140  
FNUS74 KLCH 201810 AAA  
FWSLCH  
 
SPOT FORECAST FOR C-57...UPDATED  
NATIONAL WEATHER SERVICE LAKE CHARLES LA  
1210 PM CST TUE FEB 20 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 CST ON FEBRUARY 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE AT (337) 477-5285, IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
..WIND ADVISORY IN EFFECT UNTIL 6 PM CST THIS EVENING
 
 
   
DISCUSSION
 
A TIGHT PRESSURE GRADIENT BETWEEN A LOW OVER THE SOUTHERN  
PLAINS AND A HIGH OVER THE WESTERN ATLANTIC WILL CREATE BREEZY AND  
GUSTY SOUTH WINDS FOR THE REMAINDER OF THE AFTERNOON. ALSO...AS A  
FRONT APPROACHES THE REGION, SCATTERED MAINLY LIGHT SHOWERS WILL FORM  
THIS AFTERNOON. THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS, ALTHOUGH  
THE BETTER CHANCE FOR STORMS WITH LIGHTNING WILL TO YOUR WEST.  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). SLIGHT CHANCE OF  
SHOWERS.  
MAX TEMPERATURE.....AROUND 82.  
MIN HUMIDITY........58 PERCENT.  
EYE LEVEL WINDS.....SOUTH WINDS AROUND 10 MPH. GUSTS UP TO 20 MPH.  
WIND (20 FT)........SOUTH WINDS 13 TO 17 MPH. GUSTS UP TO 30 MPH  
LATE IN THE MORNING.  
MIXING HEIGHT.......3500-5400 FT AGL DECREASING TO 1900 FT AGL LATE  
IN THE AFTERNOON.  
TRANSPORT WINDS.....SOUTH 20 TO 28 MPH DECREASING TO AROUND 12 MPH  
LATE IN THE AFTERNOON.  
 
TIME (CST) 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........73 76 80 83 80 78  
WEATHER COV.....SCH SCH SCH SCH SCH SCH  
WEATHER TYPE....RW RW RW RW RW RW  
TSTM COV........  
TEMP............80 82 82 81 80 77  
RH..............62 58 58 60 62 71  
20 FT WIND DIR..S S S S S S  
20 FT WIND SPD..16 17 16 16 15 13  
20 FT WIND GUST.25 30 25 25 25 25  
EYE LVL WND DIR.S S S S S S  
EYE LVL WND SPD.10 10 10 9 8 8  
EYE LVL WND GST.20 20 20 20 20 20  
MIX HGT (KFT)...5.4 5.3 5.2 5.1 3.5 1.9  
TRANSP WIND DIR.S S S S S S  
TRANSP WIND SPD.28 28 28 25 20 12  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). CHANCE OF  
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS.  
MIN TEMPERATURE.....AROUND 67.  
MAX HUMIDITY........100 PERCENT.  
EYE LEVEL WINDS.....SOUTH WINDS AROUND 5 MPH.  
WIND (20 FT)........SOUTH WINDS 5 TO 12 MPH.  
MIXING HEIGHT.......300-600 FT AGL.  
TRANSPORT WINDS.....SOUTH 7 TO 15 MPH.  
 
TIME (CST) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........75 79 81 80 76 83  
WEATHER COV.....CHANCE CHANCE CHANCE CHANCE CHANCE CHANCE  
WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR  
TSTM COV........S CHC S CHC S CHC S CHC S CHC S CHC  
TEMP............75 72 69 67 67 68  
RH..............76 87 97 100 100 100  
20 FT WIND......S 12 S 9 S 8 S 7 S 6 S 6  
20 FT WIND GUST.20 15 15 10 10 10  
EYE LEVEL WIND..S 7 S 5 S 4 S 4 S 4 S 4  
EYE LVL WND GST.20 10 10 10 10 10  
MIX HGT (FT)....300 400 500 600 500 500  
TRANSPORT WIND..S 7 S 10 S 15 S 14 S 10 S 8  
   
WEDNESDAY
 
 
SKY/WEATHER.........CLOUDY (90-100 PERCENT). SHOWERS AND  
THUNDERSTORMS.  
MAX TEMPERATURE.....AROUND 77.  
MIN HUMIDITY........74 PERCENT.  
EYE LEVEL WINDS.....SOUTH WINDS AROUND 5 MPH.  
WIND (20 FT)........SOUTH WINDS 5 TO 8 MPH. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS.  
MIXING HEIGHT.......400-1300 FT AGL.  
TRANSPORT WINDS.....SOUTH 8 TO 17 MPH.  
 
TIME (CST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........90 91 92 92 93 93 94 94 95 95 96 96  
WEATHER COV.....DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF  
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW  
TSTM COV........DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF DEF  
TEMP............67 67 67 68 70 74 76 77 77 76 76 75  
RH..............100 100 100 100 93 82 76 74 74 76 76 79  
20 FT WIND DIR..S S S S S S S S S S S S  
20 FT WIND SPD..5 5 5 6 7 7 8 8 8 8 8 7  
20 FT WIND GUST.10 10 10 10 10 10 15 15 15 15 15 10  
EYE LVL WND DIR.S S S S S S S S S S S S  
EYE LVL WND SPD.3 3 3 4 4 4 4 4 4 4 4 4  
EYE LVL WND GST.10 10 10 10 10 10 10 10 10 10 10 10  
MIX HGT (KFT)...0.4 0.7 1.0 1.3 1.1 0.9 0.7 0.8 0.9 1.0 0.8 0.5  
TRANSP WIND DIR.SE S S S S S S S S S S S  
TRANSP WIND SPD.8 12 15 17 16 15 13 13 13 13 12 9  
 

 
FORECASTER...RUA  
REQUESTED BY...CHARLES MEYER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1802163.0/LCH  
.EMAIL CHARLESMEYER@FS.FED.US  
 
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