Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 115, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 22, 2011, 2:53 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 67 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
- Jun 22, 2011, 2:53 PM EDT (18:53 UTC)
- Expired
- Jun 22, 2011, 4:00 PM EDT
- In force
- 67 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Bucks County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 18:55 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 22, 3:12 PM EDT | TSTM WND DMG | Lansdale, PA | WIRES DOWN IN LANSDALE |
| Jun 22, 3:29 PM EDT | TSTM WND DMG | Horsham, PA | TREES DOWN IN HORSHAM |
| Jun 22, 3:30 PM EDT | TSTM WND DMG | Warrington, PA | THREE AREAS IN WARRINGTON WITH TREES DOWN |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.9 hours before the alert went out and 117 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.
- Mixed-layer CAPE
- 356 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 887 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
261
WUUS51 KPHI 221853
SVRPHI
PAC017-091-101-222000-
/O.NEW.KPHI.SV.W.0115.110622T1853Z-110622T2000Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
253 PM EDT WED JUN 22 2011
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...
NORTHERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 400 PM EDT
* AT 251 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
COLLEGEVILLE...OR 20 MILES NORTHEAST OF WEST CHESTER...AND MOVING
EAST AT 25 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
LANSDALE...HATFIELD AND SOUDERTON AROUND 310 PM EDT...
FRICKS AROUND 320 PM EDT...
CHALFONT AROUND 325 PM EDT...
DOYLESTOWN AND HATBORO AROUND 335 PM EDT...
IVYLAND AROUND 340 PM EDT...
RICHBORO AROUND 350 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CLOUD TO GROUND
LIGHTNING IS DEVELOPING WITH THIS STORM. MOVE INDOORS IMMEDIATELY!
LIGHTNING IS ONE OF NATURES GREATEST KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.
&&
LAT...LON 4012 7476 4012 7483 4007 7488 4006 7495
4003 7498 4009 7546 4013 7548 4013 7552
4016 7551 4015 7554 4031 7558 4048 7507
4042 7506 4040 7502 4040 7497 4034 7495
4015 7472
TIME...MOT...LOC 1853Z 259DEG 20KT 4021 7542
$$
MPD2 follow-up statements
802
WWUS51 KPHI 221919
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
319 PM EDT WED JUN 22 2011
PAC017-091-101-222000-
/O.CON.KPHI.SV.W.0115.000000T0000Z-110622T2000Z/
PHILADELPHIA PA-MONTGOMERY PA-BUCKS PA-
319 PM EDT WED JUN 22 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR BUCKS...EASTERN MONTGOMERY AND NORTHEASTERN PHILADELPHIA
COUNTIES...
AT 316 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO GOLF
BALL SIZE ...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR MONTGOMERYVILLE...OR 17 MILES NORTH OF
PHILADELPHIA...MOVING EAST AT 25 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
HORSHAM BY 325 PM EDT...
DOYLESTOWN AND WARMINSTER HEIGHTS BY 330 PM EDT...
IVYLAND BY 335 PM EDT...
RICHBORO AND CHURCHVILLE BY 345 PM EDT...
NEWTOWN GRANT AND VILLAGE SHIRES BY 350 PM EDT...
NEWTOWN AND NEW HOPE BY 355 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. THIS IS A DANGEROUS
STORM. MOVE INDOORS IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER
ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.
&&
LAT...LON 4012 7476 4012 7483 4007 7488 4006 7495
4003 7498 4012 7533 4036 7542 4048 7507
4042 7506 4040 7502 4040 7497 4034 7495
4015 7472
TIME...MOT...LOC 1918Z 259DEG 20KT 4025 7520
$$
GORSE447
WWUS51 KPHI 221946
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
346 PM EDT WED JUN 22 2011
PAC091-101-221954-
/O.CAN.KPHI.SV.W.0115.000000T0000Z-110622T2000Z/
PHILADELPHIA PA-MONTGOMERY PA-
346 PM EDT WED JUN 22 2011
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MONTGOMERY AND
NORTHEASTERN PHILADELPHIA COUNTIES IS CANCELLED...
THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS MOVED OUT OF
MONTGOMERY COUNTY AND INTO BUCKS COUNTY. THIS STORM IS EXPECTED TO
REMAIN NORTH OF PHILADELPHIA COUNTY. THEREFORE, THE WARNING HAS BEEN
CANCELLED.
LAT...LON 4015 7472 4021 7515 4042 7523 4048 7507
4042 7506 4040 7502 4040 7497 4034 7495
TIME...MOT...LOC 1944Z 262DEG 23KT 4027 7495
$$
PAC017-222000-
/O.CON.KPHI.SV.W.0115.000000T0000Z-110622T2000Z/
BUCKS PA-
346 PM EDT WED JUN 22 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR CENTRAL BUCKS COUNTY...
AT 342 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR NEWTOWN GRANT...OR 12 MILES WEST OF TRENTON...MOVING
EAST AT 25 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
WOODBOURNE BY 350 PM EDT...
WOODSIDE AND 7 MILES NORTH OF FAIRLESS HILLS BY 355 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 4015 7472 4021 7515 4042 7523 4048 7507
4042 7506 4040 7502 4040 7497 4034 7495
TIME...MOT...LOC 1944Z 262DEG 23KT 4027 7495
$$
GORSEThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 9:37 PM EDT | Areal Flood Advisory | PHI | Monroe | 116 min |
| Jun 22, 2:15 AM EDT | Special Weather Statement | PHI | Berks, Chester, Delaware | 60 min |
| Jun 22, 2:57 AM EDT | Special Weather Statement | PHI | Delaware | 63 min |
| Jun 22, 3:05 AM EDT | Areal Flood Advisory | PHI | Chester, Delaware | 115 min |
| Jun 22, 4:13 AM EDT | Special Weather Statement | PHI | Carbon | 92 min |
| Jun 22, 6:32 AM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 58 min |
| Jun 22, 8:00 AM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 60 min |
| Jun 22, 1:48 PM EDT | Special Weather Statement | PHI | Berks | 57 min |
| Jun 22, 4:09 PM EDT | Special Weather Statement | PHI | Monroe | 66 min |
| Jun 22, 4:37 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 53 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2011Every severe thunderstorm warning in 2011
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.