Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 113, NWS Philadelphia/Mount Holly

July 2, 2006Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 2, 2006, 6:24 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 36 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: Jul 2, 2006, 6:24 PM EDT (22:24 UTC)
Expired: Jul 2, 2006, 7:00 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 86 km from the middle of the area, began a volume at 22:28 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 2, 6:40 PM EDT	TSTM WND DMG	Doylestown, PA	SEVERAL TREES AND WIRES DOWN COUNTYWIDE
Jul 2, 6:45 PM EDT	TSTM WND DMG	Norristown, PA	TREES DOWN.
Jul 2, 6:57 PM EDT	TSTM WND DMG	5 Nne Perkasie, PA	NUMEROUS TREES AND WIRES DOWN IN UPPER BUCKS 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
Jul 2, 4:03 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.4 hours before the alert went out and 208 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: 5 J/kg
Mixed-layer CIN: -287 J/kg
Mixed-layer LCL: 1250 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 205 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 022224
SVRPHI
PAC017-091-022300-
/O.NEW.KPHI.SV.W.0113.060702T2224Z-060702T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
624 PM EDT SUN JUL 2 2006

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA
  MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA

* UNTIL 700 PM EDT

* AT 619 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 18 MILES NORTH OF QUAKERTOWN TO 11 MILES NORTHWEST OF
  POTTSTOWN...OR ALONG A LINE EXTENDING FROM BETHLEHEM TO READING...
  AND MOVING EAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  POTTSTOWN...GILBERTSVILLE AND EAST GREENVILLE BY 630 PM EDT...
  QUAKERTOWN BY 635 PM EDT...
  SPRING MOUNT BY 640 PM EDT...
  COLLEGEVILLE...SOUDERTON AND PERKASIE BY 645 PM EDT...
  NORRISTOWN AND LANSDALE BY 650 PM EDT...

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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

LAT...LON 4055 7518 4055 7508 4043 7507 4040 7502
      4041 7499 4037 7496 4034 7496 4008 7528
      4016 7553 4021 7557 4026 7569 4044 7553
      4042 7550 4061 7521

$$ 

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 4:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	91 min
Jul 2, 5:47 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	58 min
Jul 2, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Chester	66 min
Jul 2, 6:12 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	63 min
Jul 2, 6:54 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	51 min
Jul 2, 6:58 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	32 min
Jul 2, 7:01 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery, Philadelphia	59 min
Jul 2, 7:38 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	37 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2006 Every severe thunderstorm warning in 2006

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.