Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 131, NWS Philadelphia/Mount Holly

August 14, 2005Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 14, 2005, 7:52 PM EDT for Montgomery County, Pennsylvania. It was in force for 23 min. 1 report 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, 7:52 PM EDT (23:52 UTC)
Expired: Aug 14, 2005, 8:15 PM EDT
In force: 23 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 83 km from the middle of the area, began a volume at 23:52 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, 8:00 PM EDT	HAIL 0.25	Collegeville, PA	PEA SIZE HAIL REPORTED IN COLLEGVILLE AND TRAPPE.

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

Brookhaven, NY (KOKX), launched 12:00Z, 11.9 hours before the alert went out and 220 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: 1871 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 901 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 142352
SVRPHI
PAC091-150015-
/O.NEW.KPHI.SV.W.0131.050814T2352Z-050815T0015Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 815 PM EDT

* AT 748 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 LANSDALE TO COLLEGEVILLE...OR ALONG A LINE EXTENDING FROM 22
  MILES SOUTH OF ALLENTOWN TO 23 MILES NORTHWEST OF PHILADELPHIA...
  AND MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  LANSDALE AND KING OF PRUSSIA BY 805 PM EDT
  NORRISTOWN BY 810 PM EDT
  AMBLER...PLYMOUTH MEETING AND WILLOW GROVE BY 815 PM EDT

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS

LAT...LON 4032 7534 4020 7555 4004 7532 4014 7507

$$

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, 6:46 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Montgomery	44 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, 7:57 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.