Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 71, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 26, 2011, 8:50 PM EDT for Berks County, Lehigh County, Northampton County, Pennsylvania. It was in force for 55 min. 5 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
- May 26, 2011, 8:50 PM EDT (00:50 UTC)
- Expired
- May 26, 2011, 9:45 PM EDT
- In force
- 55 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 128 km from the middle of the area, began a volume at 00:51 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 |
|---|---|---|---|
| May 26, 8:50 PM EDT | TSTM WND DMG | Maiden Creek, PA | LIMBS DOWN. POWER POLE DAMAGED. |
| May 26, 9:00 PM EDT | TSTM WND DMG | 3 S Kutztown, PA | SEVERAL DOWNED TREES AND BRANCHES |
| May 26, 9:00 PM EDT | TSTM WND DMG | Albany Twp, PA | SIDE OF UNUSED BARN BLOWN OUT... TWO ROOFS DAMAGED... TREES AND POWER LINES DOWN. |
| May 26, 9:00 PM EDT | TSTM WND GST 61 | Topton, PA | |
| May 26, 9:13 PM EDT | HAIL 1 | Lehigh Twp, PA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.8 hours before the alert went out and 226 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
- 935 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 1937 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 185 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.9
The text
As transmitted, in the capitals the NWS used until 2016.
463
WUUS51 KPHI 270050
SVRPHI
PAC011-077-095-270145-
/O.NEW.KPHI.SV.W.0071.110527T0050Z-110527T0145Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
850 PM EDT THU MAY 26 2011
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF READING...
LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF ALLENTOWN...
SOUTHWESTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
* UNTIL 945 PM EDT
* AT 847 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
KUTZTOWN...OR 14 MILES NORTH OF READING...AND MOVING EAST AT 45
MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
TOPTON AROUND 855 PM EDT...
CLAUSSVILLE AND ANCIENT OAKS AROUND 900 PM EDT...
COFFEETOWN AROUND 905 PM EDT...
ALLENTOWN AND NORTHAMPTON AROUND 910 PM EDT...
BETHLEHEM AND BATH AROUND 915 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.
&&
LAT...LON 4056 7610 4084 7537 4059 7526 4043 7557
4016 7591
TIME...MOT...LOC 0050Z 248DEG 48KT 4053 7580
$$
NIERENBERG1 follow-up statement
413
WWUS51 KPHI 270112
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
912 PM EDT THU MAY 26 2011
PAC011-270121-
/O.CAN.KPHI.SV.W.0071.000000T0000Z-110527T0145Z/
BERKS PA-
912 PM EDT THU MAY 26 2011
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BERKS COUNTY IS
CANCELLED...
THE THUNDERSTORMS HAVE MOVED OUT OF THE AREA.
LAT...LON 4071 7569 4084 7537 4059 7526 4053 7538
4051 7542 4045 7553
TIME...MOT...LOC 0111Z 248DEG 48KT 4063 7546
$$
PAC077-095-270145-
/O.CON.KPHI.SV.W.0071.000000T0000Z-110527T0145Z/
LEHIGH PA-NORTHAMPTON PA-
912 PM EDT THU MAY 26 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR WESTERN NORTHAMPTON AND EASTERN LEHIGH COUNTIES...
AT 908 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 FULLERTON...OR NEAR ALLENTOWN...MOVING EAST AT 55 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
7 MILES SOUTH OF CHAPMAN BY 915 PM EDT...
LAT...LON 4071 7569 4084 7537 4059 7526 4053 7538
4051 7542 4045 7553
TIME...MOT...LOC 0111Z 248DEG 48KT 4063 7546
$$
RPWThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 8:11 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 48 min |
| May 26, 8:46 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 59 min |
| May 26, 9:44 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 61 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.