074
FNUS73 KDMX 271308
FWSDMX
SPOT FORECAST FOR CBG - SWITCHGRASS...POLK COUNTY CONSERVATION
NATIONAL WEATHER SERVICE DES MOINES IA
708 AM CST THU FEB 27 2025
FORECAST IS BASED ON IGNITION TIME OF 1200 CST ON FEBRUARY 27.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
AN INITIAL OBSERVATION AT IGNITION AND A MID BURN OBSERVATION ARE REQUIRED.
PLEASE RELAY THEM TO THE NATIONAL WEATHER SERVICE FOR EACH PRESCRIBED BURN.
..VERY WINDY WITH LOW RH ON FRIDAY
DISCUSSION
MOSTLY SUNNY AND MILD TODAY, WITH HIGHS IN THE MID-50S. WINDS WILL BECOME
BREEZY OUT OF THE NORTHWEST, SUSTAINED 10 TO 18 MPH WITH A FEW WINDS GUSTS
AROUND 25 MPH. SIMILAR VALUES OF RH TO YESTERDAY, WITH MINRH VALUES BOTTOMING
OUT NEAR 40 PERCENT BY MID-AFTERNOON. IT WILL REMAIN A BIT BREEZY OVERNIGHT
WITH MODERATE TO GOOD RH RECOVERY. IT WILL BECOME VERY WINDY ON FRIDAY,
WITH PEAK SUSTAINED NORTHWEST WINDS OF 20-30 MPH WITH WINDS GUSTS TO 45 MPH.
RH VALUES WILL BE ABOUT 10% LOWER THAN TODAY, APPROACHING CRITICAL VALUES.
TEMPERATURES WILL REMAIN MILD WITH HIGHS AROUND 60F.
HAVE A SAFE BURN!
REST OF TODAY
SKY/WEATHER.........SUNNY (0-5 PERCENT).
MAX TEMPERATURE.....AROUND 55.
MIN HUMIDITY........40 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 10 TO 16 MPH WITH GUSTS TO 25 MPH.
MIXING HEIGHT.......4400 FT AGL.
TRANSPORT WINDS.....NORTHWEST 20 TO 26 MPH.
SMOKE DISPERSAL.....GOOD (37000 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (100800 KNOT-FT) IN THE
AFTERNOON.
GFDI................8.
TIME (CST) 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........3 3 2 1 1 3
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............48 50 53 55 55 54
RH..............51 48 46 44 42 43
20 FT WIND DIR..NW NW NW NW NW W
20 FT WIND SPD..15 15 15 16 14 10
20 FT WIND GUST.25 25 23 23 18 14
MIX HGT (KFT)...2.9 3.7 4.1 4.4 4.4 2.2
TRANSP WIND DIR.NW NW NW NW NW W
TRANSP WIND SPD.24 25 26 26 25 20
GFDI............10 11 12 11 6 4
VRATE KT-FT/1K..62 81 94 101 97 37
VENTRATE CAT....GD GD GD VGD GD PR
SDSPL KT-FT/100062 81 94 101 97 37
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT).
MIN TEMPERATURE.....AROUND 37.
MAX HUMIDITY........73 PERCENT.
WIND (20 FT)........WEST WINDS 6 TO 10 MPH SHIFTING TO THE SOUTHWEST
6 TO 15 MPH IN THE LATE EVENING AND OVERNIGHT.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....WEST 10 TO 13 MPH SHIFTING TO THE SOUTHWEST 14
TO 22 MPH LATE IN THE EVENING.
SMOKE DISPERSAL.....FAIR (14000 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (3800 KNOT-FT) LATE IN THE
NIGHT.
GFDI................4.
TIME (CST) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY (%).........3 4 6 12 25 35
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
TEMP............52 45 41 39 40 40
RH..............48 63 70 71 70 67
20 FT WIND......W 7 SW 6 SW 7 SW 10 SW 13 SW 15
20 FT WIND GUST.8 14 21
MIX HGT (FT)....600 500 400 500 600 700
TRANSPORT WIND..W 12 W 10 SW 13 SW 17 SW 20 SW 21
GFDI............3 1 1 2 3 5
VRATE KT-FT/1K..6 4 5 8 10 13
VENTRATE CAT....POOR POOR POOR POOR POOR POOR
SDSPL KT-FT/10006 4 5 8 10 13
FRIDAY
SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT).
MAX TEMPERATURE.....AROUND 59.
MIN HUMIDITY........30 PERCENT.
WIND (20 FT)........BREEZY. WEST WINDS 16 TO 22 MPH WITH GUSTS TO
AROUND 33 MPH SHIFTING TO THE NORTHWEST 23 TO
28 MPH WITH GUSTS TO AROUND 45 MPH LATE IN THE
MORNING.
MIXING HEIGHT.......6200 FT AGL.
TRANSPORT WINDS.....WEST 21 TO 26 MPH INCREASING TO NORTHWEST 31 TO
40 MPH IN THE LATE MORNING AND EARLY AFTERNOON,
THEN INCREASING TO 38 TO 43 MPH LATE IN THE
AFTERNOON DECREASING TO AROUND 33 MPH LATE IN
THE AFTERNOON.
SMOKE DISPERSAL.....FAIR (15000 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (131800
KNOT-FT) IN THE AFTERNOON.
GFDI................11 INCREASING TO 24 LATE IN THE MORNING, THEN
INCREASING TO 39 EARLY IN THE AFTERNOON
INCREASING TO 49 EARLY IN THE AFTERNOON
DECREASING TO 34.
TIME (CST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........30 30 36 32 50 53 40 21 16 14 23 38
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............42 43 45 49 52 54 57 57 58 58 56 53
RH..............58 58 56 50 45 42 40 38 36 34 37 40
20 FT WIND DIR..W W W W W NW NW NW NW NW NW NW
20 FT WIND SPD..16 17 18 20 22 23 25 26 28 28 26 24
20 FT WIND GUST.24 25 25 30 33 37 41 43 44 45 40 38
MIX HGT (KFT)...0.8 0.8 0.9 1.5 2.5 3.2 4.3 4.9 5.6 6.2 5.2 4.1
TRANSP WIND DIR.W W W NW NW NW NW NW NW NW NW NW
TRANSP WIND SPD.22 22 21 26 31 35 36 40 43 41 38 33
GFDI............8 9 10 14 21 26 37 41 47 51 38 29
VRATE KT-FT/1K..16 15 16 35 69 97 132 173 205 225 173 122
VENTRATE CAT....PR PR PR PR GD GD VGD EXL EXL EXL EXL VGD
SDSPL KT-FT/100016 15 16 35 69 97 132 173 205 225 173 122
FORECASTER...FOWLE
REQUESTED BY...LAEL NEAL
TYPE OF REQUEST...PRESCRIBED
.TAG 2504175.0/DMX
.DELDT 02/27/25
.FORMATTERVERSION 2.0.0
.EMAIL LAEL.NEAL@POLKCOUNTYIOWA.GOV
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