Public Information Statement
Issued by NWS Upton, NY

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NOUS41 KOKX 190904
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CTZ005>012-NJZ002-004-006-103>108-NYZ067>075-078>081-176>179-201000-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
600 AM EDT WED MAR 19 2014

...THIS WEEK IS NATIONAL FLOOD SAFETY AWARENESS WEEK...

TODAYS TOPIC IS FLOODING AND RELATED PHENOMENA.

WHEN IT COMES TO TROPICAL CYCLONES...WIND SPEEDS DO NOT TELL THE
WHOLE STORY. INTENSE RAINFALL...NOT DIRECTLY RELATED TO THE WIND
SPEED OF A TROPICAL CYCLONE...OFTEN CAUSES MORE DAMAGE. SINCE THE
1970S...INLAND FLOODING HAS BEEN RESPONSIBLE FOR MORE THAN HALF OF
THE DEATHS ASSOCIATED WITH TROPICAL CYCLONES IN THE UNITED STATES.
TYPICALLY...GREATER RAINFALL AMOUNTS AND FLOODING ARE ASSOCIATED
WITH TROPICAL CYCLONES THAT HAVE A SLOW FORWARD SPEED OR STALL OVER
AN AREA.

ON AUGUST 28TH 2011...HURRICANE IRENE MOVED UP ALONG THE EASTERN
SEABOARD...MAKING LANDFALL SUNDAY MORNING IN NEW YORK CITY AND
SLIGHTLY WEAKENING TO A STRONG TROPICAL STORM. THIS RESULTED IN
COPIOUS AMOUNTS OF RAIN THROUGHOUT THE AREA...WHERE TOTALS RANGED
MOSTLY FROM 3 TO 9 INCHES WITH SOME LOCALLY HIGHER AMOUNTS BETWEEN 9
AND 12 INCHES. AUTOMATED SURFACE OBSERVING SYSTEM STATIONS AT
CENTRAL PARK...LA GUARDIA AIRPORT...JFK AIRPORT...AND NEWARK AIRPORT
HAD SIGNIFICANT CONTRIBUTIONS FROM IRENE...AND ENDED UP SETTING
RECORDS FOR THE WETTEST AUGUST ON RECORD. THERE WERE NUMEROUS
FLOODING REPORTS ACROSS THE REGION INVOLVING ROADWAY CLOSURES AS
WELL AS STRANDED VEHICLES AND WATER RESCUES. THE SADDLE RIVER AT
LODI NJ REACHED ITS SECOND HIGHEST HISTORICAL CREST ON RECORD WITH A
STAGE LEVEL OF 13.50 FEET ON THIS DATE...FALLING SHORT OF THE 13.94
FEET STAGE SET ON SEPTEMBER 16TH 1999 WITH TROPICAL STORM FLOYD. THE
RAMAPO RIVER AT MAHWAH NJ SET ITS HIGHEST STAGE ON RECORD WITH A
LEVEL OF 15.78 FEET WHICH EXCEEDED ITS PREVIOUS RECORD BY MORE THAN
3 FEET. THE RARITAN RIVER AT BOUND BROOK NJ REACHED UP TO 41.90
FEET...WHICH WAS THE 2ND HIGHEST HISTORICAL STAGE ON
RECORD...FALLING JUST SHORT OF ITS STAGE DURING TROPICAL STORM FLOYD
IN SEPTEMBER 1999.

THE NEW YORK NATIONAL WEATHER SERVICE OFFICE WORKS HARD TO MONITOR
AND TRACK TROPICAL CYCLONES AND PROJECT THEIR IMPACT ON OUR REGION
TO HELP OUR RESIDENTS PREPARE. WE HOLD DAILY CONFERENCE CALLS WITH
EMERGENCY MANAGEMENT OFFICIALS...STATE AND LOCAL GOVERNMENT AGENCIES
INCLUDING THOSE WHO WORK IN DISASTER RELIEF. WE ALSO HAVE THE
HURRICANE HOTLINE IN OUR OFFICE...WHICH IS A DIRECT LINE TO THE
NATIONAL HURRICANE CENTERS FORECASTERS. WE ALSO WORK CLOSELY WITH
OUR RIVER FORECAST CENTERS WHO MODEL THE RIVER AND STREAM FLOW IN
OUR REGION...WHICH IS CRITICAL FOR FLOOD FORECASTING.

