Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 104, NWS Philadelphia/Mount Holly

September 12, 20137 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 12, 2013, 4:40 PM EDT for 7 counties in Pennsylvania. It was in force for 95 min. 11 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 12, 2013, 4:40 PM EDT (20:40 UTC)
Expired
Sep 12, 2013, 6:15 PM EDT
In force
95 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Berks County, PA, Bucks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 128 km from the middle of the area, began a volume at 20:42 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

TimeReportWhereRemark
Sep 12, 4:40 PM EDTTSTM WND DMGTulpehocken Twp, PAONE TREE DOWN
Sep 12, 4:45 PM EDTTSTM WND DMGOley Twp, PAFEW TREES DOWN
Sep 12, 5:11 PM EDTTSTM WND GST 46Reading, PAREADING ASOS WIND
Sep 12, 5:11 PM EDTTSTM WND GST 46Reading Airport, PAA 46 MPH THUNDERSTORM WIND GUST AT THE READING AIRPORT.
Sep 12, 5:11 PM EDTTSTM WND GST 46Reading Airport, PAREADING ASOS WIND
Sep 12, 5:20 PM EDTTSTM WND DMGMuhlenberg Twp, PA*** 1 INJ *** TREE FELL ON HOUSE AND PERSON TRAPPED IN DEBRIS. TIME OF EVENT IS APPROXIMATE
Sep 12, 5:20 PM EDTTSTM WND DMGMuhlenberg Twp, PATREE FELL ON HOUSE AND PERSON TRAPPED IN DEBRIS. TIME OF EVENT IS APPROXIMATE
Sep 12, 5:25 PM EDTTSTM WND DMGWhitehall Twp, PATREES DOWN IN WHITEHALL AND SOME POWER LINES ARE LOWER BUT NOT QUITE ON GROUND.
Sep 12, 5:30 PM EDTTSTM WND DMGRockland Twp, PANUMEROUS TREES DOWN ACROSS SEVERAL LOCATIONS...LINES DOWN IN ROCKLAND.
Sep 12, 5:49 PM EDTTSTM WND GST 61Bushkill Twp, PAA 61 MPH THUNDERSTORM WIND GUST WAS MEASURED IN BUSHKILL TOWNSHIP. WINDS TOOK DOWN A LARGE PINE TREE IN A BACKYARD.
Sep 12, 6:00 PM EDTTSTM WND GST 47Forks Twp, PAFREQUENT LIGHTNING ALL AROUND...WIND GUST DIRECTION WAS SOUTHWEST

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.

IssuedProductOfficeLasted
Sep 12, 2:50 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.7 hours before the alert went out and 139 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.

Skew-T log-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2013-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1009 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2013-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1009 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
970 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
39 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

515 
WUUS51 KPHI 122040
SVRPHI
PAC011-017-025-077-089-091-095-122215-
/O.NEW.KPHI.SV.W.0104.130912T2040Z-130912T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
440 PM EDT THU SEP 12 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA...
  NORTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  SOUTHERN MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHERN CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 615 PM EDT

* AT 435 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  LOCUST LAKE STATE PARK TO STRAUSSTOWN TO CORNWALL...MOVING EAST AT
  40 MPH. THESE STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  STRAUSSTOWN AROUND 445 PM EDT...
  WOMELSDORF AND BERNVILLE AROUND 450 PM EDT...
  HAMBURG AROUND 455 PM EDT...
  NESQUEHONING AND WERNERSVILLE AROUND 500 PM EDT...
  LEHIGHTON AND JIM THORPE AROUND 505 PM EDT...
  WYOMISSING AND READING AROUND 510 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
THURSDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4052 7637 4052 7625 4058 7603 4065 7599
      4074 7577 4091 7600 4100 7512 4097 7514
      4087 7505 4085 7509 4080 7510 4075 7520
      4069 7520 4067 7518 4062 7520 4056 7517
      4033 7530 4023 7602 4049 7644
TIME...MOT...LOC 2040Z 263DEG 34KT 4079 7605 4047 7623
          4025 7634

$$

MEOLA
2 follow-up statements
849 
WWUS51 KPHI 122123
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
523 PM EDT THU SEP 12 2013

