FNUS73 KDLH 041600 FWSDLH SPOT FORECAST FOR DEVILS TRACK...USFS NATIONAL WEATHER SERVICE DULUTH MN 1100 AM CDT WED APR 4 2012 FORECAST IS BASED ON IGNITION TIME OF 1055 CDT ON APRIL 04. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... HIGH PRESSURE BUILDING DOWN FROM HUDSON BAY WILL INTRODUCE VERY DRY AIR INTO THE ARROWHEAD...WE LOWERED RELATIVE HUMIDITIES. WE ALSO RAISED TEMPERATURES TO BE CONSISTENT TO THE HIGHER OBSERVED VALUES...SINCE IN SPITE OF ELEVATION...TEMPERATURES RISE RAPIDLY UNDER COMPLETELY CLEAR SKIES WITH LOW DEW POINTS ACROSS AREAS THAT ARE A LITTLE INLAND FROM LARGE WATER...LAKE SUPERIOR...OR FROM SMALLER WATER SUCH AS DEVIL TRACK LAKE TO THE NORTH. THE PRESSURE GRADIENT FROM THE BUILDING HIGH IS NOT LARGE...SO WINDS WILL NOT BE MUCH OF AN ISSUE TODAY. WITH RAPID COOLING IN THE DRY AIR THIS EVENING...WINDS WILL DROP OFF AND SMOKE DISPERSION WILL BECOME QUITE POOR OVERNIGHT AND EARLY THURSDAY. FOR THE THURSDAY OUTLOOK...THE BUILDING HUDSON BAY HIGH WILL HAVE HAD TIME TO INTENSIFY AND FORM A CENTER OVER LAKE SUPERIOR...SO THAT A FRESHNING LAKE BREEZE WILL GET INLAND AS FAR AS DEVILS TRACK LAKE LATE IN THE AFTERNOON...CAUSING WINDS TO INCREASE AND REMAIN GUSTY UNTIL SUNSET. SKIES WILL REMAIN CLEAR AND DAYTIME RELATIVE HUMIDITY MAY GET RATHER LOW. THE DRY WEATHER AND AFTERNOON ONSHORE...FROM LAKE SUPERIOR...FLOW IS EXPECTED TO CONTINUE FRIDAY. .TODAY... SKY/WEATHER.........SUNNY. MAX TEMPERATURE.....52-56. MIN HUMIDITY........25 PERCENT. WIND (20 FT)........NORTHEAST WINDS 7 TO 9 MPH. MIXING HEIGHT.......1200 FT AGL INCREASING TO 3600 FT AGL LATE IN THE MORNING...THEN INCREASING TO 4500 FT AGL EARLY IN THE AFTERNOON DECREASING TO 3500 FT AGL LATE IN THE AFTERNOON. TRANSPORT WINDS.....NORTH 10 TO 15 MPH BECOMING EAST LATE IN THE AFTERNOON. SMOKE DISPERSAL.....POOR (10800) INCREASING TO GOOD (38000) LATE IN THE MORNING...THEN DECREASING TO FAIR (27300) EARLY IN THE AFTERNOON DECREASING TO POOR (11300) LATE IN THE AFTERNOON. TIME (CDT) 10 AM NOON 2 PM 4 PM 6 PM TEMP............51 53 54 53 50 RH..............34 29 26 26 28 20 FT WIND DIR..NE NE NE NE NE WIND SPD.. 7 8 8 8 8 20 FT WIND GUST.10 13 13 13 13 .TONIGHT... SKY/WEATHER.........CLEAR. AREAS OF FROST AFTER MIDNIGHT. MIN TEMPERATURE.....24-29. MAX HUMIDITY........68 PERCENT. WIND (20 FT)........EAST WINDS 6 TO 9 MPH. MIXING HEIGHT.......1300 FT AGL DECREASING TO 800 FT AGL LATE IN THE EVENING...THEN INCREASING TO 1400 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....SOUTHWEST AROUND 5 MPH BECOMING NORTHWEST LATE IN THE EVENING...THEN BECOMING NORTHEAST AFTER MIDNIGHT. SMOKE DISPERSAL.....POOR (3650) INCREASING TO FAIR (14100) AFTER MIDNIGHT. TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM TEMP............45 39 35 32 30 28 RH..............35 44 54 61 66 68 20 FT WIND DIR..NE NE E E E E 20 FT WIND SPD..8 7 5 5 5 5 20 FT WIND GUST.13 10 8 7 7 7 .THURSDAY... SKY/WEATHER.........SUNNY. AREAS OF FROST EARLY IN THE MORNING. MAX TEMPERATURE.....41-46. MIN HUMIDITY........32 PERCENT. WIND (20 FT)........NORTHEAST WINDS 7 TO 11 MPH BECOMING EAST 12 TO 13 MPH IN THE AFTERNOON. MIXING HEIGHT.......1800 FT AGL INCREASING TO 3700 FT AGL IN THE LATE MORNING AND EARLY AFTERNOON...THEN DECREASING TO 2600 FT AGL LATE IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHEAST 5 TO 10 MPH. SMOKE DISPERSAL.....FAIR (14600) INCREASING TO FAIR (22600) LATE IN THE MORNING...THEN DECREASING TO FAIR (16500) EARLY IN THE AFTERNOON DECREASING TO POOR (12000) LATE IN THE AFTERNOON. TIME (CDT) 7 AM 9 AM 11 AM 1 PM 3 PM 5 PM TEMP............27 32 37 41 43 43 RH..............68 56 44 37 35 33 20 FT WIND DIR..NE NE NE NE E E 20 FT WIND SPD..6 7 9 10 11 12 20 FT WIND GUST.8 10 14 16 18 21 $$ FORECASTER...PETER REQUESTED BY...RYAN KINGSLEY TYPE OF REQUEST...PRESCRIBED .TAG 20120404.DEVIL.01/DLH