341
FNAK72 PAFC 211336
FWSALU
SPOT FORECAST FOR FY 2026 KATMAI PILE BURNING...NPS
NATIONAL WEATHER SERVICE ANCHORAGE AK
536 AM AKDT MON SEP 21 2026
FORECAST IS BASED ON IGNITION TIME OF 0700 AKDT ON SEPTEMBER 21.
DISCUSSION
THERE IS A SLIGHT CHANCE (10 TO 20 PERCENT) OF A FEW SHOWERS
TODAY THROUGH TUESDAY. OVERALL, EXPECT MOSTLY DRY CONDITIONS AT
THE BURN SITE. NORTHERLY WINDS OF AROUND 10 MPH TODAY WILL
DIMINISH BELOW 10 MPH BY TUESDAY. HIGH TEMPERATURES WILL BE IN THE
40S OVER THE NEXT FEW DAYS WITH NIGHTTIME LOWS DIPPING INTO THE
LOW 30S. MINIMUM RELATIVE HUMIDITIES ARE EXPECTED TO BE AT OR
ABOVE 50 PERCENT OVER THE NEXT FEW DAYS. LOOKING AHEAD IN THE
FORECAST, A STRONGER STORM SYSTEM WILL APPROACH THE AREA FROM THE
BERING SEA AND BRING RAIN AND GUSTY WINDS POSSIBLY AS SOON AS
THURSDAY. HOWEVER, CONFIDENCE IS LOW ON THE EXACT TRACK AND
EVOLUTION OF THIS STORM AT THIS TIME.
TODAY
SKY/WEATHER.........CLOUDY (85-95 PERCENT). ISOLATED RAIN SHOWERS
THROUGH THE DAY.
CWR.................0 PERCENT.
CHANCE OF PCPN......20 PERCENT.
MAX TEMPERATURE.....AROUND 43.
MIN HUMIDITY........74 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 7 TO 9 MPH.
MIXING HEIGHT.......2100 FT AGL.
TRANSPORT WINDS.....NORTH 14 TO 17 MPH.
PCPN AMOUNT.........0.00 INCHES.
SNOWFALL AMOUNT.....0.0 INCHES.
TIME (AKDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........89 89 89 89 89 89 86 86 86 86 86
WEATHER COV.....ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO ISO
WEATHER TYPE....RS RS RS RS RS RS RW RW RW RW RW
CWR.............0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).20 20 20 20 20 20 20 20 20 20 20
TEMP............36 35 35 36 37 39 40 41 42 43 43
RH..............87 88 88 87 86 83 80 78 76 75 74
20 FT WIND DIR..NW NW NW NW NW NW NW NW NW NW NW
20 FT WIND SPD..7 7 7 8 8 8 8 8 8 9 9
20 FT WIND GUST.8 8 8 13 13 13 13 13 13 14 14
MIX HGT (KFT)...0.9 0.9 0.9 1.9 1.9 1.9 1.9 1.9 1.9 2.1 2.1
TRANSP WIND DIR.N N N N N N N N N N N
TRANSP WIND SPD.14 14 14 16 16 16 16 16 16 17 17
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). ISOLATED RAIN
SHOWERS EARLY IN THE EVENING, THEN SCATTERED
RAIN SHOWERS EARLY IN THE EVENING. ISOLATED
RAIN SHOWERS LATE IN THE EVENING.
CWR.................0 PERCENT.
CHANCE OF PCPN......30 PERCENT.
MIN TEMPERATURE.....AROUND 33.
MAX HUMIDITY........89 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 6 TO 9 MPH.
MIXING HEIGHT.......700 FT AGL.
TRANSPORT WINDS.....NORTH 12 TO 17 MPH.
PCPN AMOUNT.........0.00 INCHES.
SNOWFALL AMOUNT.....0.0 INCHES.
TIME (AKDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........86 81 81 81 67 67 67 59 59 59 60 60
WEATHER COV.....ISO SCT SCT SCT ISO ISO ISO
WEATHER TYPE....RW RW RW RW RW RW RW
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).20 30 30 30 20 20 20 10 10 10 10 10
TEMP............43 43 42 41 39 39 38 37 37 36 34 34
RH..............73 74 76 79 82 84 84 85 85 86 82 82
20 FT WIND DIR..NW NW NW NW NW NW NW NW NW NW NW NW
20 FT WIND SPD..9 7 7 7 7 7 7 7 7 7 6 6
20 FT WIND GUST.14 10 10 10 10 10 10 10 10 10 9 9
MIX HGT (KFT)...2.1 2.1 2.1 2.1 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7
TRANSP WIND DIR.N N N N N N N N N N N N
TRANSP WIND SPD.17 14 14 14 14 14 14 12 12 12 12 12
TUESDAY
SKY/WEATHER.........PARTLY SUNNY (60-70 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......10 PERCENT.
MAX TEMPERATURE.....AROUND 46.
MIN HUMIDITY........63 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 6 TO 7 MPH.
MIXING HEIGHT.......3300 FT AGL.
TRANSPORT WINDS.....NORTH 10 TO 12 MPH.
PCPN AMOUNT.........0.00 INCHES.
SNOWFALL AMOUNT.....0.0 INCHES.
TIME (AKDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........60 60 60 60 58 58 58 61 61 61 69 69
WEATHER COV.....
WEATHER TYPE....
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).10 10 10 10 10 10 10 10 10 10 10 10
TEMP............34 33 33 34 35 38 40 42 44 45 46 46
RH..............84 86 87 87 85 80 74 69 66 64 63 62
20 FT WIND DIR..NW NW NW NW N N N N N N N N
20 FT WIND SPD..6 6 6 6 6 6 6 7 7 7 6 6
20 FT WIND GUST.9 9 9 9 8 8 8 9 9 9 8 8
MIX HGT (KFT)...0.7 0.7 0.7 0.7 2.1 2.1 2.1 2.1 2.1 2.1 3.3 3.3
TRANSP WIND DIR.N N N N N N N N N N N N
TRANSP WIND SPD.12 10 10 10 12 12 12 12 12 12 10 10
FORECASTER...NELSON
REQUESTED BY...NATHAN GILMORE
TYPE OF REQUEST...PRESCRIBED
.TAG 2622215.0/ALU
.DELDT 09/21/26
.FORMATTERVERSION 2.0.0
.EMAIL NATHAN_GILMORE@NPS.GOV
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