Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 105, NWS Philadelphia/Mount Holly

July 8, 2014Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2014, 8:38 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 25 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: Jul 8, 2014, 8:38 PM EDT (00:38 UTC)
Expired: Jul 8, 2014, 9:03 PM EDT
In force: 25 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 124 km from the middle of the area, began a volume at 00:37 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 8, 5:05 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.6 hours before the alert went out and 192 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: 1479 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 178 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.

062 
WUUS51 KPHI 090038
SVRPHI
PAC011-029-090200-
/O.NEW.KPHI.SV.W.0105.140709T0038Z-140709T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
838 PM EDT TUE JUL 8 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA...
  CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 1000 PM EDT

* AT 835 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED   
  TO INDICATE SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WINDS IN     
  EXCESS OF 70 MPH...IN ADDITION TO LARGE HAIL. NUMEROUS POWER       
  OUTAGES HAVE BEEN REPORTED...ESPECIALLY IN CHESTER COUNTY. 


PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THEIR 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
TUESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL MIDNIGHT EDT WEDNESDAY MORNING FOR NORTHEAST NEW JERSEY.

&&

LAT...LON 4052 7619 4058 7603 4063 7600 4068 7589
      4044 7554 4024 7570 4024 7560 4009 7546
      4007 7536 3988 7560 3984 7558 3980 7571
      3972 7578 3972 7613 3988 7599 4011 7595
      4014 7589 4035 7620
TIME...MOT...LOC 0037Z 256DEG 27KT 4000 7571

$$

FORECASTER:
JJM

1 follow-up statement

578 
WWUS51 KPHI 090103
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
903 PM EDT TUE JUL 8 2014

PAC011-029-090113-
/O.CAN.KPHI.SV.W.0105.000000T0000Z-140709T0200Z/
BERKS PA-CHESTER PA-
903 PM EDT TUE JUL 8 2014

...THE SEVERE THUNDERSTORM WARNING FOR CHESTER AND BERKS COUNTIES IS
CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
TUESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL MIDNIGHT EDT WEDNESDAY MORNING FOR NORTHEAST NEW JERSEY.

LAT...LON 4052 7619 4058 7603 4063 7600 4068 7589
      4044 7554 4024 7570 4024 7560 4009 7546
      4007 7536 3988 7560 3984 7558 3980 7571
      3972 7578 3972 7613 3988 7599 4011 7595
      4014 7589 4035 7620
TIME...MOT...LOC 0103Z 256DEG 27KT 4005 7546

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 8:06 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Montgomery, Philadelphia	84 min
Jul 8, 8:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	59 min
Jul 9, 2:04 PM EDT	Special Weather Statement	PHI	Lehigh	41 min
Jul 9, 2:40 PM EDT	Special Weather Statement	PHI	Lehigh	65 min
Jul 9, 2:48 PM EDT	Special Weather Statement	PHI	Monroe	72 min
Jul 9, 4:43 PM EDT	Special Weather Statement	PHI	Northampton	62 min
Jul 9, 5:07 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	53 min
Jul 9, 5:28 PM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	92 min
Jul 9, 5:42 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Monroe, Northampton	48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.