Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 92, NWS Philadelphia/Mount Holly

July 27, 2005Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 27, 2005, 6:30 PM EDT for Philadelphia County, Pennsylvania. It was in force for 45 min. 5 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 27, 2005, 6:30 PM EDT (22:30 UTC)
Expired: Jul 27, 2005, 7:15 PM EDT
In force: 45 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 63 km from the middle of the area, began a volume at 22:31 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 27, 6:33 PM EDT	TSTM WND DMG	1 Nw Philadelphia, PA	TREE LIMBS DOWNED IN ROXBOROUGH.
Jul 27, 6:33 PM EDT	TSTM WND DMG	Philadelphia, PA	NUMEROUS TREES WERE KNOCKED DOWN IN THE NORTHWEST AND NORTHEAST SECTIONS OF PHILADELPHIA. POWER OUTAGES WERE ALSO REPORTED.
Jul 27, 6:33 PM EDT	TSTM WND GST 63	1 Nw Philadelphia, PA	A 63 MPH WIND GUST WAS MEASURED BY A WEATHER SPOTTER IN ROXBOROUGH.
Jul 27, 6:33 PM EDT	TSTM WND GST 63	1 Nw Philadelphia, PA	A 63 MPH WIND GUST WAS MEASURED BY A WEATHER SPOTTER IN ROXBOROUGH.
Jul 27, 6:33 PM EDT	TSTM WND GST 63	2 Nw Philadelphia, PA	A 63 MPH WIND GUST WAS MEASURED BY A WEATHER SPOTTER IN ROXBOROUGH.

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 27, 1:50 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.5 hours before the alert went out and 105 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: 1105 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1506 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 29 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 272231
SVRPHI
PAC101-272315-
/O.NEW.KPHI.SV.W.0092.050727T2230Z-050727T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
630 PM EDT WED JUL 27 2005

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA
  THIS INCLUDES THE CITY OF PHILADELPHIA

* UNTIL 715 PM EDT

* AT 627 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
  EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 17 MILES NORTHWEST OF
  PHILADELPHIA...AND MOVING SOUTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PHILADELPHIA BY 650 PM EDT

THIS IS A DANGEROUS STORM.  HEAVY RAIN...HAIL AND WIND GUSTS OVER 70 
MPH ARE POSSIBLE WITH THIS STORM.

LAT...LON 4008 7524 3986 7525 4007 7495 4013 7500
      4007 7513

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	39 min
Jul 27, 4:12 PM EDT	Severe Thunderstorm Warning	PHI	Berks	48 min
Jul 27, 4:30 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Northampton	45 min
Jul 27, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Berks	43 min
Jul 27, 5:47 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery	58 min
Jul 27, 6:34 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	56 min
Jul 27, 6:40 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery	35 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.