Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 38, NWS Philadelphia/Mount Holly

May 27, 20144 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 27, 2014, 5:24 PM EDT for 4 counties in Pennsylvania. It was in force for 66 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 27, 2014, 5:24 PM EDT (21:24 UTC)
Expired: May 27, 2014, 6:30 PM EDT
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 101 km from the middle of the area, began a volume at 21:26 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, 5:30 PM EDT	TSTM WND GST 54	Skippack, PA
May 27, 6:00 PM EDT	TSTM WND DMG	East Rockhill Twp, PA	LARGE TREE DOWN AT SCHOOLHOUSE ROAD AND 3 MILE RUN ROAD. ESTIMATED WINDS OF 50 MPH. TIME ESTIMATED FROM RADAR.
May 27, 6:00 PM EDT	TSTM WND DMG	East Rockhill Twp, PA	LARGE TREE DOWN AT SCHOOLHOUSE ROAD AND 3 MILE RUN ROAD. TIME ESTIMATED FROM RADAR.
May 27, 6:00 PM EDT	TSTM WND DMG	Harleysville, PA	SEVERAL TREES DOWN. ONE ON A STRUCTURE.
May 27, 6:13 PM EDT	TSTM WND DMG	Chalfont, PA	TREE FELL ON POWER LINES

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, 9.4 hours before the alert went out and 103 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.

973 
WUUS51 KPHI 272124
SVRPHI
PAC011-017-077-091-272230-
/O.NEW.KPHI.SV.W.0038.140527T2124Z-140527T2230Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...
  WESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTH CENTRAL LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 630 PM EDT

* AT 519 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  ALBURTIS TO GILBERTSVILLE TO CEDARVILLE...MOVING EAST AT 15 MPH.
  THESE STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
  60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ZIONSVILLE AND EAST GREENVILLE AROUND 540 PM EDT...
  GREEN LANE AND GERYVILLE AROUND 545 PM EDT...
  SCHWENKSVILLE AROUND 555 PM EDT...
  TRAPPE AROUND 600 PM EDT...
  COLLEGEVILLE AROUND 605 PM EDT...
  QUAKERTOWN AROUND 610 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.

VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS LINE OF SEVERE
THUNDERSTORMS...WHICH COULD FLOOD LOW LYING AREAS QUICKLY AND COVER
ROADS WITH WATER. DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE
ROAD.

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

&&

LAT...LON 4051 7563 4043 7509 4027 7512 4008 7525
      4020 7555 4021 7556 4021 7558 4024 7560
      4022 7561 4024 7565 4024 7567 4029 7581
TIME...MOT...LOC 2123Z 278DEG 15KT 4045 7560 4033 7560
          4019 7570

$$

FORECASTER: HEAVENER

3 follow-up statements

261 
WWUS51 KPHI 272153
SVSPHI

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

PAC011-077-272203-
/O.CAN.KPHI.SV.W.0038.000000T0000Z-140527T2230Z/
BERKS PA-LEHIGH PA-
553 PM EDT TUE MAY 27 2014

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL LEHIGH AND EAST
CENTRAL BERKS COUNTIES IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHEASTERN MARYLAND AND EASTERN PENNSYLVANIA. A
SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT EDT
WEDNESDAY MORNING FOR DELAWARE AND SOUTHERN NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

LAT...LON 4044 7553 4042 7548 4048 7542 4043 7509
      4027 7512 4008 7525 4021 7556 4021 7558
      4024 7560 4023 7561 4025 7569
TIME...MOT...LOC 2153Z 278DEG 15KT 4043 7544 4031 7544
          4017 7554

$$

PAC017-091-272230-
/O.CON.KPHI.SV.W.0038.000000T0000Z-140527T2230Z/
BUCKS PA-MONTGOMERY PA-
553 PM EDT TUE MAY 27 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR MONTGOMERY AND WESTERN BUCKS COUNTIES...

AT 551 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 GERYVILLE TO GREEN LANE TO TRAPPE...OR ALONG A LINE
EXTENDING FROM 11 MILES SOUTH OF ALLENTOWN TO 19 MILES SOUTH OF
ALLENTOWN TO 15 MILES NORTH OF WEST CHESTER...MOVING EAST AT 15 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  TRAPPE BY 600 PM EDT...
  TRUMBAUERSVILLE...HARLEYSVILLE AND COLLEGEVILLE BY 605 PM EDT...
  QUAKERTOWN...SKIPPACK AND EVANSBURG BY 610 PM EDT...
  TELFORD...SELLERSVILLE AND EAGLEVILLE BY 615 PM EDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHEASTERN MARYLAND AND EASTERN PENNSYLVANIA. A
SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT EDT
WEDNESDAY MORNING FOR DELAWARE AND SOUTHERN NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

LAT...LON 4044 7553 4042 7548 4048 7542 4043 7509
      4027 7512 4008 7525 4021 7556 4021 7558
      4024 7560 4023 7561 4025 7569
TIME...MOT...LOC 2153Z 278DEG 15KT 4043 7544 4031 7544
          4017 7554

$$

HEAVENER

087 
WWUS51 KPHI 272204
SVSPHI

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

PAC017-091-272230-
/O.CON.KPHI.SV.W.0038.000000T0000Z-140527T2230Z/
BUCKS PA-MONTGOMERY PA-
604 PM EDT TUE MAY 27 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR CENTRAL MONTGOMERY AND WESTERN BUCKS COUNTIES...

AT 600 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 7 MILES NORTHWEST OF SELLERSVILLE
TO HARLEYSVILLE TO TRAPPE...OR ALONG A LINE EXTENDING FROM 12 MILES
SOUTH OF ALLENTOWN TO 20 MILES SOUTH OF ALLENTOWN TO 15 MILES NORTH
OF WEST CHESTER...MOVING EAST AT 15 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  SKIPPACK AND EVANSBURG BY 610 PM EDT...
  TELFORD...SELLERSVILLE...EAGLEVILLE AND SOUDERTON BY 615 PM EDT...
  TROOPER...KULPSVILLE...PERKASIE AND HATFIELD BY 620 PM EDT...

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHEASTERN MARYLAND AND EASTERN PENNSYLVANIA. A
SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT EDT
WEDNESDAY MORNING FOR DELAWARE AND SOUTHERN NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

LAT...LON 4046 7530 4043 7509 4027 7512 4008 7525
      4019 7551
TIME...MOT...LOC 2204Z 278DEG 15KT 4042 7538 4030 7538
          4016 7548

$$
 
HEAVENER

833 
WWUS51 KPHI 272222 RRA
SVSPHI

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

PAC017-091-272233-
/O.EXP.KPHI.SV.W.0038.000000T0000Z-140527T2230Z/
BUCKS PA-MONTGOMERY PA-
622 PM EDT TUE MAY 27 2014

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONTGOMERY AND WESTERN
BUCKS COUNTIES WILL EXPIRE AT 630 PM EDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHEASTERN MARYLAND AND EASTERN PENNSYLVANIA. A
SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT EDT
WEDNESDAY MORNING FOR DELAWARE AND SOUTHERN NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

LAT...LON 4046 7530 4043 7509 4027 7512 4008 7525
      4019 7551
TIME...MOT...LOC 2223Z 278DEG 15KT 4041 7528 4029 7528
          4015 7538

$$

HEAVENER

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, 4:47 PM EDT	Severe Thunderstorm Warning	PHI	Berks	43 min
May 27, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery	67 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.