FNUS74 KEWX 211635 FWSEWX SPOT FORECAST FOR POAST OAK SOUTH RX...US FISH AND WILDLIFE SERVICE NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 1035 AM CST THU FEB 21 2013 FORECAST IS BASED ON IGNITION TIME OF 1200 CST ON FEBRUARY 21. IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER SERVICE. ...RED FLAG WARNING IN EFFECT UNTIL 6 PM CST THIS EVENING... .DISCUSSION... A RED FLAG WARNING IS IN EFFECT FOR CRITICAL FIRE WEATHER CONDITIONS ACROSS AREAS FROM THE I-35 CORRIDOR WEST TO THE RIO GRANDE FROM LATE MORNING THROUGH AFTERNOON. IN THE WAKE OF A COLD FRONTAL PASSAGE THIS MORNING...20-FOOT WEST TO NORTHWEST WINDS OF 15 TO 20 MPH WITH GUSTS TO 30 MPH AND RELATIVE HUMIDITIES FALLING INTO THE TEENS CAN BE EXPECTED. WITH TEMPERATURES OVERNIGHT FALLING INTO THE LOWER 40S EXPECT GOOD RELATIVE HUMIDITY RECOVERY WITH RH CLIMBING BACK ABOVE 55 PERCENT. COOLER TEMPERATURES FRIDAY WILL KEEP RH ABOVE 30 PERCENT DURING THE AFTERNOON. .REST OF TODAY... SKY/WEATHER.........SUNNY (15-25 PERCENT). TEMPERATURE.........69 AT IGNITION...MAX 74. RH..................25 PERCENT AT IGNITION...MIN 16 PERCENT. EYE LEVEL WINDS.....WEST WINDS 10 TO 18 MPH. WIND (20 FT)........WINDS WEST AT 17 MPH AT IGNITION...OTHERWISE WEST WINDS 10 TO 18 MPH. GUSTS UP TO 30 MPH IN THE AFTERNOON. CWR.................0 PERCENT. LAL.................1. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH AT IGNITION...MAX 5. MIXING HEIGHT.......3900 FT AGL AT IGNITION...OTHERWISE 3900-4800 FT AGL. TRANSPORT WINDS.....WEST 31 TO 35 MPH. TIME (CST) NOON 2 PM 4 PM SKY (%).........23 23 14 WEATHER COV..... WEATHER TYPE....NONE NONE NONE TEMP............69 73 71 RH..............25 18 17 20 FT WIND......280/18 270/17 270/15 20 FT WIND GUST.30 30 25 EYE LEVEL WIND..280/14 270/14 270/12 EYE LEVEL WIND..30 30 25 HAINES INDEX....4 5 5 .TONIGHT... SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT). TEMPERATURE.........MIN 43. RH..................MAX 59 PERCENT. EYE LEVEL WINDS.....WEST WINDS 5 TO 8 MPH EARLY IN THE EVENING BECOMING LIGHT...THEN BECOMING NORTH 5 TO 8 MPH AFTER MIDNIGHT. WIND (20 FT)........WEST WINDS 5 TO 8 MPH EARLY IN THE EVENING BECOMING LIGHT...THEN BECOMING NORTH 5 TO 8 MPH AFTER MIDNIGHT. CWR.................0 PERCENT. LAL.................1. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3000-4900 FT AGL DECREASING TO 1200-2600 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....WEST 23 TO 28 MPH DECREASING TO 13 TO 18 MPH EARLY IN THE EVENING...THEN DECREASING TO 3 TO 7 MPH LATE IN THE EVENING SHIFTING TO THE NORTHEAST AFTER MIDNIGHT. TIME (CST) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%).........12 12 22 21 21 19 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............65 57 53 50 49 46 RH..............24 29 33 36 40 47 20 FT WIND......270/8 240/5 250/3 300/3 330/5 350/7 20 FT WIND GUST.10 10 5 5 10 10 EYE LEVEL WIND..270/6 240/4 250/3 300/3 330/4 350/5 EYE LEVEL WIND..10 10 5 5 10 10 HAINES INDEX....5 5 5 5 5 5 .FRIDAY... SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). TEMPERATURE.........MAX 61. RH..................MIN 32 PERCENT. EYE LEVEL WINDS.....NORTHEAST WINDS 8 TO 12 MPH. WIND (20 FT)........NORTHEAST WINDS 8 TO 12 MPH. CWR.................10 PERCENT. LAL.................1. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1100-1900 FT AGL. TRANSPORT WINDS.....NORTHEAST 8 TO 10 MPH. TIME (CST) 6 AM 8 AM 10 AM NOON 2 PM 4 PM SKY (%).........28 28 28 34 34 34 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............44 44 48 56 60 61 RH..............57 55 46 37 32 32 20 FT WIND......010/9 010/10 010/10 010/9 020/9 020/9 20 FT WIND GUST.15 15 15 15 15 15 EYE LEVEL WIND..010/7 010/8 010/8 010/6 020/7 020/6 EYE LEVEL WIND..15 15 15 15 15 15 HAINES INDEX....5 5 5 5 5 5 $$ FORECASTER...05 REQUESTED BY...ROB VERNACHIO TYPE OF REQUEST...PRESCRIBED .TAG 20130221.POAST.01/EWX