914  
FNUS73 KJKL 251350  
FWSJKL  
 
SPOT FORECAST FOR LONDON RANGER STATION RX...USDA FS  
NATIONAL WEATHER SERVICE JACKSON, KY  
950 AM EDT SAT MAR 25 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 EDT ON MARCH 25.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
A SLOW MOVING LOW PRESSURE SYSTEM WILL PASS BY TO OUR  
NORTHWEST THIS WEEKEND. THE FLOW AROUND THE SYSTEM WILL BRING SOUTHERLY  
WINDS AND MILD TEMPERATURES. GUSTS WILL REACH AROUND 20 MPH TODAY.  
SHOWERS WILL ARRIVE BY AROUND DAWN ON SUNDAY, WITH THUNDERSTORMS  
ALSO POSSIBLE. NO CHANGE IN AIR MASS WILL OCCUR WITH THE SYSTEM'S  
DEPARTURE, SO IT WILL CONTINUE MILD.  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY, THEN INCREASING CLOUDS LATE.  
CHANCE OF PCPN......10 PERCENT.  
LAL.................1.  
TEMPERATURE.........67 AT IGNITION...MAX 77.  
RH..................47 PERCENT AT IGNITION...MIN 34 PERCENT.  
DEWPOINT............AROUND 46.  
WIND (20 FT)........WINDS SOUTH AT 8 MPH AT IGNITION...OTHERWISE  
SOUTH 7 TO 11 MPH. GUSTS AROUND 20 MPH,  
ESPECIALLY THROUGH MIDDAY.  
MIXING HEIGHT.......2100 FT AGL AT IGNITION...OTHERWISE 2600 TO 4700  
FT AGL.  
TRANSPORT WINDS.....SOUTH 20 MPH AT IGNITION, OTHERWISE SOUTH 20 TO 25  
MPH.  
VENT RATE...........GOOD /35100 KNOT-FT/ AT IGNITION. OTHERWISE,  
GOOD TO EXCELLENT (52900-98800 KNOT-FT) .  
LVORI...............3.  
ADI.................49 AT IGNITION, OTHERWISE 65 TO 83 IN THE  
AFTERNOON...MAX 83.  
HAINES INDEX........3 AT IGNITION, OTHERWISE 3 TO TO 4 OR VERY LOW  
TO LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE  
GROWTH...MAX 4.  
 
TIME (EDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........33 36 44 51 59 61 64 66  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CCH OF PCPN (%).0 0 0 0 0 10 10 10  
LAL.............1 1 1 1 1 1 1 1  
TEMP............67 70 73 74 75 75 76 76  
DEWPOINT........46 47 47 48 48 47 47 47  
RH..............47 44 40 40 38 37 36 36  
20 FT WIND DIR..S S S S S S S S  
20 FT WIND SPD..8 8 8 9 9 9 9 8  
20 FT WIND GUST.16 19 22 20 18 20 20 20  
RIDGE WIND DIR..S S S S S S S S  
RIDGE WIND SPD..10 10 10 15 15 15 15 10  
MIX HGT (KFT)...2.1 2.6 3.2 4.2 4.7 4.7 4.7 4.7  
TRANSP WIND DIR.S S S S S S S S  
TRANSP WIND SPD.20 23 25 25 24 23 22 20  
LVORI...........1 1 1 1 1 1 1 1  
ADI.............49 68 83 72 72 69 65 78  
HAINES INDEX....3 3 3 3 4 3 3 3  
VRATE KT-FT/100035 53 70 92 99 94 89 79  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. A SLIGHT CHANCE OF RAIN SHOWERS  
IN THE EVENING. A CHANCE OF RAIN SHOWERS  
OVERNIGHT, THEN RAIN SHOWERS LIKELY AND A  
SLIGHT CHANCE OF THUNDERSTORMS LATE.  
CHANCE OF PCPN......70 PERCENT.  
LAL.................1 UNTIL 0400, THEN 2.  
TEMPERATURE.........MIN 55.  
RH..................MAX 87 PERCENT.  
DEWPOINT............AROUND 49.  
WIND (20 FT)........SOUTH WINDS 6 TO 8 MPH. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS LATE AT NIGHT.  
MIXING HEIGHT.......2100-4000 FT AGL IN THE EVENING, DECREASING TO  
600-1000 FT AGL.  
TRANSPORT WINDS.....SOUTH 8 TO 16 MPH, BECOMING SOUTHEAST 8 TO 15  
MPH AFTER 0100.  
VENT RATE...........GOOD (56400 KNOT-FT) IN THE EVENING DECREASING TO  
POOR (3900-10600 KNOT-FT) BY LATE IN THE  
EVENING.  
LVORI...............3.  
ADI.................60 DECREASING TO 8.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........65 65 69 74 80 89  
WEATHER COV..... S CHC CHANCE CHANCE LIKELY  
WEATHER TYPE....NONE NONE RNSHWR RNSHWR RNSHWR RNSHWR  
TSTM COV........ S CHC  
CCH OF PCPN (%).10 10 20 30 40 60  
LAL.............1 1 1 1 1 2  
TEMP............73 66 61 58 57 56  
DEWPOINT........47 48 48 48 48 50  
RH..............40 52 62 69 72 80  
20 FT WIND......S 6 S 4 S 4 SE 4 SE 4 S 5  
20 FT WIND GUST.15 10 10 10 10 10  
RIDGETOP WIND...S 10 S 5 S 5 SE 5 SE 5 S 5  
MIX HGT (FT)....4000 2100 1000 600 600 800  
TRANSPORT WIND..S 16 S 10 S 9 S 8 SE 8 SE 14  
LVORI...........1 2 3 3 4 4  
ADI.............60 7 6 5 5 9  
HAINES INDEX....3 3 3 3 3 3  
VRATE KT-FT/100056 19 8 5 4 9  
   
