Red Flag Warning-what does that mean

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URGENT – FIRE WEATHER MESSAGE

NATIONAL WEATHER SERVICE QUAD CITIES IA IL
708 AM CDT WED APR 9 2014
 ...CRITICAL FIRE WEATHER CONDITIONS THIS AFTERNOON AND EARLY THIS
EVENING...
 .RED FLAG CONDITIONS ARE EXPECTED MAINLY THIS AFTERNOON AND EARLY
THIS EVENING. WINDY WITH LOW RELATIVE HUMIDITY...COMBINED WITH DRY
GRASSES AND WARM TEMPERATURES...WILL ALLOW ANY FIRES THAT DEVELOP
TO SPREAD RAPIDLY. AVOID OUTDOOR BURNING TODAY.
BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-
CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-
HENRY IA-DES MOINES-VAN BUREN-LEE-ROCK ISLAND-SCOTLAND-CLARK-
708 AM CDT WED APR 9 2014

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 7 PM CDT
THIS EVENING FOR WIND AND LOW HUMIDITY FOR LOCATIONS ALONG AND
WEST OF THE MISSISSIPPI RIVER.

* AFFECTED AREA...COUNTIES IN ILLINOIS...ROCK ISLAND. COUNTIES IN
  IOWA...BUCHANAN...DELAWARE...DUBUQUE...BENTON...LINN...JONES...JACKSON...
  IOWA...JOHNSON...CEDAR...CLINTON...MUSCATINE...SCOTT...KEOKUK...WASHINGTON
  ...LOUISA...JEFFERSON...HENRY...DES MOINES...VAN BUREN...LEE.
  COUNTIES IN MISSOURI...SCOTLAND...CLARK.

* TIMING...NOON TO 7 PM TODAY.

* WINDS...SOUTHWEST AT 15 TO 25 MPH WITH GUSTS TO 35 MPH.

* RELATIVE HUMIDITY...AS LOW AS 23 TO 25 PERCENT THIS AFTERNOON.

* TEMPERATURES...IN THE LOWER 70S.

* GFDI...VERY HIGH TO NEAR EXTREME CATEGORY.

* IMPACTS...UNDER THESE CONDITIONS...FIRES CAN EASILY AND VERY
  QUICKLY GET OUT OF CONTROL AND SPREAD RAPIDLY. OUTDOOR BURNING
  IS NOT RECOMMENDED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF
STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES CAN
CONTRIBUTE TO EXTREME AND EXPLOSIVE FIRE GROWTH BEHAVIOUR.