Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 22, NWS Philadelphia/Mount Holly

May 31, 2015Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 31, 2015, 5:23 PM EDT for Berks County, Pennsylvania. It was in force for 37 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 31, 2015, 5:23 PM EDT (21:23 UTC)
Expired: May 31, 2015, 6:00 PM EDT
In force: 37 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Berks County, PA

The radar

The State College radar (KCCX), 153 km from the middle of the area, began a volume at 21:27 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.4 hours before the alert went out and 195 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: 42 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 1212 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 93 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.

277 
WUUS51 KPHI 312123
SVRPHI
PAC011-312200-
/O.NEW.KPHI.SV.W.0022.150531T2123Z-150531T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
523 PM EDT SUN MAY 31 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 600 PM EDT

* AT 522 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING LARGE HAIL UP TO PING PONG BALL SIZE AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
  MYERSTOWN...AND MOVING NORTH AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  STRAUSSTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE 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.

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

&&

LAT...LON 4049 7643 4052 7635 4051 7635 4052 7634
      4052 7625 4054 7617 4052 7616 4039 7617
      4038 7618 4038 7626
TIME...MOT...LOC 2122Z 166DEG 13KT 4043 7628 

$$

1 follow-up statement

402 
WWUS51 KPHI 312152
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
552 PM EDT SUN MAY 31 2015

PAC011-312201-
/O.EXP.KPHI.SV.W.0022.000000T0000Z-150531T2200Z/
BERKS PA-
552 PM EDT SUN MAY 31 2015

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BERKS COUNTY WILL
EXPIRE AT 600 PM EDT...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED AND 
IS MOVING OUT OF THE WARNED AREA.  THE WARNING WILL BE ALLOWED TO
EXPIRE AT 6 PM.

LAT...LON 4049 7643 4052 7635 4051 7635 4052 7634
      4052 7625 4054 7617 4052 7616 4039 7617
      4038 7618 4038 7626
TIME...MOT...LOC 2148Z 166DEG 13KT 4043 7628 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 8:19 PM EDT	Special Weather Statement	PHI	Carbon	56 min
May 30, 8:46 PM EDT	Special Weather Statement	PHI	Lebanon	29 min
May 30, 9:03 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
May 30, 9:11 PM EDT	Special Weather Statement	PHI	Lebanon	64 min
May 30, 9:20 PM EDT	Special Weather Statement	PHI	Carbon	55 min
May 30, 9:36 PM EDT	Areal Flood Advisory	PHI	Carbon	3 hr
May 31, 1:00 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	45 min
May 31, 1:11 PM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Northampton	13 hr
May 31, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	42 min
May 31, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	63 min
May 31, 5:42 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	6 hr
May 31, 7:08 PM EDT	Special Weather Statement	PHI	Lehigh	82 min
May 31, 7:27 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	5 hr
May 31, 7:46 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh	4 hr
May 31, 7:48 PM EDT	Severe Thunderstorm Warning	PHI	Berks	35 min
May 31, 7:57 PM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	6 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.