578  
FNUS71 KAKQ 221408  
FWSAKQ  
 
SPOT FORECAST FOR BIG WOODS STATE FOREST...VIRGINIA DEPARTMENT OF FRESTRY  
NATIONAL WEATHER SERVICE WAKEFIELD VA  
1008 AM EDT THU APR 22 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 1600 EDT ON APRIL 22.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE AT 757-899-5734.  
   
DISCUSSION
 
 
HIGH PRESSURE OVER THE AREA FRIDAY MORNING WILL MOVE OFF THE  
COAST DURING THE AFTERNOON. LIGHT W/NW WINDS IN THE MORNING  
WILL BECOME SW 5-10 MPH WITH GUSTS OF 15-20 MPH DURING THE  
AFTERNOON. MIN RH VALUES FRIDAY WILL BE BETWEEN 25-30 PERCENT.  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
MAX TEMPERATURE.....AROUND 59.  
MIN HUMIDITY........23 PERCENT.  
WIND (20 FT)........WEST WINDS AROUND 13 MPH WITH GUSTS TO AROUND  
18 MPH.  
MIXING HEIGHT.......9000 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 26 MPH.  
SMOKE DISPERSAL.....EXCELLENT (199300 KNOT-FT).  
LVORI...............1.  
ADI.................98.  
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (EDT) 4PM 5PM  
SKY (%).........70 77  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).0 0  
TEMP............59 58  
RH..............23 23  
20 FT WIND DIR..W W  
20 FT WIND SPD..12 12  
20 FT WIND GUST.18 18  
MIX HGT (KFT)...8.7 9.0  
TRANSP WIND DIR.W W  
TRANSP WIND SPD.26 26  
LVORI...........1 1  
ADI.............97 98  
HAINES INDEX....5 5  
VRATE KT-FT/1K..199 206  
VENTRATE CAT....EXL EXL  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (50-60 PERCENT) THEN BECOMING  
MOSTLY CLEAR (15-25 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
MIN TEMPERATURE.....AROUND 32.  
MAX HUMIDITY........78 PERCENT.  
WIND (20 FT)........WEST WINDS 5 TO 10 MPH EARLY IN THE EVENING  
BECOMING LIGHT.  
MIXING HEIGHT.......500 FT AGL.  
TRANSPORT WINDS.....WEST 14 TO 21 MPH DECREASING TO 3 TO 8 MPH  
EARLY IN THE EVENING.  
SMOKE DISPERSAL.....EXCELLENT (62600 KNOT-FT) DECREASING TO FAIR  
(22500 KNOT-FT) EARLY IN THE EVENING DECREASING  
TO POOR (1800 KNOT-FT) LATE IN THE NIGHT EARLY  
IN THE EVENING.  
LVORI...............2.  
ADI.................74 DECREASING TO 6.  
HAINES INDEX........4 TO 5 OR LOW TO MODERATE POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........56 35 14 11 9 6 5 4 3 2 2 1  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0  
TEMP............56 54 50 47 44 42 40 38 36 35 34 34  
RH..............27 31 39 43 51 55 62 67 72 75 78 75  
20 FT WIND DIR..W W W W W W W W W W W W  
20 FT WIND SPD..9 7 6 5 4 4 4 4 4 4 3 3  
20 FT WIND GUST.14 11 7 7 6 6 6 6 6 6 5 5  
MIX HGT (KFT)...7.2 5.4 3.6 2.8 2.1 1.3 1.1 0.9 0.7 0.6 0.5 0.5  
TRANSP WIND DIR.W W W W W W W W W W W W  
TRANSP WIND SPD.21 14 7 6 7 8 7 5 3 3 3 5  
LVORI...........1 2 2 2 2 2 3 3 3 3 3 3  
ADI.............74 9 3 3 3 4 3 2 2 2 2 2  
HAINES INDEX....5 5 5 5 4 4 4 5 5 5 4 4  
VRATE KT-FT/1K..131 63 23 15 13 9 6 4 2 2 2 2  
VENTRATE CAT....VGD GD PR PR PR PR PR PR PR PR PR PR  
   
FRIDAY
 
 
SKY/WEATHER.........SUNNY (20-30 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
MAX TEMPERATURE.....AROUND 64.  
MIN HUMIDITY........27 PERCENT.  
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHWEST 5 TO 8 MPH LATE  
IN THE MORNING.  
MIXING HEIGHT.......5400 FT AGL.  
TRANSPORT WINDS.....WEST 5 TO 13 MPH SHIFTING TO THE SOUTHWEST  
AROUND 15 MPH LATE IN THE AFTERNOON.  
SMOKE DISPERSAL.....POOR (2400 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO EXCELLENT (70000 KNOT-FT) IN THE  
AFTERNOON.  
LVORI...............3.  
ADI.................4 INCREASING TO 60.  
HAINES INDEX........4 TO 6 OR LOW TO HIGH POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........1 1 11 26 46 41  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0  
TEMP............34 39 50 58 62 63  
RH..............78 70 42 32 28 27  
20 FT WIND......W 3 W 3 W 4 W 5 W 6 W 6  
20 FT WIND GUST.5 5 6 7 8 10  
MIX HGT (FT)....600 1000 3400 4800 5200 5300  
TRANSPORT WIND..W 5 W 5 W 8 W 12 W 12 W 15  
LVORI...........4 3 2 1 1 1  
ADI.............2 6 29 44 48 63  
HAINES INDEX....4 5 5 5 6 5  
VRATE KT-FT/1K..2 4 25 46 52 68  
VENTRATE CAT....POOR POOR POOR FAIR FAIR GOOD  
 

 
FORECASTER...FISHER  
REQUESTED BY...DENNIS GASTON  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2110150.0/AKQ  
.DELDT 04/22/21  
.FORMATTERVERSION 1.0.26  
.EMAIL DENNIS.GASTON@DOF.VIRGINIA.GOV  
 
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