South Dakota Fire Weather Zone 256

...FIRE WEATHER WATCH FOR WIND AND LOW RELATIVE HUMIDITY FOR THE
LOWER BRULE...JAMES RIVER VALLEY...AND EXTREME NORTHEAST NEBRASKA FOR THURSDAY AFTERNOON... .DISCUSSION... STRONG SOUTH WINDS OF 20 TO 35 MPH ARE EXPECTED TODAY...WITH OCCASIONAL GUSTS TO 45 MPH...ESPECIALLY IN THE LATE MORNING THROUGH MID AFTERNOON. THESE STRONG WINDS WILL CREATE VERY HIGH FIRE DANGER THROUGHOUT THE REGION...DESPITE AFTERNOON HUMIDITY LEVELS RANGING FROM THE 30 TO 35 PERCENT IN THE LOWER BRULE AREA...TO HIGHER THAN 50 PERCENT ACROSS PARTS OF SOUTHWEST MINNESOTA AND NORTHWEST IOWA. SPOTTY LIGHT RAIN SHOWERS EARLY THIS MORNING SHOULD HAVE LITTLE EFFECT ON THE DRYNESS OF ONE HOUR FUELS GIVEN THE STRONG WINDS. MORE WIDESPREAD RAINFALL IS EXPECTED TONIGHT...ESPECIALLY FROM THE LOWER MISSOURI AND BIG SIOUX RIVER VALLEYS...THROUGH NORTHWEST IOWA AND PARTS OF SOUTHWEST MINNESOTA. AFTER THIS PRECIPITATION DEPARTS EARLY THURSDAY...CONCERNS OVER POTENTIAL FOR CRITICAL FIRE WEATHER ACROSS PORTIONS OF THE AREA INCREASE AGAIN FOR THURSDAY AFTERNOON. STRONG MIXING WITHIN DRYING AIR MASS BEHIND DEPARTING LOW PRESSURE SYSTEM EARLY THURSDAY IS EXPECTED TO YIELD GUSTY WEST WINDS IN THE 25 TO 35 MPH RANGE... ALONG WITH VERY LOW HUMIDITY LEVELS OF 15 TO 20 PERCENT FROM THE LOWER BRULE REGION...THROUGH THE JAMES RIVER VALLEY...AND INTO EXTREME NORTHEAST NEBRASKA. GIVEN THE CONSISTENCY WHICH HAS BEEN SEEN THE PAST FEW DAYS INDICATING THIS EXPECTED PATTERN...HAVE ISSUED A FIRE WEATHER WATCH FOR FIRE ZONES 255...256 AND 258 IN SOUTH DAKOTA...AS WELL AS NEBRASKA FIRE ZONE 249...WHERE OVERNIGHT RAINFALL IS EXPECTED TO BE MUCH LESS THAN AREAS FARTHER EAST. MIDDLE JAMES RIVER VALLEY- 611 AM CDT WED APR 23 2014 ...WIND ADVISORY IN EFFECT FROM 10 AM THIS MORNING TO 4 PM CDT THIS AFTERNOON... ...FIRE WEATHER WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH THURSDAY EVENING... .TODAY... SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN SHOWERS AND ISOLATED THUNDERSTORMS UNTIL 1300. CHANCE OF SHOWERS AND THUNDERSTORMS AFTER 1300. CHANCE OF PRECIPITATION 50 PERCENT. MAX TEMPERATURE.....66-71. MIN HUMIDITY........40-45 PERCENT. 20-FOOT WINDS.......BREEZY. SOUTHEAST WINDS 23 TO 28 MPH WITH GUSTS TO AROUND 41 MPH. HAINES INDEX........4 OR LOW. HOURS OF SUN........4 HOURS. PRECIPITATION.......SCATTERED TRACE TO 0.05 INCH AMOUNTS. MIXING HEIGHT.......AROUND 4300 FT AGL (AVE 12-6 PM). TRANSPORT WINDS.....SOUTH AROUND 31 MPH (AVE 12-6 PM). SMOKE DISPERSAL.....AROUND 111000 OR EXCELLENT (AVE 12-6 PM). MAX GFDI INDEX......VERY HIGH. REF EVAPO TRANSP....0.26 TO 0.35 INCHES (20 INCH PLANT CANOPY). .