FNUS74 KJAN 201301 FWSJAN SPOT FORECAST FOR COMPARTMENT 73...U.S. FOREST SERVICE NATIONAL WEATHER SERVICE JACKSON MS 801 AM CDT THU OCT 20 2011 FORECAST IS BASED ON IGNITION TIME OF 0930 CDT ON OCTOBER 20. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...MAIN FIRE WEATHER IMPACT WILL BE THE WINDS THROUGH THE DAY. INITIALLY THIS MORNING...WINDS WILL BE LIGHT AS HIGH PRESSURE WILL NOT ALLOW FOR BEST VENTING/TRANSPORT. BY 10 TO 11AM...WINDS WILL PICK UP TO 8 TO 10 MPH FROM THE WNW ALLOWING FOR BETTER VENTING. TRANSPORT WINDS OF 20 TO 25 MPH ABOVE THE SURFACE WILL HELP DISPERSION AS SOON AS SOME SURFACE WIND MIXING OCCURS. SKIES WILL REMAIN CLEAR THROUGHOUT THE DAY AS TEMPERATURES RISE INTO THE 50S TO LOW 60S THIS AFTERNOON. MINIMUM RELATIVE HUMIDITY VALUES WILL DROP DOWN INTO THE MID 30 PERCENTILES BY 2-4 PM THIS AFTERNOON. MIXING HEIGHTS WILL INCREASE TO NEAR 4 TO 5 KFT THIS AFTERNOON BEFORE INVERSION SETS UP GOING INTO THE EVENING HOURS THAT WILL EFFECTIVELY REDUCE SMOKE DISPERSION. TEMPERATURES TONIGHT WILL FALL TO NEAR OR JUST ABOVE FREEZING WITH FROST LIKELY IN EXPOSED OPEN AREAS WITH WINDS GOING TO NEAR CALM. WINDS WILL AGAIN PICK BACK UP ON FRIDAY BY 9 TO 10AM FROM THE NW AS HIGH PRESSURE SETTLES OVER THE REGION. DISPERSION OF SMOKE WILL NOT BE IDEAL THROUGH THE EARLY MORNING HOURS UNTIL SURFACE WINDS ARE ABLE TO MIX IN WITH DEEPER TRANSPORT WINDS ONCE THE MORNING INVERSION BREAKS AFTER SOME HEATING. /ALLEN/ .TODAY... TIME (CDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM SKY (%).........CLR CLR CLR CLR CLR CLR CLR CLR CLR WEATHER COV..... WEATHER TYPE.... TEMP............50 55 58 60 61 61 61 61 58 RH..............68 55 48 44 41 39 37 42 50 20 FT WIND DIR..W W W W W W W W W 20 FT WIND SPD..8 9 9 9 9 9 9 8 6 20 FT WIND GUST.10 12 12 12 12 12 12 10 8 MIX HGT (KFT)...3.5 4.0 4.3 4.4 4.5 4.5 4.5 4.4 2.7 MIX HGT (KM)....1.1 1.2 1.3 1.3 1.4 1.4 1.4 1.3 0.8 TRANSP WIND DIR.NW NW NW NW NW W W W W TRANSP WIND SPD.23 24 24 24 23 22 21 20 18 TRANS SPD (M/S).10 11 11 11 10 10 9 9 8 .TONIGHT... TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM SKY (%).........CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR WEATHER COV..... PTY WEATHER TYPE.... FST TEMP............54 49 47 45 44 42 41 39 38 37 37 35 RH..............50 58 64 68 71 74 77 79 80 82 83 87 20 FT WIND DIR..W W W W W W W W W NW NW NW 20 FT WIND SPD..5 3 2 2 2 2 2 2 1 1 0 0 20 FT WIND GUST.7 MIX HGT (KFT)...1.3 0.3 0.1 0.1 0.3 0.3 0.2 0.2 0.2 0.2 0.2 0.2 MIX HGT (KM)....0.4 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 TRANSP WIND DIR.W W W W W W W W W W W W TRANSP WIND SPD.17 16 13 8 5 3 3 5 5 5 5 3 TRANS SPD (M/S).8 7 6 4 2 1 1 2 2 2 2 1 .FRIDAY... TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM SKY (%).........CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR WEATHER COV.....PTY PTY WEATHER TYPE....FST FST $$ FORECASTER...ALLEN REQUESTED BY...TYLER VAN ORMER TYPE OF REQUEST...PRESCRIBED .TAG 20111020.COMPA.01/JAN