Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 78, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 15, 2009, 5:55 PM EDT for Delaware County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 65 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 15, 2009, 5:55 PM EDT (21:55 UTC)
- Expired
- Jun 15, 2009, 7:00 PM EDT
- In force
- 65 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 65 km from the middle of the area, began a volume at 21:55 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 15, 6:05 PM EDT | HAIL 0.25 | Roxborough, PA | PEA SIZE HAIL REPORTED IN THE ROXBOROUGH SECTION OF PHILADELPHIA. |
| Jun 15, 6:08 PM EDT | TSTM WND DMG | Nw Roxborough, PA | TREE REPORTED DOWN ON NIXON AVENUE. |
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, 9.9 hours before the alert went out and 97 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
- 196 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 943 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 152155
SVRPHI
PAC045-091-101-152300-
/O.NEW.KPHI.SV.W.0078.090615T2155Z-090615T2300Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
555 PM EDT MON JUN 15 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF PHILADELPHIA...
* UNTIL 700 PM EDT
* AT 551 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
DAMAGING WINDS UP TO 60 MPH. THIS STORM WAS LOCATED NEAR
CHESTNUT HILL...OR 8 MILES SOUTHWEST OF WILLOW GROVE...AND
MOVING SOUTHEAST AT 20 MPH.
THIS STORM HAS A LONG HISTORY OF PRODUCING LARGE HAIL AND STRONG
WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS
* THE SEVERE THUNDERSTORM WILL BE NEAR...
CHESTNUT HILL AND BRYN MAWR AROUND 600 PM EDT...
GERMANTOWN AROUND 605 PM EDT...
ROXBOROUGH AROUND 610 PM EDT...
TEMPLE UNIVERSITY...KENSINGTON...PHILADELPHIA AND YEADON AROUND 620
PM EDT...
CENTER CITY AROUND 625 PM EDT...
SOUTH PHILADELPHIA AROUND 630 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT 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 4000 7506 3998 7511 3995 7515 3989 7514
3987 7520 3985 7526 4007 7537 4012 7517
TIME...MOT...LOC 2153Z 330DEG 16KT 4009 7525
$$
GORSE/DEFINO1 follow-up statement
000
WWUS51 KPHI 152222
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
622 PM EDT MON JUN 15 2009
PAC045-101-152300-
/O.CON.KPHI.SV.W.0078.000000T0000Z-090615T2300Z/
DELAWARE PA-PHILADELPHIA PA-
622 PM EDT MON JUN 15 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SOUTHERN PHILADELPHIA AND EAST CENTRAL DELAWARE COUNTIES...
AT 619 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE
HAIL...AND DAMAGING WINDS UP TO 60 MPH. THIS STORM WAS LOCATED NEAR
TEMPLE UNIVERSITY...OR NEAR PHILADELPHIA...MOVING SOUTHEAST AT 20
MPH.
THIS STORM HAS HAD A LONG HISTORY OF PRODUCING LARGE HAIL AND STRONG
WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS
THE SEVERE THUNDERSTORM WILL BE NEAR...
SOUTH PHILADELPHIA AND 6 MILES NORTHEAST OF PHILADELPHIA
INTERNATIONAL AIRPORT BY 630 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CLOUD TO GROUND
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY
LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU
CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.
&&
LAT...LON 3989 7514 3987 7521 3986 7525 3986 7527
3997 7531 4005 7513 4000 7506 3998 7511
3995 7515
TIME...MOT...LOC 2221Z 330DEG 16KT 3996 7519
$$
GORSE/DEFINOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 2:33 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 57 min |
| Jun 15, 3:16 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Northampton | 59 min |
| Jun 15, 4:15 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 60 min |
| Jun 15, 5:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 62 min |
| Jun 15, 6:37 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 53 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2009Every severe thunderstorm warning in 2009
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.