FNUS73 KLBF 242200 FWSLBF SPOT FORECAST FOR WENTWORTH...NATIONAL PARK SERVICE NATIONAL WEATHER SERVICE NORTH PLATTE NE 500 PM CDT TUE JUL 24 2012 FORECAST IS BASED ON REQUEST TIME OF 1540 MDT ON JULY 24. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. ...RED FLAG WARNING IN EFFECT UNTIL 10 PM CDT THIS EVENING... ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT THIS EVENING... .DISCUSSION... ABNORMALLY WARM TEMPERATURES WILL COMBINE WITH CRITICAL RELATIVE HUMIDITY TO CONTINUE TO BRING EXTREME FIRE CONDITIONS LATE THIS AFTERNOON AND EVENING. A RED FLAG WARNING IS IN EFFECT UNTIL 10 PM CDT FOR ALL OF WESTERN AND NORTH CENTRAL NEBRASKA. HUMIDITY VALUES WILL INCREASE WITH THE SETTING SUN...HOWEVER SOUTHERLY WIND GUSTS OF UP TO 25 MPH CAN BE EXPECTED INTO LATE EVENING...THEN SLOWLY WEAKEN INTO THE OVERNIGHT. A WEAK FRONTAL BOUNDARY IS STILL EXPECTED TO PASS OVER THE FIRE LATE TONIGHT. LATEST NEAR TERM MODEL GUIDANCE PLACES THIS FRONT THROUGH THE FIRE ZONE SOMETIME AFTER MIDNIGHT...BUT BEFORE 2 AM CDT. A DISTINCT WIND SHIFT TO THE NORTHWEST WILL BE EXPECTED WITH THE FRONTAL PASSAGE. ALSO NOTE THAT THUNDERSTORMS...POSSIBLY DRY...MAY BE A CONCERN WITH THE FRONTAL PASSAGE. OVERALL STORM COVERAGE WILL BE ISOLATED...BUT IF A STORM WERE TO EFFECT THE FIRE...GUSTY ERRATIC WIND WOULD BE EXPECTED. LOOKING AHEAD TO WEDNESDAY...INCREASING ATMOSPHERIC MOISTURE AND SLIGHTLY COOLER TEMPERATURES WILL HELP DECREASE THE THREAT OF EXTREME FIRE BEHAVIOR...BUT GUSTY NORTHWESTERLY FLOW BEHIND THE FRONTAL BOUNDARY WILL BE EXPECTED THROUGH EARLY AFTERNOON. .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. MIN TEMPERATURE.....AROUND 71. MAX HUMIDITY........76 PERCENT. EYE LEVEL WINDS.....SOUTH WINDS 5 TO 13 MPH SHIFTING TO THE NORTHWEST 6 TO 10 MPH LATE IN THE EVENING. WIND (20 FT)........SOUTH WINDS 5 TO 13 MPH WITH GUSTS TO AROUND 25 MPH SHIFTING TO THE NORTHWEST 6 TO 10 MPH LATE IN THE EVENING. LAL.................1 INCREASING TO 3 AFTER MIDNIGHT. HAINES INDEX........6 HIGH. MIXING HEIGHT.......11300 FT AGL UNTIL 2000. 0-200 FT AGL AFTER 2200. TRANSPORT WINDS.....SOUTH 9 TO 17 MPH SHIFTING TO THE NORTHWEST 2 TO 9 MPH IN THE LATE EVENING AND OVERNIGHT. SMOKE DISPERSAL.....EXCELLENT DECREASING TO POOR. TIME (MDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%).........34 37 42 45 44 44 WEATHER COV..... S CHC S CHC S CHC WEATHER TYPE....NONE NONE NONE TSTORM TSTORM TSTORM TEMP............103 91 84 80 77 75 RH..............18 31 43 54 62 69 20 FT WIND......S 10 S 5 S 4 NW 6 N 6 N 7 20 FT WIND GUST.25 10 5 10 10 15 EYE LEVEL WIND..S 10 S 5 S 4 NW 6 N 6 N 7 EYE LEVEL WIND..25 10 5 10 10 15 HAINES INDEX....6 6 6 6 6 6 .WEDNESDAY... SKY/WEATHER.........MOSTLY SUNNY. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. MAX TEMPERATURE.....AROUND 90. MIN HUMIDITY........40 PERCENT. EYE LEVEL WINDS.....NORTH WINDS 5 TO 11 MPH UNTIL LATE AFTERNOON BECOMING LIGHT...THEN BECOMING NORTH AROUND 5 MPH LATE IN THE AFTERNOON. WIND (20 FT)........NORTH WINDS 5 TO 11 MPH UNTIL LATE AFTERNOON BECOMING LIGHT...THEN BECOMING NORTH AROUND 5 MPH LATE IN THE AFTERNOON. LAL.................3. HAINES INDEX........4 LOW. MIXING HEIGHT.......500-1800 FT AGL UNTIL 0900. 5600-6400 FT AGL AFTER 1500. TRANSPORT WINDS.....NORTH 14 TO 20 MPH INCREASING TO 25 TO 31 MPH EARLY IN THE MORNING...THEN DECREASING TO 14 TO 20 MPH EARLY IN THE AFTERNOON SHIFTING TO THE NORTHWEST 9 TO 12 MPH LATE IN THE AFTERNOON. SMOKE DISPERSAL.....POOR INCREASING TO VERY GOOD EARLY IN THE MORNING...THEN DECREASING TO GOOD EARLY IN THE AFTERNOON. TIME (MDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM SKY (%).........43 46 51 54 53 52 WEATHER COV.....S CHC S CHC S CHC S CHC S CHC S CHC WEATHER TYPE....TSTORM TSTORM TSTORM TSTORM TSTORM TSTORM TEMP............72 77 82 86 88 89 RH..............76 67 56 50 45 41 20 FT WIND......NW 9 NW 9 NW 8 N 6 N 4 N 3 20 FT WIND GUST.20 20 15 10 5 5 EYE LEVEL WIND..NW 9 NW 9 NW 8 N 6 N 4 N 3 EYE LEVEL WIND..20 20 15 10 5 5 HAINES INDEX....4 4 4 4 4 4 $$ FORECASTER...JACOBS REQUESTED BY...ALPINE IHC TYPE OF REQUEST...WILDFIRE .TAG 20120724.WENTW.01/LBF