Red Flag Warning
Issued by NWS Sioux Falls, SD

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000
WWUS83 KFSD 240900
RFWFSD

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SIOUX FALLS SD
400 AM CDT THU APR 24 2014

...RED FLAG WARNING IN EFFECT THIS AFTERNOON FOR LOWER BRULE
AREAS...THE JAMES VALLEY...LOWER BIG SIOUX VALLEY...AND EXTREME
NORTHEAST NEBRASKA FOR A COMBINATION OF STRONG WINDS... VERY DRY
FINE FUELS...AND VERY LOW HUMIDITY...

.A VERY DRY AIR MASS WILL FILTER INTO THE AREA ONCE AGAIN BEHIND
DEPARTING LOW PRESSURE. BY LATE THIS MORNING...CONDITIONS WILL
QUICKLY DEGRADE IN THE RED FLAG WARNING AREA WITH NORTHWEST WINDS
INCREASING TO 20 TO 35 MPH...AND HUMIDITY PLUNGING TO 15 TO 20
PERCENT BY EARLY AFTERNOON.

AREAS RIGHT ALONG INTERSTATE 29 FROM BROOKINGS SOUTH DAKOTA TO
SIOUX CITY IOWA ARE EXPECTED TO HAVE WINDS BELOW RED FLAG WARNING
CRITERIA...BUT THESE AREAS WILL ALSO SEE HUMIDITY VALUES FALLING
TO NEAR 20 TO 25 PERCENT BY MID AFTERNOON. HEADING EAST OF I
29...HUMIDITY VALUES SHOULD BE HIGHER AND WINDS LIGHTER.

NEZ249-SDZ255-256-258-241700-
/O.CON.KFSD.FW.W.0004.140424T1800Z-140425T0000Z/
EXTREME NORTHEAST NEBRASKA-LOWER BRULE AND LAKE ANDES VICINITY-
MIDDLE JAMES RIVER VALLEY-
LOWER JAMES RIVER TO LOWER BIG SIOUX RIVER VALLEY-
400 AM CDT THU APR 24 2014

...RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
7 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE
WEATHER ZONES 249...255...256 AND 258...

* AFFECTED AREA...IN EXTREME NORTHEAST NEBRASKA...FIRE WEATHER
  ZONE 249. IN SOUTH DAKOTA...FIRE WEATHER ZONES 255...256 AND
  258. THESE ZONES ENCOMPASS THE LOWER BRULE AREA...AND THE
  MIDDLE AND LOWER JAMES RIVER VALLEY.

* WINDS...NORTHWEST 20 TO 25 MPH WITH GUSTS UP TO 35 MPH.

* RELATIVE HUMIDITY...AS LOW AS 15 PERCENT.

* IMPACTS...THE POTENTIAL EXISTS FOR FAST MOVING AND INTENSE
  GRASSLAND FIRES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING NOW...OR IN THE NEAR FUTURE. A COMBINATION
OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES
CAN CONTRIBUTE TO EXTREME FIRE BEHAVIOR.

&&

$$




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