Alert archive / Pennsylvania / Tornado Warnings in 2015

Tornado Warning 8, NWS Philadelphia/Mount Holly

June 30, 2015Chester County, Delaware County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Jun 30, 2015, 3:22 PM EDT for Chester County, Delaware County, Montgomery County, Pennsylvania. It was in force for 23 min. 2 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: Jun 30, 2015, 3:22 PM EDT (19:22 UTC)
Expired: Jun 30, 2015, 3:45 PM EDT
In force: 23 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Chester County, PA, Delaware County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 94 km from the middle of the area, began a volume at 19:22 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
Jun 30, 3:34 PM EDT	TSTM WND DMG	3 S Phoenixville, PA	TREES AND WIRES REPORTED DOWN IN PHOENIXVILLE.
Jun 30, 3:34 PM EDT	TSTM WND DMG	Phoenixville, PA	TREES AND WIRES REPORTED DOWN IN PHOENIXVILLE.

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
Jun 30, 1:21 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.4 hours before the alert went out and 80 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: 600 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 728 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

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

205 
WFUS51 KPHI 301922
TORPHI
PAC029-045-091-301945-
/O.NEW.KPHI.TO.W.0008.150630T1922Z-150630T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
322 PM EDT TUE JUN 30 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  EAST CENTRAL CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTH CENTRAL MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 345 PM EDT
    
* AT 322 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED
  NEAR WEST CHESTER...AND MOVING EAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WEST CHESTER...NORRISTOWN...PHOENIXVILLE...WEST NORRITON...VALLEY
  FORGE...BRYN MAWR...KING OF PRUSSIA...RADNOR TOWNSHIP...TROUT
  LAKE...PAOLI...NEWTOWN SQUARE...LIONVILLE...LIONVILLE-MARCHWOOD...
  CHESTER SPRINGS...WEST GOSHEN...BRIDGEPORT...MALVERN...WEST
  CONSHOHOCKEN...EAGLEVILLE AND EXTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3994 7559 4007 7568 4018 7540 4001 7529
TIME...MOT...LOC 1922Z 247DEG 19KT 4000 7557 

$$

HEAVENER

1 follow-up statement

628 
WWUS51 KPHI 301936
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
336 PM EDT TUE JUN 30 2015

PAC029-045-091-301945-
/O.CON.KPHI.TO.W.0008.000000T0000Z-150630T1945Z/
DELAWARE PA-CHESTER PA-MONTGOMERY PA-
336 PM EDT TUE JUN 30 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM EDT FOR NORTH
CENTRAL DELAWARE...EAST CENTRAL CHESTER AND SOUTH CENTRAL MONTGOMERY
COUNTIES...
    
AT 335 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED OVER
PAOLI...OR 7 MILES NORTHEAST OF WEST CHESTER. THIS DANGEROUS STORM
WAS NEARLY STATIONARY.

LOCATIONS IMPACTED INCLUDE...
NORRISTOWN...PHOENIXVILLE...WEST NORRITON...VALLEY FORGE...RADNOR
TOWNSHIP...BRYN MAWR...KING OF PRUSSIA...PAOLI...BRIDGEPORT...
MALVERN...WEST CONSHOHOCKEN...EAGLEVILLE...DEVON-BERWYN...TROOPER...
CHESTERBROOK...AUDUBON AND ARDMORE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3999 7552 4010 7560 4018 7540 4001 7529
TIME...MOT...LOC 1935Z 247DEG 19KT 4003 7549 

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 10:01 AM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	4 hr
Jun 30, 12:37 PM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Jun 30, 12:47 PM EDT	Special Weather Statement	PHI	Berks	43 min
Jun 30, 1:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	52 min
Jun 30, 1:47 PM EDT	Special Weather Statement	PHI	Lehigh	43 min
Jun 30, 1:48 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Jun 30, 1:55 PM EDT	Special Weather Statement	PHI	Chester	50 min
Jun 30, 2:00 PM EDT	Tornado Warning	PHI	Berks, Chester	30 min
Jun 30, 2:05 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	55 min
Jun 30, 2:13 PM EDT	Tornado Warning	PHI	Lehigh	32 min
Jun 30, 2:19 PM EDT	Special Weather Statement	PHI	Chester	26 min
Jun 30, 2:26 PM EDT	Areal Flood Advisory	PHI	Berks, Chester	4 hr
Jun 30, 2:34 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	56 min
Jun 30, 2:41 PM EDT	Severe Thunderstorm Warning	PHI	Chester	49 min
Jun 30, 2:42 PM EDT	Tornado Warning	PHI	Lehigh, Northampton	33 min
Jun 30, 2:48 PM EDT	Special Weather Statement	PHI	Chester	57 min
Jun 30, 2:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	38 min
Jun 30, 2:55 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	4 hr
Jun 30, 3:00 PM EDT	Areal Flood Advisory	PHI	Bucks, Monroe, Northampton	4 hr
Jun 30, 3:00 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	60 min
Jun 30, 3:08 PM EDT	Areal Flood Advisory	PHI	Chester	4 hr
Jun 30, 3:25 PM EDT	Severe Thunderstorm Warning	PHI	Chester	37 min
Jun 30, 3:31 PM EDT	Special Weather Statement	PHI	Lehigh	44 min
Jun 30, 3:37 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	4 hr
Jun 30, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Philadelphia	47 min
Jun 30, 3:45 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	45 min
Jun 30, 3:47 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	43 min
Jun 30, 3:54 PM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	13 hr
Jun 30, 3:57 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Jun 30, 4:22 PM EDT	Special Weather Statement	PHI	Monroe	23 min
Jun 30, 4:29 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	31 min
Jun 30, 4:31 PM EDT	Special Weather Statement	PHI	Carbon	29 min
Jun 30, 4:58 PM EDT	Areal Flood Advisory	PHI	Delaware, Montgomery, Philadelphia	3 hr
Jun 30, 4:59 PM EDT	Special Weather Statement	PHI	Philadelphia	61 min
Jun 30, 5:03 PM EDT	Special Weather Statement	PHI	Monroe	27 min
Jun 30, 5:51 PM EDT	Special Weather Statement	PHI	Monroe	24 min
Jun 30, 6:03 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	11 hr
Jun 30, 6:28 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	47 min
Jun 30, 7:13 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	62 min

Nearby

Tornado Warnings in Pennsylvania, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.