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Heavy Rain and Flooding April 29 - May 1 Observation Thread


IsentropicLift

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FLOOD ADVISORY
NATIONAL WEATHER SERVICE NEW YORK NY
1024 AM EDT WED APR 30 2014

CTC001-009-NYC071-079-087-119-301630-
/O.NEW.KOKX.FA.Y.0010.140430T1424Z-140430T1630Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
1024 AM EDT WED APR 30 2014

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED AN

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR MINOR FLOODING OF POOR
  DRAINAGE AREAS IN...
  ORANGE COUNTY IN SOUTHEAST NEW YORK...
  PUTNAM COUNTY IN SOUTHEAST NEW YORK...
  ROCKLAND COUNTY IN SOUTHEAST NEW YORK...
  NORTHERN WESTCHESTER COUNTY IN SOUTHEAST NEW YORK...
  NORTHWESTERN NEW HAVEN COUNTY IN SOUTHERN CONNECTICUT...
  FAIRFIELD COUNTY IN SOUTHERN CONNECTICUT...

* UNTIL 1230 PM EDT...

* AT 1023 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
HEAVY RAIN ACROSS THE REGION...CONCENTRATED IN ORANGE COUNTY. THIS
IS MOVING TO THE NORTHEAST. MORE MODERATE TO POSSIBLY HEAVY RAIN IS
EXPECTED BEFORE 1230 PM. THIS WILL CAUSE MINOR FLOODING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MINOR FLOODING MEANS THAT ALTHOUGH STREAMS AND CREEKS MAY RISE OUT OF
THEIR BANKS...PROPERTY DAMAGE WILL BE MINIMAL. INCONVENIENCES CAN BE
EXPECTED BUT THE FLOODING WILL NOT BE IMMEDIATELY LIFE THREATENING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. MOST FLOODING DEATHS OCCUR IN AUTOMOBILES. TURN AROUND AND
FIND ANOTHER ROUTE.

SMALL CREEKS AND STREAMS WILL FLOOD QUICKLY...POSSIBLY COVERING ROADS
AND FLOODING NEARBY LOW AREAS.

BE PREPARED TO TAKE ACTION IF THE FLOODING THREAT INCREASES...OR A
WARNING IS ISSUED.


 

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FLOOD ADVISORY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1008 AM EDT WED APR 30 2014

DEC001-005-NJC001-005-007-009-011-015-025-029-301715-
/O.NEW.KPHI.FA.Y.0257.140430T1408Z-140430T1715Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAMDEN NJ-GLOUCESTER NJ-KENT DE-SUSSEX DE-BURLINGTON NJ-CAPE MAY NJ-
MONMOUTH NJ-ATLANTIC NJ-OCEAN NJ-CUMBERLAND NJ-
1008 AM EDT WED APR 30 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED AN

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR...
  SOUTHEASTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHEASTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  EASTERN KENT COUNTY IN CENTRAL DELAWARE...
  EASTERN SUSSEX COUNTY IN SOUTHERN DELAWARE...
  BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  CAPE MAY COUNTY IN SOUTHERN NEW JERSEY...
  MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...
  OCEAN COUNTY IN SOUTHERN NEW JERSEY...
  CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 115 PM EDT

* AT 1008 AM EDT AN INCH TO AN INCH AND A HALF OF RAIN HAS FALLEN
ACROSS THE AREA SO FAR THIS MORNING. AN AREA OF MODERATE TO HEAVY
RAINFALL WILL MOVE ACROSS THE AREA DURING THE NEXT SEVERAL HOURS AND
COULD PRODUCE ANOTHER INCH OF RAINFALL THROUGH THE MORNING HOURS
WITH ADDITIONAL RAINFALL CONTINUING INTO THE AFTERNOON.

EXCESSIVE RUNOFF ASSOCIATED WITH THIS RAINFALL WILL CAUSE MINOR
FLOODING OF HIGHWAYS, STREETS, AND OTHER POOR DRAINAGE AREAS AND LOW
LYING SPOTS. UNDERPASSES PRONE TO FLOODING COULD ALSO BE AFFECTED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
 

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FLOOD ADVISORY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1106 AM EDT WED APR 30 2014

NJC019-021-023-027-035-037-041-PAC017-025-077-089-095-301800-
/O.NEW.KPHI.FA.Y.0258.140430T1506Z-140430T1800Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WARREN NJ-HUNTERDON NJ-MERCER NJ-MORRIS NJ-SOMERSET NJ-SUSSEX NJ-
BUCKS PA-LEHIGH PA-MONROE PA-CARBON PA-NORTHAMPTON PA-MIDDLESEX NJ-
1106 AM EDT WED APR 30 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED AN

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR...
  WARREN COUNTY IN NORTHWEST NEW JERSEY...
  HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  MORRIS COUNTY IN NORTHERN NEW JERSEY...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  SUSSEX COUNTY IN NORTHWEST NEW JERSEY...
  BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...

