Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 21, 2012, 9:38 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania; 8 counties in New Jersey. It was in force for 67 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
- Apr 21, 2012, 9:38 PM EDT (01:38 UTC)
- Expired
- Apr 21, 2012, 10:45 PM EDT
- In force
- 67 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Burlington County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Somerset County, NJ, Warren County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 01:39 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 |
|---|---|---|---|
| Apr 21, 10:07 PM EDT | TSTM WND DMG | Lebanon, NJ | WIRE DOWN |
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 00:00Z, 1.6 hours before the alert went out and 165 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.
- Mixed-layer CAPE
- 46 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 687 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
198
WUUS51 KPHI 220138
SVRPHI
NJC005-019-021-023-025-027-035-041-PAC017-091-101-220245-
/O.NEW.KPHI.SV.W.0004.120422T0138Z-120422T0245Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
938 PM EDT SAT APR 21 2012
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
MERCER COUNTY IN CENTRAL NEW JERSEY...
THIS INCLUDES THE CITY OF TRENTON...
WESTERN MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
THIS INCLUDES THE CITY OF NEW BRUNSWICK...
SOUTHWESTERN 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...
SOUTHERN WARREN COUNTY IN NORTHWEST NEW JERSEY...
EASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
* UNTIL 1045 PM EDT
* AT 935 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM FERNDALE TO RICHBORO TO HOLMESBURG...OR ALONG A LINE EXTENDING
FROM 10 MILES SOUTH OF EASTON TO 14 MILES WEST OF TRENTON TO 7
MILES NORTHEAST OF PHILADELPHIA...AND MOVING EAST AT 30 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
BLOOMSBURY...MILFORD...BENSALEM AND NEWTOWN AROUND 945 PM EDT...
SERGEANTSVILLE...WOODSIDE AND WILLINGBORO AROUND 950 PM EDT...
SAND BROOK...YARDLEY AND LEVITTOWN AROUND 955 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 4017 7441 4008 7455 4005 7454 3997 7502
3998 7501 4000 7504 3997 7511 4028 7510
4058 7527 4062 7519 4066 7520 4093 7454
4070 7442 4067 7445 4066 7439 4061 7443
4060 7436 4045 7427 4017 7428
TIME...MOT...LOC 0138Z 255DEG 25KT 4056 7513 4030 7498
4006 7500
$$
MPD2 follow-up statements
553
WWUS51 KPHI 220151
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
951 PM EDT SAT APR 21 2012
PAC091-101-220202-
/O.CAN.KPHI.SV.W.0004.000000T0000Z-120422T0245Z/
MONTGOMERY PA-PHILADELPHIA PA-
951 PM EDT SAT APR 21 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PHILADELPHIA AND
SOUTHEASTERN MONTGOMERY COUNTIES IS CANCELLED...
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
LAT...LON 4017 7428 4017 7441 4008 7455 4005 7454
3999 7496 4012 7493 4031 7496 4054 7510
4062 7519 4066 7520 4093 7454 4070 7442
4067 7445 4066 7440 4061 7443 4060 7436
4045 7427
TIME...MOT...LOC 0152Z 255DEG 25KT 4059 7501 4033 7486
4009 7488
$$
NJC005-019-021-023-025-027-035-041-PAC017-220245-
/O.CON.KPHI.SV.W.0004.000000T0000Z-120422T0245Z/
WARREN NJ-HUNTERDON NJ-MERCER NJ-MORRIS NJ-SOMERSET NJ-BUCKS PA-
MIDDLESEX NJ-BURLINGTON NJ-MONMOUTH NJ-
951 PM EDT SAT APR 21 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR WESTERN MONMOUTH...NORTHWESTERN BURLINGTON...MIDDLESEX...EASTERN
BUCKS...SOMERSET...SOUTHWESTERN MORRIS...MERCER...HUNTERDON AND
SOUTHERN WARREN COUNTIES...
