FNUS74 KMOB 131237 FWSMOB SPOT FORECAST FOR DESOTO 1356...U.S. FOREST SERVICE NATIONAL WEATHER SERVICE MOBILE AL 737 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 65. MIN HUMIDITY........25 PERCENT. WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST 10 TO 13 MPH IN THE LATE MORNING AND AFTERNOON. MIXING HEIGHT.......200-300 FT AGL INCREASING TO 5100-5300 FT AGL. MIXING WINDS........NORTH 5 TO 6 MPH INCREASING TO 20 TO 21 MPH IN THE LATE MORNING AND AFTERNOON. DISPERSION INDEX....4 INCREASING TO 63 LATE IN THE MORNING...THEN INCREASING TO 87 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..............53 60 63 64 RH................48 31 25 26 20 FT WIND DIR....N N N NW 20 FT WIND SPD....9 9 10 12 20 FT WIND GUST...16 16 17 21 MIX HGT (FT)......2700 2700 5100 5300 MIX HGT (M).......820 820 1550 1620 TRANSP WIND DIR...N N N N TRANSP WIND SPD...21 21 21 20 TRANS SPD (M/S)...9 9 9 9 DISPERSION........63 63 87 61 LVORI.............1 1 1 1 CWR...............0 0 0 0 .TONIGHT... SKY/WEATHER.........CLEAR (0-5 PERCENT). MIN TEMPERATURE.....AROUND 35. MAX HUMIDITY........73 PERCENT. WIND (20 FT)........NORTH WINDS 12 TO 13 MPH BECOMING LIGHT. MIXING HEIGHT.......5300 FT AGL DECREASING TO 2300 FT AGL EARLY IN THE EVENING...THEN INCREASING TO 3200 FT AGL LATE IN THE EVENING DECREASING TO 1300-1500 FT AGL AFTER MIDNIGHT. MIXING WINDS........NORTH AROUND 20 MPH DECREASING TO AROUND 15 MPH EARLY IN THE EVENING...THEN INCREASING TO AROUND 20 MPH LATE IN THE EVENING DECREASING TO AROUND 14 MPH AFTER MIDNIGHT. DISPERSION INDEX....61 DECREASING TO 8. LVORI...............1 INCREASING TO 3. TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%)...........0 4 4 4 4 4 WEATHER COV....... WEATHER TYPE......NONE NONE NONE NONE NONE NONE TEMP..............60 53 46 42 39 37 RH................30 40 55 63 68 70 20 FT WIND DIR....NW N NW NW N N 20 FT WIND SPD....12 10 4 4 3 3 20 FT WIND GUST...21 MIX HGT (FT)......5300 2300 3200 3200 1300 1500 MIX HGT (M).......1620 700 980 980 400 460 TRANSP WIND DIR...N N N N N N TRANSP WIND SPD...20 15 20 20 14 14 TRANS SPD (M/S)...9 7 9 9 6 6 DISPERSION........61 20 9 9 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 63. 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.......1500 FT AGL DECREASING TO 700 FT AGL EARLY IN THE MORNING...THEN INCREASING TO 3100 FT AGL LATE IN THE MORNING INCREASING TO 4000 FT AGL EARLY IN THE AFTERNOON INCREASING TO 4500 FT AGL. MIXING WINDS........NORTH AROUND 14 MPH BECOMING NORTHEAST EARLY IN THE MORNING...THEN INCREASING TO AROUND 15 MPH LATE IN THE MORNING BECOMING NORTH AROUND 5 MPH EARLY IN THE AFTERNOON SHIFTING TO THE NORTHWEST AROUND 7 MPH. DISPERSION INDEX....8 INCREASING TO 57 LATE IN THE MORNING...THEN DECREASING TO 22 EARLY IN THE AFTERNOON INCREASING TO 37 LATE 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 (%)...........4 8 8 8 8 8 WEATHER COV....... WEATHER TYPE......NONE NONE NONE NONE NONE NONE TEMP..............35 38 48 57 61 62 RH................73 63 42 30 26 27 20 FT WIND DIR....N NE NE NE NE W 20 FT WIND SPD....3 3 5 5 3 3 20 FT WIND GUST... MIX HGT (FT)......1500 700 3100 3100 4000 4500 MIX HGT (M).......460 210 940 940 1220 1370 TRANSP WIND DIR...N NE NE NE N NW TRANSP WIND SPD...14 9 15 15 5 7 TRANS SPD (M/S)...6 4 7 7 2 3 DISPERSION........6 10 57 57 22 37 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.02/MOB