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS AND ISOLATED THUNDERSTORMS UNTIL 0100...THEN SLIGHT CHANCE OF RAIN SHOWERS. CHANCE OF PRECIPITATION 50 PERCENT. MIN TEMPERATURE.....40-45. MAX HUMIDITY........75-80 PERCENT. 20-FOOT WINDS.......NORTHEAST WINDS 12 TO 17 MPH SHIFTING TO THE NORTHWEST 8 TO 13 MPH AFTER MIDNIGHT. PRECIPITATION.......SCATTERED 0.05 TO 0.10 INCH AMOUNTS. .THURSDAY... SKY/WEATHER.........PARTLY CLOUDY. MAX TEMPERATURE.....63-68. MIN HUMIDITY........20-25 PERCENT. 20-FOOT WINDS.......BREEZY. NORTHWEST WINDS 20 TO 25 MPH WITH GUSTS TO AROUND 36 MPH. HAINES INDEX........6 OR HIGH. HOURS OF SUN........10 HOURS. PRECIPITATION.......NONE. MIXING HEIGHT.......AROUND 11200 FT AGL (AVE 12-6 PM). TRANSPORT WINDS.....WEST AROUND 31 MPH (AVE 12-6 PM). SMOKE DISPERSAL.....AROUND 298000 OR EXCELLENT (AVE 12-6 PM). MAX GFDI INDEX......VERY HIGH TO EXTREME. REF EVAPO TRANSP....0.33 TO 0.41 INCHES (20 INCH PLANT CANOPY). .FORECAST DAYS 3 THROUGH 7... .THURSDAY NIGHT...PARTLY CLOUDY. LOWS 35 TO 40. WEST WINDS 15 TO 20 MPH WITH GUSTS TO AROUND 29 MPH. .FRIDAY...PARTLY CLOUDY. HIGHS 65 TO 70. NORTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO AROUND 23 MPH. .FRIDAY NIGHT...PARTLY CLOUDY. LOWS 40 TO 45. NORTHEAST WINDS 7 TO 12 MPH. .SATURDAY...PARTLY SUNNY. SLIGHT CHANCE OF RAIN SHOWERS. HIGHS 60 TO 65. EAST WINDS 15 TO 20 MPH WITH GUSTS TO AROUND 30 MPH. CHANCE OF SHOWERS 20 PERCENT. .SATURDAY NIGHT...MOSTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS 40 TO 45. EAST WINDS 17 TO 22 MPH WITH GUSTS TO AROUND 33 MPH. CHANCE OF PRECIPITATION 50 PERCENT. .SUNDAY...RAIN SHOWERS LIKELY AND CHANCE OF THUNDERSTORMS. HIGHS 55 TO 60. EAST WINDS 18 TO 23 MPH WITH GUSTS TO AROUND 34 MPH. CHANCE OF PRECIPITATION 70 PERCENT. .SUNDAY NIGHT...RAIN SHOWERS LIKELY AND CHANCE OF THUNDERSTORMS. LOWS 40 TO 45. EAST WINDS 17 TO 22 MPH WITH GUSTS TO AROUND 33 MPH. CHANCE OF PRECIPITATION 70 PERCENT. .MONDAY...MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS. HIGHS 50 TO 55. NORTHEAST WINDS 12 TO 17 MPH WITH GUSTS TO AROUND 27 MPH. CHANCE OF SHOWERS 40 PERCENT. .MONDAY NIGHT...MOSTLY CLOUDY. CHANCE OF RAIN. LOWS 35 TO 40. NORTH WINDS 12 TO 17 MPH WITH GUSTS TO AROUND 27 MPH. CHANCE OF RAIN 40 PERCENT. .TUESDAY...MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN. HIGHS 45 TO 50. NORTH WINDS 15 TO 20 MPH WITH GUSTS TO AROUND 30 MPH. CHANCE OF RAIN 20 PERCENT.
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