* UNTIL 200 PM EDT

* AT 1102 AM EDT AN INCH TO AN INCH AND A HALF OF RAIN HAS FALLEN
ACROSS THE AREA SO FAR THIS MORNING. AN AREA OF MODERATE TO HEAVY
RAINFALL WILL MOVE ACROSS THE AREA DURING THE NEXT SEVERAL HOURS AND
COULD PRODUCE ANOTHER INCH OF RAINFALL THROUGH THE MORNING HOURS
WITH ADDITIONAL RAINFALL CONTINUING INTO THE AFTERNOON.

EXCESSIVE RUNOFF ASSOCIATED WITH THIS RAINFALL WILL CAUSE MINOR
FLOODING OF HIGHWAYS, STREETS, AND OTHER POOR DRAINAGE AREAS AND LOW
LYING SPOTS. UNDERPASSES PRONE TO FLOODING COULD ALSO BE AFFECTED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
&&
 

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First flash flood warning to our southwest

 

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
108 PM EDT WED APR 30 2014

MDC027-031-302000-
/O.CON.KLWX.FF.W.0001.000000T0000Z-140430T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONTGOMERY MD-HOWARD MD-
108 PM EDT WED APR 30 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM EDT FOR
HOWARD AND MONTGOMERY COUNTIES...

AT 1259 PM EDT...EMERGENCY MANAGEMENT REPORTED WATER RESCUES IN THE
CENTRAL PART OF THE COUNTY. THE STREAM GAUGE ON TURKEY BRANCH NEAR
ROCKVILLE ROSE FIVE FEET IN FIFTEEN MINUTES AND WAS CONTINUING TO
RISE. THIS IS A DANGEROUS SITUATION. ADDITIONAL RAINFALL AMOUNTS OF
UP TO 1 INCH CAN BE EXPECTED AS MORE RAIN MOVES INTO THE AREA FROM
THE SOUTH.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ASPEN HILL...
BOYDS...COLESVILLE...COLUMBIA...DAMASCUS...ELLICOTT CITY...
FAIRLAND...GAITHERSBURG...GERMANTOWN...MONTGOMERY VILLAGE...NORTH
POTOMAC...OLNEY...POTOMAC...ROCKVILLE AND WHITE OAK.

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR
VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. FLOODWATER USUALLY IS
DEEPER THAN IT APPEARS. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. MAKE THE SMART CHOICE WHEN
FLOODED ROADS ARE ENCOUNTERED...TURN AROUND...DONT DROWN.

 

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FLOOD ADVISORY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
120 PM EDT WED APR 30 2014

NJC005-007-011-015-025-029-033-302115-
/O.NEW.KPHI.FA.Y.0260.140430T1720Z-140430T2115Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAMDEN NJ-GLOUCESTER NJ-BURLINGTON NJ-MONMOUTH NJ-OCEAN NJ-SALEM NJ-
CUMBERLAND NJ-
120 PM EDT WED APR 30 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED AN

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR...
  CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  NORTHWESTERN OCEAN COUNTY IN SOUTHERN NEW JERSEY...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 515 PM EDT

* AT 118 PM EDT...RAINFALL, IN EXCESS OF ONE AND ONE HALF INCHES,
HAS FALLEN THUS FAR ACROSS PORTIONS OF THE ADVISED AREA. AN
ADDITIONAL ONE TO TWO INCHES CAN BE EXPECTED THIS AFTERNOON AND INTO
THIS EVENING.

EXCESSIVE RUNOFF ASSOCIATED WITH THIS RAINFALL WILL CAUSE MINOR
FLOODING OF HIGHWAYS, STREETS, AND OTHER POOR DRAINAGE AREAS AND LOW
LYING SPOTS. UNDERPASSES PRONE TO FLOODING COULD ALSO BE AFFECTED.
CREEKS AND STREAMS WILL ALSO SEE RISES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

 

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Rainfall totals already over 1" in the NYC area. We'll easily see over 2":

 

NYC 1.11"

LGA 1.07"

JFK 1.08"

EWR 1.43"

I doubt anyone here seriously thought anyone would see under 2" in this area. Going to go out on a limb here and say none of the major airports record under 3" of rain total. The heaviest amounts are still to come tonight where the RAP is indicating an additional 3"+ in spots.

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Doppler radar is estimating a large swath of 0.25"+ per hour rates with embedded 0.50"+ per hour rates propagating towards the area from the SW. The 16z RAP has that moving through with a brief break around 10PM before the finale which looks to end around sometime around 5-6AM on that model.

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This has to be additional rain forecasted right? No reason to lower totals this much. I know it says from 8AM this morning, Doesn't make sense since it was just issued.

 

StormTotalQPFFcst.png

It's from 8am this morning to the end. So take the amount you had at 8am and add that much to it. That still brings a lot of people close to 4".

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