Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 36, NWS Philadelphia/Mount Holly

May 27, 2014Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 27, 2014, 4:47 PM EDT for Berks County, Pennsylvania. It was in force for 43 min. 4 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 27, 2014, 4:47 PM EDT (20:47 UTC)
Expired: May 27, 2014, 5:30 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 136 km from the middle of the area, began a volume at 20:49 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 27, 4:56 PM EDT	TSTM WND DMG	Reading, PA	A LARGE TREE SNAPPED AT THE BASE AND LANDED ON A CAR ON OLEY STREET. SEVERAL WIRES WERE ALSO PULLED DOWN WITH IT. A UTILITY POLE WAS SNAPPED IN HALF LESS THAN A BLOCK AWAY.
May 27, 4:56 PM EDT	TSTM WND GST 54	Reading Airport, PA
May 27, 5:00 PM EDT	TSTM WND DMG	N Reading, PA	SEVERAL TREES AND WIRES DOWN.
May 27, 5:00 PM EDT	TSTM WND DMG	Reading, PA	TWITTER PICTURE OF A VERY LARGE BRANCH DOWN ON OLEY STREET.

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
May 27, 2:13 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.8 hours before the alert went out and 101 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1885 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 94 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.

796 
WUUS51 KPHI 272047
SVRPHI
PAC011-272130-
/O.NEW.KPHI.SV.W.0036.140527T2047Z-140527T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
447 PM EDT TUE MAY 27 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN BERKS COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 530 PM EDT

* AT 446 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR NEWMANSTOWN...MOVING EAST
  AT 40 MPH. THIS STORM IS CAPABLE OF PRODUCING ONE INCH DIAMETER
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WERNERSVILLE AND BERNVILLE AROUND 455 PM EDT...
  SINKING SPRING AND FAIRVIEW HGTS AROUND 500 PM EDT...
  WYOMISSING AND LEESPORT AROUND 505 PM EDT...
  READING AND LAURELDALE AROUND 510 PM EDT...
  BIRDSBORO AND FLEETWOOD AROUND 515 PM EDT...
  BECHTELSVILLE AND BALLY AROUND 530 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS SEVERE
THUNDERSTORM. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...IF YOU
CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHEASTERN MARYLAND AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4047 7556 4045 7553 4026 7568 4021 7576
      4021 7600 4036 7621 4036 7623 4040 7629
      4044 7633
TIME...MOT...LOC 2047Z 270DEG 37KT 4035 7621

$$

FORECASTER: HEAVENER

1 follow-up statement

148 
WWUS51 KPHI 272116
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
516 PM EDT TUE MAY 27 2014

PAC011-272130-
/O.CON.KPHI.SV.W.0036.000000T0000Z-140527T2130Z/
BERKS PA-
516 PM EDT TUE MAY 27 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHEASTERN BERKS COUNTY...

AT 512 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR ST. LAWRENCE...OR NEAR
READING...MOVING EAST AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  AMITY GARDENS BY 520 PM EDT...
  BOYERTOWN...BECHTELSVILLE AND BALLY BY 530 PM EDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHEASTERN MARYLAND AND EASTERN PENNSYLVANIA.

LAT...LON 4045 7595 4047 7556 4045 7553 4026 7568
      4021 7576 4021 7600 4030 7612
TIME...MOT...LOC 2115Z 270DEG 37KT 4035 7583

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 4:33 PM EDT	Special Weather Statement	PHI	Berks	57 min
May 27, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery	67 min
May 27, 5:24 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	66 min
May 27, 5:52 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	53 min
May 27, 6:19 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	3 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014 Every severe thunderstorm warning in 2014

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.