Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 5, NWS Philadelphia/Mount Holly

March 29, 20094 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 29, 2009, 6:11 PM EDT for 4 states. It was in force for 64 min. 14 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
Mar 29, 2009, 6:11 PM EDT (22:11 UTC)
Expired
Mar 29, 2009, 7:15 PM EDT
In force
64 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties New Castle County, DE, Cecil County, MD, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 83 km from the middle of the area, began a volume at 22:11 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

TimeReportWhereRemark
Mar 29, 6:15 PM EDTHAIL 0.88New Castle, DEDIME TO NICKEL SIZE HAIL REPORTED IN NEW CASTLE.
Mar 29, 6:18 PM EDTTSTM WND GST 44Wilmington, DE44 MPH THUNDERSTORM WIND GUST MEASURED AT THE NEW CASTLE COUNTY AIRPORT IN WILMINGTON.
Mar 29, 6:20 PM EDTTSTM WND DMGNew Castle, DETREES REPORTED DOWN IN THE AREA JUST NORTH OF ROUTE 202 AND INTERSTATE 95. DIME TO NICKEL SIZE HAIL ALSO REPORTED IN NEW CASTLE AND WILMINGTON.
Mar 29, 6:25 PM EDTHAIL 0.88Talleyville, DENICKEL SIZE HAIL REPORTED IN TALLEYVILLE.
Mar 29, 6:28 PM EDTHAIL 0.75Boothwyn, PADIME TO PENNY SIZE HAIL REPORTED IN BOOTHWYN AND CONCORD.
Mar 29, 6:30 PM EDTTSTM WND DMG5 S Fricks, PAIN MONTGOMERY TOWNSHIP, WETHERSFIELD AND SUMMER RIDGE DEVELOPMENTS OFF OF UPPER STATE ROAD BETWEEN HORSHAM ROAD AND COUNTY LINE ROAD, OVER 20 HOMES WITH DAMAGE TO SIDING, WINDOWS AND ROOF SHINGLES. ONE HOME WITH WINDOWS BLOWN OUT. NUMEROUS TREES WERE ALSO REPO
Mar 29, 6:30 PM EDTHAIL 1.75Media, PAGOLF BALL SIZED HAIL REPORTED IN MEDIA.
Mar 29, 6:35 PM EDTHAIL 0.75Clifton Heights, PAPENNY SIZE HAIL REPORTED IN CLIFTON HEIGHTS AND WAS COVERING THE GROUND.
Mar 29, 6:45 PM EDTHAIL 1Lansdowne, PAQUARTER SIZE HAIL REPORTED IN LANSDOWNE.
Mar 29, 6:55 PM EDTTSTM WND DMGDarby Township, PAWIRES REPORTED DOWN IN UPPER DARBY.
Mar 29, 6:55 PM EDTHAIL 0.88Wyncote, PANICKEL SIZE HAIL REPORTED IN WYNCOTE.
Mar 29, 7:00 PM EDTHAIL 1.75Northeast Philadelphia, PAGOLF BALL SIZE HAIL REPORTED IN NORTHEAST SECTION OF PHILADELPHIA. ESTIMATED WIND GUST OF 50 MPH ALSO REPORTED.
Mar 29, 7:01 PM EDTTSTM WND GST 47Northeast Philadelphia, PA47 MPH WIND GUST WAS REPORTED AT THE NORTHEAST PHILADELPHIA AIRPORT.
Mar 29, 7:05 PM EDTHAIL 0.88Camden, NJSEVERAL REPORTS OF DIME TO NICKEL SIZE HAIL IN PENNSAUKEN AND CAMDEN CITY.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.2 hours before the alert went out and 202 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, Washington/Dulle, VA at 12:00Z on 2009-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2009-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 246 square meters per square second.1939587897117136Sfc1 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
491 m above ground
0-6 km bulk shear
79 kt
0-1 km storm-relative helicity
246 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 292211
SVRPHI
DEC003-MDC015-NJC005-007-015-033-PAC029-045-091-101-292315-
/O.NEW.KPHI.SV.W.0005.090329T2211Z-090329T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
611 PM EDT SUN MAR 29 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CECIL COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF ELKTON...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITIES OF...WILMINGTON...NEWARK...
  CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF WEST CHESTER...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF WILLOW GROVE...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  WEST CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 715 PM EDT

* AT 609 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  PIKE CREEK...OR NEAR NEWARK...AND MOVING NORTHEAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TALLEYVILLE AND WILMINGTON BY 620 PM EDT...
  ELAM BY 625 PM EDT...
  CHELSEA AND CONCORDVILLE BY 630 PM EDT...
  NETHER PROVIDENCE TOWNSHIP...CHESTER AND LIMA BY 635 PM EDT...
  SWARTHMORE AND FOLCROFT BY 640 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.