SUNDAY
 
 
SKY/WEATHER.........CLOUDY. RAIN SHOWERS AND A CHANCE OF  
THUNDERSTORMS.  
CHANCE OF PCPN......90 PERCENT.  
LAL.................2 UNTIL 0800, THEN 3.  
TEMPERATURE.........MAX 69.  
RH..................MIN 57 PERCENT.  
DEWPOINT............AROUND 53.  
WIND (20 FT)........SOUTH 5 TO 10 MPH. GUSTS UP TO 20 MPH  
MAINLY BETWEEN 0900 AND 1300. GUSTY AND  
ERRATIC WINDS IN AND NEAR ANY THUNDERSTORMS.  
MIXING HEIGHT.......800-1400 FT AGL IN THE MORNING, BECOMING  
1600-3600 FT AGL IN THE AFTERNOON.  
TRANSPORT WINDS.....SOUTH 15 TO 24 MPH BECOMING SOUTHWEST 23  
TO 26 MPH AROUND 1600.  
VENT RATE...........POOR EARLY (10800 KNOT-FT) BECOMING  
GOOD TO EXCELLENT (46700-82400 KNOT-FT)  
IN THE AFTERNOON.  
LVORI...............5 EARLY, DECREASING TO 1 TO 3.  
ADI.................10-14 EARLY INCREASING TO 41 TO 67 IN THE  
AFTERNOON.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (EDT) 6 AM 9 AM NOON 3 PM  
SKY (%).........96 91 87 83  
WEATHER COV.....LIKELY DEFNTE DEFNTE DEFNTE  
WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR  
TSTM COV........S CHC CHANCE CHANCE CHANCE  
CCH OF PCPN (%).70 90 90 90  
LAL.............2 3 3 3  
TEMP............55 58 65 68  
DEWPOINT........51 52 54 54  
RH..............86 80 68 61  
20 FT WIND......S 5G10 S 5G15 S 6G20 S 7G20  
RIDGETOP WIND...S 5 S 10 S 10 S 15  
MIX HGT (FT)....800 1000 1600 2800  
TRANSPORT WIND..S 15 S 17 S 24 S 24  
LVORI...........5 3 1 1  
ADI.............10 22 41 56  
HAINES INDEX....3 3 3 3  
VRATE KT-FT/100011 15 33 59  
 

 
FORECASTER...JP  
REQUESTED BY...AARON STROBEL  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1705190.0/JKL  
.EMAIL AARONPSTROBEL@FS.FED.US  
 
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