Alert archive / Pennsylvania / Flash Flood Watches in 2009

Flash Flood Watch 2, NWS Philadelphia/Mount Holly

June 11, 2009Morris County, Sussex County, Warren County, New Jersey; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood watch at Jun 11, 2009, 3:15 PM EDT for Morris County, Sussex County, Warren County, New Jersey; 5 counties in Pennsylvania. It took effect at Jun 11, 2009, 8:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Jun 11, 2009, 3:15 PM EDT (19:15 UTC)
In effect from
Jun 11, 2009, 8:00 PM EDT
Expired
Jun 12, 2009, 4:10 AM EDT
In force
8 hr
Issued by
NWS Philadelphia/Mount Holly
Flood severity
None

Counties Morris County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 122 km from the middle of the area, began a volume at 19:19 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.3 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 2009-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 2009-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
729 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
134 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
WGUS61 KPHI 111915
FFAPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
FLOOD WATCH
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
315 PM EDT THU JUN 11 2009

...FLASH FLOOD WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY MORNING...

NJZ001-007-008-PAZ054-055-060>062-120900-
/O.NEW.KPHI.FF.A.0002.090612T0000Z-090612T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX-WARREN-MORRIS-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN...
JIM THORPE...STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...
EASTON
315 PM EDT THU JUN 11 2009

...FLASH FLOOD WATCH IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH
FRIDAY MORNING...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A

* FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN NEW JERSEY AND 
  PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN NEW 
  JERSEY...MORRIS...SUSSEX AND WARREN. IN PENNSYLVANIA...BERKS...
  CARBON...LEHIGH...MONROE AND NORTHAMPTON.

* FROM 8 PM EDT THIS EVENING THROUGH FRIDAY MORNING

* THE FIRST PART OF JUNE HAS BEEN VERY WET AND MORE RAIN IS ON THE
  WAY TONIGHT, AND SOME OF IT COULD BE HEAVY AT TIMES. IN
  ADDITION, A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR AREAS
  ACROSS THE SOUTHERN PENNSYLVANIA BORDER AND SOME OF THE
  THUNDERSTORMS COULD REACH INTO THE FLASH FLOOD WATCH AREA
  TONIGHT, ADDING TO THE POTENTIAL THREAT.

* RAINFALL AMOUNTS WILL RANGE BETWEEN ONE AND TWO INCHES, WITH AS
  MUCH AS THREE INCHES FALLING IN SOME ISOLATED AREAS. THE HEAVIEST
  RAIN WILL BE AFTER MIDNIGHT UNTIL 6 AM BEFORE TAPERING OFF BY
  MID MORNING FRIDAY.

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.

&&

$$

EBERWINE/MEOLA
2 follow-up statements
000 
WGUS61 KPHI 120156
FFAPHI

FLOOD WATCH
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
956 PM EDT THU JUN 11 2009

...FLASH FLOOD WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY
MORNING...

NJZ001-007-008-PAZ054-055-060>062-121000-
/O.CON.KPHI.FF.A.0002.000000T0000Z-090612T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX-WARREN-MORRIS-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN...
JIM THORPE...STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...
EASTON
956 PM EDT THU JUN 11 2009

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 AM EDT FRIDAY...

THE FLASH FLOOD WATCH CONTINUES FOR

* PORTIONS OF NORTHERN NEW JERSEY AND PENNSYLVANIA...INCLUDING 
 THE FOLLOWING AREAS...IN NORTHERN NEW JERSEY...MORRIS...SUSSEX 
 AND WARREN. IN PENNSYLVANIA...BERKS...CARBON...LEHIGH...MONROE 
 AND NORTHAMPTON.

* UNTIL 9 AM EDT FRIDAY

* THE FIRST PART OF JUNE HAS BEEN VERY WET AND MORE RAIN IS ON THE
  WAY TONIGHT... AND SOME OF IT COULD BE HEAVY AT TIMES. SHOWERS
  AND THUNDERSTORMS WILL BE MOVING OVER THE WATCH AREA TONIGHT AND
  SOME OF THE RAIN WILL BE HEAVY AT TIMES.  

* RAINFALL AMOUNTS WILL RANGE BETWEEN ONE AND TWO INCHES... WITH 
 AS MUCH AS THREE INCHES FALLING IN SOME ISOLATED AREAS. THE 
 HEAVIEST RAIN WILL BE AFTER MIDNIGHT UNTIL 6 AM BEFORE 
 TAPERING OFF BY MID MORNING FRIDAY. 

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.

&&

$$

EBERWINE/COLETTI
000 
WGUS61 KPHI 120810
FFAPHI

FLOOD WATCH
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
410 AM EDT FRI JUN 12 2009

NJZ001-007-008-PAZ054-055-060>062-120915-
/O.CAN.KPHI.FF.A.0002.000000T0000Z-090612T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX-WARREN-MORRIS-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-
INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN...
JIM THORPE...STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...
EASTON
410 AM EDT FRI JUN 12 2009

...FLASH FLOOD WATCH IS CANCELLED...

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

THE THREAT FOR WIDESPREAD HEAVY RAIN HAS ENDED, THEREFORE THE
FLASH FLOOD WATCH HAS BEEN CANCELLED.

$$

GORSE

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 11, 4:10 PM EDTCoastal Flood StatementPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more12 hr

Nearby

Flash Flood Watches in Pennsylvania, 2009Flash Flood Watches in New Jersey, 2009Every flash flood watch 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.