Alert archive / Pennsylvania / Flash Flood Warnings in 2009

Flash Flood Warning 21, NWS Philadelphia/Mount Holly

July 31, 2009Carbon County, Monroe County, Pennsylvania; Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 31, 2009, 2:13 PM EDT for Carbon County, Monroe County, Pennsylvania; Sussex County, New Jersey. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 31, 2009, 2:13 PM EDT (18:13 UTC)
Expired
Jul 31, 2009, 5:52 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Sussex County, NJ, Carbon County, PA, Monroe County, PA

The radar

The Binghamton radar (KBGM), 138 km from the middle of the area, began a volume at 18:15 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.2 hours before the alert went out and 198 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, Brookhaven, NY at 12:00Z on 2009-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 48 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, Brookhaven, NY at 12:00Z on 2009-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 133 square meters per square second.193958Sfc1 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
48 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
1022 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
133 m²/s²
0-3 km storm-relative helicity
184 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 311813
FFWPHI
NJC037-PAC025-089-312215-
/O.NEW.KPHI.FF.W.0021.090731T1813Z-090731T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
213 PM EDT FRI JUL 31 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...
  MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF MOUNT POCONO...
  NORTHERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 615 PM EDT

* AT 205 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  AN AREA OF EXCESSIVE RAINFALL APPROACHING THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  STORMVILLE...TOBYHANNA...SKYTOP...SCOTRUN...REEDERS...POCONO
  RACEWAY...PARADISE VALLEY...MECKESVILLE...LONG POND...LAKE
  HARMONY...JONAS...HERNYVILLE...ECHO LAKE...CHRISTMANS...
  CANADENSIS...BLAKESLEE...ANALOMINK...ALPINE MOUNTAIN...
  ALBRIGHTSVILLE...HIGH POINT...HAINESVILLE...FLATBROOKVILLE...POCONO
  PINES...MOUNTAINHOME...EAST STROUDSBURG...DELAWARE WATER GAP AND
  CRANDON LAKES

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.  
DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN 
DEPTH BY FOOT OR BY AUTOMOBILE.

&&

LAT...LON 4126 7451 4108 7497 4086 7531 4082 7544
      4074 7579 4090 7599 4098 7584 4100 7575
      4103 7576 4125 7532 4126 7514 4116 7516
      4115 7509 4109 7501 4115 7491 4127 7484
      4134 7475 4135 7468

$$

KRUZDLO
2 follow-up statements
000 
WGUS71 KPHI 312025
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
425 PM EDT FRI JUL 31 2009

NJC037-PAC025-089-312215-
/O.CON.KPHI.FF.W.0021.000000T0000Z-090731T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX NJ-CARBON PA-MONROE PA-
425 PM EDT FRI JUL 31 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM EDT FOR
MONROE...CARBON AND NORTHWESTERN SUSSEX COUNTIES...

AT 425 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED MORE 
HEAVY RAIN MOVING INTO THE WARNED AREA. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HERNYVILLE...
TOBYHANNA...SKYTOP...PARADISE VALLEY...CANADENSIS...ALPINE
MOUNTAIN...HIGH POINT...HAINESVILLE...FLATBROOKVILLE...POCONO
PINES...MOUNTAINHOME AND MOUNT POCONO

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

&&

LAT...LON 4126 7451 4108 7497 4086 7531 4082 7544
      4074 7579 4090 7599 4098 7584 4100 7575
      4103 7576 4125 7532 4126 7514 4116 7516
      4115 7509 4109 7501 4115 7491 4127 7484
      4134 7475 4135 7468

$$

KRUZDLO
000 
WGUS71 KPHI 312152
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
552 PM EDT FRI JUL 31 2009

NJC037-PAC025-089-312203-
/O.CAN.KPHI.FF.W.0021.000000T0000Z-090731T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX NJ-CARBON PA-MONROE PA-
552 PM EDT FRI JUL 31 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR MONROE...CARBON AND
NORTHWESTERN SUSSEX COUNTIES...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

LAT...LON 4126 7451 4108 7497 4086 7531 4082 7544
      4074 7579 4090 7599 4098 7584 4100 7575
      4103 7576 4125 7532 4126 7514 4116 7516
      4115 7509 4109 7501 4115 7491 4127 7484
      4134 7475 4135 7468

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 3:04 PM EDTFlash Flood WarningPHIBucks, Chester, Montgomery3 hr
Jul 31, 3:36 PM EDTSevere Thunderstorm WarningPHIChester, Delaware54 min
Jul 31, 3:40 PM EDTSevere Thunderstorm WarningPHIChester65 min
Jul 31, 4:03 PM EDTSevere Thunderstorm WarningPHIChester, Delaware57 min
Jul 31, 4:08 PM EDTFlash Flood WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia3 hr
Jul 31, 4:31 PM EDTSevere Thunderstorm WarningPHIBucks, Delaware, Montgomery, Philadelphia59 min
Jul 31, 2:36 PM EDTFlash Flood WarningPHIHunterdon, Morris, Sussex, Warren4 hr
Jul 31, 4:23 PM EDTSpecial Marine WarningPHI67 min
Jul 31, 4:39 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more96 min
Jul 31, 4:56 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset114 min
Jul 31, 5:07 PM EDTFlash Flood WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Salem3 hr
Jul 31, 5:10 PM EDTTornado WarningPHIBurlington, Ocean21 min
Jul 31, 5:14 PM EDTSpecial Marine WarningPHI2 hr
Jul 31, 5:15 PM EDTSevere Thunderstorm WarningPHIAtlantic, Ocean60 min
Jul 31, 5:16 PM EDTSpecial Marine WarningPHI119 min
Jul 31, 5:31 PM EDTFlash Flood WarningPHIBurlington, Monmouth, Ocean4 hr
Jul 31, 5:48 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Cumberland, Ocean3 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2009Flash Flood Warnings in New Jersey, 2009Every flash flood warning in 2009

Sources

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