Alert archive / New Jersey / Flash Flood Watches in 2012

Flash Flood Watch 2, NWS Philadelphia/Mount Holly

June 1, 20127 counties in Pennsylvania; 11 counties in New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood watch at Jun 1, 2012, 4:15 PM EDT for 7 counties in Pennsylvania; 11 counties in New Jersey; New Castle County, Delaware. It took effect at Jun 1, 2012, 10:00 PM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Jun 1, 2012, 4:15 PM EDT (20:15 UTC)
In effect from
Jun 1, 2012, 10:00 PM EDT
Expired
Jun 2, 2012, 3:31 AM EDT
In force
6 hr
Issued by
NWS Philadelphia/Mount Holly
Flood severity
None

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Carbon County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 74 km from the middle of the area, began a volume at 20:15 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, 8.3 hours before the alert went out and 191 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 2012-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2012-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1177 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

731 
WGUS61 KPHI 012015
FFAPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
FLOOD WATCH
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
415 PM EDT FRI JUN 1 2012

DEZ001-NJZ001-007>010-012>015-017>019-PAZ054-055-060>062-067>071-
020415-
/O.NEW.KPHI.FF.A.0002.120602T0200Z-120602T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE-SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-
WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA-
INCLUDING THE CITIES OF...WILMINGTON...NEWTON...WASHINGTON...
MORRISTOWN...FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...FREEHOLD...
SANDY HOOK...TRENTON...GLASSBORO...CAMDEN...CHERRY HILL...
MOORESTOWN...MOUNT HOLLY...JIM THORPE...STROUDSBURG...READING...
ALLENTOWN...BETHLEHEM...EASTON...WEST CHESTER...NORRISTOWN...
DOYLESTOWN...MEDIA...PHILADELPHIA
415 PM EDT FRI JUN 1 2012

...FLASH FLOOD WATCH IN EFFECT FROM 10 PM EDT THIS EVENING
THROUGH SATURDAY MORNING...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A

* FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE...NEW 
  JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN 
  NORTHERN DELAWARE...NEW CASTLE. IN NEW JERSEY...CAMDEN... 
  EASTERN MONMOUTH...GLOUCESTER...HUNTERDON...MERCER... 
  MIDDLESEX...MORRIS...NORTHWESTERN BURLINGTON...SOMERSET... 
  SUSSEX...WARREN AND WESTERN MONMOUTH. IN PENNSYLVANIA... 
  BERKS...BUCKS...CARBON...CHESTER...DELAWARE...LEHIGH... 
  MONROE...MONTGOMERY...NORTHAMPTON AND PHILADELPHIA. 

* FROM 10 PM EDT THIS EVENING THROUGH SATURDAY MORNING

* A COLD FRONT WILL CROSS THE REGION TONIGHT AND EARLY SATURDAY
  MORNING AND WILL PRODUCE WIDESPREAD SHOWERS AND THUNDERSTORMS.
  RAINFALL AMOUNTS BETWEEN 1.00 AND 1.50 INCHES WILL BE COMMON.
  GREATER AMOUNTS, UP TO 2.50 INCHES, WILL BE POSSIBLE IN THE
  STRONGER STORMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD
TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION.

YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION
SHOULD FLASH FLOOD WARNINGS BE ISSUED.

&&

$$

KRUZDLO
1 follow-up statement
410 
WGUS61 KPHI 020731
FFAPHI

FLOOD WATCH
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
331 AM EDT SAT JUN 2 2012

DEZ001-NJZ001-007>010-012>015-017>019-PAZ054-055-060>062-067>071-
020845-
/O.CAN.KPHI.FF.A.0002.000000T0000Z-120602T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE-SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-
WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA-
INCLUDING THE CITIES OF...WILMINGTON...NEWTON...WASHINGTON...
MORRISTOWN...FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...FREEHOLD...
SANDY HOOK...TRENTON...GLASSBORO...CAMDEN...CHERRY HILL...
MOORESTOWN...MOUNT HOLLY...JIM THORPE...STROUDSBURG...READING...
ALLENTOWN...BETHLEHEM...EASTON...WEST CHESTER...NORRISTOWN...
DOYLESTOWN...MEDIA...PHILADELPHIA
331 AM EDT SAT JUN 2 2012

...FLASH FLOOD WATCH IS CANCELLED...

THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE...NEW
JERSEY AND PENNSYLVANIA HAS BEEN CANCELLED.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 6:20 AM EDTCoastal Flood AdvisoryPHIDelaware, Philadelphia24 hr
Jun 1, 5:31 PM EDTSpecial Weather StatementPHIBerks59 min
Jun 1, 6:17 PM EDTSevere Thunderstorm WarningPHIChester44 min
Jun 1, 6:58 PM EDTAreal Flood AdvisoryPHIBerks6 hr

Nearby

Flash Flood Watches in New Jersey, 2012Flash Flood Watches in Pennsylvania, 2012Flash Flood Watches in Delaware, 2012Every flash flood watch in 2012

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.