Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 16, NWS Philadelphia/Mount Holly

May 14, 2010Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 14, 2010, 4:42 PM EDT for Berks County, Pennsylvania. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 14, 2010, 4:42 PM EDT (20:42 UTC)
Expired
May 14, 2010, 5:45 PM EDT
In force
63 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 160 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 14, 3:43 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 114 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 2010-05-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2010-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.19395878Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
557 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
187 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

773 
WUUS51 KPHI 142042
SVRPHI
PAC011-142145-
/O.NEW.KPHI.SV.W.0016.100514T2042Z-100514T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
442 PM EDT FRI MAY 14 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF READING...

* UNTIL 545 PM EDT

* AT 438 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 33
  MILES WEST OF STRAUSSTOWN...OR 44 MILES NORTHWEST OF LANCASTER...
  AND MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  STRAUSSTOWN AROUND 535 PM EDT...
  BERNVILLE AROUND 540 PM EDT...
  SHOEMAKERSVILLE...HAMBURG AND LEESPORT AROUND 545 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4053 7634 4052 7630 4054 7618 4060 7605
      4059 7603 4064 7600 4066 7595 4067 7588
      4019 7592 4022 7603 4036 7621 4036 7624
      4047 7640 4050 7644
TIME...MOT...LOC 2042Z 274DEG 31KT 4054 7677

$$

HAYES
2 follow-up statements
340 
WWUS51 KPHI 142105
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
505 PM EDT FRI MAY 14 2010

PAC011-142145-
/O.CON.KPHI.SV.W.0016.000000T0000Z-100514T2145Z/
BERKS PA-
505 PM EDT FRI MAY 14 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR WESTERN BERKS COUNTY...

AT 503 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 18 MILES WEST OF STRAUSSTOWN...OR 34 MILES NORTHWEST OF
READING...MOVING EAST AT 40 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  STRAUSSTOWN BY 530 PM EDT...
  9 MILES NORTH OF WOMELSDORF BY 535 PM EDT...
  BERNVILLE BY 540 PM EDT...
  CENTERPORT...SHOEMAKERSVILLE...LEESPORT AND 6 MILES SOUTHWEST OF
  HAMBURG BY 545 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4053 7634 4052 7630 4054 7618 4060 7605
      4059 7603 4064 7600 4066 7595 4067 7588
      4019 7592 4022 7603 4036 7621 4036 7624
      4047 7640 4050 7644
TIME...MOT...LOC 2105Z 276DEG 33KT 4052 7650

$$

HAYES
671 
WWUS51 KPHI 142143
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
543 PM EDT FRI MAY 14 2010

PAC011-142154-
/O.EXP.KPHI.SV.W.0016.000000T0000Z-100514T2145Z/
BERKS PA-
543 PM EDT FRI MAY 14 2010

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN BERKS COUNTY WILL
EXPIRE AT 545 PM EDT...

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

LAT...LON 4053 7634 4052 7630 4054 7618 4060 7605
      4059 7603 4064 7600 4066 7595 4067 7588
      4019 7592 4022 7603 4036 7621 4036 7624
      4047 7640 4050 7644
TIME...MOT...LOC 2144Z 276DEG 33KT 4048 7603

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
May 14, 3:52 PM EDTSpecial Weather StatementPHICarbon, Monroe53 min
May 14, 4:18 PM EDTSpecial Weather StatementPHICarbon57 min
May 14, 4:26 PM EDTSpecial Weather StatementPHICarbon, Northampton64 min
May 14, 5:04 PM EDTSevere Thunderstorm WarningPHIBucks, Lehigh, Northampton56 min
May 14, 5:07 PM EDTSpecial Weather StatementPHINorthampton53 min
May 14, 5:38 PM EDTTornado WarningPHIBerks, Lehigh37 min
May 14, 5:49 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery56 min
May 14, 5:53 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Northampton67 min
May 14, 6:11 PM EDTSpecial Weather StatementPHICarbon64 min
May 14, 6:25 PM EDTSevere Thunderstorm WarningPHIBucks, Chester, Montgomery, Philadelphia65 min
May 14, 6:35 PM EDTSevere Thunderstorm WarningPHIChester, Delaware55 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.