Iowa Fire Weather Zone 301

...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM CDT
THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 249...256...257...258...300...301 AND 900... .DISCUSSION... NORTHWESTERLY WINDS ARE EXPECTED TO INCREASE TO 20 TO 25 MPH BY THIS AFTERNOON WITH GUSTS TO 35 MPH ACROSS MOST OF THE AREA. IN ADDITION... WITH GOOD MIXING IN A DRYING ATMOSPHERE...AFTERNOON RELATIVE HUMIDITY WILL RANGE FROM AROUND 20 TO 25 PERCENT...THOUGH SLIGHTLY HIGHER OVER SOUTHWESTERN MINNESOTA. IN LIGHT OF THIS... ELECTED TO UPGRADE THE FIRE WEATHER WATCH TO A RED FLAG WARNING... WHICH COVERS ALL AREAS EXCEPT THE LOWER BRULE REGION IN SOUTH CENTRAL SOUTH DAKOTA THIS AFTERNOON...WHERE SOMEWHAT LIGHTER WINDS ARE EXPECTED IN A WEAKER GRADIENT AS HIGH PRESSURE BUILDS IN FROM THE NORTHWEST. WILL WATCH WIND SPEEDS CLOSELY HOWEVER...AS THE LOWER BRULE WILL ALSO HAVE LOWEST HUMIDITY LEVELS IN THE 15 TO 20 PERCENT RANGE THROUGH PART OF THIS AFTERNOON. THE MOST CRITICAL FIRE DANGER PERIOD WILL BE FROM EARLY AFTERNOON INTO EARLY THIS EVENING. TUESDAY WILL BE ANOTHER DAY TO WATCH FOR FIRE WEATHER CONCERNS... ESPECIALLY IN OUR CENTRAL AND WEST WITH SOUTHEAST-SOUTH LOW LEVEL FLOW INCREASING THROUGH THE DAY AS SURFACE RIDGE SHIFTS EAST...AND STRONG MIXING LEADING TO HUMIDITY LEVELS OF 20 TO 25 PERCENT. WINDS AT THIS TIME LOOK TO REMAIN SHY OF RED FLAG CRITERIA...BUT WILL LIKELY BE ANOTHER DAY OF VERY HIGH DANGER FOR PARTS OF OUR AREA... MAINLY ALONG AND WEST OF THE JAMES RIVER VALLEY. IOWA GREAT LAKES/ROCK AND LITTLE SIOUX BASINS- 507 AM CDT MON APR 21 2014 ...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM CDT THIS EVENING... .TODAY... SKY/WEATHER.........MOSTLY SUNNY. MAX TEMPERATURE.....68-73. MIN HUMIDITY........23-28 PERCENT. 20-FOOT WINDS.......WEST WINDS 7 TO 12 MPH IN THE EARLY MORNING... BECOMING NORTHWEST 21 TO 26 MPH WITH GUSTS TO AROUND 32 MPH IN THE AFTERNOON. HAINES INDEX........5 OR MODERATE. HOURS OF SUN........12 HOURS. PRECIPITATION.......NONE. MIXING HEIGHT.......AROUND 6400 FT AGL (AVE 12-6 PM). TRANSPORT WINDS.....NORTHWEST AROUND 26 MPH (AVE 12-6 PM). SMOKE DISPERSAL.....AROUND 144000 OR EXCELLENT (AVE 12-6 PM). MAX GFDI INDEX......EXTREME. REF EVAPO TRANSP....0.36 TO 0.42 INCHES (20 INCH PLANT CANOPY). .TONIGHT... SKY/WEATHER.........CLEAR. MIN TEMPERATURE.....34-39. MAX HUMIDITY........77-82 PERCENT. 20-FOOT WINDS.......NORTH WINDS 14 TO 19 MPH WITH GUSTS TO AROUND 30 MPH DECREASING TO 5 TO 9 MPH AFTER MIDNIGHT. PRECIPITATION.......NONE. .TUESDAY... SKY/WEATHER.........MOSTLY SUNNY UNTIL 1300...THEN PARTLY CLOUDY. MAX TEMPERATURE.....62-67. MIN HUMIDITY........25-30 PERCENT. 20-FOOT WINDS.......SOUTHEAST WINDS 8 TO 13 MPH. HAINES INDEX........5 OR MODERATE. HOURS OF SUN........10 HOURS. PRECIPITATION.......NONE. MIXING HEIGHT.......AROUND 4700 FT AGL (AVE 12-6 PM). TRANSPORT WINDS.....SOUTHEAST AROUND 5 MPH (AVE 12-6 PM). SMOKE DISPERSAL.....AROUND 19000 OR FAIR (AVE 12-6 PM). MAX GFDI INDEX......MODERATE TO HIGH. REF EVAPO TRANSP....0.19 TO 0.26 INCHES (20 INCH PLANT CANOPY). .FORECAST DAYS 3 THROUGH 7... .TUESDAY NIGHT...MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS AND ISOLATED THUNDERSTORMS. LOWS 45 TO 50. SOUTHEAST WINDS 16 TO 21 MPH WITH GUSTS TO AROUND 29 MPH. CHANCE OF PRECIPITATION 40 PERCENT. .WEDNESDAY...BREEZY. MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS AND ISOLATED THUNDERSTORMS. HIGHS 65 TO 70. SOUTHEAST WINDS 23 TO 28 MPH WITH GUSTS TO AROUND 39 MPH. CHANCE OF PRECIPITATION 50 PERCENT. .WEDNESDAY NIGHT...CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS 50 TO 55. SOUTH WINDS 14 TO 19 MPH WITH GUSTS TO AROUND 28 MPH. CHANCE OF PRECIPITATION 50 PERCENT. .THURSDAY...PARTLY SUNNY. CHANCE OF RAIN SHOWERS AND ISOLATED THUNDERSTORMS. HIGHS 65 TO 70. WEST WINDS 15 TO 20 MPH WITH GUSTS TO AROUND 31 MPH. CHANCE OF PRECIPITATION 50 PERCENT. .THURSDAY NIGHT...COLDER. PARTLY CLOUDY. LOWS 40 TO 45. WEST WINDS 13 TO 18 MPH WITH GUSTS TO AROUND 28 MPH. .FRIDAY...COOLER. PARTLY SUNNY. HIGHS 50 TO 55. NORTHWEST WINDS 15 TO 20 MPH WITH GUSTS TO AROUND 30 MPH. .FRIDAY NIGHT...PARTLY CLOUDY. LOWS 30 TO 35. NORTH WINDS 14 TO 19 MPH WITH GUSTS TO AROUND 28 MPH. .SATURDAY...PARTLY CLOUDY. CHANCE OF RAIN SHOWERS AND ISOLATED THUNDERSTORMS. HIGHS 50 TO 55. NORTHEAST WINDS 10 TO 15 MPH WITH GUSTS TO AROUND 24 MPH. CHANCE OF PRECIPITATION 30 PERCENT. .SATURDAY NIGHT...MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS. LOWS 35 TO 40. EAST WINDS 11 TO 16 MPH WITH GUSTS TO AROUND 25 MPH. CHANCE OF SHOWERS 40 PERCENT. .SUNDAY...MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS. HIGHS 45 TO 50. EAST WINDS 16 TO 21 MPH WITH GUSTS TO AROUND 31 MPH. CHANCE OF SHOWERS 40 PERCENT.
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