Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS Philadelphia/Mount Holly

May 19, 2011Bucks County, Monroe County, Northampton County, Pennsylvania; Hunterdon County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at May 19, 2011, 4:39 PM EDT for Bucks County, Monroe County, Northampton County, Pennsylvania; Hunterdon County, Warren County, New Jersey. It was in force for 4 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 19, 2011, 4:39 PM EDT (20:39 UTC)
Expired
May 19, 2011, 8:47 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 115 km from the middle of the area, began a volume at 20:42 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
May 19, 5:02 PM EDTFLASH FLOODPlainfield Twp, PAPA 115 CLOSED DUE TO FLOODING
May 19, 5:20 PM EDTFLASH FLOODStroud Twp, PAWIDESPREAD ROADWAY FLOODING ALONG AND AROUND U.S. 209 AND PA 33.
May 19, 5:54 PM EDTFLASH FLOODWashington Twp, PABRIDGE WASHED OUT DUE TO FLOODING AT CEDAR RD AND RICHMOND RD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.7 hours before the alert went out and 167 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2011-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 143 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2011-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
143 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
819 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
53 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

204 
WGUS51 KPHI 192039
FFWPHI
NJC019-041-PAC017-089-095-200245-
/O.NEW.KPHI.FF.W.0003.110519T2039Z-110520T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
439 PM EDT THU MAY 19 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF EASTON...
  SOUTH CENTRAL MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  NORTHWESTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  WESTERN WARREN COUNTY IN NORTHWEST NEW JERSEY...
  NORTH CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 1045 PM EDT

* AT 431 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  OVER AN INCH OF RAIN HAS FALLEN WITHIN THE LAST HOUR WITH 
  ADDITIONAL RAINFALL MOVING INTO THE AREA CAPABLE OF PRODUCING 
  ADDITIONAL ONE TO TWO INCHES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NAZARETH...
  TATAMY...STORMVILLE...SAYLORSBURG...ROXBURG...PLEASANT VALLEY...
  HOPE...HARMONY...COLUMBIA...WIND GAP...PEN ARGYL...EAST BANGOR...
  DELAWARE WATER GAP...BELFAST...BANGOR...WASHINGTON...OXFORD...BRASS
  CASTLE...BLAIRSTOWN AND BELVIDERE

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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4098 7536 4100 7495 4051 7490 4051 7533

$$

ROBERTSON
2 follow-up statements
239 
WGUS71 KPHI 192146
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
546 PM EDT THU MAY 19 2011

NJC019-041-PAC017-089-095-200245-
/O.CON.KPHI.FF.W.0003.000000T0000Z-110520T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WARREN NJ-HUNTERDON NJ-NORTHAMPTON PA-BUCKS PA-MONROE PA-
546 PM EDT THU MAY 19 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT FOR
SOUTH CENTRAL MONROE...NORTH CENTRAL BUCKS...EASTERN NORTHAMPTON...
NORTHWESTERN HUNTERDON AND WESTERN WARREN COUNTIES...

AT 527 PM EDT...TRAINED WEATHER SPOTTERS REPORTED ROADWAY FLOODING 
IN STROUD TOWNSHIP NEAR THE INTERSECTION OF US ROUTE 209 AND 
PENNSYLVANIA ROUTE 33.

ONE TO THREE INCHES OF RAINFALL HAS FALLEN ACROSS THE AREA THIS 
AFTERNOON. ADDITIONAL SHOWERS AND THUNDERSTORMS ARE CAPABLE OF 
PRODUCING ANOTHER INCH OF RAIN THIS EVENING WHICH WILL LIKELY LEAD 
TO MORE FLOODING ACROSS THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PLEASANT
VALLEY...STORMVILLE...SAYLORSBURG...ROXBURG...HOPE...COLUMBIA...WIND
GAP...PEN ARGYL...EAST BANGOR...DELAWARE WATER GAP...BELFAST...
BANGOR...WASHINGTON...OXFORD...BRASS CASTLE...BLAIRSTOWN AND
BELVIDERE

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
THURSDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4098 7536 4100 7495 4051 7490 4051 7533

$$

ROBERTSON
816 
WGUS71 KPHI 200047
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
847 PM EDT THU MAY 19 2011

NJC019-041-PAC017-089-095-200055-
/O.CAN.KPHI.FF.W.0003.000000T0000Z-110520T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WARREN NJ-HUNTERDON NJ-NORTHAMPTON PA-BUCKS PA-MONROE PA-
847 PM EDT THU MAY 19 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTH CENTRAL
MONROE...NORTH CENTRAL BUCKS...EASTERN NORTHAMPTON...NORTHWESTERN
HUNTERDON AND WESTERN WARREN COUNTIES...

