734  
FNUS74 KHUN 181211  
FWSHUN  
 
SPOT FORECAST FOR EDNA HILL...NATIONAL PARK SERVICE  
NATIONAL WEATHER SERVICE HUNTSVILLE AL  
711 AM CDT THU APR 18 2019  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 CDT ON APRIL 18.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
SW WINDS WILL INCREASE TODAY AHEAD OF A STRONG COLD FRONT APPROACHING  
THE AREA FROM THE WEST. THESE STRONG WINDS WILL CREATE VERY GOOD  
DISPERSION VALUES AS GUSTS AS HIGH AS 20-30 MPH ARE POSSIBLE, ESPECIALLY  
THIS AFTERNOON. MIN RH VALUES WILL BOTTOM OUT AROUND 40 PERCENT, WITH  
MIXING HEIGHTS PEAKING AT 5 KFT OR SO IN THE AFTERNOON. THE FRONT WILL  
APPROACH THE AL/MS BORDER, AND IT WILL GENERATE CLUSTERS OF SHOWERS  
AND THUNDERSTORMS THAT WILL PRODUCE WETTING RAINS ACROSS THE REGION  
THIS EVENING AND INTO THE OVERNIGHT HOURS.  
 
   
REST OF TODAY
 
 
SKY/WEATHER.........PARTLY SUNNY (60-70 PERCENT).  
TEMPERATURE.........64 AT IGNITION...MAX 79.  
RH..................75 PERCENT AT IGNITION...MIN 44 PERCENT.  
WIND (20 FT)........WINDS SOUTH AT 8 MPH AT IGNITION...OTHERWISE  
SOUTH WINDS 8 TO 16 MPH. GUSTS UP TO 29 MPH IN  
THE AFTERNOON.  
CWR.................10 PERCENT.  
CHANCE OF PCPN......10 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......900 FT AGL AT IGNITION...OTHERWISE 5800 FT AGL.  
TRANSPORT WINDS.....SOUTH 14 TO 20 MPH INCREASING TO 21 TO 26 MPH  
IN THE LATE MORNING AND AFTERNOON.  
LVORI...............3.  
 
TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........MC MC MC MC MC MC MC MC MC MC  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............64 66 70 73 75 76 78 79 79 78  
RH..............75 73 66 57 54 50 47 44 44 47  
20 FT WIND DIR..170 180 180 180 180 190 180 180 170 170  
20 FT WIND SPD..8 9 9 10 13 14 14 15 16 16  
20 FT WIND GUST.10 11 13 14 17 18 19 21 23 23  
MIX HGT (KFT)...0.9 1.7 2.4 2.7 3.0 3.3 4.1 5.0 5.8 4.0  
TRANSP WIND DIR.150 180 190 190 190 190 190 180 180 170  
TRANSP WIND SPD.14 20 24 25 25 24 25 26 26 21  
DISPERSION IDX..12 22 32 57 60 60 71 81 86 57  
LVORI...........4 4 1 1 1 1 1 1 1 1  
CWR.............10 0 0 0 0 0 0 0 0 10  
CHC OF PCPN (%).10 0 0 0 0 0 0 0 0 10  
LAL.............1 1 1 1 1 1 1 1 1 1  
   
TONIGHT
 
 
SKY/WEATHER.........CLOUDY (90-100 PERCENT). SHOWERS AND  
THUNDERSTORMS THROUGH THE NIGHT.  
TEMPERATURE.........MIN 53.  
RH..................MAX 93 PERCENT.  
WIND (20 FT)........SOUTHWEST WINDS 12 TO 16 MPH. GUSTS UP TO 29  
MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR  
THUNDERSTORMS EARLY IN THE EVENING. GUSTY AND  
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS  
OVERNIGHT.  
CWR.................10 PERCENT INCREASING TO 30 PERCENT EARLY IN  
THE EVENING, THEN INCREASING TO 50 PERCENT LATE  
IN THE EVENING INCREASING TO 70 PERCENT LATE IN  
THE EVENING INCREASING TO 80 PERCENT INCREASING  
TO 90 PERCENT OVERNIGHT DECREASING TO 80  
PERCENT.  
CHANCE OF PCPN......90 PERCENT.  
LAL.................1 UNTIL 2000, THEN 3 UNTIL 2200, THEN 4 UNTIL  
2300, THEN 5 UNTIL 0100, THEN 4 UNTIL 0400,  
THEN 2.  
MIXING HEIGHT.......300 FT AGL.  
TRANSPORT WINDS.....SOUTH 12 TO 16 MPH INCREASING TO 24 TO 32 MPH  
IN THE LATE EVENING AND OVERNIGHT, THEN  
DECREASING TO AROUND 21 MPH EARLY IN THE  
MORNING.  
LVORI...............3.  
 
