Public Information Statement
Issued by NWS Buffalo, NY

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NOUS41 KBUF 181157
PNSBUF
NYZ001>008-010>014-019>021-085-190000-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
830 AM EDT WED MAR 18 2015

MARCH 15 THROUGH MARCH 22 IS FLOOD SAFETY WEEK IN THE UNITED STATES.
THE NATIONAL WEATHER SERVICE IN BUFFALO WILL FEATURE INFORMATION
ABOUT A DIFFERENT FLOOD TOPIC EACH DAY DURING THE AWARENESS WEEK.

TODAY`S TOPIC: FLOODS HAZARDS

A FLOOD IS DEFINED AS ANY HIGH FLOW...OVERFLOW...OR INUNDATION OF
WATER THAT CAUSES OR THREATENS DAMAGE. FLOODING CAN OCCUR WITH
PROLONGED RAINFALL OVER SEVERAL DAYS...INTENSE RAINFALL OVER A SHORT
PERIOD OF TIME...OR WHEN WATER FROM AN EXISTING SOURCE MOVES TOO
QUICKLY (I.E. SNOWMELT...DAM BREAK...ETC.). BRIEF DESCRIPTIONS OF
THE VARIOUS TYPES OF FLOODING YOU MAY EXPERIENCE ARE FOUND BELOW.

FLASH FLOODING: FLASH FLOODING IS A RAPID AND EXTREME FLOW OF HIGH
WATER INTO A NORMALLY DRY AREA...OR A RAPID WATER LEVEL RISE IN A
STREAM OR CREEK ABOVE A PREDETERMINED FLOOD LEVEL...BEGINNING WITHIN
SIX HOURS OF THE CAUSATIVE EVENT (I.E. INTENSE RAINFALL...DAM
FAILURE...ICE JAM).

RIVER FLOODING: RIVER FLOODING OCCURS WHEN RIVERS RISE AND OVERFLOW
THEIR BANKS...INUNDATING AREAS THAT ARE NORMALLY DRY.

BURN SCARS/DEBRIS FLOWS: WILDFIRES BURN AWAY THE VEGETATION OF AN
AREA...LEAVING BEHIND BARE GROUND THAT TENDS TO REPEL WATER. WHEN
RAIN FALLS...IT RUNS OFF A BURN SCAR TOWARDS A LOW LYING
AREA...SOMETIMES CARRYING BRANCHES...SOIL AND OTHER DEBRIS ALONG
WITH IT. WITHOUT VEGETATION TO HOLD THE SOIL IN PLACE...FLOODING CAN
PRODUCE MUD AND DEBRIS FLOWS.

SNOWMELT: FLOODING DUE TO SNOWMELT MOST OFTEN OCCURS IN THE SPRING
WHEN WARMING TEMPERATURES QUICKLY MELT THE SNOW. THE WATER RUNS OFF
THE STILL PARTIALLY FROZEN OR ALREADY SATURATED GROUND INTO NEARBY
STREAMS AND RIVERS...CAUSING THEM TO RAPIDLY RISE AND SOMETIMES
OVERFLOW THEIR BANKS.

ICE AND DEBRIS JAMS: A BACKUP OF WATER INTO SURROUNDING AREAS CAN
OCCUR WHEN A RIVER OR STREAM IS BLOCKED BY A BUILD-UP OF ICE OR
OTHER DEBRIS.

DAM BREAK AND LEVEE FAILURE: A BREAK OR FAILURE CAN OCCUR WITH
LITTLE TO NO WARNING. MOST OFTEN THEY ARE CAUSED BY WATER
OVERTOPPING THE STRUCTURE...EXCESSIVE SEEPAGE THROUGH THE
SURROUNDING GROUND...OR A STRUCTURAL FAILURE.

UNDERSTANDING THE DIFFERENT FLOOD HAZARDS AND KNOWING THE ACTIONS TO
TAKE BEFORE...DURING...AND AFTERWARD CAN HELP YOU PROTECT YOUR
LIFE...THE LIVES OF YOUR LOVED ONES...AND YOUR PROPERTY. PREPARE NOW
BY VISITING WWW.FLOODSAFETY.NOAA.GOV

$$






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