PAC011-017-025-077-089-091-095-122215-
/O.CON.KPHI.SV.W.0104.000000T0000Z-130912T2215Z/
BERKS PA-BUCKS PA-LEHIGH PA-MONROE PA-MONTGOMERY PA-CARBON PA-
NORTHAMPTON PA-
523 PM EDT THU SEP 12 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHAMPTON...SOUTHERN CARBON...NORTHWESTERN MONTGOMERY...
SOUTHERN MONROE...LEHIGH...NORTHWESTERN BUCKS AND BERKS COUNTIES...

AT 519 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 JIM THORPE TO MOHNTON...MOVING EAST AT 30 MPH.

TREES HAVE BEEN REPORTED DOWN DUE TO THUNDERSTORM WINDS IN OLEY AND 
TULPEHOCKEN TOWNSHIPS IN BERKS COUNTY.

SEVERE THUNDERSTORMS WILL BE NEAR...
NEW TRIPOLI AND PARRYVILLE AROUND 530 PM EDT...
ST. LAWRENCE AND REIFFTON AROUND 535 PM EDT...
LYONS AND SCHNECKSVILLE AROUND 540 PM EDT...
EFFORT AND GILBERT AROUND 545 PM EDT...
BRODHEADSVILLE AND ANCIENT OAKS AROUND 550 PM EDT...
NORTH CATASAUQUA AND MACUNGIE AROUND 555 PM EDT...

LAT...LON 4064 7600 4074 7577 4084 7590 4093 7586
      4100 7512 4097 7514 4087 7505 4085 7509
      4080 7510 4075 7520 4069 7520 4067 7518
      4062 7520 4056 7517 4033 7530 4023 7602
      4026 7608 4029 7612 4033 7618
TIME...MOT...LOC 2121Z 267DEG 27KT 4093 7568 4026 7603

$$

FORECASTER: AMC
193 
WWUS51 KPHI 122208
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
608 PM EDT THU SEP 12 2013

PAC011-017-025-077-089-091-095-122217-
/O.EXP.KPHI.SV.W.0104.000000T0000Z-130912T2215Z/
BERKS PA-BUCKS PA-LEHIGH PA-MONROE PA-MONTGOMERY PA-CARBON PA-
NORTHAMPTON PA-
608 PM EDT THU SEP 12 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHAMPTON...SOUTHERN
CARBON...NORTHWESTERN MONTGOMERY...SOUTHERN MONROE...LEHIGH...
NORTHWESTERN BUCKS AND BERKS COUNTIES WILL EXPIRE AT 615 PM EDT...

THE SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE. THE 
STORMS THAT PROMPTED THE WARNING WILL BE OUT OF THE AREA BY THAT 
TIME.

LAT...LON 4064 7600 4074 7577 4084 7590 4093 7586
      4100 7512 4097 7514 4087 7505 4085 7509
      4080 7510 4075 7520 4069 7520 4067 7518
      4062 7520 4056 7517 4033 7530 4023 7602
      4026 7608 4029 7612 4033 7618
TIME...MOT...LOC 2207Z 267DEG 27KT 4095 7522 4028 7558

$$

FORECASTER:  AMC

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 12, 7:38 AM EDTAreal Flood AdvisoryPHIBucks3 hr
Sep 12, 2:26 PM EDTSpecial Weather StatementPHICarbon, Monroe64 min
Sep 12, 3:43 PM EDTSpecial Weather StatementPHIBerks62 min
Sep 12, 4:21 PM EDTSpecial Weather StatementPHIBerks, Carbon, Lehigh, Monroe, Northampton84 min
Sep 12, 5:47 PM EDTSevere Thunderstorm WarningPHIChester, Delaware58 min
Sep 12, 6:07 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton68 min
Sep 12, 6:43 PM EDTSpecial Weather StatementPHIPhiladelphia62 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.