Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 44, NWS Philadelphia/Mount Holly

May 15, 2011Bucks County, Pennsylvania; Hunterdon County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 15, 2011, 5:46 PM EDT for Bucks County, Pennsylvania; Hunterdon County, Warren County, New Jersey. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 15, 2011, 5:46 PM EDT (21:46 UTC)
Expired: May 15, 2011, 6:45 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 105 km from the middle of the area, began a volume at 21:47 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.8 hours before the alert went out and 184 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 504 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 236 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.

173 
WUUS51 KPHI 152146
SVRPHI
NJC019-041-PAC017-152245-
/O.NEW.KPHI.SV.W.0044.110515T2146Z-110515T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
546 PM EDT SUN MAY 15 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  WARREN COUNTY IN NORTHWEST NEW JERSEY...
  NORTH CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 645 PM EDT

* AT 543 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR DUBLIN...OR 18 MILES SOUTHEAST OF
  ALLENTOWN...AND MOVING NORTH AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PIPERSVILLE AROUND 550 PM EDT...
  OTTSVILLE AROUND 555 PM EDT...
  FERNDALE AND REVERE AROUND 600 PM EDT...
  RIEGELSVILLE AND MILFORD AROUND 610 PM EDT...
  ALPHA AND BLOOMSBURY AROUND 620 PM EDT...
  HARMONY AROUND 630 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 4091 7477 4087 7481 4083 7482 4070 7498
      4068 7490 4034 7513 4040 7534 4059 7526
      4062 7520 4075 7519 4078 7516 4077 7513
      4082 7509 4084 7510 4086 7505 4099 7514
      4108 7497
TIME...MOT...LOC 2145Z 193DEG 26KT 4042 7523

$$

HAYES

4 follow-up statements

074 
WWUS51 KPHI 152205
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
605 PM EDT SUN MAY 15 2011

NJC019-041-PAC017-152245-
/O.CON.KPHI.SV.W.0044.000000T0000Z-110515T2245Z/
WARREN NJ-HUNTERDON NJ-BUCKS PA-
605 PM EDT SUN MAY 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTH CENTRAL BUCKS...NORTHWESTERN HUNTERDON AND WARREN
COUNTIES...

AT 604 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR FERNDALE...OR 11 MILES SOUTH OF
EASTON...MOVING NORTH AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  RIEGELSVILLE AND MILFORD BY 615 PM EDT...
  ALPHA BY 625 PM EDT...
  PHILLIPSBURG AND BLOOMSBURY BY 630 PM EDT...
  HARMONY BY 640 PM EDT...
  ROXBURG...BELVIDERE...6 MILES WEST OF BRASS CASTLE AND 6 MILES WEST
  OF PLEASANT VALLEY BY 645 PM EDT...

LAT...LON 4091 7477 4083 7482 4070 7498 4068 7490
      4044 7508 4049 7530 4059 7526 4062 7520
      4075 7519 4078 7516 4077 7513 4079 7510
      4084 7510 4086 7505 4099 7514 4108 7497
TIME...MOT...LOC 2205Z 194DEG 22KT 4054 7520

$$

HAYES

281 
WWUS51 KPHI 152216
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
616 PM EDT SUN MAY 15 2011

NJC019-041-PAC017-152245-
/O.CON.KPHI.SV.W.0044.000000T0000Z-110515T2245Z/
WARREN NJ-HUNTERDON NJ-BUCKS PA-
616 PM EDT SUN MAY 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTH CENTRAL BUCKS...NORTHWESTERN HUNTERDON AND WARREN
COUNTIES...

AT 613 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS LOCATED NEAR
RIEGELSVILLE...OR 8 MILES SOUTH OF EASTON...MOVING NORTH AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  ALPHA BY 625 PM EDT...
  PHILLIPSBURG AND BLOOMSBURY BY 630 PM EDT...
  HARMONY BY 640 PM EDT...
  ROXBURG...BELVIDERE...6 MILES WEST OF BRASS CASTLE AND 6 MILES WEST
  OF PLEASANT VALLEY BY 645 PM EDT...

LAT...LON 4091 7477 4083 7482 4070 7498 4068 7490
      4044 7508 4049 7530 4059 7526 4062 7520
      4075 7519 4078 7516 4077 7513 4079 7510
      4084 7510 4086 7505 4099 7514 4108 7497
TIME...MOT...LOC 2216Z 194DEG 22KT 4060 7518

$$

HAYES

513 
WWUS51 KPHI 152229
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
629 PM EDT SUN MAY 15 2011

PAC017-152239-
/O.CAN.KPHI.SV.W.0044.000000T0000Z-110515T2245Z/
BUCKS PA-
629 PM EDT SUN MAY 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BUCKS COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS EXITED THE AREA.

