Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 166, NWS State College, PA

July 28, 20124 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 28, 2012, 5:52 PM EDT for 4 counties in Pennsylvania. It was in force for 53 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 28, 2012, 5:52 PM EDT (21:52 UTC)
Expired: Jul 28, 2012, 6:45 PM EDT
In force: 53 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Dauphin County, PA, Lancaster County, PA, Lebanon County, PA, York County, PA

The radar

The State College radar (KCCX), 130 km from the middle of the area, began a volume at 21:53 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 28, 1:36 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.9 hours before the alert went out and 141 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: 552 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1087 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

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

627 
WUUS51 KCTP 282152
SVRCTP
PAC043-071-075-133-282245-
/O.NEW.KCTP.SV.W.0166.120728T2152Z-120728T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
552 PM EDT SAT JUL 28 2012

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN DAUPHIN COUNTY IN SOUTH CENTRAL PENNSYLVANIA...
  NORTHWESTERN LANCASTER COUNTY IN SOUTH CENTRAL PENNSYLVANIA...
  SOUTHERN LEBANON COUNTY IN SOUTH CENTRAL PENNSYLVANIA...
  NORTHERN YORK COUNTY IN SOUTH CENTRAL PENNSYLVANIA...

* UNTIL 645 PM EDT

* AT 549 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  COLONIAL PARK TO LEWISBERRY TO LAKE MEADE...MOVING EAST AT 15 MPH.
  THESE STORMS ARE CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. 

* LOCATIONS IN THE WARNING INCLUDE...
  SKYLINE VIEW AND MIDDLETOWN...
  DOVER...
  HERSHEY AND WEIGELSTOWN...
  BAINBRIDGE AND MANCHESTER...
  PALMYRA AND CAMPBELLTOWN...
  LAWN AND YORK...

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 240 AND 273...I-81 BETWEEN
MILE MARKERS 66 AND 78...I-83 BETWEEN MILE MARKERS 18 AND 50...I-283.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...THE HARRISBURG
AIRPORT CONNECTOR...STATE HIGHWAY 283...ROUTE 11/15...ROUTE 15...
ROUTE 22...ROUTE 30...ROUTE 322...ROUTE 322/22...ROUTE 422...STATE
ROAD 501.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CREATE WINDS OF MORE THAN 57 MPH...OR HAIL ONE
INCH OR LARGER.

SEVERE THUNDERSTORMS PRODUCE DAMAGE. MOVE INSIDE A PERMANENT BUILDING
NOW TO BE SAFE FROM STRONG WIND GUSTS AND LARGE HAIL.

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1 8 7 7 6 3 3 6 7 7 2.

&&

LAT...LON 3995 7698 4001 7701 4004 7708 4013 7697
      4017 7696 4016 7691 4019 7693 4020 7692
      4020 7693 4022 7690 4022 7686 4028 7692
      4036 7691 4037 7629 4012 7631 3996 7657
TIME...MOT...LOC 2152Z 269DEG 15KT 4028 7679 4012 7680
          4001 7698

$$

FORECASTER: JUNG

1 follow-up statement

327 
WWUS51 KCTP 282229
SVSCTP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
629 PM EDT SAT JUL 28 2012

PAC043-071-075-133-282245-
/O.CON.KCTP.SV.W.0166.000000T0000Z-120728T2245Z/
DAUPHIN PA-LANCASTER PA-LEBANON PA-YORK PA-
629 PM EDT SAT JUL 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTH CENTRAL YORK...SOUTHERN LEBANON...NORTHWESTERN LANCASTER
AND SOUTHEASTERN DAUPHIN COUNTIES...

AT 627 PM EDT...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 CAMPBELLTOWN TO RHEEMS TO
EMIGSVILLE...MOVING EAST AT 15 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  LAWN AND RHEEMS...
  MAYTOWN AND MOUNT JOY...

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 246 AND 273...I-83 BETWEEN
MILE MARKERS 18 AND 35.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...THE HARRISBURG
AIRPORT CONNECTOR...STATE HIGHWAY 283...ROUTE 30...ROUTE 322...ROUTE
422...STATE ROAD 501.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1 8 7 7 6 3 3 6 7 7 2.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
SATURDAY EVENING FOR SOUTH CENTRAL PENNSYLVANIA.

&&

LAT...LON 3996 7671 4009 7685 4013 7686 4019 7683
      4028 7671 4033 7665 4037 7653 4037 7629
      4012 7631 3996 7657
TIME...MOT...LOC 2229Z 269DEG 15KT 4028 7659 4012 7660
          4001 7678

$$

FORECASTER: CERU

The office that day

Everything else NWS State College, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 27, 9:24 PM EDT	Special Weather Statement	CTP	Dauphin	51 min
Jul 28, 4:29 AM EDT	Special Weather Statement	CTP	Cambria	46 min
Jul 28, 6:10 AM EDT	Special Weather Statement	CTP	Cambria	35 min
Jul 28, 12:05 PM EDT	Special Weather Statement	CTP	Cumberland	55 min
Jul 28, 12:13 PM EDT	Flash Flood Watch	CTP	Cameron, Centre, Clearfield, Clinton, Elk, McKean and 2 more	8 hr
Jul 28, 12:57 PM EDT	Special Weather Statement	CTP	York	63 min
Jul 28, 1:49 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	56 min
Jul 28, 2:07 PM EDT	Special Weather Statement	CTP	Elk	53 min
Jul 28, 2:18 PM EDT	Special Weather Statement	CTP	Juniata, Mifflin	42 min
Jul 28, 2:27 PM EDT	Special Weather Statement	CTP	Cameron	48 min
Jul 28, 3:31 PM EDT	Special Weather Statement	CTP	Franklin	29 min
Jul 28, 4:01 PM EDT	Special Weather Statement	CTP	Juniata, Mifflin, Perry	29 min
Jul 28, 4:20 PM EDT	Special Weather Statement	CTP	Adams	40 min
Jul 28, 4:25 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Potter, Tioga	65 min
Jul 28, 4:35 PM EDT	Special Weather Statement	CTP	Montour, Union	55 min
Jul 28, 4:42 PM EDT	Special Weather Statement	CTP	Cumberland, Juniata, Perry	33 min
Jul 28, 5:04 PM EDT	Special Weather Statement	CTP	Northumberland	56 min
Jul 28, 5:05 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Dauphin, Lebanon, Perry, York	55 min
Jul 28, 5:30 PM EDT	Special Weather Statement	CTP	Lycoming	30 min
Jul 28, 5:38 PM EDT	Special Weather Statement	CTP	Union	67 min
Jul 28, 6:01 PM EDT	Special Weather Statement	CTP	Cumberland	29 min
Jul 28, 6:08 PM EDT	Areal Flood Advisory	CTP	Lycoming, Northumberland	119 min
Jul 28, 6:26 PM EDT	Flash Flood Warning	CTP	Lycoming	102 min
Jul 28, 6:46 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, Lebanon, York	59 min
Jul 28, 7:48 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	27 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2012 Every severe thunderstorm warning in 2012

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.