South Dakota Fire Weather Zone 257

...RED FLAG WARNING IN EFFECT FROM 1 PM TO 7 PM CDT TODAY FOR
VERY STRONG NORTHWEST WINDS AND LOW HUMIDITY FOR LOWER BRULE... JAMES VALLEY...AND MISSOURI VALLEY AREAS INTO ADJACENT PORTIONS OF NORTHWEST IOWA... ...FIRE WEATHER WATCH REMAINS IN EFFECT THIS AFTERNOON AND EARLY EVENING FOR EAST CENTRAL SOUTH DAKOTA...SOUTHWEST MINNESOTA...AND NORTHERN AND EASTERN PORTIONS OF NORTHWEST IOWA FOR VERY STRONG NORTHWEST WINDS AND MODERATELY LOW HUMIDITY... .DISCUSSION... ISSUED AT 433 AM CDT SUN MAR 29 2015 NOT QUITE AS STRAIGHTFORWARD ISSUES WITH FIRE WEATHER TODAY. SOME OF THE STRONGEST WINDS MAY ACTUALLY OCCUR DURING THE LATER MORNING AS AREA OF LOWER CLOUDS MOVES THROUGH...AND HUMIDITY LIKELY TO GET A BIT OF A BOOST WITH SECONDARY AREA OF VERY LIGHT RAIN SLIDING THROUGH EAST CENTRAL SOUTH DAKOTA AND SOUTHWEST MINNESOTA MID TO LATE MORNING. ANY CLOUDS AND PRECIP WILL COME TO A QUICK DEMISE BY LATE MORNING...LEAVING SUN AND WIND TO WORK ON THE REST OF THE DAY. DECIDED TO GO WITH THE RED FLAG WARNING IN THOSE AREAS WHERE LOWEST HUMIDITY GETS CLOSE TO OR EXCEEDS 20/25 PERCENT CRITERIA...WITH STRONG WINDS THE DECIDING FACTOR ON PUSHING MARGINAL CONDITIONS... DESPITE THE FACT THAT LOWEST HUMIDITY AND STRONGEST WINDS WILL BE SOMEWHAT OFF TIMED IN THE LOWER BRULE AREAS. ELSEWHERE...AFTER COORDINATION CALL HAVE MAINTAINED FIRE WEATHER WATCH FOR EAST CENTRAL SOUTH DAKOTA...SOUTHWEST MINNESOTA AND IOWA GREAT LAKES AREA IN NORTHWEST IOWA. LOWEST HUMIDITY IS MUCH MORE HIGHLY IN QUESTION IN THESE AREAS...CURRENTLY EXPECTED TO REMAIN 30 TO 38 PERCENT. ALSO HAVE WILD CARD OF MORNING RAINFALL MOVING THROUGH THE NORTHERN AND EASTERN FIRE WEATHER ZONES. ALBEIT EXPECTATIONS OF VERY LIGHT PRECIPITATION...SHOULD BE SUFFICIENT WITH WIND AND SUBSIDENCE TO ALTER FINE FUELS FAST ENOUGH TO MATTER. EXTREME FIRE DANGER TODAY FOR ALL AREAS. WESTERLY FLOW ON MONDAY SHOULD FAVOR STRONG MIXING...RESULTING IN AFTERNOON WIND GUSTS TO AROUND 25 MPH OR SLIGHTLY HIGHER...ALONG WITH MINIMUM HUMIDITY LEVELS FROM 20 TO 25 PERCENT OVER MUCH OF THE THE AREA. FIRE DANGER WILL BE VERY HIGH THROUGHOUT THE AREA...BUT COULD APPROACH EXTREME IF WINDS BECOME SLIGHTLY STRONGER THAN FORECAST. STRONG PRE- AND POST-FRONTAL WINDS ON WEDNESDAY WILL LEAD TO VERY HIGH FIRE DANGER AT SOME POINT DURING THE DAY FOR ALL LOCATIONS. HOWEVER THE FIRE DANGER SHOULD DECREASE ACROSS NORTHWEST IOWA DURING THE AFTERNOON AS THE FRONT MOVES IN...BRINGING A DECREASE IN WINDS AND INCREASE IN PRECIP THREAT. DEEP NORTHWEST FLOW WILL DOMINATE ACROSS THE AREA THURSDAY...WHICH SHOULD AGAIN BE FAVORABLE FOR MIXING DOWN SOME HIGHER WIND GUSTS AND LOWER DEW POINTS IN THE AFTERNOON. THIS WILL LEAD TO ANOTHER DAY OF VERY HIGH FIRE DANGER FOR MOST AREAS. MIDDLE BIG SIOUX RIVER VALLEY- 518 AM CDT SUN MAR 29 2015 ...WIND ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... ...FIRE WEATHER WATCH IN EFFECT FROM 1 PM CDT THIS AFTERNOON THROUGH THIS EVENING... .TODAY... SKY/WEATHER.........PARTLY CLOUDY. CHANCE OF RAIN SHOWERS UNTIL 1300. CHANCE OF SHOWERS 50 PERCENT. MAX TEMPERATURE.....52-57. MIN HUMIDITY........30-35 PERCENT. 