Alert archive / New Jersey / Flash Flood Warnings in 2009

Flash Flood Warning 30, NWS Philadelphia/Mount Holly

August 2, 20095 counties in New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 2, 2009, 11:18 AM EDT for 5 counties in New Jersey. It was in force for 9 hr. 12 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: Aug 2, 2009, 11:18 AM EDT (15:18 UTC)
Expired: Aug 2, 2009, 8:18 PM EDT
In force: 9 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 15:07 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

Time	Report	Where	Remark
Aug 2, 12:10 PM EDT	HEAVY RAIN 0.82	Lawrenceville, NJ	0.82 INCHES IN 20 MINUTES.
Aug 2, 12:10 PM EDT	HEAVY RAIN 1	Ewing, NJ	OVER 1 INCH AND HOUR RATES.
Aug 2, 12:10 PM EDT	HEAVY RAIN 2.24	High Bridge, NJ	2.24 INCHES MEASURED IN 45 MINUTES.
Aug 2, 12:15 PM EDT	FLASH FLOOD	High Bridge, NJ	CINDER BLOCKS SWEPT AWAY FROM CONSTRUCTION SITE.
Aug 2, 12:50 PM EDT	HEAVY RAIN 1.38	3 E Edison, NJ	1.38 FELL IN 20 MINUTES.
Aug 2, 1:00 PM EDT	HEAVY RAIN 1	4 N Edinburg, NJ	OVER 1 INCH AND HOUR RATES.
Aug 2, 1:11 PM EDT	FLASH FLOOD	Bridgewater, NJ	CHAMBERS BROOK FLOODING.
Aug 2, 1:27 PM EDT	FLASH FLOOD	Parsippany-Troy Hills T, NJ	ROADS ARE UNDER AS MUCH AS 3 FEET OF WATER.
Aug 2, 1:29 PM EDT	FLASH FLOOD	Bridgewater, NJ	MANY ROADS FLOODED WITH NUMEROUS WATER RESCUES.
Aug 2, 1:30 PM EDT	HEAVY RAIN 0	3 W Califon, NJ	4.35 INCHES OF RAIN SINCE PRECIPITATION BEGAN. NUMEROUS LOCAL DRIVEWAYS AND ROADS FLOODED.
Aug 2, 1:50 PM EDT	HEAVY RAIN 0	Annandale, NJ	3.62 INCHES.
Aug 2, 3:30 PM EDT	FLASH FLOOD	4 N Somerville, NJ	MILLNOR ROAD COMPLETELY FLOODED IN BEDMINSTER.

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 3.3 hours before the alert went out and 151 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 105 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 723 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 021518
FFWPHI
NJC019-021-023-027-035-022115-
/O.NEW.KPHI.FF.W.0030.090802T1518Z-090802T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1118 AM EDT SUN AUG 2 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...PERTH AMBOY...NEW BRUNSWICK...
  MORRIS COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF MORRISTOWN...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...
  HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 515 PM EDT

* AT 1116 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A LINE OF THUNDERSTORMS WITH TORRENTIAL RAIN THAT WILL MOVE THROUGH
  THE WARNED AREA. RAINFALL AMOUNTS OF ONE TO TWO INCHES WILL BE 
  COMMON WITH RAINFALL RATES EXCEEDING FOUR INCHES PER HOUR.
 
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WHITE HOUSE
  STATION...MILLINGTON...GREEN POND...BASKING RIDGE...SUCCASUNNA...
  PEQUANNOCK TOWNSHIP...PEAPACK AND GLADSTONE...PARSIPPANY...
  MADISON...LONG VALLEY...LEBANON...LAKE TELEMARK...KINNELON...HIGH
  BRIDGE...HAMPTON...GLEN GARDNER...FAR HILLS...EAST HANOVER...
  DOVER...CLINTON...CHESTER...CALIFON...BUDD LAKE...BOONTON AND
  ANNANDALE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

&&

LAT...LON 4048 7427 4045 7422 4039 7425 4018 7460
      4013 7461 4015 7472 4040 7497 4042 7506
      4053 7507 4057 7514 4066 7508 4080 7485
      4090 7478 4091 7466 4105 7454 4097 7427
      4067 7445 4066 7440 4059 7444 4057 7420

$$

TFG

3 follow-up statements

000 
WGUS71 KPHI 022041
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
441 PM EDT SUN AUG 2 2009

NJC023-022051-
/O.CAN.KPHI.FF.W.0030.000000T0000Z-090802T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MIDDLESEX NJ-
441 PM EDT SUN AUG 2 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR MIDDLESEX COUNTY...

THE CURRENT HEAVY RAIN THREAT HAS ENDED FOR THE COUNTY.

LAT...LON 4067 7445 4066 7440 4060 7444 4056 7453
      4048 7447 4034 7465 4028 7456 4013 7461
      4017 7468 4015 7472 4040 7497 4042 7506
      4053 7507 4057 7514 4066 7508 4083 7482
      4090 7478 4092 7465 4105 7454 4097 7427

$$

NJC019-021-027-035-022115-
/O.CON.KPHI.FF.W.0030.000000T0000Z-090802T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MORRIS NJ-HUNTERDON NJ-SOMERSET NJ-MERCER NJ-
441 PM EDT SUN AUG 2 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM EDT FOR
MERCER...SOMERSET...HUNTERDON AND MORRIS COUNTIES...
 
FLOODING AND FLASH FLOODING IS ONGOING ACROSS THE REGION.
THE FLASH FLOOD WARNING WILL SHORTLY BE EXTENDED.


LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MILLINGTON...
MARTINSVILLE...GREEN POND...BRIDGEWATER...BASKING RIDGE...WHITE HOUSE
STATION...SUCCASUNNA...PEQUANNOCK TOWNSHIP...PEAPACK AND GLADSTONE...
PARSIPPANY...MORRISTOWN...MADISON...LONG VALLEY...LEBANON...LAKE
TELEMARK...KINNELON...HIGH BRIDGE...HAMPTON...GLEN GARDNER...FAR
HILLS...EAST HANOVER...DOVER...CLINTON...CHESTER...CALIFON...BUDD
LAKE...BOONTON AND ANNANDALE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

&&

LAT...LON 4067 7445 4066 7440 4060 7444 4056 7453
      4048 7447 4034 7465 4028 7456 4013 7461
      4017 7468 4015 7472 4040 7497 4042 7506
      4053 7507 4057 7514 4066 7508 4083 7482
      4090 7478 4092 7465 4105 7454 4097 7427

$$
 
TFG

000 
WGUS51 KPHI 022048
FFWPHI
NJC019-021-027-035-030315-
/O.EXT.KPHI.FF.W.0030.000000T0000Z-090803T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
448 PM EDT SUN AUG 2 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  MORRIS COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF MORRISTOWN...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...
  HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 1115 PM EDT

* FLOODING OF MANY STREAMS ARE CONTINUING IN THE WARNED AREA.
  IN ADDITION SOME ADDITIONAL SCATTERED SHOWERS AND THUNDERSTORMS
  SHOULD MOVE INTO AND THROUGH THE WARNED AREA BETWEEN 6 PM AND 9
  PM. WHILE THE HEAVY RAIN WILL NOT BE AS WIDESPREAD, THESE 
  THUNDERSTORMS COULD CAUSE ADDITIONAL OR EXACERBATE 
  ONGOING FLOODING.  

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BOUND
  BROOK...MILFORD...MILLINGTON...MARTINSVILLE...GREEN POND...
  BRIDGEWATER...BASKING RIDGE...WHITE HOUSE STATION...SUCCASUNNA...
  PEQUANNOCK TOWNSHIP...PEAPACK AND GLADSTONE...PARSIPPANY...
  MADISON...LONG VALLEY...LEBANON...LAKE TELEMARK...KINNELON...HIGH
  BRIDGE...HAMPTON...GLEN GARDNER...FAR HILLS...EAST HANOVER...
  DOVER...CLINTON...CHESTER...CALIFON...BUDD LAKE...BOONTON AND
  ANNANDALE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

FLOODING IS OCCURRING. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

&&

LAT...LON 4067 7445 4066 7440 4060 7444 4056 7453
      4048 7447 4034 7465 4028 7456 4013 7461
      4017 7468 4015 7472 4040 7497 4042 7506
      4053 7507 4057 7514 4066 7508 4083 7482
      4090 7478 4092 7465 4105 7454 4097 7427

$$
 
TFG

000 
WGUS71 KPHI 030018
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
818 PM EDT SUN AUG 2 2009

NJC019-021-027-035-030027-
/O.CAN.KPHI.FF.W.0030.000000T0000Z-090803T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MORRIS NJ-HUNTERDON NJ-SOMERSET NJ-MERCER NJ-
818 PM EDT SUN AUG 2 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR MERCER...
SOMERSET...HUNTERDON AND MORRIS COUNTIES...

STREAMS AND CREEKS IN OUR REGION CONTINUED TO RETURN WITHIN THEIR 
BANKS THIS EVENING.  AS A RESULT...THE NATIONAL WEATHER SERVICE HAS 
DISCONTINUED THE FLASH FLOOD WARNING.

LAT...LON 4067 7445 4066 7440 4060 7444 4056 7453
      4048 7447 4034 7465 4028 7456 4013 7461
      4017 7468 4015 7472 4040 7497 4042 7506
      4053 7507 4057 7514 4066 7508 4083 7482
      4090 7478 4092 7465 4105 7454 4097 7427

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 2:19 AM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more	13 hr
Aug 2, 7:34 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	3 hr
Aug 2, 8:48 AM EDT	Areal Flood Warning	PHI	Mercer	4 hr
Aug 2, 10:53 AM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	67 min
Aug 2, 11:14 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Warren	61 min
Aug 2, 11:25 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer	65 min
Aug 2, 11:30 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	60 min
Aug 2, 11:33 AM EDT	Special Marine Warning	PHI		87 min
Aug 2, 11:48 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	57 min
Aug 2, 11:51 AM EDT	Tornado Warning	PHI	Mercer	24 min
Aug 2, 12:13 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more	3 hr
Aug 2, 12:23 PM EDT	Special Marine Warning	PHI		97 min
Aug 2, 12:27 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	48 min
Aug 2, 12:45 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	60 min
Aug 2, 12:49 PM EDT	River Flood Warning	PHI	Mercer	8 hr
Aug 2, 1:28 PM EDT	Special Marine Warning	PHI		92 min
Aug 2, 1:43 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	47 min
Aug 2, 1:49 PM EDT	Special Marine Warning	PHI		86 min
Aug 2, 1:51 PM EDT	Special Marine Warning	PHI		84 min
Aug 2, 1:56 PM EDT	Special Marine Warning	PHI		2 hr
Aug 2, 1:59 PM EDT	River Flood Warning	PHI	Hunterdon, Somerset	13 hr
Aug 2, 4:16 PM EDT	River Flood Warning	PHI	Middlesex, Somerset	20 hr
Aug 2, 4:16 PM EDT	River Flood Warning	PHI	Middlesex, Somerset	22 hr

Nearby

Flash Flood Warnings in New Jersey, 2009 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.