401
FNUS73 KFSD 041138
FWSFSD
SPOT FORECAST FOR WATERMAN PRAIRIE - STAMMER...IOWA DNR
NATIONAL WEATHER SERVICE SIOUX FALLS SD
638 AM CDT MON MAY 4 2026
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
CHANGING WIND DIRECTIONS AND OCCASIONAL GUSTINESS WILL BE THE
PRIMARY CHALLENGES TODAY. CONFIDENCE IN THE FRONTAL TIMING IS
MODERATE (50-60%), WITH A POTENTIAL FOR EARLIER ARRIVAL OR A
MORE RAPID CHANGE IN WIND DIRECTION WITH FRONTAL PASSAGE.
A COOL FRONT WILL DROP SOUTH THROUGH THE REGION TODAY, TURNING
WEST-SOUTHWEST WINDS THIS MORNING TO THE NORTH WITH THE FRONTAL
PASSAGE. GUSTS IN ADVANCE OF THE FRONT MAY BE SOMEWHAT SPORADIC,
BUT AFTER WINDS SWING TO THE NORTH, MORE CONSISTENT GUSTS UP TO
30 MPH ARE EXPECTED THIS AFTERNOON. IF SPRINKLES OR LIGHT RAIN
SHOWERS DEVELOP ALONG AND BEHIND THE FRONT, ISOLATED STRONGER
GUSTS OF 40 TO 45 MPH WILL BE POSSIBLE, THOUGH THE PROBABILITY
OF THIS OCCURRING IS LOW (<15%).
NORTHERLY WINDS DECREASE AFTER SUNSET AND THE DIRECTION BY EARLY
TUESDAY MAY BE VARIABLE AT TIMES. HOWEVER, MIXING SHOULD HELP
WINDS SETTLE OUT TO NORTHWEST BY MIDDAY WITH OCCASIONAL GUSTS
TO AROUND 20 MPH TUESDAY AFTERNOON.
REST OF TODAY
MAX TEMPERATURE.....AROUND 71.
MIN HUMIDITY........30 PERCENT.
TIME (CDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......MCR MCR MCR MCR MCR PC PC MC MC
SKY (%).........22 20 19 19 18 29 40 51 65
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 10 10
CHC OF THDR (%).0 0 0 0 20 20 20 10 10
TEMP............61 66 68 69 70 70 70 68 66
DEWPOINT........41 42 43 43 42 40 38 36 34
RH..............48 42 40 39 36 34 31 31 30
20 FT WIND DIR..W W NW NNW NNW NNW NW NW NW
20 FT WIND SPD..14 16 17 18 18 20 21 21 22
20 FT WIND GUST.26 24 24 24 24 25 28 30 29
MIX HGT (KFT)...1.4 2.3 4.0 4.9 5.5 6.1 6.6 6.6 6.1
TRANSP WIND DIR.WSW W WNW NW NNW NNW NW NW NW
TRANSP WIND SPD.24 26 23 21 22 23 24 25 25
SMOKE DISPERSAL.GD GD EX EX EX EX EX EX EX
TONIGHT
MIN TEMPERATURE.....AROUND 38.
MAX HUMIDITY........67 PERCENT.
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......MC CDY CDY CDY CDY MC MC MC MC PC PC MC
SKY (%).........79 93 92 91 90 78 67 56 53 50 47 51
WEATHER COV.....ISO ISO ISO ISO
WEATHER TYPE....RW RW RW RW
TSTM COV........
CHC OF PCPN (%).10 10 10 10 10 10 10 10 10 10 10 10
CHC OF THDR (%).10 M M M M M M M M M M M
TEMP............62 60 57 54 51 49 48 45 44 42 40 40
DEWPOINT........33 32 31 30 29 29 29 29 29 28 28 28
RH..............34 35 37 40 42 46 47 53 55 57 62 62
20 FT WIND DIR..NNW NW NW NW NW NNW NNW N N N N N
20 FT WIND SPD..21 17 15 13 10 9 8 7 6 6 6 6
20 FT WIND GUST.28 28 24 21 16 15 13 12 10 9 9 9
MIX HGT (KFT)...5.2 4.7 2.6 1.4 1.0 0.9 0.8 0.8 0.6 0.6 0.6 0.9
TRANSP WIND DIR.NW NNW NW NNW NNW NNW N N N N N N
TRANSP WIND SPD.26 24 22 18 17 16 13 10 10 13 14 10
SMOKE DISPERSAL.EX EX GD FR FR PR PR PR PR PR PR PR
TUESDAY
MAX TEMPERATURE.....AROUND 57.
MIN HUMIDITY........27 PERCENT.
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......MC MC MC MC MC MC MC MC MC MC MC MC
SKY (%).........54 58 60 62 64 64 63 63 63 64 64 67
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).10 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).M M M M M M M M M M M M
TEMP............39 38 41 44 47 50 52 54 55 56 57 56
DEWPOINT........27 28 27 27 27 27 26 25 24 24 23 23
RH..............62 67 57 51 45 41 36 32 30 29 27 28
20 FT WIND DIR..N N N N N NNW NNW NW NW NW NW NW
20 FT WIND SPD..6 6 6 7 8 9 12 13 14 15 15 15
20 FT WIND GUST.8 9 9 10 13 15 17 18 20 21 21 21
MIX HGT (KFT)...0.8 0.8 2.4 4.0 5.4 6.4 7.0 7.5 8.0 8.4 8.6 8.8
TRANSP WIND DIR.N N N N NNW NNW NW NW NW WNW WNW WNW
TRANSP WIND SPD.10 8 9 12 14 15 16 17 18 20 20 20
SMOKE DISPERSAL.PR PR FR GD EX EX EX EX EX EX EX EX
FORECASTER...JH
REQUESTED BY...STEVEN BURKETT
TYPE OF REQUEST...PRESCRIBED
.TAG 2612603.0/FSD
.DELDT 05/04/26
.FORMATTERVERSION 2.0.0
.EMAIL STEVEN.BURKETT@DNR.IOWA.GOV
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