 2 2 2 2 2
Ventrate Cat....PR PR PR PR PR PR PR PR PR PR PR PR
Ceiling (kft)...12 15 20 21 24 17 19 1.7 0.8 0.5 0.4 0.2
.WEDNESDAY...
Sky/weather.........Mostly sunny (35-45 percent).
CWR.................0 percent.
Chance of thunder...2 percent.
Max temperature.....Around 80.
Min humidity........41 percent.
Dewpoint............57 decreasing to 54 late in the afternoon.
Max apparent temp...80.
Wind (20 ft)........Light winds.
Mixing height.......5000 ft AGL.
Transport winds.....West 5 to 13 mph.
Smoke dispersal.....Poor (1600 knot-ft) early in the morning
increasing to good (50500 knot-ft) in the
afternoon.
LVORI...............9 early in the morning.
ADI.................5 early in the morning.
CEILING (KFT).......0.4 increasing to 0.5 early in the morning,
then increasing to 0.7 early in the morning
increasing to 3.8 late in the morning
increasing to 7.0 increasing to 10 late in the
morning decreasing to 8.8 decreasing to 7.5
early in the afternoon decreasing to 6.2
increasing to 7.5 late in the afternoon.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........52 31 35 19 22 33 56 50 65 35 28 19
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............55 56 59 64 70 74 76 78 79 79 80 78
Dewpoint........55 56 58 59 59 57 56 56 55 54 54 55
RH..............100 100 96 84 68 55 50 47 44 42 41 45
Aparnt tmp (F)..55 56 59 64 70 74 76 78 79 79 80 78
20 FT wind dir..NW NW NW W W W W W W W W W
20 FT wind spd..1 1 1 1 2 2 2 3 3 3 5 5
20 FT wind gust.2 2 2 3 5 5 6 7 7 8 9 9
Mix hgt (kft)...0.4 0.4 0.6 1.6 2.8 4.0 4.5 4.8 5.0 3.5 4.0 4.1
Transp wind dir.NW W W W W W W W W W W W
Transp wind spd.5 5 6 6 7 7 10 12 12 12 13 13
LVORI...........9 9 M M M M M M M M M M
ADI.............4 6 M M M M M M M M M M
Vrate kt-ft/1K..2 2 3 8 17 24 40 48 51 35 44 45
Ventrate Cat....PR PR PR PR PR PR FR FR FR PR FR FR
Ceiling (kft)...0.4 0.5 0.7 3.8 7.0 10 8.8 7.5 6.2 6.8 7.5 8.1
$$
Forecaster...PALMER
Requested by...GARETH WEAVER
Type of request...WILDFIRE
.TAG 2619910.0/GYX
.DELDT 08/18/26
.FormatterVersion 2.0.0
.EMAIL nhnecc@firenet.gov