20-FOOT WINDS.......WINDY. NORTHWEST WINDS 27 TO 32 MPH WITH GUSTS TO AROUND 48 MPH. HAINES INDEX........4 OR LOW. HOURS OF SUN........9 HOURS. PRECIPITATION.......ISOLATED TRACE TO 0.05 INCH AMOUNTS. MIXING HEIGHT.......AROUND 4500 FT AGL (AVE 12-6 PM). TRANSPORT WINDS.....NORTHWEST AROUND 31 MPH (AVE 12-6 PM). SMOKE DISPERSAL.....AROUND 117000 OR EXCELLENT (AVE 12-6 PM). MAX GFDI INDEX......EXTREME. REF EVAPO TRANSP....0.20 TO 0.28 INCHES (20 INCH PLANT CANOPY). .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY. MIN TEMPERATURE.....32-37. MAX HUMIDITY........65-70 PERCENT. 20-FOOT WINDS.......WEST WINDS 13 TO 18 MPH WITH GUSTS TO AROUND 27 MPH SHIFTING TO THE SOUTHWEST 5 TO 7 MPH AFTER MIDNIGHT. PRECIPITATION.......NONE. .MONDAY... SKY/WEATHER.........PARTLY CLOUDY. MAX TEMPERATURE.....68-73. MIN HUMIDITY........24-28 PERCENT. 20-FOOT WINDS.......WEST WINDS 14 TO 19 MPH WITH GUSTS TO AROUND 29 MPH. HAINES INDEX........6 OR HIGH. HOURS OF SUN........7 HOURS. PRECIPITATION.......NONE. MIXING HEIGHT.......AROUND 6800 FT AGL (AVE 12-6 PM). TRANSPORT WINDS.....WEST AROUND 25 MPH (AVE 12-6 PM). SMOKE DISPERSAL.....AROUND 146000 OR EXCELLENT (AVE 12-6 PM). MAX GFDI INDEX......VERY HIGH. REF EVAPO TRANSP....0.25 TO 0.30 INCHES (20 INCH PLANT CANOPY). .FORECAST DAYS 3 THROUGH 7... .MONDAY NIGHT...MOSTLY CLEAR. LOWS 35 TO 40. NORTHWEST WINDS 8 TO 13 MPH. .TUESDAY...MOSTLY SUNNY. HIGHS 65 TO 70. SOUTH WINDS 5 TO 10 MPH. .TUESDAY NIGHT...WARMER. PARTLY CLOUDY. LOWS 50 TO 55. SOUTH WINDS 15 TO 20 MPH WITH GUSTS TO AROUND 29 MPH. .WEDNESDAY...PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. HIGHS 70 TO 75. SOUTHWEST WINDS 17 TO 22 MPH WITH GUSTS TO AROUND 31 MPH. CHANCE OF PRECIPITATION 20 PERCENT. .WEDNESDAY NIGHT...COLDER. PARTLY CLOUDY. LOWS 35 TO 40. NORTHWEST WINDS 13 TO 18 MPH WITH GUSTS TO AROUND 28 MPH. .THURSDAY...COOLER. PARTLY CLOUDY. HIGHS 55 TO 60. NORTHWEST WINDS 15 TO 20 MPH WITH GUSTS TO AROUND 30 MPH. .THURSDAY NIGHT...MOSTLY CLOUDY. LOWS 30 TO 35. NORTH WINDS 10 TO 15 MPH WITH GUSTS TO AROUND 24 MPH. .FRIDAY...PARTLY CLOUDY. HIGHS 45 TO 50. NORTH WINDS 8 TO 13 MPH WITH GUSTS TO AROUND 22 MPH. .FRIDAY NIGHT...PARTLY CLOUDY. LOWS 30 TO 35. WEST WINDS 6 TO 11 MPH. .SATURDAY...PARTLY CLOUDY. HIGHS 55 TO 60. WEST WINDS 8 TO 13 MPH WITH GUSTS TO AROUND 22 MPH.
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