FNUS73 KLBF 202047 FWSLBF SPOT FORECAST FOR OVERLOOK...FT. NIOBRARA NWR NATIONAL WEATHER SERVICE NORTH PLATTE NE 347 PM CDT THU MAY 20 2010 FORECAST IS BASED ON IGNITION TIME OF 1450 MDT ON MAY 21. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... FRIDAY THE UPPER RIDGE WILL BUILD EAST WHILE SURFACE WINDS TURN SOUTH AS THE SURFACE HIGH BUILDS EAST AND WEAKENS. TEMPERATURES WILL BEGIN TO REBOUND FRIDAY AS A SOUTHWEST FLOW ALOFT BRINGS WARMER AIR TO THE REGION. BY EVENING THE NEXT AREA OF LOW PRESSURE WILL BEGIN TO ORGANIZE ACROSS THE CONTINENTAL DIVIDE WITH A LEESIDE TROUGH FORMING NORTH TO SOUTH ON THE HIGH PLAINS...FROM THE PANHANDLE TO AREAS SOUTH. THUNDERSTORMS MAY DEVELOP BY EVENING IN THE WEST WHERE THERE IS A SLIGHT RISK FOR SEVERE STORMS. .FRIDAY... SKY/WEATHER.........MOSTLY SUNNY. AREAS OF FOG EARLY IN THE MORNING. TEMPERATURE.........73 AT IGNITION...MAX 74. MIN HUMIDITY........48 PERCENT AT IGNITION...MIN 48 PERCENT. WIND (EYE LEVEL)....SOUTH WINDS 5 TO 6 MPH IN THE MORNING BECOMING LIGHT...THEN BECOMING SOUTHEAST 5 TO 8 MPH EARLY IN THE AFTERNOON. WIND (20 FT)........WINDS SOUTHEAST AT 7 MPH AT IGNITION...OTHERWISE SOUTH WINDS 5 TO 6 MPH IN THE MORNING BECOMING LIGHT...THEN BECOMING SOUTHEAST 5 TO 8 MPH EARLY IN THE AFTERNOON. LAL.................1. HAINES INDEX........2 VERY LOW AT IGNITION...MAX 3. MIXING HEIGHT.......0-1900 FT AGL UNTIL 1000. 7400 FT AGL AT IGNITION...OTHERWISE 7300-7400 FT AGL AFTER 1500. TRANSPORT WINDS.....SOUTH 6 TO 14 MPH. SMOKE DISPERSAL.....POOR TO FAIR INCREASING TO GOOD TO GOOD LATE IN THE AFTERNOON. TIME (MDT) 2 PM 4 PM SKY (%).........43 42 WEATHER COV..... WEATHER TYPE....NONE NONE TEMP............72 73 RH..............48 48 20 FT WIND......SE 5 SE 6 20 FT WIND GUST. 15 EYE LEVEL WIND..SE 5 SE 6 EYE LEVEL WIND.. 15 HAINES INDEX....2 2 .FRIDAY NIGHT... SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. MIN TEMPERATURE.....57. MAX HUMIDITY........86 PERCENT. WIND (EYE LEVEL)....SOUTH WINDS 8 TO 16 MPH. WIND (20 FT)........SOUTH WINDS 8 TO 16 MPH. GUSTS UP TO 25 MPH INCREASING TO 30 MPH AFTER MIDNIGHT. LAL.................1 INCREASING TO 4 AFTER MIDNIGHT. HAINES INDEX........2 TO 3 OR VERY LOW. MIXING HEIGHT.......4900-6800 FT AGL UNTIL 2100. 1300-1600 FT AGL AFTER 2400. TRANSPORT WINDS.....SOUTH 16 TO 25 MPH INCREASING TO 21 TO 29 MPH IN THE LATE EVENING AND OVERNIGHT...THEN DECREASING TO AROUND 18 MPH EARLY IN THE MORNING. SMOKE DISPERSAL.....FAIR TO GOOD DECREASING TO POOR TO POOR AFTER MIDNIGHT. TIME (MDT) 5 PM 7 PM 9 PM 11 PM 1 AM 3 AM SKY (%).........42 44 53 62 63 61 WEATHER COV..... CHANCE CHANCE WEATHER TYPE....NONE NONE NONE NONE RNSHWR RNSHWR TEMP............73 70 65 63 61 59 RH..............49 55 68 72 78 83 20 FT WIND......SE 8 SE 9 SE 10 SE 12 S 11 S 7 20 FT WIND GUST.15 20 20 30 25 15 EYE LEVEL WIND..SE 8 SE 9 SE 10 SE 12 S 11 S 7 EYE LEVEL WIND..15 20 20 30 25 15 HAINES INDEX....3 3 3 3 3 2 .SATURDAY... SKY/WEATHER.........PARTLY SUNNY. CHANCE OF SHOWERS AND THUNDERSTORMS EARLY IN THE MORNING. MAX TEMPERATURE.....85. MIN HUMIDITY........37 PERCENT. WIND (EYE LEVEL)....SOUTHEAST WINDS 7 TO 10 MPH. WIND (20 FT)........SOUTHEAST WINDS 7 TO 10 MPH. LAL.................4 DECREASING TO 1. HAINES INDEX........3 TO 4 OR VERY LOW TO LOW. MIXING HEIGHT.......1300-2000 FT AGL. TRANSPORT WINDS.....SOUTHEAST 10 TO 17 MPH. SMOKE DISPERSAL.....POOR TO POOR. TIME (MDT) 5 AM 7 AM 9 AM 11 AM 1 PM 3 PM SKY (%).........58 56 54 51 50 48 WEATHER COV.....CHANCE WEATHER TYPE....RNSHWR NONE NONE NONE NONE NONE TEMP............58 62 70 77 82 84 RH..............86 75 61 50 43 38 20 FT WIND......SE 6 SE 6 SE 7 SE 6 SE 6 SE 7 20 FT WIND GUST.10 15 15 10 10 15 EYE LEVEL WIND..SE 6 SE 6 SE 7 SE 6 SE 6 SE 7 EYE LEVEL WIND..10 15 15 10 10 15 HAINES INDEX....3 3 4 4 4 4 $$ FORECASTER...KECK REQUESTED BY...TROY DAVIS TYPE OF REQUEST...PRESCRIBED .TAG 20100521.OVERL.01/LBF