Alert archive / New Jersey / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 148, NWS Philadelphia/Mount Holly

July 27, 20144 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 27, 2014, 11:32 PM EDT for 4 states. It was in force for 58 min. 8 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 27, 2014, 11:32 PM EDT (03:32 UTC)
Expired: Jul 28, 2014, 12:30 AM EDT
In force: 58 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, Delaware County, PA, Philadelphia County, PA

The radar

The Dover AFB radar (KDOX), 102 km from the middle of the area, began a volume at 03:36 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 27, 11:36 PM EDT	TSTM WND DMG	Middletown Twp, PA	A FEW TREES AND LIMBS DOWN WITH ROADS BLOCKED OFF IN MIDDLETOWN TWP.
Jul 27, 11:40 PM EDT	HAIL 0.88	Media, PA
Jul 27, 11:48 PM EDT	TSTM WND DMG	Collingdale, PA	TREES AND WIRES DOWN IN COLLINGDALE.
Jul 27, 11:49 PM EDT	TSTM WND DMG	Folcroft, PA	TREES AND WIRES DOWN IN FOLCROFT.
Jul 27, 11:50 PM EDT	TSTM WND DMG	Glenolden, PA	TREES AND WIRES DOWN IN GLENOLDEN.
Jul 27, 11:50 PM EDT	TSTM WND DMG	Philadelphia, PA	THREE TREES DOWN IN PHILADELPHIA.
Jul 27, 11:50 PM EDT	TSTM WND DMG	Upper Darby, PA	TREES AND WIRES DOWN IN UPPER DARBY.
Jul 27, 11:55 PM EDT	HAIL 0.25	Drexel Hill, PA

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 00:00Z, 3.5 hours before the alert went out and 175 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: 1013 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1007 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

742 
WUUS51 KPHI 280332
SVRPHI
DEC003-MDC015-NJC005-007-015-033-PAC045-101-280430-
/O.NEW.KPHI.SV.W.0148.140728T0332Z-140728T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1132 PM EDT SUN JUL 27 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  NORTHERN CECIL COUNTY IN NORTHEAST MARYLAND...
  WEST CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 1230 AM EDT

* AT 1130 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  NARBERTH TO PERRYVILLE...MOVING EAST AT 20 MPH. THESE STORMS ARE
  CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN
  EXCESS OF 60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  CHARLESTOWN AND TALLEYVILLE AROUND 1140 PM EDT...
  NEWARK AND SWARTHMORE AROUND 1145 PM EDT...
  ELSMERE AND YEADON AROUND 1150 PM EDT...
  NEWPORT AND CHESTER AROUND 1155 PM EDT...
  FOLCROFT AROUND MIDNIGHT EDT...
  GLASGOW AND PHILADELPHIA INTERNATIONAL ARPT AROUND 1205 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

&&

LAT...LON 3973 7589 3972 7578 3980 7571 3984 7560
      3994 7554 4004 7534 3998 7527 4000 7522
      3999 7468 3951 7553 3957 7552 3959 7555
      3949 7558 3950 7600 3952 7599 3956 7608
      3960 7611
TIME...MOT...LOC 0331Z 272DEG 19KT 4001 7526 3956 7606

$$

IOVINO

1 follow-up statement

325 
WWUS51 KPHI 280359
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1159 PM EDT SUN JUL 27 2014

DEC003-MDC015-NJC005-007-015-033-PAC045-101-280430-
/O.CON.KPHI.SV.W.0148.000000T0000Z-140728T0430Z/
CAMDEN NJ-PHILADELPHIA PA-DELAWARE PA-GLOUCESTER NJ-NEW CASTLE DE-
CECIL MD-BURLINGTON NJ-SALEM NJ-
1159 PM EDT SUN JUL 27 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR NORTHWESTERN SALEM...WEST CENTRAL BURLINGTON...NORTHERN CECIL...
NORTHERN NEW CASTLE...NORTHWESTERN GLOUCESTER...SOUTHERN DELAWARE...
SOUTHERN PHILADELPHIA AND NORTHWESTERN CAMDEN COUNTIES...

AT 1155 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS 
WERE LOCATED ALONG A LINE EXTENDING FROM PHILADELPHIA TO WILMINGTON 
TO ELKTON...MOVING EAST AT 20 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  PENNS GROVE...PENNSAUKEN...CAMDEN AND BEAR BY 1210 AM EDT...
  NEW CASTLE AND WOODLYNNE BY 1215 AM EDT...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

LAT...LON 3972 7578 3980 7571 4000 7522 3999 7468
      3951 7553 3957 7552 3959 7555 3949 7558
      3950 7600 3952 7599 3956 7608
TIME...MOT...LOC 0358Z 272DEG 19KT 4000 7507 3956 7588

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 11:28 PM EDT	Special Weather Statement	PHI	New Castle	62 min
Jul 28, 12:35 AM EDT	Special Weather Statement	PHI	New Castle	85 min
Jul 28, 12:59 AM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jul 28, 1:39 AM EDT	River Flood Warning	PHI	New Castle	8 hr
Jul 27, 10:56 PM EDT	Special Weather Statement	PHI	Warren	34 min
Jul 28, 1:00 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	45 min
Jul 28, 1:26 AM EDT	Special Marine Warning	PHI		49 min
Jul 28, 1:45 AM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	4 hr
Jul 28, 2:04 AM EDT	Special Weather Statement	PHI	Monmouth, Ocean	56 min
Jul 27, 8:28 PM EDT	Special Weather Statement	PHI	Berks	62 min
Jul 27, 8:42 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	3 hr
Jul 27, 9:12 PM EDT	Special Weather Statement	PHI	Chester	63 min
Jul 27, 9:21 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	54 min
Jul 27, 9:43 PM EDT	Flash Flood Warning	PHI	Berks, Chester, Montgomery	4 hr
Jul 27, 10:20 PM EDT	Special Weather Statement	PHI	Chester, Montgomery	55 min
Jul 27, 10:26 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Northampton	3 hr
Jul 27, 10:33 PM EDT	Flash Flood Warning	PHI	Chester, Montgomery	4 hr
Jul 27, 10:44 PM EDT	Special Weather Statement	PHI	Chester, Delaware	61 min
Jul 27, 10:47 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	43 min
Jul 28, 12:31 AM EDT	Flash Flood Warning	PHI	Delaware, Montgomery, Philadelphia	3 hr
Jul 28, 2:58 AM EDT	River Flood Warning	PHI	Chester	8 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2014 Severe Thunderstorm Warnings in Pennsylvania, 2014 Severe Thunderstorm Warnings in Delaware, 2014 Every severe thunderstorm warning in 2014

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.