Red Flag Warning 22, NWS Sioux Falls, SD

Issued

Sep 21, 2012, 12:57 PM CDT (17:57 UTC)

In effect from

Sep 21, 2012, 3:00 PM CDT

Expired

Sep 21, 2012, 7:00 PM CDT

In force

4 hr

Issued by

NWS Sioux Falls, SD

490 
WWUS83 KFSD 211757
RFWFSD

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1257 PM CDT FRI SEP 21 2012

...RED FLAG WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 7 PM
THIS EVENING IN THE JAMES RIVER VALLEY...THE BIG SIOUX RIVER
VALLEY...AND EXTREME NORTHEAST NEBRASKA...FOR LOW HUMIDITY AND
GUSTY NORTHWEST WINDS. 

.IN THE WARNED AREAS...HUMIDITY VALUES WILL BOTTOM OUT THIS
AFTERNOON IN THE 20 TO 23 PERCENT RANGE...COUPLED WITH NORTHWEST
WINDS SUSTAINED AT 15 TO 20 MPH...BUT WITH FREQUENT GUSTS AROUND
30 MPH. 

TO THE WEST...SOUTH DAKOTA FIRE WEATHER ZONE 255 WHICH INCLUDES
THE CHAMBERLAIN...LAKE ANDES...AND GREGORY COUNTY AREAS...WILL
ALSO BE VERY CLOSE TO RED FLAG CONDITIONS. IT APPEARS THAT THE
HUMIDITY THRESHOLD WILL BE A BIT ABOVE RED FLAG CRITERIA IN THAT
AREA BUT FIRE CONDITIONS WILL STILL BE VERY POOR.

IAZ300-NEZ249-SDZ256>258-220000-
/O.NEW.KFSD.FW.W.0022.120921T2000Z-120922T0000Z/
NORTHERN LOESS HILLS AND FLOYD RIVER BASIN-
EXTREME NORTHEAST NEBRASKA-MIDDLE JAMES RIVER VALLEY-
MIDDLE BIG SIOUX RIVER VALLEY-
LOWER JAMES RIVER TO LOWER BIG SIOUX RIVER VALLEY-
1257 PM CDT FRI SEP 21 2012

...RED FLAG WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR
WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 249...256...
257...258 AND 300...

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A RED FLAG
WARNING FOR WIND AND LOW RELATIVE HUMIDITY...WHICH IS IN EFFECT
UNTIL 7 PM CDT THIS EVENING.

* AFFECTED AREA...IN IOWA...FIRE WEATHER ZONE 300. IN
  NEBRASKA...FIRE WEATHER ZONE 249. IN SOUTH DAKOTA...FIRE WEATHER
  ZONES 256...257 AND 258. THESE AREAS INCLUDE IN SOUTHEAST AND
  EAST CENTRAL SOUTH DAKOTA...THE JAMES RIVER VALLEY...THE BIG
  SIOUX RIVER VALLEY. ALSO EXTREME NORTHEAST NEBRASKA AND AREAS
  NEAR SIOUX CITY TO ORANGE CITY IOWA ARE INCLUDED.

* WINDS...NORTHWEST 17 TO 22 MPH WITH GUSTS AROUND 30 MPH.

* RELATIVE HUMIDITY...AS LOW AS 20 PERCENT.

* IMPACTS...WITH THE EXTREMELY DRY VEGETATION...ANY FIRE THAT
  WOULD START IN THESE WEATHER CONDITIONS WILL SPREAD VERY RAPIDLY
  AND EXHIBIT CRITICAL FIRE BEHAVIOR. FIRE IGNITION POTENTIAL IS ALSO
  HIGH.

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
WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

&&

$$

587 
WWUS83 KFSD 220012
RFWFSD

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SIOUX FALLS SD
712 PM CDT FRI SEP 21 2012

...DIMINISHING WINDS DECREASING CRITICAL FIRE WEATHER CONDITIONS...

IAZ300-NEZ249-SDZ256>258-220115-
/O.EXP.KFSD.FW.W.0022.000000T0000Z-120922T0000Z/
NORTHERN LOESS HILLS AND FLOYD RIVER BASIN-
EXTREME NORTHEAST NEBRASKA-MIDDLE JAMES RIVER VALLEY-
MIDDLE BIG SIOUX RIVER VALLEY-
LOWER JAMES RIVER TO LOWER BIG SIOUX RIVER VALLEY-
712 PM CDT FRI SEP 21 2012

...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE
HUMIDITY FOR FIRE WEATHER ZONES 249...256...257...258 AND 300...

WIND SPEEDS HAVE BEGUN TO DROP OFF THIS EVENING. WHILE GUSTY WINDS
ARE EXPECTED AT TIMES OVERNIGHT...INCREASING RELATIVE HUMIDITY LEVELS
WILL ALLOW CRITICAL FIRE WEATHER CONDITIONS TO DIMINISH THROUGH THE
EVENING.

$$

Red Flag Warnings in South Dakota, 2012Red Flag Warnings in Nebraska, 2012Red Flag Warnings in Iowa, 2012Every red flag warning in 2012

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.