FNUS74 KHUN 131213 FWSHUN SPOT FORECAST FOR TAPSVILLE...USFS NATIONAL WEATHER SERVICE HUNTSVILLE AL 713 AM CDT SUN MAR 13 2011 FORECAST IS BASED ON IGNITION TIME OF 0830 CDT ON MARCH 13. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... A FRONTAL BOUNDARY WILL STALL OUT NORTH OF THE ALABAMA-TENNESSEE BORDER TODAY...ALLOWING WEAK SOUTHERLY WINDS TO PULL MOISTURE BACK INTO THE REGION. MINIMUM RELATIVE HUMIDITY LEVELS WILL BE MUCH HIGHER THAN YESTERDAY...ONLY BOTTOMING OUT AROUND 50 PERCENT AT THE FORECAST POINT. CLOUD COVER WILL INCREASE THROUGHOUT THE DAY ACROSS NORTH ALABAMA AND SCATTERED SHOWERS WILL DEVELOP NEAR THE FRONT. SOME OF THESE MAY PUSH SOUTH TOWARD THE FORECAST SITE BUT THIS WOULD LIKELY NOT BE UNTIL LATE THIS AFTERNOON AT THE EARLIEST. MIXING HEIGHTS WILL RISE THROUGH THE AFTERNOON BUT DISPERSION RATES WILL NOT INCREASE MUCH DUE TO WEAK TRANSPORT WINDS. THE POTENTIAL FOR RAIN WILL INCREASE LATER TOMORROW AS A LOW PRESSURE CENTER SWINGS ACROSS THE SOUTHEAST. ASSOCIATED INCREASES TRANSPORT WINDS AS THE LOW APPROACHES WILL ALSO IMPROVE DISPERSION RATES. .TODAY... SKY/WEATHER.........PARTLY SUNNY (45-55 PERCENT). SLIGHT CHANCE OF RAIN SHOWERS IN THE AFTERNOON. MAX TEMPERATURE.....68 TO 70. MIN HUMIDITY........50 PERCENT. WIND (20 FT)........LIGHT WINDS BECOMING SOUTHWEST AROUND 5 MPH LATE IN THE MORNING...THEN BECOMING LIGHT IN THE AFTERNOON. CWR.................10 PERCENT INCREASING TO 20 PERCENT IN THE AFTERNOON. MIXING HEIGHT.......300-2100 FT AGL INCREASING TO 5300-6100 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHWEST 7 TO 15 MPH. TIME (CDT) 8 AM 10 AM NOON 2 PM 4 PM SKY (%).........MCLDY MCLDY MCLDY MCLDY MCLDY WEATHER COV..... S CHC S CHC WEATHER TYPE....NONE NONE NONE RNSHWR RNSHWR TEMP............49 56 63 67 69 RH..............90 74 61 53 50 20 FT WIND......SW 3 SW 5 SW 3 SW 3 SW 3 MIX HGT (FT)....700 2100 2100 5300 6100 TRANSPORT WIND..SW 7 W 15 W 15 W 7 SW 7 DISPERSION IDX..7 29 29 22 23 CHC OF PCPN (%).10 10 10 20 20 .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). SLIGHT CHANCE OF RAIN SHOWERS. MIN TEMPERATURE.....52 TO 54. MAX HUMIDITY........89 PERCENT. WIND (20 FT)........LIGHT WINDS. CWR.................20 PERCENT. MIXING HEIGHT.......6100 FT AGL DECREASING TO 400-1500 FT AGL. TRANSPORT WINDS.....SOUTH 3 TO 10 MPH. TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%).........MCLDY MCLDY MCLDY MCLDY MCLDY MCLDY WEATHER COV.....S CHC S CHC S CHC S CHC S CHC S CHC WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR TEMP............67 63 60 58 56 55 RH..............53 63 74 81 84 83 20 FT WIND......SE 2 E 1 E 1 SE 2 S 3 S 3 MIX HGT (FT)....6100 1500 500 500 400 600 TRANSPORT WIND..SW 7 S 3 SE 5 SE 5 S 6 S 10 DISPERSION IDX..31 2 2 2 4 7 CHC OF PCPN (%).20 20 20 20 20 20 .MONDAY... SKY/WEATHER.........CLOUDY (85-95 PERCENT). CHANCE OF RAIN SHOWERS. MAX TEMPERATURE.....66 TO 68. MIN HUMIDITY........56 PERCENT. WIND (20 FT)........LIGHT WINDS BECOMING SOUTH 5 TO 10 MPH IN THE LATE MORNING AND AFTERNOON. CWR.................30 PERCENT. MIXING HEIGHT.......600-1900 FT AGL INCREASING TO 4700-4900 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHWEST 10 TO 16 MPH SHIFTING TO THE SOUTH 20 TO 21 MPH 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.....S CHC CHANCE CHANCE CHANCE CHANCE CHANCE WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR TEMP............54 54 59 63 65 66 RH..............87 87 77 66 59 56 20 FT WIND......S 3 S 3 S 7 S 9 S 10 S 10 MIX HGT (FT)....600 800 1900 1900 4700 4900 TRANSPORT WIND..S 10 S 13 SW 16 SW 16 SW 20 S 21 DISPERSION IDX..2 14 30 30 58 63 CHC OF PCPN (%).20 30 30 30 30 30 $$ FORECASTER...CROWE REQUESTED BY...CLARK TYPE OF REQUEST...PRESCRIBED .TAG 20110313.TAPSV.01/HUN