Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 61, NWS Philadelphia/Mount Holly

June 22, 2010Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 22, 2010, 4:56 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 34 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: Jun 22, 2010, 4:56 PM EDT (20:56 UTC)
Expired: Jun 22, 2010, 5:30 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 123 km from the middle of the area, began a volume at 20:57 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.9 hours before the alert went out and 71 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: 20 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 1411 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 92 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.

055 
WUUS51 KPHI 222056
SVRPHI
PAC011-029-222130-
/O.NEW.KPHI.SV.W.0061.100622T2056Z-100622T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
456 PM EDT TUE JUN 22 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTH CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...
  NORTHERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 530 PM EDT

* AT 453 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 19 MILES WEST OF HONEY BROOK...
  OR 11 MILES NORTH OF LANCASTER...AND MOVING EAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HONEY BROOK...6 MILES SOUTH OF ELVERSON AND 7 MILES SOUTH OF NEW
  MORGAN AROUND 525 PM EDT...
  GLENMOORE...6 MILES NORTH OF COATESVILLE AND 8 MILES NORTHWEST OF
  DOWNINGTOWN AROUND 530 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

&&

LAT...LON 4012 7558 3988 7563 4000 7598 4001 7597
      4003 7595 4011 7595 4014 7590 4019 7598
      4020 7598
TIME...MOT...LOC 2056Z 291DEG 33KT 4018 7622

$$
DRAG

1 follow-up statement

896 
WWUS51 KPHI 222109
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
509 PM EDT TUE JUN 22 2010

PAC011-029-222130-
/O.CON.KPHI.SV.W.0061.000000T0000Z-100622T2130Z/
CHESTER PA-BERKS PA-
509 PM EDT TUE JUN 22 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR EXTREME SOUTH CENTRAL BERKS AND NORTHERN CHESTER COUNTIES...

AT 506 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 11 MILES WEST OF HONEY BROOK...OR 13 MILES NORTHEAST OF
LANCASTER...MOVING EAST AT 40 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  HONEY BROOK AND 6 MILES SOUTH OF ELVERSON BY 525 PM EDT...
  GLENMOORE...6 MILES NORTH OF COATESVILLE...7 MILES NORTHWEST OF
  THORNDALE AND 7 MILES NORTH OF SOUTH COATESVILLE BY 530 PM EDT...

THERE HAVE BEEN REPORTS OF 1 INCH HAIL WITH THIS STORM NEAR 
PALMYRA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 NORTHERN DELAWARE AND NORTHEAST MARYLAND AND
SOUTHERN NEW JERSEY AND SOUTHEASTERN PENNSYLVANIA.

&&

LAT...LON 4012 7558 3988 7563 4000 7598 4001 7597
      4003 7595 4011 7595 4014 7590 4019 7598
      4020 7598
TIME...MOT...LOC 2108Z 291DEG 33KT 4014 7609

$$


DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 4:38 AM EDT	Excessive Heat Warning	PHI	Delaware, Philadelphia	60 hr
Jun 22, 3:37 PM EDT	Special Weather Statement	PHI	Carbon	38 min
Jun 22, 4:15 PM EDT	Special Weather Statement	PHI	Berks	60 min
Jun 22, 4:23 PM EDT	Special Weather Statement	PHI	Berks	67 min
Jun 22, 4:38 PM EDT	Special Weather Statement	PHI	Chester	52 min
Jun 22, 5:00 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Chester, Lehigh, Monroe, Montgomery and 1 more	60 min
Jun 22, 5:15 PM EDT	Special Weather Statement	PHI	Berks, Chester, Delaware, Montgomery	60 min
Jun 22, 5:29 PM EDT	Special Weather Statement	PHI	Berks, Chester, Delaware, Montgomery	46 min
Jun 22, 5:41 PM EDT	Severe Thunderstorm Warning	PHI	Chester	49 min
Jun 22, 6:29 PM EDT	Severe Thunderstorm Warning	PHI	Chester	46 min
Jun 22, 6:50 PM EDT	Special Weather Statement	PHI	Bucks, Delaware, Philadelphia	55 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010 Every severe thunderstorm warning in 2010

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.