FNUS74 KSJT 122138 FWSSJT SPOT FORECAST FOR HARRIS FAMILY TRUST PRESCRIBED BURN...USDA-NRCS NATIONAL WEATHER SERVICE SAN ANGELO 438 PM CDT MON MAR 12 2012 FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON MARCH 13. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... LIGHT TO MODERATE 6 TO 12 MPH SOUTHERLY TO SOUTH...SOUTHWEST WINDS WILL PREVAIL TUESDAY MORNING...INCREASING TO 16 TO 23 MPH BY LATE MORNING AND INTO AFTERNOON HOURS TUESDAY. RELATIVE HUMIDITIES WILL BE HIGH DURING MORNING HOURS...MOSTLY ABOVE 60 PERCENT THEN DECREASE SLIGHTLY IN AFTERNOON HOURS INTO THE 40 PERCENT TO 50 PERCENT RANGE. THE MOST SIGNIFICANT TRENDS THROUGH THE PERIOD ARE IN MIXING HEIGHT...THEY WILL BE LOW DURING LATE NIGHT AND MORNING HOURS...MOSTLY LESS THAN 1700 FT...BUT WILL INCREASE TO ABOVE 7000 FT BY AFTERNOON. EARLY MORNING MIXING HEIGHTS ARE UNFAVORABLE FOR SMOKE DISPERSION DOWN WIND...AFTERNOON MIXING HEIGHTS ARE FAVORABLE FOR SMOKE DISPERSION DOWN WIND. LITTLE CHANGE IS EXPECTED FOR WEDNESDAY. WINDS WILL REMAIN SOUTHERLY TO SOUTHWESTERLY AND RELATIVE HUMIDITIES WILL BE AT OR ABOVE 60 PERCENT REACHING TO NEAR 90% PERCENT NEAR DAWN. MORNING TO AFTERNOON MIXING HEIGHT CHANGES WILL REMAIN THE BIGGEST CONCERN WITH SMOKE DISPERSION CONDITIONS... FAR GREATER DISPERSION IS EXPECTED DURING AFTERNOON HOURS THAN DURING LATE NIGHT AND EARLY MORNING HOURS. .TUESDAY... SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT). MAX TEMPERATURE.....AROUND 83. MIN HUMIDITY........40 PERCENT. WIND (20 FT)........SOUTH WINDS 6 TO 13 MPH. GUSTS UP TO 25 MPH LATE IN THE AFTERNOON. MIXING HEIGHT.......300-1700 FT AGL INCREASING TO 7800 FT AGL. TRANSPORT WINDS.....SOUTH 6 TO 14 MPH INCREASING TO 16 TO 23 MPH LATE IN THE MORNING. TIME (CDT) 10 AM NOON 2 PM 4 PM SKY (%).........60 57 56 57 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TEMP............65 74 81 83 RH..............78 57 46 41 20 FT WIND......S 9 S 10 S 12 S 13 20 FT WIND GUST.10 15 25 .TUESDAY NIGHT... SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT) THEN BECOMING PARTLY CLOUDY (45-55 PERCENT) THEN BECOMING MOSTLY CLOUDY (65-75 PERCENT). MIN TEMPERATURE.....AROUND 60. MAX HUMIDITY........96 PERCENT. WIND (20 FT)........SOUTH WINDS 8 TO 13 MPH. MIXING HEIGHT.......4800-6300 FT AGL DECREASING TO 300-400 FT AGL. TRANSPORT WINDS.....SOUTH 18 TO 26 MPH DECREASING TO 15 TO 16 MPH EARLY IN THE MORNING. TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%).........58 46 54 62 74 80 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............83 75 70 67 65 64 RH..............43 54 66 75 84 84 20 FT WIND......S 13 S 12 S 10 S 9 S 8 S 8 20 FT WIND GUST.20 20 15 10 15 15 .WEDNESDAY... SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). MAX TEMPERATURE.....AROUND 76. MIN HUMIDITY........50 PERCENT. WIND (20 FT)........SOUTH WINDS 8 TO 12 MPH. MIXING HEIGHT.......300-1600 FT AGL INCREASING TO 4800-5600 FT AGL. TRANSPORT WINDS.....SOUTH 14 TO 22 MPH INCREASING TO AROUND 24 MPH LATE IN THE AFTERNOON. TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM SKY (%).........86 86 82 78 76 72 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............62 60 65 71 75 76 RH..............87 93 81 68 60 58 20 FT WIND......S 8 S 9 S 10 S 12 S 12 S 12 20 FT WIND GUST.15 15 15 20 20 20 $$ FORECASTER...NAGLE REQUESTED BY...JUSTIN ODOM TYPE OF REQUEST...PRESCRIBED .TAG 20120313.HARRI.01/SJT