Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 19, NWS Philadelphia/Mount Holly

May 14, 20104 counties in Pennsylvania; Hunterdon County, Somerset County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 14, 2010, 5:53 PM EDT for 4 counties in Pennsylvania; Hunterdon County, Somerset County, Warren County, New Jersey. It was in force for 67 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: May 14, 2010, 5:53 PM EDT (21:53 UTC)
Expired: May 14, 2010, 7:00 PM EDT
In force: 67 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Somerset County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 76 km from the middle of the area, began a volume at 21:55 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
May 14, 5:55 PM EDT	TSTM WND GST 60	Allentown, PA	A FEW TREES DOWN
May 14, 5:55 PM EDT	HAIL 1.75	Allentown, PA	HAIL AS LARGE AS GOLF BALLS IN THE ALLENTOWN AREA, ALSO A FEW TREES DOWN IN LEHIGH COUNTY.
May 14, 5:57 PM EDT	FUNNEL CLOUD	Emmaus, PA	A COUPLE OF FUNNEL CLOUD SIGHTINGS IN LEHIGH COUNTY

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
May 14, 3:43 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.9 hours before the alert went out and 152 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 557 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 187 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.

091 
WUUS51 KPHI 142153
SVRPHI
NJC019-035-041-PAC011-017-077-095-142300-
/O.NEW.KPHI.SV.W.0019.100514T2153Z-100514T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
553 PM EDT FRI MAY 14 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME EAST CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...
  SOUTHEASTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF ALLENTOWN...
  SOUTHERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  EXTREME WEST CENTRAL SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  SOUTHERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  EXTREME SOUTHWESTERN WARREN COUNTY IN NORTHWEST NEW JERSEY...
  NORTHERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 700 PM EDT

* AT 551 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  ALLENTOWN...AND MOVING EAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HELLERTOWN AROUND 600 PM EDT...
  PLEASANT VALLEY AND SPRINGTOWN AROUND 605 PM EDT...
  REVERE...OTTSVILLE...FERNDALE AND BEDMINSTER AROUND 615 PM EDT...
  ERWINNA...TINICUM TOWNSHIP AND FRENCHTOWN AROUND 620 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME 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.

HAIL UP TO GOLF BALL SIZE HAS BEEN REPORTED IN SOUTH ALLENTOWN WITH 
THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE 
ACTION TO PROTECT LIFE AND PROPERTY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4053 7475 4050 7477 4050 7480 4045 7477
      4042 7478 4034 7493 4048 7560 4072 7549
      4058 7473
TIME...MOT...LOC 2153Z 288DEG 36KT 4056 7544

$$

HAYES

1 follow-up statement

221 
WWUS51 KPHI 142251
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
651 PM EDT FRI MAY 14 2010

NJC019-035-041-PAC011-017-077-095-142301-
/O.EXP.KPHI.SV.W.0019.000000T0000Z-100514T2300Z/
WARREN NJ-HUNTERDON NJ-SOMERSET NJ-BERKS PA-LEHIGH PA-NORTHAMPTON PA-
BUCKS PA-
651 PM EDT FRI MAY 14 2010

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BUCKS...SOUTHERN
NORTHAMPTON...SOUTHEASTERN LEHIGH...EXTREME EAST CENTRAL BERKS...
EXTREME WEST CENTRAL SOMERSET...SOUTHERN HUNTERDON AND EXTREME
SOUTHWESTERN WARREN COUNTIES WILL EXPIRE AT 700 PM EDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.

LAT...LON 4053 7475 4050 7477 4050 7480 4045 7477
      4042 7478 4034 7493 4048 7560 4072 7549
      4058 7473
TIME...MOT...LOC 2251Z 288DEG 36KT 4038 7471

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 3:52 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	53 min
May 14, 4:18 PM EDT	Special Weather Statement	PHI	Carbon	57 min
May 14, 4:26 PM EDT	Special Weather Statement	PHI	Carbon, Northampton	64 min
May 14, 4:42 PM EDT	Severe Thunderstorm Warning	PHI	Berks	63 min
May 14, 5:04 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	56 min
May 14, 5:07 PM EDT	Special Weather Statement	PHI	Northampton	53 min
May 14, 5:38 PM EDT	Tornado Warning	PHI	Berks, Lehigh	37 min
May 14, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	56 min
May 14, 6:11 PM EDT	Special Weather Statement	PHI	Carbon	64 min
May 14, 6:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery, Philadelphia	65 min
May 14, 6:35 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	55 min
May 14, 6:09 PM EDT	Special Weather Statement	PHI	Morris	66 min
May 14, 6:58 PM EDT	Special Weather Statement	PHI	Mercer, Monmouth, Ocean	62 min
May 14, 7:04 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	56 min
May 14, 7:19 PM EDT	Special Marine Warning	PHI		56 min
May 14, 7:19 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	56 min
May 14, 7:27 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	63 min
May 14, 7:33 PM EDT	Special Marine Warning	PHI		87 min
May 14, 7:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	57 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010 Severe Thunderstorm Warnings in New Jersey, 2010 Every severe thunderstorm warning 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.