139
FNUS73 KFSD 281517
FWSFSD
SPOT FORECAST FOR COTTONWOOD WPA...U.S. FISH & WILDLIFE
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1017 AM CDT TUE APR 28 2026
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
PER OUR CONVERSATIONS, THE INCREASE IN WEST NORTHWEST WINDS
WEDNESDAY AFTERNOON COMBINED WITH MIXING HEIGHTS AROUND 5-7K FT
AGL, SHOULD LEAD TO GOOD TO EXCELLENT DISPERSION.
WEDNESDAY
MAX TEMPERATURE.....AROUND 56.
MIN HUMIDITY........42 PERCENT.
TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......PC PC PC MCR MCR PC PC MC PC MC PC
SKY (%).........43 26 32 23 21 33 29 55 47 51 49
WEATHER COV..... SCH SCH
WEATHER TYPE.... RW RW
TSTM COV........
CHC OF PCPN (%).0 0 0 0 10 10 10 10 20 20 10
CHC OF THDR (%).M M M M M M M M M M M
TEMP............36 39 42 47 49 52 54 54 56 54 54
DEWPOINT........33 34 34 34 34 33 32 33 33 32 33
RH..............87 82 72 60 56 48 44 44 42 42 44
20 FT WIND DIR..W W W WNW WNW WNW WNW WNW WNW NW NW
20 FT WIND SPD..3 3 5 6 8 9 10 12 12 12 12
20 FT WIND GUST.7 8 10 10 14 15 16 17 17 17 17
MIX HGT (KFT)...0.5 1.1 2.0 3.7 5.5 6.6 7.0 7.4 7.8 7.7 6.5
TRANSP WIND DIR.NNW WNW WNW WNW WNW WNW WNW WNW WNW WNW NW
TRANSP WIND SPD.6 7 7 10 12 15 16 16 18 20 16
SMOKE DISPERSAL.PR PR PR GD GD EX EX EX EX EX EX
WEDNESDAY NIGHT
MIN TEMPERATURE.....AROUND 34.
MAX HUMIDITY........84 PERCENT.
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY COVER.......PCLDY PCLDY PCLDY PCLDY PCLDY PCLDY
SKY (%).........42 44 42 37 38 45
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).10 10 10 10 10 10
CHC OF THDR (%).M M M M M M
TEMP............54 49 43 40 38 36
DEWPOINT........33 35 34 33 32 31
RH..............44 58 70 75 79 83
20 FT WIND......NNW 12 N 8 NNW 6 N 6 N 6 N 6
20 FT WIND GUST.16 14 12 10 10 10
MIX HGT (FT)....5800 1300 400 400 700 700
TRANSPORT WIND..NNW 15 N 8 N 7 NNE 9 NNE 10 N 9
SMOKE DISPERSAL.EXCEL POOR POOR POOR POOR POOR
THURSDAY
MAX TEMPERATURE.....AROUND 51.
MIN HUMIDITY........38 PERCENT.
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
SKY COVER.......PCLDY PCLDY PCLDY PCLDY PCLDY PCLDY
SKY (%).........42 40 40 31 34 49
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CHC OF PCPN (%).10 10 10 10 10 10
CHC OF THDR (%).M M M M M M
TEMP............34 36 42 47 50 51
DEWPOINT........30 29 29 28 28 27
RH..............84 74 60 49 42 39
20 FT WIND......N 6 N 7 N 10 NNW 13 NNW 15 NNW 15
20 FT WIND GUST.10 13 15 18 20 20
MIX HGT (FT)....300 1500 4000 5800 6900 7200
TRANSPORT WIND..N 8 N 12 NNW 16 NNW 18 NNW 21 NNW 21
SMOKE DISPERSAL.POOR FAIR GOOD EXCEL EXCEL EXCEL
FORECASTER...DUX
REQUESTED BY...JIMMY CORBETT
TYPE OF REQUEST...PRESCRIBED
.TAG 2611940.0/FSD
.DELDT 04/29/26
.FORMATTERVERSION 2.0.0
.EMAIL JAMES_CORBETT@FWS.GOV,RYAN_WILLIAMS@FWS.GOV
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