FALL AND SPRING NOREASTERS ALSO HAVE THE POTENTIAL TO PRODUCE
DAMAGING FRESHWATER FLOODING FROM HEAVY RAINFALL. AN INTENSE...SLOW
MOVING NOREASTER ON APRIL 15-16...2007 BROUGHT RECORD-SETTING
RAINFALL AMOUNTS BETWEEN 4 AND 9.5 INCHES TO NEW YORK
CITY...SOUTHWESTERN CONNECTICUT...NORTHEASTERN NEW JERSEY...AND THE
LOWER HUDSON VALLEY. SERIOUS FLOODING OCCURRED IN PORTIONS OF
NORTHEASTERN NEW JERSEY AND WESTCHESTER COUNTY NEW YORK.

DURING WINTER...LARGE SNOW STORMS AND COLD WEATHER LEAVE MANY
LOCATIONS ACROSS THE LOCAL AREA WITH A DEEP SNOW COVER AND FROZEN
RIVERS. IF HEAVY RAIN AND UNUSUALLY MILD TEMPERATURES MOVE INTO A
LOCATION WITH A DEEP SNOW COVER AND FROZEN RIVER...ICE BREAKS UP.
THESE ICE JAMS...WHICH FLOAT DOWNSTREAM...OFTEN PILE UP NEAR NARROW
PASSAGES...SUCH AS BRIDGES...CAUSING WATER TO OVERFLOW UPSTREAM FROM
THE JAM...RESULTING IN FLOODING OF NEARBY HOMES AND BUSINESSES.

AN ICE JAM FLOOD CAN OCCUR QUICKLY. THE RISK OF ICE JAM FLOODING
INCREASES WHEN THE AMOUNT OF ICE IN OUR AREA WATER SYSTEMS IS ABOVE
NORMAL. AN ICE JAM RESTRICTS THE NATURAL FLOW OF A WATER SYSTEM. TO
HELP THE PUBLIC PREPARE FOR THE POTENTIAL OF WINTER AND SPRING
FLOODING...THE NEW YORK NATIONAL WEATHER SERVICE OFFICE ISSUES
SPRING FLOOD POTENTIAL OUTLOOKS EVERY OTHER THURSDAY WHICH DETAILS
CURRENT SNOWPACK...ICE AND SOIL MOISTURE. THE OUTLOOK DETERMINES THE
RISK FOR WINTER AND SPRING FLOODING. THIS OUTLOOK CAN BE FOUND ON
THE NEW YORK NATIONAL WEATHER SERVICE OFFICE WEB SITE...WHICH IS
WEATHER.GOV/OKX.

ONCE THE SMOKE CLEARS FROM A WILDFIRE...THE DANGER IS NOT OVER.
FLASH FLOODS AND DEBRIS FLOWS...OR MUDFLOWS...CAN BE ONE OF THE MOST
HAZARDOUS CONSEQUENCES OF RAINFALL ON BURNED HILL SLOPES. JUST A
SMALL AMOUNT OF RAINFALL ON A BURNED AREA CAN LEAD TO THESE HAZARDS.
THE POWERFUL FORCE OF RUSHING WATER...SOIL AND ROCK...BOTH WITHIN
THE BURNED AREA AND DOWNSTREAM...CAN DESTROY
CULVERTS...BRIDGES...ROADWAYS...AND OTHER STRUCTURES...AND CAN
RESULT IN INJURY OR DEATH. THE U.S. GEOLOGICAL LANDSLIDES HAZARDS
PROGRAM IN PARTNERSHIP WITH THE NATIONAL OCEANIC AND ATMOSPHERIC
ADMINISTRATION STRIVES TO REDUCE LOSS OF LIFE AND PROPERTY TO
LANDSLIDE HAZARDS THROUGH IMPROVED UNDERSTANDING AND EFFECTIVE
MITIGATION. THIS IS ACCOMPLISHED IN THREE PRIMARY WAYS...DEVELOPMENT
OF IMPROVED APPROACHES FOR LANDSLIDE HAZARD
ASSESSMENTS...POST-DISASTER RESPONSE...AND PUBLIC INFORMATION AND
OUTREACH.

THE TOPICS THAT WE WILL FOCUS ON THE REST OF THIS WEEK ARE...
THURSDAY...FLOOD INSURANCE.
FRIDAY...FLOOD SAFETY.


FOR MORE INFORMATION ON FLOOD AWARENESS WEEK USE THIS WEB SITE...

HTTP://WWW.FLOODSAFETY.NOAA.GOV

IF YOU NEED ADDITIONAL INFORMATION...CONTACT GARY CONTE AT
GARY.CONTE@NOAA.GOV OR NANCY FURBUSH AT NANCY.FURBUSH@NOAA.GOV.

$$






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