THE HEAVY RAINFALL THAT PROMPTED THE WARNING HAS ENDED ACROSS THE 
AREA AND ANY REMAINING HIGH WATER SHOULD CONTINUE TO RECEDE THIS 
EVENING. ADDITIONAL SHOWERS AND ISOLATED THUNDERSTORMS ARE POSSIBLE 
THIS EVENING AND OVERNIGHT.

LAT...LON 4098 7536 4100 7495 4051 7490 4051 7533

$$

ROBERTSON

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 19, 12:31 PM EDTSpecial Weather StatementPHIBerks89 min
May 19, 1:26 PM EDTAreal Flood AdvisoryPHIBerks5 hr
May 19, 1:29 PM EDTSevere Thunderstorm WarningPHIBerks61 min
May 19, 2:22 PM EDTSevere Thunderstorm WarningPHIBerks41 min
May 19, 2:54 PM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Northampton3 hr
May 19, 3:00 PM EDTSpecial Weather StatementPHICarbon60 min
May 19, 3:01 PM EDTAreal Flood AdvisoryPHIChester, Delaware, Montgomery, Philadelphia3 hr
May 19, 3:05 PM EDTSpecial Weather StatementPHILehigh, Northampton55 min
May 19, 3:12 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Monroe, Northampton63 min
May 19, 3:15 PM EDTSpecial Weather StatementPHIChester, Delaware, Montgomery, Philadelphia60 min
May 19, 3:37 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton53 min
May 19, 3:40 PM EDTAreal Flood AdvisoryPHIBucks, Lehigh, Monroe, Northampton5 hr
May 19, 3:52 PM EDTCoastal Flood StatementPHIDelaware, Philadelphia8 hr
May 19, 4:06 PM EDTSevere Thunderstorm WarningPHIPhiladelphia54 min
May 19, 4:18 PM EDTSpecial Weather StatementPHIMonroe57 min
May 19, 4:20 PM EDTSevere Thunderstorm WarningPHIBucks, Northampton55 min
May 19, 4:28 PM EDTSpecial Weather StatementPHIBucks62 min
May 19, 4:31 PM EDTSpecial Weather StatementPHIBucks59 min
May 19, 4:50 PM EDTSpecial Weather StatementPHIMonroe55 min
May 19, 5:08 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton50 min
May 19, 7:23 PM EDTAreal Flood WarningPHIMontgomery, Philadelphia82 min
May 19, 7:50 PM EDTSpecial Weather StatementPHIPhiladelphia55 min
May 18, 8:29 PM EDTAreal Flood WarningPHIMorris4 days
May 19, 3:35 AM EDTRiver Flood WarningPHIEssex, Morris, Passaic4 days
May 19, 10:26 AM EDTRiver Flood WarningPHIEssex, Passaic65 hr
May 19, 10:28 AM EDTRiver Flood WarningPHIPassaic11 hr
May 19, 2:19 PM EDTSpecial Weather StatementPHICamden, Cumberland, Gloucester, Salem56 min
May 19, 2:34 PM EDTSpecial Weather StatementPHIWarren56 min
May 19, 3:23 PM EDTSpecial Weather StatementPHIHunterdon67 min
May 19, 3:34 PM EDTSmall Craft Advisory for Hazardous SeasPHI12 hr
May 19, 4:02 PM EDTSpecial Weather StatementPHICamden, Gloucester58 min
May 19, 5:21 PM EDTSpecial Weather StatementPHIBurlington54 min
May 19, 5:43 PM EDTSpecial Marine WarningPHI62 min
May 19, 5:58 PM EDTSpecial Weather StatementPHISussex47 min
May 19, 6:08 PM EDTSpecial Weather StatementPHICumberland, Salem52 min
May 19, 7:34 PM EDTSevere Thunderstorm WarningPHIAtlantic, Camden, Cumberland, Gloucester56 min

Nearby

Flash Flood Warnings in Pennsylvania, 2011Flash Flood Warnings in New Jersey, 2011Every flash flood warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.