Alert archive / New Jersey / Tornado Warnings in 2009

Tornado Warning 10, NWS Philadelphia/Mount Holly

July 31, 2009Burlington County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 31, 2009, 5:10 PM EDT for Burlington County, Ocean County, New Jersey. It was in force for 21 min. 1 report 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: Jul 31, 2009, 5:10 PM EDT (21:10 UTC)
Expired: Jul 31, 2009, 5:31 PM EDT
In force: 21 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Burlington County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 10 km from the middle of the area, began a volume at 21:11 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
Jul 31, 5:10 PM EDT	TSTM WND DMG	Medford Lakes, NJ	TREES REPORTED DOWN. ALSO, SOME SMALL HAIL.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 31, 1:18 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.2 hours before the alert went out and 176 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: 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 
WFUS51 KPHI 312110
TORPHI
NJC005-029-312145-
/O.NEW.KPHI.TO.W.0010.090731T2110Z-090731T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
510 PM EDT FRI JUL 31 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  WEST CENTRAL OCEAN COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 545 PM EDT

* AT 508 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR MEDFORD...
  OR 19 MILES EAST OF CAMDEN...MOVING EAST AT 30 MPH.

* THE TORNADO WILL BE NEAR...
  LEISURETOWNE AND TABERNACLE BY 515 PM EDT...
  PRESIDENTIAL LAKES...BROWNS MILLS AND 6 MILES NORTH OF CHATSWORTH
  BY 530 PM EDT...
  OLD HALFWAY BY 540 PM EDT...
  CEDAR GLEN LAKES...WHITING AND BAMBER LAKE BY 545 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

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 4005 7436 3983 7430 3978 7480 3991 7482
TIME...MOT...LOC 2109Z 258DEG 28KT 3987 7476

$$

AMC

1 follow-up statement

000 
WWUS51 KPHI 312131
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
531 PM EDT FRI JUL 31 2009

NJC005-029-312139-
/O.CAN.KPHI.TO.W.0010.000000T0000Z-090731T2145Z/
OCEAN NJ-BURLINGTON NJ-
531 PM EDT FRI JUL 31 2009

...THE TORNADO WARNING FOR CENTRAL BURLINGTON AND WEST CENTRAL OCEAN
COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED SOME AND NO LONGER 
APPEARS TO BE TORNADIC. HOWEVER...THE POSSIBILITY OF DAMAGE FROM 
STRAIGHT LINE WINDS CONTINUES. WIND DAMAGE WAS REPORTED IN THE 
MEDFORD LAKES AREA.

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 4005 7436 3983 7430 3978 7480 3991 7482
TIME...MOT...LOC 2129Z 258DEG 28KT 3990 7456

$$

AMC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 2:13 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Jul 31, 2:36 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Sussex, Warren	4 hr
Jul 31, 4:03 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	57 min
Jul 31, 4:08 PM EDT	Flash Flood Warning	PHI	Burlington, Camden, Gloucester, Salem	3 hr
Jul 31, 4:23 PM EDT	Special Marine Warning	PHI		67 min
Jul 31, 4:31 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Salem	59 min
Jul 31, 4:39 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	96 min
Jul 31, 4:56 PM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset	114 min
Jul 31, 5:07 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	3 hr
Jul 31, 5:14 PM EDT	Special Marine Warning	PHI		2 hr
Jul 31, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Ocean	60 min
Jul 31, 5:16 PM EDT	Special Marine Warning	PHI		119 min
Jul 31, 5:31 PM EDT	Flash Flood Warning	PHI	Burlington, Monmouth, Ocean	4 hr
Jul 31, 5:48 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	3 hr

Nearby

Tornado Warnings in New Jersey, 2009 Every tornado warning in 2009 Tornadoes 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.