911
FNUS73 KFSD 221148
FWSFSD
SPOT FORECAST FOR LAKE FIRE...USWFS-YANKTON AGENCY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
648 AM CDT WED APR 22 2026
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM CDT THIS
EVENING...
DISCUSSION
ISSUED AT 648 AM CDT WED APR 22 2026
HEADING INTO SOUTHCENTRAL SD, CRITICAL FIRE DANGER IS EXPECTED
TODAY. AS MIXING INCREASES JUST AFTER DAYBREAK, SMOKE DISPERSAL
WILL GRADUALLY IMPROVE. SOUTHEASTERLY SURFACE WINDS WILL BECOME
MORE SOUTHERLY AND INCREASE FROM MID-MORNING ONWARDS WITH WIND
GUSTS BETWEEN 35-45 MPH POSSIBLE THROUGH THIS EVENING. SIMILAR TO
PREVIOUS DAYS, AS TEMPERATURES INCREASE WITH DEEPER MIXING LOWER
DEW POINTS WILL LEAD TO CRITICAL RELATIVE HUMIDITY VALUES (RH) IN
THE 16-20 PERCENT WITH THE DRIEST CONDITIONS BETWEEN 3PM TO 6PM.
LASTLY, WITH THE HEIGHTENED POTENTIAL FOR FIRE SPREAD TODAY; ANY
OUTDOOR BURNING SHOULD BE AVOIDED.
TODAY
MAX TEMPERATURE.....AROUND 92.
MIN HUMIDITY........16 PERCENT.
TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......MCR MCR PC MCR MCR MCR MCR MCR PC PC PC
SKY (%).........15 25 26 25 13 10 8 16 33 38 40
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............66 68 71 73 79 84 88 90 92 91 91
DEWPOINT........52 52 51 51 51 50 47 45 39 39 40
RH..............61 55 50 46 38 31 24 21 16 16 17
20 FT WIND DIR..S S S S S S S S S S S
20 FT WIND SPD..13 14 16 17 21 23 24 28 29 30 31
20 FT WIND GUST.16 20 23 25 28 31 33 37 40 41 43
MIX HGT (KFT)...0.5 0.5 1.2 1.6 2.2 2.9 4.0 5.5 7.0 7.2 6.5
TRANSP WIND DIR.S S S SSW S S S S S S S
TRANSP WIND SPD.15 15 22 23 24 25 30 31 36 38 39
SMOKE DISPERSAL.PR PR FR GD GD EX EX EX EX EX EX
TONIGHT
MIN TEMPERATURE.....AROUND 58.
MAX HUMIDITY........78 PERCENT.
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......PC MC MC MC MC MC MC MC MC MC MC MC
SKY (%).........42 63 75 79 68 59 60 69 83 87 81 65
WEATHER COV..... CHC LKY LKY LKY CHC SCH
WEATHER TYPE.... RW RW RW RW RW RW
TSTM COV........ SCH CHC CHC CHC
CHC OF PCPN (%).0 0 0 0 10 10 30 60 60 60 30 20
CHC OF THDR (%).0 0 0 0 10 10 20 40 40 40 10 10
TEMP............89 86 82 77 75 73 70 67 65 64 62 61
DEWPOINT........40 41 43 46 48 50 52 53 55 56 55 49
RH..............18 21 25 33 38 44 53 61 70 75 78 65
20 FT WIND DIR..S S S S S S S S SSW SSW SW S
20 FT WIND SPD..30 29 29 29 28 28 26 24 22 20 17 15
20 FT WIND GUST.44 40 39 39 38 38 37 35 32 28 24 22
MIX HGT (KFT)...5.5 3.1 1.3 0.8 0.9 0.9 0.9 1.0 1.1 1.3 1.1 1.1
TRANSP WIND DIR.S S S S S S S S S S S SSW
TRANSP WIND SPD.40 37 30 29 28 29 28 28 26 23 20 20
SMOKE DISPERSAL.EX EX GD FR FR FR FR FR FR FR FR FR
THURSDAY
MAX TEMPERATURE.....AROUND 76.
MIN HUMIDITY........16 PERCENT.
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......MC MC MC MC MC MC MC PC PC PC MC MC
SKY (%).........69 73 82 83 68 57 57 46 45 43 54 60
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).10 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).10 0 0 0 0 0 0 0 0 0 0 0
TEMP............59 58 60 63 66 68 71 73 74 74 75 73
DEWPOINT........51 41 39 34 30 29 27 26 26 26 26 27
RH..............75 53 46 34 26 23 20 17 17 17 16 18
20 FT WIND DIR..S SSW SW WSW W W W W W W W W
20 FT WIND SPD..14 13 14 15 16 17 18 18 18 20 20 20
20 FT WIND GUST.20 17 20 21 23 24 25 25 26 28 28 29
MIX HGT (KFT)...0.9 0.7 1.0 1.9 2.9 3.9 4.8 5.7 6.3 7.0 7.6 6.9
TRANSP WIND DIR.SSW S WSW W WNW WNW W W W W W WNW
TRANSP WIND SPD.16 14 14 16 20 21 20 20 20 21 21 21
SMOKE DISPERSAL.PR PR PR FR GD EX EX EX EX EX EX EX
FORECASTER...IG
REQUESTED BY...DUWAYNE TRAVERSIE
TYPE OF REQUEST...WILDFIRE
.TAG 2610682.4/FSD
.DELDT 04/22/26
.FORMATTERVERSION 2.0.0
.EMAIL DUWAYNE.TRAVERSIE@BIA.GOV
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