FNUS74 KHUN 211156 FWSHUN SPOT FORECAST FOR KEY CAVE NORTH 0100 0200...USFWS NATIONAL WEATHER SERVICE HUNTSVILLE AL 656 AM CDT WED MAR 21 2012 FORECAST IS BASED ON IGNITION TIME OF 1030 CDT ON MARCH 21. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... ANOTHER VERY WARM AFTERNOON IS EXPECTED IN THE VICINITY OF THE PRESCRIBED BURN SITE IN NORTHWEST ALABAMA...WITH TEMPERATURES EXPECTED TO REACH THE 83-85 DEGREE RANGE BY MID-AFTERNOON. RELATIVE HUMIDITY VALUES WILL FALL INTO THE 35-40 PERCENT RANGE AS THIS OCCURS. STRONG SOUTH TO SOUTHEASTERLY FLOW AHEAD OF A LOW PRESSURE SYSTEM APPROACHING THE REGION FROM THE WEST WILL COMBINE WITH HIGH AFTERNOON MIXING HEIGHTS TO RESULT IN VERY GOOD SMOKE PLUME DISPERSION TO THE NORTH-NORTHWEST. ALTHOUGH CLOUD COVER WILL INCREASE AND A FEW SHOWERS WILL POSSIBLE THIS AFTERNOON AND INTO THE FIRST PORTION OF THE EVENING...THE THREAT FOR HEAVIER RAIN AND THUNDERSTORMS WILL COME AFTER SUNRISE ON THURSDAY MORNING. .TODAY... SKY/WEATHER.........PARTLY SUNNY (45-55 PERCENT). MAX TEMPERATURE.....AROUND 84. MIN HUMIDITY........36 PERCENT. WIND (20 FT)........LIGHT WINDS BECOMING SOUTHEAST 6 TO 15 MPH. MIXING HEIGHT.......300 FT AGL INCREASING TO 6300-8200 FT AGL. TRANSPORT WINDS.....SOUTHEAST 7 TO 9 MPH INCREASING TO SOUTH 29 TO 30 MPH IN THE LATE MORNING AND AFTERNOON. TIME (CDT) 10 AM NOON 2 PM 4 PM SKY (%).........MCLDY MCLDY MCLDY MCLDY WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TEMP............71 78 82 84 RH..............63 48 40 36 20 FT WIND......SE 14 SE 15 SE 14 SE 12 MIX HGT (FT)....6900 6900 8200 6300 TRANSPORT WIND..SE 29 SE 29 S 30 S 29 DISPERSION IDX..39 100 109 97 .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT). CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. MIN TEMPERATURE.....AROUND 61. MAX HUMIDITY........86 PERCENT. WIND (20 FT)........SOUTHEAST WINDS 5 TO 9 MPH. MIXING HEIGHT.......6300 FT AGL DECREASING TO 500-900 FT AGL. TRANSPORT WINDS.....SOUTHEAST 25 TO 29 MPH DECREASING TO 9 TO 17 MPH IN THE LATE EVENING AND OVERNIGHT. TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%).........MCLDY MCLDY MCLDY MCLDY MCLDY MCLDY WEATHER COV..... CHANCE CHANCE WEATHER TYPE....NONE NONE NONE NONE RNSHWR RNSHWR TEMP............82 76 71 68 65 63 RH..............40 50 59 64 71 81 20 FT WIND......SE 9 SE 6 SE 5 SE 5 SE 5 SE 5 MIX HGT (FT)....6300 3200 900 900 500 500 TRANSPORT WIND..S 29 SE 25 SE 17 SE 17 SE 13 SE 9 DISPERSION IDX..97 61 20 12 9 6 .THURSDAY... SKY/WEATHER.........PARTLY SUNNY (65-75 PERCENT) THEN BECOMING CLOUDY (85-95 PERCENT). CHANCE OF SHOWERS AND THUNDERSTORMS EARLY IN THE MORNING...THEN SHOWERS AND THUNDERSTORMS LIKELY. MAX TEMPERATURE.....AROUND 73. MIN HUMIDITY........58 PERCENT. WIND (20 FT)........SOUTH WINDS 5 TO 12 MPH. MIXING HEIGHT.......500-1300 FT AGL INCREASING TO 2600-3400 FT AGL IN THE LATE MORNING AND AFTERNOON. TRANSPORT WINDS.....SOUTHEAST 9 TO 14 MPH SHIFTING TO THE SOUTH AROUND 21 MPH LATE IN THE MORNING...THEN BECOMING WEST AROUND 7 MPH EARLY IN THE AFTERNOON SHIFTING TO THE NORTHWEST AROUND 13 MPH LATE IN THE AFTERNOON. TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM SKY (%).........MCLDY CLOUDY CLOUDY CLOUDY CLOUDY CLOUDY WEATHER COV.....CHANCE LIKELY LIKELY LIKELY LIKELY LIKELY WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR TEMP............62 63 67 70 72 73 RH..............84 84 76 68 62 58 20 FT WIND......SE 5 SE 8 SE 10 S 12 S 10 S 9 MIX HGT (FT)....500 1300 2600 2600 3400 2800 TRANSPORT WIND..SE 9 SE 14 S 21 S 21 W 7 NW 13 DISPERSION IDX..6 15 27 45 18 29 $$ FORECASTER...DIXON REQUESTED BY...JASON VEHRS TYPE OF REQUEST...PRESCRIBED .TAG 20120321.KEYCA.03/HUN