Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 172, NWS Philadelphia/Mount Holly

November 17, 2010Berks County, Carbon County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 17, 2010, 1:49 AM EST for Berks County, Carbon County, Lehigh County, Pennsylvania. It was in force for 56 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: Nov 17, 2010, 1:49 AM EST (06:49 UTC)
Expired: Nov 17, 2010, 2:45 AM EST
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 155 km from the middle of the area, began a volume at 06:49 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
Nov 17, 2:40 AM EST	TSTM WND DMG	2 Wsw Topton, PA	TREE REPORTED DOWN ON WIRES IN BOWERS.

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
Nov 17, 12:06 AM EST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 6.8 hours before the alert went out and 230 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: 30 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 621 m²/s²
0-3 km storm-relative helicity: 799 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.

980 
WUUS51 KPHI 170649
SVRPHI
PAC011-025-077-170745-
/O.NEW.KPHI.SV.W.0172.101117T0649Z-101117T0745Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
149 AM EST WED NOV 17 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF READING...
  NORTHWESTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...

* UNTIL 245 AM EST

* AT 145 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS 
  WERE  LOCATED ALONG A LINE EXTENDING 26 MILES WEST OF LEHIGHTON TO 
  12 MILES WEST OF  LANCASTER...AND MOVING NORTHEAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  STRAUSSTOWN AROUND 200 AM EST...
  WOMELSDORF AROUND 210 AM EST...
  BERNVILLE AROUND 220 AM EST...
  WERNERSVILLE AND HAMBURG AROUND 230 AM EST...
  SHOEMAKERSVILLE AROUND 235 AM EST...
  WEATHERLY...SINKING SPRING...NESQUEHONING AND LEESPORT AROUND 240
  AM EST...

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.

&&

LAT...LON 4052 7637 4054 7618 4060 7605 4059 7603
      4065 7600 4074 7578 4084 7594 4091 7600
      4100 7575 4106 7578 4112 7564 4106 7558
      4065 7564 4032 7583 4023 7596 4046 7638
TIME...MOT...LOC 0649Z 242DEG 24KT 4082 7619 4042 7629
          4002 7650

$$

HAYES

1 follow-up statement

534 
WWUS51 KPHI 170713
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
213 AM EST WED NOV 17 2010

PAC011-025-077-170745-
/O.CON.KPHI.SV.W.0172.000000T0000Z-101117T0745Z/
BERKS PA-LEHIGH PA-CARBON PA-
213 AM EST WED NOV 17 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM EST
FOR CARBON...NORTHWESTERN LEHIGH AND BERKS COUNTIES...

AT 208 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS 
WERE LOCATED ALONG A LINE EXTENDING FROM FROM 17 MILES WEST OF 
LEHIGHTON TO LANCASTER...MOVING NORTHEAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  TRESCKOW AND PORT CLINTON BY 220 AM EST...
  BEAVER MEADOWS AND HAMBURG BY 225 AM EST...
  WERNERSVILLE...LANSFORD AND CENTERPORT BY 230 AM EST...
  WEATHERLY...SUMMIT HILL AND SHOEMAKERSVILLE BY 235 AM EST...

LAT...LON 4052 7637 4054 7618 4060 7605 4059 7603
      4065 7600 4074 7578 4084 7594 4091 7600
      4100 7575 4106 7578 4112 7564 4106 7558
      4065 7564 4032 7583 4023 7596 4046 7638
TIME...MOT...LOC 0713Z 242DEG 24KT 4089 7600 4049 7610
          4009 7632

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 17, 12:33 AM EST	Special Weather Statement	PHI	Carbon	57 min
Nov 17, 1:23 AM EST	Special Weather Statement	PHI	Berks, Carbon	67 min
Nov 17, 1:44 AM EST	Special Weather Statement	PHI	Chester	61 min
Nov 17, 2:16 AM EST	Special Weather Statement	PHI	Chester, Lehigh	59 min
Nov 17, 2:35 AM EST	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	55 min
Nov 17, 2:40 AM EST	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	65 min
Nov 17, 3:13 AM EST	Severe Thunderstorm Warning	PHI	Bucks	62 min
Nov 17, 3:28 AM EST	Severe Thunderstorm Warning	PHI	Bucks, Carbon, Lehigh, Monroe, Northampton	62 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.