038  
FNUS74 KMOB 201333  
FWSMOB  
 
SPOT FORECAST FOR CHICK CPT 372...U.S. FOREST SERVICE  
NATIONAL WEATHER SERVICE MOBILE AL  
833 AM CDT FRI APR 20 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 CDT ON APRIL 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
LIGHT NORTHEAST FLOW AND CLEAR SKIES EXPECTED TODAY,  
WITH MAX GUSTS DURING THE AFTERNOON HOURS AROUND 15 MPH. MINIMUM RH  
VALUES REMAIN ABOVE CRITICAL THRESHOLDS, AROUND 37 TO 40 PERCENT.  
 
FOG POTENTIAL AND OTHER REMARKS...FOG NOT EXPECTED.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (0-10 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 70.  
MIN HUMIDITY........39 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS 6 TO 7 MPH.  
MIXING HEIGHT.......2200-4100 FT AGL INCREASING TO 4300-4700 FT AGL  
EARLY IN THE AFTERNOON.  
MIXING HEIGHT (M)...671-1250 METERS AGL INCREASING TO 1311-1433  
METERS AGL EARLY IN THE AFTERNOON.  
TRANSPORT WINDS.....EAST AROUND 10 MPH.  
TRANSPORT WINDS M/S.EAST AROUND 4 METERS/SECOND.  
DISPERSION INDEX....33 INCREASING TO 58.  
LVORI...............2.  
STABILITY CLASS.....2.  
 
TIME (CDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........4 4 3 3 2 3 5 6 6  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1  
TEMP............51 56 59 62 64 66 68 70 70  
RH..............59 51 49 46 45 43 40 39 39  
20 FT WIND DIR..NE NE NE NE NE NE NE NE NE  
20 FT WIND SPD..6 6 6 6 6 6 6 6 6  
20 FT WIND GUST.10 10 8 8 7 8 10 10 8  
MIX HGT (KFT)...2.2 2.7 3.2 3.6 4.1 4.3 4.5 4.7 4.7  
MIX HGT (KM)....0.7 0.8 1.0 1.1 1.2 1.3 1.4 1.4 1.4  
TRANSP WIND DIR.NE NE NE NE E E E E E  
TRANSP WIND SPD.10 10 10 10 10 10 10 10 10  
TRANS WIND DIR..NE NE NE NE E E E E E  
TRANS SPD (M/S).4 4 4 4 4 4 4 4 4  
DISPERSION IDX..28 33 37 44 49 52 53 56 59  
LVORI...........2 1 1 1 1 1 1 1 1  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
LAL.................NO TSTMS.  
MIN TEMPERATURE.....AROUND 50.  
MAX HUMIDITY........89 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS AROUND 5 MPH EARLY IN THE  
EVENING BECOMING LIGHT.  
MIXING HEIGHT.......2900-4700 FT AGL DECREASING TO 400-600 FT AGL  
EARLY IN THE EVENING.  
MIXING HEIGHT (M)...884-1433 METERS AGL DECREASING TO 122-183  
METERS AGL EARLY IN THE EVENING.  
TRANSPORT WINDS.....EAST 7 TO 10 MPH.  
TRANSPORT WINDS M/S.EAST 3 TO 4 METERS/SECOND.  
DISPERSION INDEX....57 DECREASING TO 4.  
LVORI...............4.  
STABILITY CLASS.....4.  
 
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........8 9 9 9 9 9 9 9 10 13 14 15  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............69 67 63 60 56 54 53 53 52 51 51 50  
RH..............42 47 54 60 69 74 77 77 80 83 83 89  
20 FT WIND DIR..NE NE NE NE NE NE E E E E E E  
20 FT WIND SPD..5 4 3 3 3 3 4 4 4 4 3 4  
20 FT WIND GUST.6 6 5 4 4 5 5 6 5 5 5 5  
MIX HGT (KFT)...4.7 2.9 0.6 0.6 0.6 0.6 0.6 0.5 0.5 0.5 0.4 0.5  
MIX HGT (KM)....1.4 0.9 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.1 0.2  
TRANSP WIND DIR.E E E E E E E E E E E E  
TRANSP WIND SPD.10 9 8 8 7 7 7 7 7 7 7 7  
TRANS WIND DIR..E E E E E E E E E E E E  
TRANS SPD (M/S).4 4 4 4 3 3 3 3 3 3 3 3  
DISPERSION IDX..57 4 4 3 3 3 3 3 3 3 3 3  
LVORI...........1 2 2 3 3 3 4 5 5 6 6 6  
   
SATURDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (40-50 PERCENT) THEN BECOMING  
MOSTLY CLOUDY (70-80 PERCENT).  
CHANCE OF PCPN......10 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 76.  
MIN HUMIDITY........50 PERCENT.  
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHEAST 5 TO 7 MPH.  
MIXING HEIGHT.......500-2400 FT AGL INCREASING TO 3300-5200 FT AGL  
IN THE LATE MORNING AND AFTERNOON.  
MIXING HEIGHT (M)...152-732 METERS AGL INCREASING TO 1006-1585  
METERS AGL IN THE LATE MORNING AND AFTERNOON.  
TRANSPORT WINDS.....SOUTHEAST 8 TO 16 MPH INCREASING TO 12 TO 18  
MPH IN THE LATE MORNING AND AFTERNOON.  
TRANSPORT WINDS M/S.SOUTHEAST 4 TO 7 METERS/SECOND INCREASING TO 5  
TO 8 METERS/SECOND IN THE LATE MORNING AND  
AFTERNOON.  
DISPERSION INDEX....6 INCREASING TO 21 EARLY IN THE MORNING, THEN  
INCREASING TO 46 LATE IN THE MORNING INCREASING  
TO 72 LATE IN THE MORNING DECREASING TO 62  
DECREASING TO 42 IN THE AFTERNOON.  
LVORI...............4.  
STABILITY CLASS.....2.  
 
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........17 18 23 34 39 45 56 61 64 69 72 76  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).0 10 10 10 10 10 10 10 10 10 10 10  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............51 53 57 61 65 70 72 74 75 76 76 75  
RH..............86 80 75 70 63 55 53 51 50 50 50 54  
20 FT WIND DIR..E E E E E SE SE SE SE SE SE SE  
20 FT WIND SPD..4 5 6 6 6 6 6 6 6 6 6 6  
20 FT WIND GUST.6 6 7 8 10 10 10 10 10 10 10 8  
MIX HGT (KFT)...0.5 0.6 1.5 2.4 3.3 3.8 4.4 4.9 5.0 5.1 5.2 5.2  
MIX HGT (KM)....0.2 0.2 0.5 0.7 1.0 1.2 1.3 1.5 1.5 1.6 1.6 1.6  
TRANSP WIND DIR.E E E SE SE SE SE SE SE SE SE SE  
TRANSP WIND SPD.8 9 13 16 18 18 16 15 14 14 14 12  
TRANS WIND DIR..E E E SE SE SE SE SE SE SE SE SE  
TRANS SPD (M/S).4 4 6 7 8 8 7 7 6 6 6 5  
DISPERSION IDX..3 8 21 46 69 74 62 45 44 44 43 39  
LVORI...........6 4 3 2 1 1 1 1 1 1 1 1  
 

 
FORECASTER...49  
REQUESTED BY...RODNEY LANDRUM  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1807177.0/MOB  
.DELDT 04/20/18  
.EMAIL RJLANDRUM@FS.FED.US  
 
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