Public Information Statement
Issued by NWS Riverton, WY

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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
500 AM MDT FRI APR 22 2016

...THIS IS 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. CURRENT FIRE BANS CAN BE FOUND AT THE FOLLOWING WEB PAGE:
WWW.WY.BLM.GOV/WY_FIRE_RESTRICTIONS

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.


BILL MURRELL
METEOROLOGIST
NATIONAL WEATHER SERVICE
RIVERTON WY
WEATHER.GOV/RIVERTON

$$



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