Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 212, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 8, 2012, 2:40 PM EDT for 6 counties in Pennsylvania. It was in force for 65 min. 6 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
- Sep 8, 2012, 2:40 PM EDT (18:40 UTC)
- Expired
- Sep 8, 2012, 3:45 PM EDT
- In force
- 65 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 125 km from the middle of the area, began a volume at 18:40 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 |
|---|---|---|---|
| Sep 8, 3:00 PM EDT | TSTM WND GST 53 | Reading Airport, PA | 53 MPH WIND GUST AT READING AIRPORT. |
| Sep 8, 3:05 PM EDT | TSTM WND DMG | Reading, PA | LARGE TREE LIMBS DOWN IN READING. |
| Sep 8, 3:20 PM EDT | TSTM WND DMG | Blandon, PA | TREES DOWN IN BLANDON. |
| Sep 8, 3:41 PM EDT | TSTM WND DMG | Upper Saucon Twp, PA | NUMEROUS TREES AND POWER LINES DOWN ACROSS SOUTHEASTERN LEHIGH COUNTY... INCLUDING IN UPPER SAUCON TWP... UPPER MILFORD TWP... AND IN COOPERSBURG. SOME TREES DOWN ONTO HOUSES. |
| Sep 8, 3:48 PM EDT | TSTM WND DMG | Coopersburg, PA | TREES AND A POWER LINE DOWN IN COOPERSBURG. |
| Sep 8, 3:50 PM EDT | TSTM WND DMG | Springtown, PA | TREE DOWN AT INTERSECTION OF OLD BETHLEHEM ROAD AND HILLTOP ROAD. |
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 |
|---|---|---|---|
| Sep 8, 12:15 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 6.7 hours before the alert went out and 207 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
- 252 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 638 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
242
WUUS51 KPHI 081840
SVRPHI
PAC011-017-029-077-091-095-081945-
/O.NEW.KPHI.SV.W.0212.120908T1840Z-120908T1945Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
240 PM EDT SAT SEP 8 2012
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
BERKS COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF READING...
LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF ALLENTOWN...
NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF EASTON...
NORTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 345 PM EDT
* AT 236 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
FROM HAMBURG TO 17 MILES WEST OF HONEY BROOK TO 41 MILES WEST OF
GLEN ROY...OR ALONG A LINE EXTENDING FROM 19 MILES NORTH OF READING
TO LANCASTER TO 19 MILES NORTHWEST OF BALTIMORE...AND MOVING EAST
AT 45 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
SINKING SPRING...SHOEMAKERSVILLE AND LEESPORT AROUND 245 PM EDT...
WANAMAKERS...WYOMISSING...READING AND LENHARTSVILLE AROUND 250 PM
EDT...
NEW TRIPOLI AND FLEETWOOD AROUND 255 PM EDT...
JORDAN VALLEY AROUND 300 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY 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 THESE STORMS. 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 1000 PM EDT
SATURDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.
&&
LAT...LON 4054 7621 4058 7602 4063 7601 4067 7595
4092 7511 4078 7515 4075 7519 4068 7520
4068 7518 4032 7529 3976 7592 3972 7605
3972 7613 3988 7600 3996 7600 4003 7594
4011 7595 4014 7589 4038 7626
TIME...MOT...LOC 1839Z 248DEG 41KT 4060 7600 4006 7618
3956 7673
$$
MPD1 follow-up statement
581
WWUS51 KPHI 081913
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
313 PM EDT SAT SEP 8 2012
PAC011-017-029-077-091-095-081945-
/O.CON.KPHI.SV.W.0212.000000T0000Z-120908T1945Z/
BERKS PA-BUCKS PA-LEHIGH PA-MONTGOMERY PA-NORTHAMPTON PA-CHESTER PA-
313 PM EDT SAT SEP 8 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR CHESTER...NORTHAMPTON...NORTHWESTERN MONTGOMERY...LEHIGH...
NORTHWESTERN BUCKS AND BERKS COUNTIES...
AT 306 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM NEW TRIPOLI TO ELVERSON TO 18 MILES WEST OF GLEN
ROY...OR ALONG A LINE EXTENDING FROM 9 MILES SOUTH OF LEHIGHTON TO 13
MILES SOUTHEAST OF READING TO 25 MILES SOUTH OF LANCASTER...MOVING
EAST AT 45 MPH.
READING AIRPORT REPORTED WIND GUSTS BETWEEN 50 AND 55 MPH AT 300 PM
WITH THE LINE OF STORMS.
SEVERE THUNDERSTORMS WILL BE NEAR...
PUGHTOWN...NEFFS...GLENMOORE AND COFFEETOWN BY 320 PM EDT...
ZIONSVILLE...MOUNT VERNON...HOMEVILLE AND NORTHAMPTON BY 325 PM
EDT...
GLEN ROY AND GERYVILLE BY 330 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 DAMAGING WINDS...FREQUENT CLOUD TO GROUND LIGHTNING
IS OCCURRING WITH THESE 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 1000 PM EDT
SATURDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.
&&
LAT...LON 3988 7600 4011 7595 4014 7589 4024 7605
4045 7610 4063 7600 4092 7511 4078 7515
4075 7519 4068 7518 4032 7529 3976 7592
3972 7613
TIME...MOT...LOC 1911Z 248DEG 41KT 4073 7571 4019 7574
3970 7629
$$
MPDThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 2:52 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 53 min |
| Sep 8, 3:45 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Monroe, Montgomery, Northampton | 60 min |
| Sep 8, 4:07 PM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 83 min |
| Sep 8, 4:29 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 61 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.