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY  
WEATHER COV..... CHC CHC LKY DEF DEF DEF DEF DEF DEF DEF  
WEATHER TYPE.... RW RW RW RW RW RW RW RW RW RW  
TEMP............76 74 72 69 67 65 64 63 63 62 61 59  
RH..............50 53 57 66 70 75 81 81 87 90 93 93  
20 FT WIND DIR..170 170 170 170 170 170 180 180 180 190 200 210  
20 FT WIND SPD..16 16 16 15 15 15 15 15 14 13 14 12  
20 FT WIND GUST.23 23 22 22 20 20 21 20 18 17 17 14  
MIX HGT (KFT)...2.1 0.3 0.6 1.0 1.3 1.3 1.3 1.2 1.0 0.8 0.5 0.7  
TRANSP WIND DIR.170 160 170 170 170 170 170 170 170 170 160 200  
TRANSP WIND SPD.15 12 16 24 31 32 30 28 28 26 25 21  
DISPERSION IDX..30 5 15 30 47 48 27 25 25 24 23 19  
LVORI...........1 2 2 2 3 3 3 4 4 4 5 5  
CWR.............10 10 30 50 70 80 90 90 90 90 90 80  
CHC OF PCPN (%).10 10 30 50 70 80 90 90 90 90 90 80  
LAL.............1 1 3 3 4 5 5 4 4 4 2 2  
   
FRIDAY
 
 
SKY/WEATHER.........CLOUDY (85-95 PERCENT). SLIGHT CHANCE OF  
THUNDERSTORMS EARLY IN THE MORNING. RAIN  
SHOWERS LIKELY THROUGH THE DAY.  
TEMPERATURE.........MAX 55.  
RH..................MIN 74 PERCENT.  
WIND (20 FT)........WEST WINDS 8 TO 9 MPH. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS EARLY IN THE  
MORNING.  
CWR.................70 PERCENT DECREASING TO 60 PERCENT.  
CHANCE OF PCPN......70 PERCENT.  
LAL.................2 UNTIL 0700, THEN 1.  
MIXING HEIGHT.......3200 FT AGL.  
TRANSPORT WINDS.....WEST 12 TO 21 MPH INCREASING TO 23 TO 28 MPH IN  
THE AFTERNOON.  
LVORI...............4.  
 
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY MC MC  
WEATHER COV.....LKY LKY LKY LKY LKY LKY LKY LKY LKY LKY LKY LKY  
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW  
TEMP............57 55 55 53 54 54 53 53 53 52 52 51  
RH..............93 90 86 86 83 80 80 80 74 74 74 74  
20 FT WIND DIR..240 260 260 280 280 280 270 270 270 280 280 280  
20 FT WIND SPD..9 8 8 8 8 8 8 9 9 9 9 9  
20 FT WIND GUST.12 11 10 10 10 11 11 12 12 12 12 12  
MIX HGT (KFT)...0.8 0.9 1.2 1.4 1.7 2.2 2.7 3.2 2.9 2.7 2.4 2.4  
TRANSP WIND DIR.260 290 290 290 290 280 260 260 260 270 270 270  
TRANSP WIND SPD.15 12 12 14 16 18 21 23 25 26 28 26  
DISPERSION IDX..13 10 10 15 18 37 47 57 60 60 59 57  
LVORI...........5 5 5 5 3 3 3 3 3 3 3 3  
CWR.............70 60 60 60 60 60 60 60 60 60 60 60  
CHC OF PCPN (%).70 60 60 60 60 60 60 60 60 60 60 60  
LAL.............2 1 1 1 1 1 1 1 1 1 1 1  
 

 
FORECASTER...PRITCHETT  
REQUESTED BY...ROBERT VICK  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1906416.2/HUN  
.DELDT 04/18/19  
.FORMATTERVERSION 1.0.26  
.EMAIL _VICK@NPS.GOV  
 
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