FNUS74 KMOB 171222
FWSMOB

SPOT FORECAST FOR NLO 4A...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE MOBILE AL
622 AM CST TUE FEB 17 2009

FORECAST IS BASED ON IGNITION TIME OF 1200 CST ON FEBRUARY 17.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...INCREASED CLOUDS AND HIGHER HUMIDITIES CAN BE EXPECTED
TODAY AND WEDNESDAY IN RESPONSE TO A DEVELOPING COLD FRONT APPROACHING
FROM THE WEST. FOR TONIGHT AND ESPECIALLY ON WEDNESDAY SHOWERS AND
THUNDERSTORMS WILL BECOME BETTER DEVELOPED IN ADVANCE OF THE COLD FRONT
WITH A FEW STORMS POSSIBLY BECOMING STRONG TO SEVERE BY WEDNESDAY AFTERNOON
AND EARLY WEDNESDAY EVENING. A STRONG SOUTHERLY FLOW AHEAD OF THE FRONT
WILL ALSO RESULT IN HIGHER THAN NORMAL DISPERSION INDICES THROUGH WEDNESDAY
EVENING...CONTINUING IN THE WAKE OF THE FRONT ON THURSDAY AS A MODERATE
TO STRONG NORTHERLY FLOW DEVELOPS. AFTERNOON RELATIVE HUMIDITIES WILL HAVE
TO BE CLOSELY MONITORED IN THE WAKE OF THE FRONT THURSDAY THROUGH SATURDAY.

.TODAY...

TIME (CST)      NOON   2 PM   4 PM
SKY (%).........53     53     53
WEATHER COV.....
WEATHER TYPE....NONE   NONE   NONE
TEMP............57     58     57
RH..............52     55     62
20 FT WIND DIR..E      SE     SE
20 FT WIND SPD..11     12     12
MIX HGT (FT)....2500   2000   1200
MIX HGT (M).....760    610    370
TRANSP WIND DIR.E      SE     SE
TRANSP WIND SPD.18     18     20
TRANS SPD (M/S).8      8      9
DISPERSION......40     36     29
LVORI...........1      1      2

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). SLIGHT CHANCE OF
                    RAIN SHOWERS LATE.
MIN TEMPERATURE.....AROUND 56.
MAX HUMIDITY........88 PERCENT.
WIND (20 FT)........SOUTH WINDS 15 TO 17 MPH WITH GUSTS TO 25 MPH
                    TOWARD DAYBREAK.
MIXING HEIGHT.......600-700 FT AGL.
MIXING WINDS........SOUTH 21 TO 24 MPH.
DISPERSION INDEX....21.
LVORI...............3 INCREASING TO 4 IN THE LATE EVENING AND
                    OVERNIGHT.

.WEDNESDAY...

SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). CHANCE OF
                    THUNDERSTORMS AND SHOWERS.
MAX TEMPERATURE.....AROUND 70.
MIN HUMIDITY........84 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 17 TO 20 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS.
MIXING HEIGHT.......INCREASING TO 2200-2400 FT AGL BY AROUND MIDDAY.
MIXING WINDS........SOUTHWEST 25 TO 29 MPH.
DISPERSION INDEX....INCREASING TO 57 TO 61 BY AROUND MIDDAY.
LVORI...............4.

$$
FORECASTER...MOB FORECASTER
REQUESTED BY...MARK MENDONCA
TYPE OF REQUEST...PRESCRIBED
.TAG 20090217.NLO4A.03/MOB