LAT...LON 4091 7477 4087 7481 4083 7482 4070 7498
      4065 7492 4064 7520 4075 7519 4078 7516
      4077 7513 4079 7510 4084 7510 4086 7505
      4099 7514 4102 7505 4108 7497
TIME...MOT...LOC 2229Z 194DEG 22KT 4068 7515

$$

NJC019-041-152245-
/O.CON.KPHI.SV.W.0044.000000T0000Z-110515T2245Z/
WARREN NJ-HUNTERDON NJ-
629 PM EDT SUN MAY 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTH CENTRAL HUNTERDON AND WARREN COUNTIES...

AT 625 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS LOCATED NEAR ALPHA...OR
NEAR EASTON...MOVING NORTH AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  HARMONY BY 640 PM EDT...
  ROXBURG...BELVIDERE...6 MILES WEST OF BRASS CASTLE AND 6 MILES WEST
  OF PLEASANT VALLEY BY 645 PM EDT...

LAT...LON 4091 7477 4087 7481 4083 7482 4070 7498
      4065 7492 4064 7520 4075 7519 4078 7516
      4077 7513 4079 7510 4084 7510 4086 7505
      4099 7514 4102 7505 4108 7497
TIME...MOT...LOC 2229Z 194DEG 22KT 4068 7515

$$

HAYES

496 
WWUS51 KPHI 152242
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
642 PM EDT SUN MAY 15 2011

NJC019-041-152252-
/O.EXP.KPHI.SV.W.0044.000000T0000Z-110515T2245Z/
WARREN NJ-HUNTERDON NJ-
642 PM EDT SUN MAY 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL HUNTERDON AND
WARREN COUNTIES WILL EXPIRE AT 645 PM EDT...

LAT...LON 4091 7477 4087 7481 4083 7482 4070 7498
      4065 7492 4064 7520 4075 7519 4078 7516
      4077 7513 4079 7510 4084 7510 4086 7505
      4099 7514 4102 7505 4108 7497
TIME...MOT...LOC 2242Z 194DEG 22KT 4076 7512

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 11:46 PM EDT	Special Weather Statement	PHI	Berks, Chester, Delaware, Montgomery	89 min
May 15, 12:52 AM EDT	Special Weather Statement	PHI	Bucks, Carbon, Lehigh, Monroe, Montgomery, Northampton and 1 more	83 min
May 15, 2:26 PM EDT	Special Weather Statement	PHI	Berks	64 min
May 15, 2:46 PM EDT	Special Weather Statement	PHI	Schuylkill	59 min
May 15, 2:55 PM EDT	Special Weather Statement	PHI	Delaware	65 min
May 15, 3:30 PM EDT	Special Weather Statement	PHI	Berks	60 min
May 15, 3:37 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	53 min
May 15, 3:39 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	44 min
May 15, 4:14 PM EDT	Special Weather Statement	PHI	Lehigh	61 min
May 15, 4:19 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	56 min
May 15, 4:31 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	59 min
May 15, 4:35 PM EDT	Special Weather Statement	PHI	Lehigh	55 min
May 15, 4:52 PM EDT	Special Weather Statement	PHI	Northampton	68 min
May 15, 5:03 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Monroe, Northampton	57 min
May 15, 5:33 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh	57 min
May 15, 5:37 PM EDT	Special Weather Statement	PHI	Bucks	53 min
May 15, 6:39 PM EDT	Special Weather Statement	PHI	Berks	66 min
May 15, 7:20 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	3 hr
May 15, 7:28 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	62 min
May 15, 7:37 PM EDT	Special Weather Statement	PHI	Berks	53 min
May 15, 1:19 AM EDT	Special Weather Statement	PHI	Atlantic, Cape May	86 min
May 15, 2:23 AM EDT	Special Weather Statement	PHI	Atlantic, Monmouth, Ocean	2 hr
May 15, 2:33 PM EDT	Special Weather Statement	PHI	Cumberland	57 min
May 15, 3:23 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	67 min
May 15, 3:57 PM EDT	Special Weather Statement	PHI	Cumberland	63 min
May 15, 4:39 PM EDT	Special Weather Statement	PHI	Middlesex, Somerset	66 min
May 15, 5:21 PM EDT	Special Weather Statement	PHI	Morris	54 min
May 15, 5:23 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	67 min
May 15, 6:41 PM EDT	Special Weather Statement	PHI	Sussex, Warren	64 min
May 15, 6:49 PM EDT	Special Weather Statement	PHI	Morris, Somerset	56 min
May 15, 7:41 PM EDT	Special Weather Statement	PHI	Sussex	64 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2011 Severe Thunderstorm Warnings in Pennsylvania, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.