FNUS73 KFGF 171350 FWSFGF SPOT FORECAST FOR ARNESON...USFWS NATIONAL WEATHER SERVICE GRAND FORKS ND 850 AM CDT THU MAY 17 2012 FORECAST IS BASED ON IGNITION TIME OF 1300 CDT ON MAY 17. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... A TIGHT PRESSURE GRADIENT WILL CAUSE GUSTY SOUTH TO SOUTHEAST FLOWS TODAY WITH LITTLE INCREASE IN DEW POINTS TODAY. TEMPERATURES AND AFTERNOON RELATIVE HUMIDITIES WILL BE HIGHLY DEPENDENT ON THE CLOUD COVER WHICH PRESENTS A FORECAST CHALLENGE. CURRENT MINIMUM RH IS IN THE LOWER TO MIDDLE 30S PERCENT RANGE BY WE WILL NEED TO MONITOR CLOSELY AS SOME GUIDANCE SUGGESTS RH APPROACHING 20 PERCENT NEAR IGNITION TIME. AN UPDATE WILL BE ISSUED AS NEEDED. WINDS WILL WELL GUST TO OVER 30 MPH PRIOR TO NOON WITH A GRADUAL DECREASE IN SPEEDS AFTERNOON. THE WIND DIRECTION WILL SHIFT TO THE WEST OF SOUTH DURING THE AFTERNOON. SPEEDS WILL CONTINUE TO DIMINISH LATE AFTERNOON INTO THE OVERNIGHT BUT INCREASE AGAIN ON FRIDAY AS LOW PRESSURE TO THE WEST RE-INTENSIFIES. FRIDAY WILL AGAIN BE QUITE WINDY WITH MINIMUM RH UP SLIGHTLY AS DEW POINT TEMPERATURES CLIMB A BIT. HOWEVER AS WITH TODAY THE MINIMUM RH WILL BE HIGHLY DEPENDENT ON THE CLOUD COVER AND AFTERNOON MAXIMUM TEMPERATURES WHICH WILL BE HIGHER THAN TODAY. .TODAY... SKY/WEATHER.........MOSTLY SUNNY. MAX TEMPERATURE.....79-84. MIN HUMIDITY........28-33 PERCENT. WIND (20 FT)........SOUTH WINDS 14 TO 19 MPH. GUSTS UP TO 33 MPH. MIXING HEIGHT.......300 FT AGL INCREASING TO 2500-4100 FT AGL LATE IN THE MORNING. MIXING WINDS........SOUTH 17 TO 25 MPH SHIFTING TO THE SOUTHWEST AROUND 18 MPH LATE IN THE AFTERNOON. TIME (CDT) 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY (%).........38 37 36 35 34 34 33 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TSTM COV........ TEMP............68 71 75 77 79 81 81 RH..............37 36 35 34 33 33 34 20 FT WIND DIR..S S S S S S S 20 FT WIND SPD..19 19 19 19 19 16 11 20 FT WIND GUST.33 30 30 25 25 25 15 .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY. MIN TEMPERATURE.....58-63. MAX HUMIDITY........56-61 PERCENT. WIND (20 FT)........SOUTH WINDS 5 TO 8 MPH EARLY IN THE EVENING BECOMING LIGHT...THEN BECOMING SOUTH 5 TO 9 MPH IN THE LATE EVENING AND OVERNIGHT. MIXING HEIGHT.......2300-3300 FT AGL DECREASING TO 300 FT AGL EARLY IN THE EVENING. MIXING WINDS........SOUTH 8 TO 16 MPH DECREASING TO 5 TO 14 MPH IN THE LATE EVENING AND EARLY MORNING...THEN INCREASING TO AROUND 15 MPH EARLY IN THE MORNING. TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM SKY (%).........33 32 32 32 32 32 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TSTM COV........ TEMP............80 73 68 65 62 60 RH..............34 44 49 53 73 79 20 FT WIND......S 8 S 5 SE 5 S 6 S 7 S 9 20 FT WIND GUST.10 10 10 10 10 15 .FRIDAY... SKY/WEATHER.........MOSTLY SUNNY. MAX TEMPERATURE.....85-90. MIN HUMIDITY........30-35 PERCENT. WIND (20 FT)........SOUTH WINDS 14 TO 19 MPH. GUSTS UP TO 25 MPH EARLY IN THE MORNING. MIXING HEIGHT.......300 FT AGL INCREASING TO 2300-3900 FT AGL IN THE LATE MORNING AND EARLY AFTERNOON...THEN INCREASING TO 3700-5100 FT AGL EARLY IN THE AFTERNOON DECREASING TO 2300 FT AGL LATE IN THE AFTERNOON. MIXING WINDS........SOUTH 15 TO 24 MPH INCREASING TO 25 TO 33 MPH IN THE AFTERNOON. TIME (CDT) 7 AM 10 AM 1 PM 4 PM SKY (%).........32 29 28 32 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TSTM COV........ TEMP............61 72 82 87 RH..............77 54 40 35 20 FT WIND......S 10G15 S 13G20 S 18G25 S 19G25 $$ FORECASTER...EWENS REQUESTED BY...CORY HENRY TYPE OF REQUEST...PRESCRIBED .TAG 20120517.ARNES.02/FGF