Public Information Statement
Issued by NWS Cheyenne, WY

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WYZ101>119-250400-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
923 AM MDT FRI APR 24 2015

...THIS IS SEVERE WEATHER AWARENESS WEEK IN WYOMING...

THE WEEK OF APRIL 20 TO APRIL 24 HAS BEEN DESIGNATED SEVERE WEATHER
AWARENESS WEEK IN WYOMING. TODAY WE WILL DISCUSS FIRE WEATHER.

WHAT IS FIRE WEATHER AND WHY WOULD IT BE INCLUDED IN SEVERE WEATHER
AWARENESS WEEK?

FIRE WEATHER IS A BROAD TERM USED TO DESCRIBE WEATHER VARIABLES
THAT INFLUENCE FIRE POTENTIAL...BEHAVIOR...AND SUPPRESSION. THE
NATIONAL WEATHER SERVICE ISSUES WATCHES AND WARNINGS WHEN WEATHER
VARIABLES ENCOURAGE EXTREME FIRE BEHAVIOR...JUST LIKE THE NATIONAL
WEATHER SERVICE DOES FOR EXTREME WINTER WEATHER CONDITIONS OR FOR
SEVERE THUNDERSTORMS.

THERE ARE TWO PRODUCTS ISSUED TO WARN OF EXTREME FIRE BEHAVIOR. THE
FIRST IS A FIRE WEATHER WATCH WHICH IS ISSUED WHEN THE WEATHER IS
EXPECTED TO ENCOURAGE EXTREME FIRE BEHAVIOR A COUPLE OF DAYS FROM
NOW...AND IT IS OFTEN UPGRADED TO WHAT IS KNOWN AS A RED FLAG
WARNING ONCE THE TIME OF THE ANTICIPATED CONDITIONS DRAWS CLOSER.

WHEN IS A RED FLAG WARNING ISSUED?

THE MAIN TWO WEATHER ELEMENTS THAT ENCOURAGE EXPLOSIVE FIRE GROWTH
IS VERY LOW RELATIVE HUMIDITY AND BREEZY WINDS. HUMIDITY BELOW 15
PERCENT IN COMBINATION WITH GUSTY WINDS ABOVE 25 MPH...HAVE SHOWN
TO RESULT IN EXPLOSIVE FIRE GROWTH WHEN FUELS ARE CRITICAL. IF
THESE CONDITIONS ARE EXPECTED THEN A RED FLAG WARNING IS ISSUED
WITHIN 24 HOURS OF THE EVENT.

A RED FLAG WARNING WILL ALSO BE ISSUED WHEN THUNDERSTORMS WITH
LITTLE OR NO RAINFALL ARE EXPECTED WHEN FUELS ARE CRITICAL. DRY
THUNDERSTORMS CAN INITIATE MULTIPLE NEW FIRE STARTS...WHICH CAN
TAX FIRE FIGHTING RESOURCES.

IF A RED FLAG WARNING IS ISSUED FOR YOUR AREA...THIS IS YOUR SIGNAL
TO BE EVEN MORE CAUTIOUS WITH FIRE.

WILDFIRES CAN BE STARTED BY THE SLIGHTEST SPARK...EVEN FROM
SOMETHING AS PERCEPTIVELY HARMLESS AS PARKING AN ATV IN THE
GRASS...THE WARM MUFFLER MAY START A GRASS FIRE.

CHECK FOR CURRENT BURN BANS FOR YOUR COUNTY...AND PLEASE TAKE
THEM SERIOUSLY. IF YOU PLAN ON DOING SOME AGRICULTURAL BURNING...
PLEASE NOTIFY YOUR LOCAL SHERIFF AND FIRE DEPARTMENT TO ENSURE THAT
IT IS LEGAL AND THAT YOU DO NOT CAUSE ANY FALSE ALARM CALLS.

ALSO PLEASE CALL THE NATIONAL WEATHER SERVICE AT 800-269-6220 FOR A
FORECAST FIRST SO THAT YOU ENSURE THAT RED FLAG CONDITIONS WILL NOT
DEVELOP AND CAUSE YOUR FIRE TO BECOME UNCONTROLLABLE.

$$


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