663  
FNUS74 KMOB 131932  
FWSMOB  
 
SPOT FORECAST FOR BURN BLOCK 7201...USDA FOREST SERVICE  
NATIONAL WEATHER SERVICE MOBILE AL  
232 PM CDT TUE APR 13 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 1500 CDT ON APRIL 13.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
SHOWERS AND THUNDERSTORMS WILL BEGIN TO MOVE INTO  
THE BURN AREA OVER THE NEXT COUPLE OF HOURS. RELATIVE HUMIDITY  
REMAINS ABOVE CRITICAL THRESHOLDS, WITH TRANSPORT WINDS  
MAINTAINING SOUTHERLY AT 15 TO 20MPH. DISPERSIONS REMAIN GENERALLY  
GOOD OVER THE BURN AREA. WEDNESDAY FEATURES SIMILAR CONDITIONS,  
ALTHOUGH DISPERSIONS WILL BE MARKEDLY LOWER WITH LOW END GENERALLY  
GOOD TO NEAR GENERALLY POOR CONDITIONS DURING THE AFTERNOON.  
 
FOG POTENTIAL AND OTHER REMARKS...FOG NOT EXPECTED.  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). CHANCE OF  
SHOWERS AND THUNDERSTORMS.  
CHANCE OF PCPN......30 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 82.  
MIN HUMIDITY........38 PERCENT.  
WIND (20 FT)........SOUTHEAST WINDS AROUND 6 MPH. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS.  
MIXING HEIGHT.......3500 FT AGL.  
MIXING HEIGHT (M)...975-1067 METERS AGL.  
TRANSPORT WINDS.....SOUTH 16 TO 17 MPH.  
TRANSPORT WINDS M/S.SOUTH 7 TO 8 METERS/SECOND.  
DISPERSION INDEX....53.  
LVORI...............1.  
STABILITY CLASS.....3.  
 
TIME (CDT) 3 PM 5 PM  
SKY (%).........81 87  
WEATHER COV.....CHANCE CHANCE  
WEATHER TYPE....RNSHWR RNSHWR  
TSTM COV........CHANCE CHANCE  
CHC OF PCPN (%).30 30  
LAL.............1 1  
TEMP............82 80  
RH..............41 44  
20 FT WIND DIR..S S  
20 FT WIND SPD..6 7  
20 FT WIND GUST.10 10  
MIX HGT (FT)....3500 3200  
MIX HGT (M).....1070 980  
TRANSP WIND DIR.S S  
TRANSP WIND SPD.16 17  
TRANS WIND DIR..S S  
TRANS SPD (M/S).7 8  
DISPERSION IDX..56 50  
LVORI...........1 1  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT) THEN BECOMING  
PARTLY CLOUDY (45-55 PERCENT) THEN BECOMING  
MOSTLY CLOUDY (55-65 PERCENT). CHANCE OF  
SHOWERS AND THUNDERSTORMS.  
CHANCE OF PCPN......30 PERCENT.  
LAL.................9-15 STRIKES.  
MIN TEMPERATURE.....AROUND 60.  
MAX HUMIDITY........100 PERCENT.  
WIND (20 FT)........SOUTHEAST WINDS 5 TO 7 MPH EARLY IN THE EVENING  
BECOMING LIGHT. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS.  
MIXING HEIGHT.......200 FT AGL.  
MIXING HEIGHT (M)...61-975 METERS AGL.  
TRANSPORT WINDS.....SOUTH AROUND 17 MPH BECOMING SOUTHEAST 5 TO 9  
MPH.  
TRANSPORT WINDS M/S.SOUTH AROUND 8 METERS/SECOND BECOMING SOUTHEAST  
2 TO 4 METERS/SECOND.  
DISPERSION INDEX....50 DECREASING TO 4.  
LVORI...............5.  
STABILITY CLASS.....4.  
 
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........88 87 83 59 50 55  
WEATHER COV.....CHANCE CHANCE CHANCE CHANCE CHANCE CHANCE  
WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR  
TSTM COV........CHANCE CHANCE CHANCE CHANCE CHANCE CHANCE  
CHC OF PCPN (%).30 30 30 30 30 30  
LAL.............3 3 3 3 3 3  
TEMP............76 69 65 64 61 60  
RH..............54 70 84 87 97 100  
20 FT WIND DIR..S SSE SE ESE ESE ESE  
20 FT WIND SPD..6 5 4 3 3 3  
20 FT WIND GUST.10 6 6 4 4 4  
MIX HGT (FT)....3200 400 400 300 300 200  
MIX HGT (M).....980 120 120 90 90 60  
TRANSP WIND DIR.S E E ESE SE SE  
TRANSP WIND SPD.17 6 6 8 9 7  
TRANS WIND DIR..S E E ESE SE SE  
TRANS SPD (M/S).8 3 3 4 4 3  
DISPERSION IDX..50 5 4 4 3 3  
LVORI...........1 4 5 6 8 9  
   
WEDNESDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). CHANCE OF  
SHOWERS AND THUNDERSTORMS EARLY IN THE MORNING,  
THEN SHOWERS AND THUNDERSTORMS.  
CHANCE OF PCPN......90 PERCENT.  
LAL.................9-15 STRIKES UNTIL 0700, THEN >25 STRIKES.  
MAX TEMPERATURE.....AROUND 74.  
MIN HUMIDITY........71 PERCENT.  
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH 5 TO 8 MPH IN THE  
LATE MORNING AND AFTERNOON. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS.  
MIXING HEIGHT.......1600 FT AGL.  
MIXING HEIGHT (M)...61-488 METERS AGL.  
TRANSPORT WINDS.....EAST 2 TO 7 MPH SHIFTING TO THE SOUTH 10 TO 15  
MPH IN THE AFTERNOON.  
TRANSPORT WINDS M/S.EAST 1 TO 3 METERS/SECOND SHIFTING TO THE SOUTH  
4 TO 7 METERS/SECOND IN THE AFTERNOON.  
DISPERSION INDEX....6 INCREASING TO 21 IN THE AFTERNOON.  
LVORI...............7.  
STABILITY CLASS.....2.  
 
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........67 78 80 89 93 93  
WEATHER COV.....CHANCE DEFNTE DEFNTE DEFNTE DEFNTE DEFNTE  
WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR  
TSTM COV........CHANCE DEFNTE DEFNTE DEFNTE DEFNTE DEFNTE  
CHC OF PCPN (%).30 80 80 80 90 90  
LAL.............3 5 5 5 5 5  
TEMP............60 63 71 73 74 73  
RH..............100 100 84 76 71 73  
20 FT WIND DIR..ESE SE S SW SSW SSE  
20 FT WIND SPD..3 4 6 7 7 6  
20 FT WIND GUST.4 6 7 10 10 10  
MIX HGT (FT)....200 400 800 1300 1400 900  
MIX HGT (M).....60 120 240 400 430 270  
TRANSP WIND DIR.S SSE E SE SSE S  
TRANSP WIND SPD.5 2 3 12 15 10  
TRANS WIND DIR..S SSE E SE SSE S  
TRANS SPD (M/S).2 1 1 5 7 4  
DISPERSION IDX..2 3 6 15 21 14  
LVORI...........10 9 4 3 3 4  
 

 
FORECASTER...25  
REQUESTED BY...CLIFF WILLIS  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2108129.3/MOB  
.DELDT 04/13/21  
.FORMATTERVERSION 1.0.26  
.EMAIL CLIFTON.WILLIS@USDA.GOV  
 
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