Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 128, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 26, 2012, 6:46 PM EDT for 6 counties in Pennsylvania. It was in force for 89 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
- Jul 26, 2012, 6:46 PM EDT (22:46 UTC)
- Expired
- Jul 26, 2012, 8:15 PM EDT
- In force
- 89 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, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 99 km from the middle of the area, began a volume at 22:47 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 26, 7:04 PM EDT | TSTM WND GST 64 | Elverson, PA | |
| Jul 26, 7:30 PM EDT | TSTM WND GST 50 | Oreland, PA |
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 26, 3:57 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.8 hours before the alert went out and 76 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
- 59 J/kg
- Mixed-layer CIN
- -282 J/kg
- Mixed-layer LCL
- 1017 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 238 m²/s²
- 0-3 km storm-relative helicity
- 239 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
648
WUUS51 KPHI 262246
SVRPHI
PAC011-017-029-045-091-101-270015-
/O.NEW.KPHI.SV.W.0128.120726T2246Z-120727T0015Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
646 PM EDT THU JUL 26 2012
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...
CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF WEST CHESTER...
DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF PHILADELPHIA...
* UNTIL 815 PM EDT
* AT 645 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
ACROSS WESTERN BERKS COUNTY...AND MOVING EAST AT 55 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
MOUNT VERNON...GLEN ROY...NEW MORGAN AND HONEY BROOK AROUND 655 PM
EDT...
HOMEVILLE...COCHRANVILLE...PARKESBURG AND OXFORD AROUND 700 PM
EDT...
WEST GROVE AND COATESVILLE AROUND 705 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DOPPLER RADAR HAS INDICATED SOME ROTATION WITHIN THIS STORM. WHILE
NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO IS
SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.
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.
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
THURSDAY EVENING FOR EASTERN PENNSYLVANIA.
&&
LAT...LON 3972 7614 3987 7600 4011 7594 4013 7589
4026 7606 4025 7572 4045 7556 4042 7548
4044 7546 4037 7496 4016 7472 3997 7511
3989 7513 3986 7523 3985 7533 3980 7541
3984 7553 3983 7563 3981 7570 3972 7578
TIME...MOT...LOC 2245Z 285DEG 53KT 4055 7569 4018 7613
$$
IOVINO1 follow-up statement
955
WWUS51 KPHI 262340
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
740 PM EDT THU JUL 26 2012
PAC011-262349-
/O.CAN.KPHI.SV.W.0128.000000T0000Z-120727T0015Z/
BERKS PA-
740 PM EDT THU JUL 26 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS COUNTY IS
CANCELLED...
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
LAT...LON 3974 7610 3988 7600 4011 7594 4041 7521
4037 7496 4016 7472 3997 7512 3989 7514
3985 7533 3980 7541 3983 7549 3984 7560
3981 7570 3972 7578 3972 7614
TIME...MOT...LOC 2339Z 285DEG 53KT 4027 7488 3990 7532
$$
PAC017-029-045-091-101-270015-
/O.CON.KPHI.SV.W.0128.000000T0000Z-120727T0015Z/
BUCKS PA-MONTGOMERY PA-PHILADELPHIA PA-DELAWARE PA-CHESTER PA-
740 PM EDT THU JUL 26 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR CHESTER...DELAWARE...PHILADELPHIA...MONTGOMERY AND SOUTHERN BUCKS
COUNTIES...
AT 735 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 NEW HOPE TO KING OF PRUSSIA
TO COATESVILLE...MOVING EAST AT 55 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
WISSINOMING...TACONY...SOUTH PHILADELPHIA AND PHILADELPHIA
INTERNATIONAL AIRPORT BY 745 PM EDT...
TULLYTOWN...CROYDON AND BRISTOL BY 750 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
THURSDAY EVENING FOR EASTERN PENNSYLVANIA.
&&
LAT...LON 3974 7610 3988 7600 4011 7594 4041 7521
4037 7496 4016 7472 3997 7512 3989 7514
3985 7533 3980 7541 3983 7549 3984 7560
3981 7570 3972 7578 3972 7614
TIME...MOT...LOC 2339Z 285DEG 53KT 4027 7488 3990 7532
$$
IOVINOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 7:41 AM EDT | Special Weather Statement | PHI | Carbon, Lehigh, Monroe, Northampton | 64 min |
| Jul 26, 5:21 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 54 min |
| Jul 26, 5:46 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Northampton | 74 min |
| Jul 26, 6:03 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 42 min |
| Jul 26, 6:10 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Northampton | 95 min |
| Jul 26, 6:22 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 83 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2012Every severe thunderstorm warning in 2012
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.