&&

LAT...LON 4039 7544 4009 7496 4004 7499 4003 7498
      4004 7498 4006 7493 3997 7479 3966 7552
      3969 7552 3962 7560 3950 7587 3955 7587
      3955 7588 3979 7596
TIME...MOT...LOC 2211Z 238DEG 41KT 3973 7568

$$

STAUBER
2 follow-up statements
000 
WWUS51 KPHI 292225
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
625 PM EDT SUN MAR 29 2009

MDC015-292235-
/O.CAN.KPHI.SV.W.0005.000000T0000Z-090329T2315Z/
CECIL MD-
625 PM EDT SUN MAR 29 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CECIL COUNTY IS
CANCELLED...

LAT...LON 3972 7561 3993 7576 4035 7540 4009 7496
      4004 7499 4003 7498 4004 7498 4006 7493
      3997 7479
TIME...MOT...LOC 2225Z 238DEG 41KT 3983 7556

$$

DEC003-NJC005-007-015-033-PAC029-045-091-101-292315-
/O.CON.KPHI.SV.W.0005.000000T0000Z-090329T2315Z/
SALEM NJ-CAMDEN NJ-GLOUCESTER NJ-DELAWARE PA-PHILADELPHIA PA-
CHESTER PA-MONTGOMERY PA-NEW CASTLE DE-BURLINGTON NJ-
625 PM EDT SUN MAR 29 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR WEST CENTRAL BURLINGTON...NORTHEASTERN NEW CASTLE...MONTGOMERY...
EASTERN CHESTER...PHILADELPHIA...DELAWARE...NORTHWESTERN
GLOUCESTER...NORTHWESTERN CAMDEN AND EXTREME NORTH CENTRAL SALEM
COUNTIES...

AT 623 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR TALLEYVILLE...OR 6 MILES NORTHWEST OF WILMINGTON...
MOVING NORTHEAST AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  CHELSEA...CONCORDVILLE...BOOTHWYN AND ARDEN BY 630 PM EDT...
  VILLAGE GREEN-GREEN RIDGE...CHESTER HEIGHTS...BROOKHAVEN AND LIMA
  BY 635 PM EDT...
  SPRINGFIELD AND MEDIA BY 640 PM EDT...

LAT...LON 3972 7561 3993 7576 4035 7540 4009 7496
      4004 7499 4003 7498 4004 7498 4006 7493
      3997 7479
TIME...MOT...LOC 2225Z 238DEG 41KT 3983 7556

$$

AMC
000 
WWUS51 KPHI 292238
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
638 PM EDT SUN MAR 29 2009

DEC003-NJC033-292248-
/O.CAN.KPHI.SV.W.0005.000000T0000Z-090329T2315Z/
SALEM NJ-NEW CASTLE DE-
638 PM EDT SUN MAR 29 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE AND
EXTREME NORTH CENTRAL SALEM COUNTIES IS CANCELLED...

LAT...LON 3978 7540 4003 7552 4024 7522 4009 7496
      4004 7499 4003 7498 4004 7498 4006 7493
      3997 7479
TIME...MOT...LOC 2238Z 242DEG 41KT 3990 7530

$$

NJC005-007-015-PAC029-045-091-101-292315-
/O.CON.KPHI.SV.W.0005.000000T0000Z-090329T2315Z/
CAMDEN NJ-GLOUCESTER NJ-DELAWARE PA-PHILADELPHIA PA-CHESTER PA-
MONTGOMERY PA-BURLINGTON NJ-
638 PM EDT SUN MAR 29 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR WEST CENTRAL BURLINGTON...SOUTHEASTERN MONTGOMERY...EXTREME EAST
CENTRAL CHESTER...PHILADELPHIA...DELAWARE...NORTHWESTERN GLOUCESTER
AND NORTHWESTERN CAMDEN COUNTIES...

AT 636 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR FOLSOM...OR 12 MILES WEST OF CAMDEN...MOVING NORTHEAST
AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  SOUTH PHILADELPHIA...MILLBOURNE...MORRIS PARK AND ROXBOROUGH BY 645
  PM EDT...
  CENTER CITY...KENSINGTON...TEMPLE UNIVERSITY AND PHILADELPHIA BY
  650 PM EDT...
  WISSINOMING AND PENNSAUKEN BY 655 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 3978 7540 4003 7552 4024 7522 4009 7496
      4004 7499 4003 7498 4004 7498 4006 7493
      3997 7479
TIME...MOT...LOC 2238Z 242DEG 41KT 3990 7530

$$

STAUBER

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 29, 3:34 PM EDTGale WarningPHI24 hr
Mar 29, 7:09 PM EDTSevere Thunderstorm WarningPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more51 min
Mar 29, 7:53 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Middlesex, Monmouth, Ocean67 min
Mar 29, 4:41 PM EDTSevere Thunderstorm WarningPHIBerks94 min
Mar 29, 4:58 PM EDTTornado WarningPHIBerks62 min
Mar 29, 5:11 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh64 min
Mar 29, 5:27 PM EDTSevere Thunderstorm WarningPHILehigh63 min
Mar 29, 5:55 PM EDTSevere Thunderstorm WarningPHIBucks, Chester, Lehigh, Montgomery, Northampton50 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2009Severe Thunderstorm Warnings in Pennsylvania, 2009Severe Thunderstorm Warnings in Maryland, 2009Every severe thunderstorm 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.