413
FNUS74 KBMX 130633
FWSBMX
SPOT FORECAST FOR TRAMMEL A RX...USFS
NATIONAL WEATHER SERVICE BIRMINGHAM AL
133 AM CDT WED MAY 13 2026
FORECAST IS BASED ON IGNITION TIME OF 0600 CDT ON MAY 13.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
RH VALUES DROP INTO THE 45-50 PERCENT RANGE THIS AFTERNOON AT THE
TRAMMEL A BURN SITE. 20FT WINDS WILL BE LIGHT AND VARIABLE IN THE
MORNING BECOMING NORTHWEST AROUND 5 MPH IN THE AFTERNOON.
TRANSPORT WINDS WILL SHIFT FROM EASTERLY TO NORTHWESTERLY THROUGH
THE DAY, WITH SPEEDS OF 8-10 MPH BY AFTERNOON. A DRY COLD FRONT
MOVES THROUGH THIS EVENING. 20FT WINDS WILL BECOME LIGHT TONIGHT,
WHILE TRANSPORT WINDS WILL BE NORTHERLY TO NORTHWESTERLY AROUND 8
TO 12 MPH. EXPECT LOWER RH VALUES BEHIND THE FRONT ON THURSDAY, IN
THE 30 TO 35 PERCENT RANGE. 20FT AND TRANSPORT WINDS WILL BE OUT
OF THE NORTH AT 6 MPH AND 15-17 MPH, RESPECTIVELY.
TODAY
SKY/WEATHER.........SUNNY (15-25 PERCENT).
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........44 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST AROUND 5 MPH
LATE IN THE AFTERNOON, THEN BECOMING LIGHT LATE
IN THE AFTERNOON.
MIXING HEIGHT.......5800 FT AGL.
TRANSPORT WINDS.....EAST 3 TO 6 MPH SHIFTING TO THE NORTHWEST 5 TO
12 MPH IN THE LATE MORNING AND AFTERNOON.
DISPERSION INDEX....3 INCREASING TO 74.
LVORI...............3.
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
SKY (%).........10 11 18 30 29 26
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0 0 0
TEMP............56 60 71 76 78 80
RH..............83 84 61 54 48 44
20 FT WIND......N 0 N 0 N 0 NW 2 NW 3 NW 5
20 FT WIND GUST.4 2 2 6 10 10
20 FT WIND DIR..000 000 000 320 320 310
MIX HGT (FT)....400 1000 2600 4500 5800 5600
TRANSPORT WIND..E 6 E 5 N 5 NW 8 NW 9 NW 10
DISPERSION IDX..3 2 2 46 66 72
LVORI...........5 5 2 2 1 1
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (0-10 PERCENT).
CWR.................0 PERCENT.
MIN TEMPERATURE.....AROUND 55.
MAX HUMIDITY........84 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....NORTH 8 TO 12 MPH.
DISPERSION INDEX....45 DECREASING TO 5.
LVORI...............3.
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY (%).........12 8 9 5 2 2
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0 0 0
TEMP............78 69 65 63 60 56
RH..............52 78 84 81 81 80
20 FT WIND......NW 2 W 1 W 1 NW 2 N 2 N 2
20 FT WIND GUST.7 6 7 10 10 10
20 FT WIND DIR..310 280 290 330 340 350
MIX HGT (FT)....3400 500 400 500 500 400
TRANSPORT WIND..NW 10 NW 8 NW 8 N 10 N 12 N 12
DISPERSION IDX..45 4 4 5 5 5
LVORI...........1 3 4 4 4 4
THURSDAY
SKY/WEATHER.........SUNNY (0-5 PERCENT).
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 75.
MIN HUMIDITY........34 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTH 5 TO 6 MPH IN THE
LATE MORNING AND AFTERNOON.
MIXING HEIGHT.......5900 FT AGL.
TRANSPORT WINDS.....NORTH 12 TO 18 MPH.
DISPERSION INDEX....7 INCREASING TO 76 LATE IN THE MORNING, THEN
INCREASING TO 106 EARLY IN THE AFTERNOON
DECREASING TO 88 LATE IN THE AFTERNOON
DECREASING TO 73.
LVORI...............3.
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
SKY (%).........2 1 0 0 0 0
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0 0 0
TEMP............55 58 66 71 73 75
RH..............80 72 50 41 37 34
20 FT WIND......N 2 N 3 N 5 N 6 N 6 N 6
20 FT WIND GUST.10 11 11 11 11 10
20 FT WIND DIR..350 010 000 350 340 340
MIX HGT (FT)....500 2000 3500 4400 5800 5100
TRANSPORT WIND..N 12 N 17 N 17 N 15 N 16 N 15
DISPERSION IDX..5 8 8 78 105 88
LVORI...........4 3 1 1 1 1
FORECASTER...JDAVIS
REQUESTED BY...MICHAEL LARSON
TYPE OF REQUEST...PRESCRIBED
.TAG 2613478.0/BMX
.DELDT 05/13/26
.FORMATTERVERSION 2.0.0
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