923
FNUS73 KFSD 180043
FWSFSD
SPOT FORECAST FOR SWAMP FIRE...VERMILLION FIRE
NATIONAL WEATHER SERVICE SIOUX FALLS SD
743 PM CDT FRI APR 17 2026
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
WINDS ARE CURRENTLY GUSTING TO AROUND 35 MPH OUT OF THE NORTHWEST.
THESE STRONGER WINDS WILL BE WEAKENING OVER THE NEXT FEW HOURS,
WITH GUSTS DROPPING BELOW 25 MPH BY MIDNIGHT. WINDS WILL PICK UP
ONCE AGAIN HEADING INTO THE DAY ON SATURDAY, GUSTING BACK UP TO 35
MPH BY THE AFTERNOON. WINDS WILL REMAIN OUT OF THE NORTHWEST
TONIGHT THROUGH THE DAY SATURDAY.
RELATIVE HUMIDITY VALUES WILL REMAIN ABOVE CRITICAL LEVELS THROUGH
TONIGHT INTO TOMORROW MORNING, BUT WILL DROP QUICKLY IN THE
AFTERNOON DOWN TO AROUND 20%. FUELS ARE BEGINNING TO GREEN ACROSS
THE AREA, WHICH COULD SLIGHTLY LIMIT THE IMPACTS OF THE LOW
HUMIDITY. TEMPERATURES LOOK TO DROP INTO THE UPPER 20S TONIGHT AND
ONLY RISE TO AROUND 50 DEGREES SATURDAY AFTERNOON UNDER MOSTLY
SUNNY SKIES.
REST OF TONIGHT
MIN TEMPERATURE.....AROUND 28.
MAX HUMIDITY........53 PERCENT.
TIME (CDT) 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......MC MC MC PC PC MCR MCR MCR MCR MCR
SKY (%).........75 80 75 45 27 10 8 9 8 6
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 10 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0
TEMP............48 46 44 42 40 38 36 34 33 32
DEWPOINT........20 20 20 19 17 17 16 16 16 15
RH..............33 35 38 39 39 42 44 47 49 49
20 FT WIND DIR..NW NW NNW NNW NNW NNW NW NW NW NW
20 FT WIND SPD..25 24 22 21 18 16 15 14 14 14
20 FT WIND GUST.35 32 31 29 26 23 23 22 21 20
MIX HGT (KFT)...5.0 3.2 3.1 1.4 1.2 1.2 0.9 0.8 0.7 0.7
TRANSP WIND DIR.NW NW NW NNW NW NNW NW NW NW NW
TRANSP WIND SPD.33 29 26 21 20 16 15 15 14 14
SMOKE DISPERSAL.EX EX EX FR FR FR PR PR PR PR
SATURDAY
MAX TEMPERATURE.....AROUND 54.
MIN HUMIDITY........18 PERCENT.
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......MCR MCR MCR MCR CLR CLR CLR CLR CLR MCR PC PC
SKY (%).........6 6 8 9 5 3 4 5 5 25 40 49
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............30 30 32 36 38 42 45 48 51 52 53 54
DEWPOINT........15 15 14 13 14 13 13 12 12 12 11 11
RH..............53 53 47 38 37 30 27 23 21 20 18 18
20 FT WIND DIR..NW WNW NW NW NW WNW WNW WNW WNW WNW WNW NW
20 FT WIND SPD..14 14 15 18 20 22 23 24 25 26 25 24
20 FT WIND GUST.20 20 22 25 28 30 32 32 35 35 36 35
MIX HGT (KFT)...0.7 0.8 1.7 3.4 4.2 5.0 5.9 7.5 9.0 9.8 10 10
TRANSP WIND DIR.WNW NW NW NW NW NW NW WNW WNW WNW WNW WNW
TRANSP WIND SPD.14 14 18 25 28 29 30 32 33 35 36 36
SMOKE DISPERSAL.PR PR FR EX EX EX EX EX EX EX EX EX
FORECASTER...SAMET
REQUESTED BY...KLUNDER
TYPE OF REQUEST...WILDFIRE
.TAG 2610646.0/FSD
.DELDT 04/17/26
.FORMATTERVERSION 2.0.0
.EMAIL TONYK@CITYOFVERMILLION.COM
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