201
FNUS73 KFSD 211726
FWSFSD
SPOT FORECAST FOR WOODS FIRE...USWFS
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1226 PM CDT TUE APR 21 2026
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
ISSUED AT 1226 PM CDT TUE APR 21 2026
CONDITIONS AT THE WILDFIRE TODAY WILL BE VERY WARM, MOSTLY SUNNY, AND
DRY. THE HIGH TEMPERATURE THIS AFTERNOON WILL PEAK AROUND 85 DEGREES
WITH A MINIMUM RELATIVE HUMIDITY AS LOW AS 15 PERCENT. SURFACE WIND WILL
CONTINUE FROM THE NORTH-NORTHEAST FROM 5 TO 10 MPH WITH OCCASIONAL
GUSTS UP TO 15 MPH. SMOKE DISPERSION WILL BE GOOD. LOOKING AHEAD TO
TONIGHT, WINDS WILL REMAIN LIGHT BUT SHIFT TO THE EAST-SOUTHEAST.
WEDNESDAY WILL BE HOT, DRY, AND WINDY. HIGH TEMPERATURES WILL SOAR
ABOVE 90 DEGREES WITH SOUTHERLY WINDS 20 TO 25 MPH AND GUSTS AS
HIGH AS 40 MPH. AT AFTERNOON PEAK HEATING, RELATIVE HUMIDITY WILL DROP
TO NEAR 15 PERCENT. GIVEN STRONG WINDS, SMOKE DISPERSION WILL BE
EXCELLENT.
REST OF TODAY
MAX TEMPERATURE.....AROUND 85.
MIN HUMIDITY........18 PERCENT.
TIME (CDT) 1PM 2PM 3PM 4PM 5PM
SKY COVER.......MCR MCR CLR MCR MCR
SKY (%).........14 9 4 14 15
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0
TEMP............79 82 84 85 85
DEWPOINT........38 37 37 37 36
RH..............23 20 19 18 18
20 FT WIND DIR..NNE NNE NE ENE E
20 FT WIND SPD..7 7 8 8 8
20 FT WIND GUST.12 13 13 13 13
MIX HGT (KFT)...4.0 4.9 5.7 6.2 6.3
TRANSP WIND DIR.N N NNE NE ENE
TRANSP WIND SPD.10 9 9 8 8
SMOKE DISPERSAL.GD GD GD GD GD
TONIGHT
MIN TEMPERATURE.....AROUND 56.
MAX HUMIDITY........71 PERCENT.
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY COVER.......MCLEAR PCLDY MCLEAR MCLEAR MCLEAR MCLEAR
SKY (%).........20 26 12 8 9 9
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0
TEMP............85 80 69 64 61 58
DEWPOINT........36 38 37 37 39 42
RH..............18 22 31 37 44 55
20 FT WIND......E 8 ESE 8 ESE 8 SE 8 SE 8 SE 8
20 FT WIND GUST.13 13 14 14 15 14
MIX HGT (FT)....5900 500 500 500 500 500
TRANSPORT WIND..ESE 8 ESE 10 ESE 13 SSE 14 SSE 15 SSE 13
SMOKE DISPERSAL.GOOD POOR POOR POOR POOR POOR
WEDNESDAY
MAX TEMPERATURE.....AROUND 90.
MIN HUMIDITY........20 PERCENT.
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......MCR MCR MCR MCR MCR MCR MCR MCR MCR MCR MCR PC
SKY (%).........11 11 23 24 21 18 15 12 22 23 22 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 10 10 10 10 10
TEMP............57 56 60 65 75 81 85 88 90 90 90 89
DEWPOINT........45 47 48 50 49 52 51 48 46 44 44 44
RH..............64 72 64 58 40 37 31 25 22 20 20 21
20 FT WIND DIR..SE SSE SSE S S S S S S S S S
20 FT WIND SPD..7 8 10 13 15 18 21 22 24 25 26 26
20 FT WIND GUST.13 14 16 20 22 25 29 30 33 36 37 37
MIX HGT (KFT)...0.5 0.5 0.6 1.0 1.5 2.2 3.0 4.4 5.3 5.9 6.5 5.5
TRANSP WIND DIR.S SSE S S S S S S S S S S
TRANSP WIND SPD.14 14 15 20 20 21 24 28 33 37 39 39
SMOKE DISPERSAL.PR PR PR FR FR GD EX EX EX EX EX EX
FORECASTER...ROGERS
REQUESTED BY...DUWAYNE TRAVERSIE
TYPE OF REQUEST...WILDFIRE
.TAG 2611191.0/FSD
.DELDT 04/21/26
.FORMATTERVERSION 2.0.0
.EMAIL DUWAYNE.TRAVERSIE@BIA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page