Alert archive / New Jersey / Tornado Warnings in 2010

Tornado Warning 4, NWS Philadelphia/Mount Holly

July 23, 2010Morris County, New Jersey

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 23, 2010, 7:56 PM EDT for Morris County, New Jersey. It was in force for 34 min. 3 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: Jul 23, 2010, 7:56 PM EDT (23:56 UTC)
Expired: Jul 23, 2010, 8:30 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Morris County, NJ

The radar

The Philadelphia radar (KDIX), 115 km from the middle of the area, began a volume at 23:59 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 23, 8:00 PM EDT	TSTM WND DMG	Kinnelon, NJ	TREES AND WIRES DOWN.
Jul 23, 8:01 PM EDT	HAIL 0.75	Butler, NJ	DIME SIZE HAIL
Jul 23, 8:05 PM EDT	HAIL 0.75	Riverdale, NJ

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 23, 5:55 PM EDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.9 hours before the alert went out and 128 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: 78 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 736 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

643 
WFUS51 KPHI 232356
TORPHI
NJC027-240030-
/O.NEW.KPHI.TO.W.0004.100723T2356Z-100724T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
756 PM EDT FRI JUL 23 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN MORRIS COUNTY IN NORTHERN NEW JERSEY...

* UNTIL 830 PM EDT

* AT 750 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR BUTLER...OR
  15 MILES NORTHWEST OF PATERSON...MOVING SOUTHEAST AT 55 MPH.

* THE TORNADO WILL BE NEAR...
  PEQUANNOCK TOWNSHIP AND LINCOLN PARK BY 800 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM EDT SATURDAY MORNING
FOR NORTHWESTERN NEW JERSEY AND NORTHEAST PENNSYLVANIA.

&&

LAT...LON 4089 7433 4101 7454 4105 7450 4104 7448
      4105 7447 4105 7444 4102 7442 4100 7430
      4097 7427 4092 7428 4089 7427
TIME...MOT...LOC 2355Z 306DEG 46KT 4101 7431

$$

NIERENBERG

1 follow-up statement

037 
WWUS51 KPHI 240018
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
818 PM EDT FRI JUL 23 2010

NJC027-240030-
/O.CON.KPHI.TO.W.0004.000000T0000Z-100724T0030Z/
MORRIS NJ-
818 PM EDT FRI JUL 23 2010

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM EDT FOR
NORTHEASTERN MORRIS COUNTY...

AT 816 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A LIKELY TORNADO.  THIS TORNADO WAS LOCATED NEAR LINCOLN 
PARK...OR 8 MILES WEST OF PATERSON...MOVING SOUTHEAST AT 25 MPH.

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 TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM EDT SATURDAY MORNING
FOR NORTHWESTERN NEW JERSEY AND NORTHEAST PENNSYLVANIA.

&&

LAT...LON 4089 7433 4093 7439 4096 7439 4097 7438
      4100 7436 4100 7430 4097 7427 4092 7428
      4089 7427
TIME...MOT...LOC 0018Z 310DEG 20KT 4093 7430

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 1:09 PM EDT	Heat Advisory	PHI	Atlantic, Cape May, Cumberland	2 hr
Jul 23, 3:24 PM EDT	Excessive Heat Warning	PHI	Burlington, Camden, Gloucester, Mercer	48 hr
Jul 23, 3:24 PM EDT	Heat Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Hunterdon, Middlesex and 7 more	51 hr
Jul 23, 6:53 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	52 min
Jul 23, 7:36 PM EDT	Tornado Warning	PHI	Morris, Sussex	24 min

Nearby

Tornado Warnings in New Jersey, 2010 Every tornado warning in 2010 Tornadoes in 2010

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.