AT 950 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM MILFORD TO PENNINGTON TO CROYDON...OR ALONG A LINE
EXTENDING FROM 12 MILES SOUTHEAST OF EASTON TO 9 MILES NORTHWEST OF
TRENTON TO 12 MILES SOUTHWEST OF TRENTON...MOVING EAST AT 30 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
TULLYTOWN...MORRISVILLE...PENNINGTON AND FLORENCE BY 1000 PM EDT...
CLINTON...ANNANDALE...HIGH BRIDGE AND JACKSONVILLE BY 1005 PM
EDT...
LEBANON AND JOBSTOWN BY 1010 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 4017 7428 4017 7441 4008 7455 4005 7454
3999 7496 4012 7493 4031 7496 4054 7510
4062 7519 4066 7520 4093 7454 4070 7442
4067 7445 4066 7440 4061 7443 4060 7436
4045 7427
TIME...MOT...LOC 0152Z 255DEG 25KT 4059 7501 4033 7486
4009 7488
$$
MPD531
WWUS51 KPHI 220224
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1024 PM EDT SAT APR 21 2012
NJC005-019-021-025-041-PAC017-220234-
/O.CAN.KPHI.SV.W.0004.000000T0000Z-120422T0245Z/
WARREN NJ-HUNTERDON NJ-MERCER NJ-BUCKS PA-BURLINGTON NJ-MONMOUTH NJ-
1024 PM EDT SAT APR 21 2012
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN MONMOUTH...
NORTHWESTERN BURLINGTON...EASTERN BUCKS...MERCER...HUNTERDON AND
SOUTHERN WARREN COUNTIES IS CANCELLED...
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
LAT...LON 4034 7434 4026 7448 4033 7462 4039 7462
4038 7472 4051 7477 4062 7470 4064 7473
4070 7471 4078 7489 4093 7454 4070 7442
4067 7445 4066 7440 4061 7443 4060 7435
4044 7427
TIME...MOT...LOC 0224Z 243DEG 44KT 4075 7476 4050 7460
4026 7463
$$
NJC023-027-035-220245-
/O.CON.KPHI.SV.W.0004.000000T0000Z-120422T0245Z/
MORRIS NJ-SOMERSET NJ-MIDDLESEX NJ-
1024 PM EDT SAT APR 21 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR MIDDLESEX...SOMERSET AND SOUTHWESTERN MORRIS COUNTIES...
AT 1024 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM LONG VALLEY TO MILLSTONE TO 8
MILES SOUTH OF KINGSTON...OR ALONG A LINE EXTENDING FROM 15 MILES
WEST OF MORRISTOWN TO SOMERVILLE TO 7 MILES EAST OF TRENTON...MOVING
NORTHEAST AT 50 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
CHESTER...SOUTH BRUNSWICK...MARTINSVILLE AND SOUTH BOUND BROOK BY
1030 PM EDT...
SUCCASUNNA...MILLINGTON...BASKING RIDGE AND SOUTH PLAINFIELD BY
1035 PM EDT...
VICTORY GARDENS AND DOVER BY 1040 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 4034 7434 4026 7448 4033 7462 4039 7462
4038 7472 4051 7477 4062 7470 4064 7473
4070 7471 4078 7489 4093 7454 4070 7442
4067 7445 4066 7440 4061 7443 4060 7435
4044 7427
TIME...MOT...LOC 0224Z 243DEG 44KT 4075 7476 4050 7460
4026 7463
$$
MPDThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 8:41 PM EDT | Special Weather Statement | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Monroe and 3 more | 109 min |
| Apr 21, 8:45 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 30 min |
| Apr 22, 3:45 AM EDT | Wind Advisory | PHI | Delaware, Philadelphia | 20 hr |
| Apr 22, 4:14 AM EDT | Coastal Flood Advisory | PHI | Delaware, Philadelphia | 20 hr |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2012Severe Thunderstorm Warnings in Pennsylvania, 2012Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.