Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 7, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 10, 2013, 7:44 PM EDT for 5 counties in Pennsylvania. It was in force for 46 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
- Apr 10, 2013, 7:44 PM EDT (23:44 UTC)
- Expired
- Apr 10, 2013, 8:30 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 100 km from the middle of the area, began a volume at 23:45 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 |
|---|---|---|---|
| Apr 10, 7:50 PM EDT | TSTM WND DMG | 3 Ne Pottsgrove, PA | TREES AND WIRES DOWN |
| Apr 10, 8:15 PM EDT | TSTM WND DMG | Valley Green, PA | TREES AND WIRES 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, 11.7 hours before the alert went out and 91 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
- 1 J/kg
- Mixed-layer CIN
- -437 J/kg
- Mixed-layer LCL
- 1938 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 180 m²/s²
- 0-3 km storm-relative helicity
- 181 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
353
WUUS51 KPHI 102344
SVRPHI
PAC011-017-029-045-091-110030-
/O.NEW.KPHI.SV.W.0007.130410T2344Z-130411T0030Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
744 PM EDT WED APR 10 2013
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
SOUTHERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTH CENTRAL DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 830 PM EDT
* AT 740 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM GREEN LANE TO HONEY BROOK...OR
ALONG A LINE EXTENDING FROM 15 MILES SOUTH OF ALLENTOWN TO 9 MILES
EAST OF NEW HOLLAND...AND MOVING EAST AT 45 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
PERKASIE...SCHWENKSVILLE...PUGHTOWN AND GLENMOORE AROUND 750 PM
EDT...
TRAPPE...SOUDERTON...ROYERSFORD AND HATFIELD AROUND 755 PM EDT...
DUBLIN AND PHOENIXVILLE AROUND 800 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.
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.
&&
LAT...LON 4018 7595 4043 7546 4029 7486 4026 7485
4009 7523 3994 7540 4007 7594 4009 7595
4014 7589
TIME...MOT...LOC 2344Z 287DEG 40KT 4035 7543 4012 7587
$$
MPD2 follow-up statements
300
WWUS51 KPHI 102355
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
755 PM EDT WED APR 10 2013
PAC011-110006-
/O.CAN.KPHI.SV.W.0007.000000T0000Z-130411T0030Z/
BERKS PA-
755 PM EDT WED APR 10 2013
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS COUNTY IS
CANCELLED...
LAT...LON 4021 7574 4041 7536 4029 7486 4026 7485
4009 7523 3994 7540 4004 7579
TIME...MOT...LOC 2356Z 287DEG 40KT 4031 7526 4008 7570
$$
PAC017-029-045-091-110030-
/O.CON.KPHI.SV.W.0007.000000T0000Z-130411T0030Z/
BUCKS PA-MONTGOMERY PA-DELAWARE PA-CHESTER PA-
755 PM EDT WED APR 10 2013
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHEASTERN CHESTER...NORTH CENTRAL DELAWARE...MONTGOMERY AND
SOUTHERN BUCKS COUNTIES...
AT 753 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM SOUDERTON TO GLENMOORE...OR
ALONG A LINE EXTENDING FROM 21 MILES SOUTHEAST OF ALLENTOWN TO 12
MILES NORTHWEST OF WEST CHESTER...MOVING EAST AT 45 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
DOYLESTOWN...ROBESONIA...TROOPER AND NORTH WALES BY 805 PM EDT...
SPRING HOUSE...PAOLI...MALVERN AND KING OF PRUSSIA BY 810 PM EDT...
NEWTOWN GRANT AND WEST CONSHOHOCKEN BY 815 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! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.
&&
LAT...LON 4021 7574 4041 7536 4029 7486 4026 7485
4009 7523 3994 7540 4004 7579
TIME...MOT...LOC 2356Z 287DEG 40KT 4031 7526 4008 7570
$$
MPD984
WWUS51 KPHI 110025
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
825 PM EDT WED APR 10 2013
PAC029-110034-
/O.CAN.KPHI.SV.W.0007.000000T0000Z-130411T0030Z/
CHESTER PA-
825 PM EDT WED APR 10 2013
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHESTER COUNTY IS
CANCELLED...
LAT...LON 4010 7521 3995 7540 4002 7543 4002 7541
4005 7540 4007 7536 4007 7537 4006 7540
4009 7543 4009 7544 4022 7537 4034 7504
4029 7486 4026 7485
TIME...MOT...LOC 0024Z 287DEG 40KT 4022 7487 3999 7531
$$
PAC017-045-091-110030-
/O.CON.KPHI.SV.W.0007.000000T0000Z-130411T0030Z/
BUCKS PA-MONTGOMERY PA-DELAWARE PA-
825 PM EDT WED APR 10 2013
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTH CENTRAL DELAWARE...SOUTHEASTERN MONTGOMERY AND CENTRAL
BUCKS COUNTIES...
AT 819 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 15 MILES WEST OF TRENTON TO 8
MILES EAST OF WEST CHESTER...MOVING EAST AT 45 MPH.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO DAMAGING WINDS...FREQUENT CLOUD TO GROUND
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY!
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
&&
LAT...LON 4010 7521 3995 7540 4002 7543 4002 7541
4005 7540 4007 7536 4007 7537 4006 7540
4009 7543 4009 7544 4022 7537 4034 7504
4029 7486 4026 7485
TIME...MOT...LOC 0024Z 287DEG 40KT 4022 7487 3999 7531
$$
MPDThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 4:53 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 112 min |
| Apr 10, 5:25 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 65 min |
| Apr 10, 6:21 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Northampton | 54 min |
| Apr 10, 6:56 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 49 min |
| Apr 10, 7:41 PM EDT | Special Weather Statement | PHI | Bucks, Chester, Montgomery | 64 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2013Every severe thunderstorm warning in 2013
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.