082
FNUS73 KFSD 131229
FWSFSD
SPOT FORECAST FOR ALLECKSON...FWS
NATIONAL WEATHER SERVICE SIOUX FALLS SD
729 AM CDT WED MAY 13 2026
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
WINDS REMAIN VERY LIGHT AND VARIABLE IN DIRECTION EARLY THIS
MORNING, AND LOCALIZED DIRECTIONS MAY BE HIGHLY DICTATED ON LOCAL
TERRAIN. THERE REMAINS SOME SIGNS THAT SURFACE WINDS THROUGH MID-
LATE MORNING MAY TRY TO TURN TO A PREVAILING WESTERLY, WHILE
TRANSPORT WINDS REMAIN MORE TO THE NORTHWEST.
BY MID-DAY AND EARLY AFTERNOON A SUBTLE SHIFT OF SURFACE WINDS TO
THE NORTHWEST MAY BE POSSIBLE, BUT AGAIN, SPEEDS ARE VERY LIGHT
AND UNDER 10 MPH IN MOST AREAS. RELATIVE HUMIDITY VALUES BOTTOM
OUT IN THE LOW 20 PERCENT RANGE. MIXING HEIGHTS WILL BE FAVORABLE
THIS AFTERNOON UP TO OR AROUND 9000 FT AGL AT PEAK MIXING.
REST OF TODAY
MAX TEMPERATURE.....AROUND 75.
MIN HUMIDITY........23 PERCENT.
TIME (CDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......MCR CLR CLR CLR CLR CLR CLR CLR
SKY (%).........7 3 4 3 2 3 3 2
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0
TEMP............63 67 69 71 72 73 74 74
DEWPOINT........35 35 35 35 35 34 34 34
RH..............35 31 28 27 25 24 23 23
20 FT WIND DIR..NW NW NW NW NW NW NW N
20 FT WIND SPD..3 3 5 5 6 6 6 5
20 FT WIND GUST.7 9 10 12 13 13 13 12
MIX HGT (KFT)...2.5 4.2 6.7 8.4 8.9 9.1 9.0 9.0
TRANSP WIND DIR.N NNW NW NW NW NW NW WNW
TRANSP WIND SPD.7 9 12 13 12 10 10 9
SMOKE DISPERSAL.FR GD EX EX EX EX EX EX
TONIGHT
MIN TEMPERATURE.....AROUND 50.
MAX HUMIDITY........52 PERCENT.
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......CLR CLR MCR MCR MCR PC MCR PC PC MCR PC PC
SKY (%).........3 5 8 12 18 28 18 29 29 25 37 42
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).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............74 74 69 62 59 57 56 55 54 53 53 52
DEWPOINT........34 34 36 33 33 33 33 34 33 33 33 33
RH..............23 23 30 34 37 40 42 45 45 46 46 48
20 FT WIND DIR..NE E E ESE SE SE SSE SSE SSE SSE SSE S
20 FT WIND SPD..5 3 6 8 9 12 13 15 16 17 18 21
20 FT WIND GUST.9 8 9 12 15 18 21 24 24 26 28 30
MIX HGT (KFT)...8.6 7.8 0.5 0.5 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5
TRANSP WIND DIR.WNW W E ESE SE SE SSE SSE SSE SSE S S
TRANSP WIND SPD.7 7 6 10 12 15 18 20 22 22 22 23
SMOKE DISPERSAL.GD GD PR PR PR PR PR PR PR PR PR PR
THURSDAY
MAX TEMPERATURE.....AROUND 78.
MIN HUMIDITY........28 PERCENT.
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......PC MC PC PC PC MC MC MC MC MC MC MC
SKY (%).........38 52 46 39 29 57 72 77 75 68 71 52
WEATHER COV..... CHC CHC CHC
WEATHER TYPE.... RW RW RW
TSTM COV........
CHC OF PCPN (%).0 0 0 0 10 10 10 30 30 30 10 0
CHC OF THDR (%).0 0 0 0 10 10 10 10 10 10 10 0
TEMP............50 51 55 59 65 70 72 73 76 77 77 78
DEWPOINT........33 34 35 37 38 38 39 40 41 43 44 45
RH..............52 52 47 44 37 31 30 30 28 30 31 31
20 FT WIND DIR..S S S S S S S S S S S SSW
20 FT WIND SPD..22 23 26 29 31 33 33 33 32 31 29 28
20 FT WIND GUST.31 32 36 38 40 43 41 41 40 39 36 35
MIX HGT (KFT)...0.6 0.6 1.1 1.8 2.4 3.0 3.2 4.0 5.5 5.5 5.4 6.4
TRANSP WIND DIR.S S S S S S S S S SSW SSW SSW
TRANSP WIND SPD.23 26 31 39 43 46 46 48 48 46 41 43
SMOKE DISPERSAL.PR FR FR EX EX EX EX EX EX EX EX EX
FORECASTER...DUX
REQUESTED BY...MILLETTE
TYPE OF REQUEST...PRESCRIBED
.TAG 2613534.0/FSD
.DELDT 05/13/26
.FORMATTERVERSION 2.0.0
.EMAIL PHIL_MILLETTE@FWS.GOV
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