Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 57, NWS Philadelphia/Mount Holly

June 23, 2015Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 23, 2015, 4:11 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 24 min. 1 report 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: Jun 23, 2015, 4:11 PM EDT (20:11 UTC)
Expired: Jun 23, 2015, 4:35 PM EDT
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 138 km from the middle of the area, began a volume at 20:11 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
Jun 23, 4:16 PM EDT	TSTM WND DMG	Upper Tulpehocken Twp, PA	TREES DOWN. ALSO IN CENTRE AND BRECKNOCK TWPS.

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
Jun 23, 10:20 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 23, 4:09 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.2 hours before the alert went out and 214 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: 387 J/kg
Mixed-layer CIN: -168 J/kg
Mixed-layer LCL: 1544 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

311 
WUUS51 KPHI 232011
SVRPHI
PAC011-077-232100-
/O.NEW.KPHI.SV.W.0057.150623T2011Z-150623T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
411 PM EDT TUE JUN 23 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

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

* UNTIL 500 PM EDT

* AT 410 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM NEAR
  STRAUSSTOWN TO BERNVILLE TO WOMELSDORF...AND MOVING EAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ROBESONIA AROUND 415 PM EDT.
  FAIRVIEW HGTS AROUND 420 PM EDT.
  HAMBURG...SINKING SPRING...LEESPORT AND SHOEMAKERSVILLE AROUND 425
  PM EDT.
  READING...WYOMISSING AND SPRING RIDGE AROUND 430 PM EDT.
  LAURELDALE AND LENHARTSVILLE AROUND 435 PM EDT.
  KUTZTOWN...FLEETWOOD AND WANAMAKERS AROUND 440 PM EDT.
  LYONS AROUND 445 PM EDT.
  TOPTON AROUND 450 PM EDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE WEST
LAWN...SHILLINGTON...AMITY GARDENS...ST. LAWRENCE...MACUNGIE...FLYING
HILLS...MOUNT PENN...CENTERPORT...LORANE AND ALBURTIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...HAIL...DEADLY 
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN 
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY 
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER 
COVERS THE ROAD.

IN ADDITION TO HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO GROUND 
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY. 
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4046 7619 4053 7623 4058 7605 4057 7602
      4065 7598 4067 7582 4052 7544 4047 7545
      4043 7550 4045 7553 4026 7569 4024 7604
      4037 7623
TIME...MOT...LOC 2010Z 263DEG 30KT 4055 7616 4047 7611 4041 7613 4037
7619

$$

1 follow-up statement

015 
WWUS51 KPHI 232035
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
435 PM EDT TUE JUN 23 2015

PAC011-077-232044-
/O.CAN.KPHI.SV.W.0057.000000T0000Z-150623T2100Z/
BERKS PA-LEHIGH PA-
435 PM EDT TUE JUN 23 2015

...THE SEVERE THUNDERSTORM WARNING FOR BERKS AND SOUTHERN LEHIGH
COUNTIES IS CANCELLED...

THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED. THEREFORE THE 
WARNING HAS BEEN CANCELLED.



LAT...LON 4046 7619 4053 7623 4058 7605 4057 7602
      4065 7598 4067 7582 4052 7544 4047 7545
      4043 7550 4045 7553 4026 7569 4024 7604
      4037 7623
TIME...MOT...LOC 2033Z 263DEG 30KT 4055 7616 4047 7611 4041 7613 4037
7619

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 8:30 AM EDT	Special Weather Statement	PHI	Monroe	60 min
Jun 23, 9:10 AM EDT	Special Weather Statement	PHI	Monroe	35 min
Jun 23, 10:37 AM EDT	Special Weather Statement	PHI	Carbon, Monroe	38 min
Jun 23, 11:13 AM EDT	Special Weather Statement	PHI	Monroe	32 min
Jun 23, 1:31 PM EDT	Special Weather Statement	PHI	Carbon, Monroe, Northampton	59 min
Jun 23, 1:41 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	49 min
Jun 23, 2:29 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	46 min
Jun 23, 3:49 PM EDT	Special Weather Statement	PHI	Berks, Bucks, Chester, Montgomery	86 min
Jun 23, 4:44 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	61 min
Jun 23, 5:05 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery	40 min
Jun 23, 5:19 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	4 hr
Jun 23, 5:22 PM EDT	Tornado Warning	PHI	Chester	23 min
Jun 23, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	47 min
Jun 23, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	52 min
Jun 23, 5:44 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware, Montgomery, Philadelphia	4 hr
Jun 23, 6:18 PM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	4 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2015 Every severe thunderstorm warning in 2015

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.