FNUS74 KMOB 131206 FWSMOB SPOT FORECAST FOR DESOTO 1354...U.S. FOREST SERVICE NATIONAL WEATHER SERVICE MOBILE AL 706 AM CDT WED MAR 13 2013 FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON MARCH 13. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...HIGH PRESSURE BUILDING FROM THE CENTRAL PLAINS TO THE LOWER MISSISSIPPI VALLEY WILL BRING A MUCH DRIER AIRMASS AND INCREASED NORTHWESTERLY WINDS TO THE REGION TODAY. CRITICALLY LOW RELATIVE HUMIDITY FOR AROUND 4 HOURS IS EXPECTED ACROSS SOUTHWEST AND SOUTH CENTRAL ALABAMA...WHILE CRITICALLY LOW RELATIVE HUMIDITY COMBINED WITH BREEZY NORTHWESTERLY WINDS AND ERC VALUES AROUND 30 IS EXPECTED ACROSS THE WESTERN FLORIDA PANHANDLE. THESE CONDITIONS WILL BRING CRITICAL FIRE WEATHER CONDITIONS TO THESE LOCATIONS THIS AFTERNOON. RELATIVE HUMIDITY MAY FALL TO JUST BELOW CRITICAL LEVELS OVER SOUTHEAST MISSISSIPPI THIS AFTERNOON...BUT 20 FOOT WIND SPEEDS MAY BE JUST SHY OF CRITICAL FIRE WEATHER CRITERIA THERE. DISPERSIONS ARE EXPECTED TO INCREASE ABOVE 75 ACROSS A GOOD PORTION OF THE REGION THIS AFTERNOON GIVEN INCREASED NORTHWEST FLOW THROUGH THE MIXED LAYER. A LONG DURATION OF CRITICALLY LOW RELATIVE HUMIDITY WILL BE POSSIBLE OVER PORTIONS OF SOUTH CENTRAL ALABAMA AGAIN THURSDAY AFTERNOON. FOG POTENTIAL AND OTHER REMARKS...FOG IS NOT EXPECTED. .TODAY... SKY/WEATHER.........SUNNY (0-5 PERCENT). MAX TEMPERATURE.....AROUND 64. MIN HUMIDITY........25 PERCENT. WIND (20 FT)........LIGHT WINDS BECOMING NORTH 10 TO 13 MPH IN THE LATE MORNING AND AFTERNOON. MIXING HEIGHT.......200-300 FT AGL INCREASING TO 5000-5200 FT AGL. MIXING WINDS........NORTHWEST AROUND 5 MPH INCREASING TO NORTH 20 TO 21 MPH IN THE LATE MORNING AND AFTERNOON. DISPERSION INDEX....4 INCREASING TO 62 LATE IN THE MORNING...THEN INCREASING TO 86 EARLY IN THE AFTERNOON DECREASING TO 61 LATE IN THE AFTERNOON. LVORI...............4 DECREASING TO 1. TIME (CDT) 10 AM NOON 2 PM 4 PM SKY (%)...........0 0 0 0 WEATHER COV....... WEATHER TYPE......NONE NONE NONE NONE TEMP..............52 59 63 64 RH................48 32 26 25 20 FT WIND DIR....N N N N 20 FT WIND SPD....9 9 10 12 20 FT WIND GUST...16 16 17 20 MIX HGT (FT)......2700 2700 5000 5200 MIX HGT (M).......820 820 1520 1580 TRANSP WIND DIR...N N N N TRANSP WIND SPD...21 21 21 20 TRANS SPD (M/S)...9 9 9 9 DISPERSION........62 62 86 61 LVORI.............1 1 1 1 CWR...............0 0 0 0 .TONIGHT... SKY/WEATHER.........CLEAR (0-5 PERCENT). MIN TEMPERATURE.....AROUND 35. MAX HUMIDITY........71 PERCENT. WIND (20 FT)........NORTH WINDS 12 TO 13 MPH BECOMING LIGHT. MIXING HEIGHT.......5200 FT AGL DECREASING TO 2300 FT AGL EARLY IN THE EVENING...THEN INCREASING TO 3300 FT AGL LATE IN THE EVENING DECREASING TO 1500-1600 FT AGL AFTER MIDNIGHT. MIXING WINDS........NORTH AROUND 20 MPH DECREASING TO 14 TO 18 MPH. DISPERSION INDEX....61 DECREASING TO 7. LVORI...............1 INCREASING TO 3. TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%)...........0 3 3 3 3 3 WEATHER COV....... WEATHER TYPE......NONE NONE NONE NONE NONE NONE TEMP..............60 54 47 42 39 38 RH................28 37 53 61 66 69 20 FT WIND DIR....N N NW NW N N 20 FT WIND SPD....12 10 4 4 3 2 20 FT WIND GUST...20 17 MIX HGT (FT)......5200 2300 3300 3300 1500 1600 MIX HGT (M).......1580 700 1010 1010 460 490 TRANSP WIND DIR...N N N N N N TRANSP WIND SPD...20 14 18 18 14 14 TRANS SPD (M/S)...9 6 8 8 6 6 DISPERSION........61 19 8 8 6 6 LVORI.............1 2 2 2 3 3 CWR...............0 0 0 0 0 0 .THURSDAY... SKY/WEATHER.........SUNNY (0-10 PERCENT). MAX TEMPERATURE.....AROUND 64. MIN HUMIDITY........26 PERCENT. WIND (20 FT)........LIGHT WINDS BECOMING NORTHEAST AROUND 5 MPH LATE IN THE MORNING...THEN BECOMING LIGHT IN THE AFTERNOON. MIXING HEIGHT.......1600 FT AGL DECREASING TO 700 FT AGL EARLY IN THE MORNING...THEN INCREASING TO 3000 FT AGL LATE IN THE MORNING INCREASING TO 4100 FT AGL EARLY IN THE AFTERNOON INCREASING TO 4600 FT AGL. MIXING WINDS........NORTH AROUND 14 MPH BECOMING NORTHEAST EARLY IN THE MORNING...THEN INCREASING TO AROUND 14 MPH LATE IN THE MORNING BECOMING NORTH AROUND 5 MPH EARLY IN THE AFTERNOON SHIFTING TO THE NORTHWEST AROUND 6 MPH. DISPERSION INDEX....8 INCREASING TO 51 LATE IN THE MORNING...THEN DECREASING TO 27 IN THE AFTERNOON. LVORI...............3 DECREASING TO 1 LATE IN THE MORNING...THEN INCREASING TO 2 EARLY IN THE AFTERNOON DECREASING TO 1 LATE IN THE AFTERNOON. TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM SKY (%)...........3 8 8 8 8 8 WEATHER COV....... WEATHER TYPE......NONE NONE NONE NONE NONE NONE TEMP..............35 38 48 56 61 63 RH................71 63 43 31 26 26 20 FT WIND DIR....N NE NE NE NE W 20 FT WIND SPD....2 3 4 4 3 3 20 FT WIND GUST... MIX HGT (FT)......1600 700 3000 3000 4100 4600 MIX HGT (M).......490 210 910 910 1250 1400 TRANSP WIND DIR...N NE NE NE N NW TRANSP WIND SPD...14 9 14 14 5 6 TRANS SPD (M/S)...6 4 6 6 2 3 DISPERSION........6 10 51 51 23 31 LVORI.............3 3 1 1 2 1 CWR...............0 0 0 0 0 0 $$ FORECASTER...32 REQUESTED BY...EDDIE BAGGETT TYPE OF REQUEST...PRESCRIBED .TAG 20130313.DESOT.01/MOB