936
FNUS73 KFSD 190944
FWSFSD
SPOT FORECAST FOR LAKE FIRE...USWFS-YANKTON AGENCY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
444 AM CDT SUN APR 19 2026
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
LOOKING INTO SOUTHCENTRAL SD, AFTER A FEW SPRINKLES THIS MORNING;
MORE MILD AND DRY CONDITIONS ARE AHEAD. AS MIXING RESUMES AFTER
DAYBREAK, SMOKE DISPERSAL WILL GRADUALLY IMPROVE AS TEMPERATURES
LIKELY PEAK IN THE MID TO UPPER 50S FOR THE DAY. DEW POINTS WILL
GRADUALLY DECREASE INTO THE AFTERNOON LEADING TO RELATIVE HUMIDITY
VALUES IN THE 20-30 PERCENT RANGE. OTHERWISE, LIGHT NORTHWEST
WINDS THIS MORNING WILL BECOME MORE NORTHERLY INTO THE EARLY
AFTERNOON WITH THE POTENTIAL FOR GUSTS AROUND 10-15 MPH.
LOOKING AHEAD, MORE ELEVATED FIRE CONCERNS WILL RETURN BY MONDAY
AS BREEZY SOUTHERLY WINDS RETURN WITH GUSTS BETWEEN 25-35 MPH.
THIS COMBINED WITH WARMER TEMPERATURES AND DEW POINTS IN THE 18-22
PERCENT RANGE WILL LEAD TO HIGH FIRE DANGER.
TODAY
MAX TEMPERATURE.....AROUND 56.
MIN HUMIDITY........28 PERCENT.
TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......PC MC PC PC PC PC MCR MCR PC MCR MCR
SKY (%).........50 54 43 32 28 32 23 21 26 22 13
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).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
TEMP............31 35 38 43 45 48 50 53 54 55 56
DEWPOINT........20 21 24 26 26 26 26 26 25 24 24
RH..............62 57 57 51 47 42 39 35 32 30 29
20 FT WIND DIR..NW NNW N NNE NNE N N N N N N
20 FT WIND SPD..9 9 10 10 10 10 10 10 10 9 9
20 FT WIND GUST.13 14 14 15 16 16 16 15 15 14 14
MIX HGT (KFT)...0.4 0.5 1.6 2.1 2.8 3.4 3.9 4.5 4.9 5.0 4.9
TRANSP WIND DIR.NNW N N N N N N N N N N
TRANSP WIND SPD.10 9 14 14 14 14 12 13 12 10 9
SMOKE DISPERSAL.PR PR FR FR GD GD GD GD GD GD GD
TONIGHT
MIN TEMPERATURE.....AROUND 32.
MAX HUMIDITY........53 PERCENT.
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......MCR MCR MCR MCR MCR MCR MCR MCR MCR MCR MCR MCR
SKY (%).........12 13 16 16 12 11 8 7 8 10 9 11
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............56 55 52 47 43 41 39 37 36 35 33 34
DEWPOINT........23 23 22 20 18 17 16 15 15 15 15 16
RH..............28 28 30 34 36 37 39 40 42 43 47 48
20 FT WIND DIR..NNE NE ENE ENE E E ESE ESE SE SE SSE SSE
20 FT WIND SPD..9 9 9 9 10 10 9 10 10 10 10 10
20 FT WIND GUST.13 12 12 13 14 14 14 14 14 15 15 15
MIX HGT (KFT)...4.7 4.2 0.5 0.5 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5
TRANSP WIND DIR.N NNE ENE ENE E E E ESE SE SSE SSE SSE
TRANSP WIND SPD.8 9 9 12 12 12 13 15 16 15 14 15
SMOKE DISPERSAL.GD GD PR PR PR PR PR PR PR PR PR PR
MONDAY
MAX TEMPERATURE.....AROUND 79.
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 PC PC PC PC MC PC
SKY (%).........8 9 13 11 13 19 26 32 38 45 51 43
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............33 32 36 41 49 55 60 65 70 74 77 79
DEWPOINT........16 17 20 23 26 29 31 32 33 34 34 34
RH..............50 53 52 48 40 37 33 29 25 23 21 20
20 FT WIND DIR..SSE SSE SSE SSE S S S S S S S S
20 FT WIND SPD..10 10 13 15 17 18 18 18 18 17 16 15
20 FT WIND GUST.16 17 20 22 24 25 25 25 25 25 24 23
MIX HGT (KFT)...0.5 0.5 0.7 1.4 1.9 2.4 2.8 3.1 3.4 3.7 4.1 3.2
TRANSP WIND DIR.S S S S S S S S S SSW SSW SSW
TRANSP WIND SPD.15 13 16 22 25 24 24 24 23 23 24 24
SMOKE DISPERSAL.PR PR PR FR GD GD GD EX EX EX EX EX
FORECASTER...IG
REQUESTED BY...DUWAYNE TRAVERSIE
TYPE OF REQUEST...WILDFIRE
.TAG 2610682.1/FSD
.DELDT 04/19/26
.FORMATTERVERSION 2.0.0
.EMAIL DUWAYNE.TRAVERSIE@BIA.GOV
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