260  
FNUS74 KMOB 251940  
FWSMOB  
 
SPOT FORECAST FOR DESOTO BLOCK 6351...U.S. FOREST SERVICE  
NATIONAL WEATHER SERVICE MOBILE AL  
240 PM CDT TUE APR 25 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 1500 CDT ON APRIL 25.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
SOUTHERLY WINDS CONTINUE THROUGH WEDNESDAY AS A COLD  
FRONT APPROACHES FROM THE WEST. SCATTERED TO NUMEROUS SHOWERS AND  
THUNDERSTORMS ARE EXPECTED LATE WEDNESDAY NIGHT INTO THURSDAY  
MORNING. AFTERNOON RELATIVE HUMIDITY LEVELS REMAIN ABOVE CRITICAL  
VALUES.  
 
FOG POTENTIAL AND OTHER REMARKS...PATCHY FOG DEVELOPMENT WITH  
VISIBILITIES DOWN TO AROUND 1 MILE IS POSSIBLE LATE EACH NIGHT  
THROUGH WEDNESDAY NIGHT.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (0-10 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 82.  
MIN HUMIDITY........43 PERCENT.  
WIND (20 FT)........SOUTH WINDS AROUND 8 MPH.  
MIXING HEIGHT.......4500 FT AGL.  
MIXING HEIGHT (M)...1372 METERS AGL.  
TRANSPORT WINDS.....SOUTH 9 TO 12 MPH.  
TRANSPORT WINDS M/S.SOUTH 4 TO 5 METERS/SECOND.  
DISPERSION INDEX....46.  
LVORI...............1.  
STABILITY CLASS.....3.  
 
TIME (CDT) 3 PM 5 PM  
SKY (%).........4 3  
WEATHER COV.....  
WEATHER TYPE....NONE NONE  
TSTM COV........  
CHC OF PCPN (%).0 0  
LAL.............1 1  
TEMP............79 79  
RH..............44 47  
20 FT WIND DIR..S S  
20 FT WIND SPD..8 8  
20 FT WIND GUST.10 10  
MIX HGT (FT)....4500 4500  
MIX HGT (M).....1370 1370  
TRANSP WIND DIR.S S  
TRANSP WIND SPD.9 12  
TRANS WIND DIR..S S  
TRANS SPD (M/S).4 5  
DISPERSION IDX..44 47  
LVORI...........1 1  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
LAL.................NO TSTMS.  
MIN TEMPERATURE.....AROUND 60.  
MAX HUMIDITY........100 PERCENT.  
WIND (20 FT)........SOUTH WINDS 5 TO 7 MPH UNTIL EARLY MORNING  
BECOMING LIGHT.  
MIXING HEIGHT.......4500 FT AGL DECREASING TO 500-2400 FT AGL.  
MIXING HEIGHT (M)...1372 METERS AGL DECREASING TO 152-732 METERS  
AGL.  
TRANSPORT WINDS.....SOUTH 6 TO 14 MPH.  
TRANSPORT WINDS M/S.SOUTH 3 TO 6 METERS/SECOND.  
DISPERSION INDEX....60 DECREASING TO 8.  
LVORI...............5.  
STABILITY CLASS.....4.  
 
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........2 22 5 7 9 18  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0  
LAL.............1 1 1 1 1 1  
TEMP............78 74 68 64 62 61  
RH..............51 57 73 84 90 97  
20 FT WIND DIR..S S S S S S  
20 FT WIND SPD..7 7 6 5 5 4  
20 FT WIND GUST.10 10 10 10 5  
MIX HGT (FT)....4500 1200 1200 900 700 500  
MIX HGT (M).....1370 370 370 270 210 150  
TRANSP WIND DIR.S S S S S S  
TRANSP WIND SPD.13 13 9 7 6 6  
TRANS WIND DIR..S S S S S S  
TRANS SPD (M/S).6 6 4 3 3 3  
DISPERSION IDX..60 10 7 7 6 7  
LVORI...........1 2 3 4 5 7  
   
WEDNESDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 81.  
MIN HUMIDITY........58 PERCENT.  
WIND (20 FT)........SOUTH WINDS 5 TO 13 MPH.  
MIXING HEIGHT.......700-2600 FT AGL INCREASING TO 2800-3200 FT AGL  
LATE IN THE MORNING.  
MIXING HEIGHT (M)...213-792 METERS AGL INCREASING TO 853-975 METERS  
AGL LATE IN THE MORNING.  
TRANSPORT WINDS.....SOUTH 7 TO 13 MPH INCREASING TO 17 TO 22 MPH IN  
THE LATE MORNING AND AFTERNOON.  
TRANSPORT WINDS M/S.SOUTH 3 TO 6 METERS/SECOND INCREASING TO 8 TO  
10 METERS/SECOND IN THE LATE MORNING AND  
AFTERNOON.  
DISPERSION INDEX....8 INCREASING TO 18 EARLY IN THE MORNING, THEN  
INCREASING TO 29 EARLY IN THE MORNING  
INCREASING TO 45 LATE IN THE MORNING INCREASING  
TO 62 DECREASING TO 56 IN THE AFTERNOON.  
LVORI...............5.  
STABILITY CLASS.....3.  
 
TIME (CDT) 6 AM 10 AM 2 PM  
SKY (%).........26 28 32  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE  
TSTM COV........  
CHC OF PCPN (%).0 0 0  
LAL.............1 1 1  
TEMP............60 73 80  
RH..............100 71 60  
20 FT WIND DIR..S S S  
20 FT WIND SPD..5 9 13  
20 FT WIND GUST. 15 20  
MIX HGT (FT)....700 2600 3200  
MIX HGT (M).....210 790 980  
TRANSP WIND DIR.S S S  
TRANSP WIND SPD.7 21 22  
TRANS WIND DIR..S S S  
TRANS SPD (M/S).3 9 10  
DISPERSION IDX..8 58 55  
LVORI...........8 1 1  
 

 
FORECASTER...32  
REQUESTED BY...BOBBY ISER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1707726.1/MOB  
.EMAIL MSMNF01DISPATCH@FS.FED.US  
 
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