Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 128, NWS Philadelphia/Mount Holly

August 14, 2005Berks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 14, 2005, 6:46 PM EDT for Berks County, Montgomery County, Pennsylvania. It was in force for 44 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: Aug 14, 2005, 6:46 PM EDT (22:46 UTC)
Expired: Aug 14, 2005, 7:30 PM EDT
In force: 44 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Berks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 110 km from the middle of the area, began a volume at 22:46 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
Aug 14, 6:51 PM EDT	TSTM WND DMG	Birdsboro, PA	NUMEROUS TREES AND WIRES DOWN FROM BIRDSBORO TO BOYERTOWN.
Aug 14, 7:22 PM EDT	TSTM WND DMG	2 Nw Kenilworth, PA	A TREE AND WIRES DOWN IN NORTH COVENTRY TOWNSHIP.
Aug 14, 7:22 PM EDT	TSTM WND DMG	Pottstown, PA	TREES AND WIRES DOWN.

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
Aug 14, 1:15 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.8 hours before the alert went out and 221 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: 853 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1333 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.6

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 142246
SVRPHI
PAC011-091-142330-
/O.NEW.KPHI.SV.W.0128.050814T2246Z-050814T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
646 PM EDT SUN AUG 14 2005

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA
  NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA

* UNTIL 730 PM EDT

* AT 643 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED 7 MILES NORTHEAST OF
  BIRDSBORO...OR ABOUT 9 MILES EAST OF READING...AND MOVING EAST AT
  20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  POTTSTOWN BY 700 PM EDT
  GILBERTSVILLE BY 705 PM EDT
  EAST GREENVILLE BY 720 PM EDT
  SPRING MOUNT BY 725 PM EDT

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 4045 7575 4025 7582 4022 7524 4036 7540
      4043 7557

$$

EBERWINE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 3:41 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	34 min
Aug 14, 6:55 PM EDT	Severe Thunderstorm Warning	PHI	Chester	50 min
Aug 14, 6:59 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	46 min
Aug 14, 7:52 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery	23 min
Aug 14, 7:57 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	33 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2005 Every severe thunderstorm warning in 2005

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.