Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 8, NWS Philadelphia/Mount Holly

April 22, 2014Berks County, Chester County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 22, 2014, 6:41 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 49 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: Apr 22, 2014, 6:41 PM EDT (22:41 UTC)
Expired: Apr 22, 2014, 7:30 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Chester County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 134 km from the middle of the area, began a volume at 22:43 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
Apr 22, 7:09 PM EDT	HAIL 1	3 Ese Reading, PA
Apr 22, 7:12 PM EDT	TSTM WND GST 54	2 Se Elverson, PA
Apr 22, 7:12 PM EDT	HAIL 0.5	2 Se Elverson, PA
Apr 22, 7:15 PM EDT	TSTM WND DMG	8 Se Reading, PA	TREES DOWNED ON WEST BOUND 422. TIME ESTIMATED FROM RADAR
Apr 22, 7:34 PM EDT	HAIL 0.75	West Chester, PA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.7 hours before the alert went out and 65 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: 1670 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 151 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.

992 
WUUS51 KPHI 222241
SVRPHI
PAC011-029-091-222330-
/O.NEW.KPHI.SV.W.0008.140422T2241Z-140422T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
641 PM EDT TUE APR 22 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  WEST CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 730 PM EDT

* AT 636 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. ..MOVING SOUTHEAST AT 45 MPH. THESE
  STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.

* SEVERE THUNDERSTORMS WILL AFFECT...FLYING HILL...HONEY 
BROOK...COATESVILLE...GLENMOORE...COCHRANVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS SEVERE THUNDERSTORM MAY CONTAIN LITTLE OR NO LIGHTNING. DO NOT
WAIT TO HEAR THUNDER BEFORE TAKING COVER. SEEK SHELTER IMMEDIATELY
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4047 7623 4025 7548 3985 7564 3977 7575
      3972 7592 3972 7613 3977 7607 3985 7603
      3988 7599 3997 7600 4004 7594 4011 7595
      4014 7589 4036 7621 4038 7626
TIME...MOT...LOC 2240Z 294DEG 37KT 4044 7614 4002 7622
          3990 7667

$$

ROBERTSON

1 follow-up statement

360 
WWUS51 KPHI 222304
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
704 PM EDT TUE APR 22 2014

PAC011-029-091-222330-
/O.CON.KPHI.SV.W.0008.000000T0000Z-140422T2330Z/
BERKS PA-MONTGOMERY PA-CHESTER PA-
704 PM EDT TUE APR 22 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR CHESTER...WEST CENTRAL MONTGOMERY AND SOUTH CENTRAL BERKS
COUNTIES...

AT 659 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. ALONG A LINE EXTENDING FROM CENTRAL BERKS
COUNTY TO EAST CENTRAL LANCASTER COUNTY TO EAST CENTRAL YORK
COUNTY...MOVING SOUTHEAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL AFFECT READING...FLYING HILL...HONEY 
BROOK...COATESVILLE...GLENMOORE...COCHRANVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS. SEEK SHELTER 
NOW INSIDE A STURDY STRUCTURE...AND STAY AWAY FROM WINDOWS.

THIS SEVERE THUNDERSTORM MAY CONTAIN LITTLE OR NO LIGHTNING. DO NOT 
WAIT TO HEAR THUNDER BEFORE TAKING COVER. 

&&

LAT...LON 4040 7602 4025 7548 3985 7564 3977 7575
      3972 7592 3972 7613 3977 7607 3985 7603
      3988 7599 3997 7600 4004 7594 4011 7595
      4014 7589 4024 7604
TIME...MOT...LOC 2302Z 294DEG 37KT 4034 7587 3992 7595
          3981 7640

$$

ROBERTSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 3:23 PM EDT	Fire Weather Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	13 hr
Apr 22, 5:55 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	65 min
Apr 22, 6:54 PM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	51 min
Apr 22, 7:21 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	39 min
Apr 22, 7:52 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	38 min

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.