Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 13, NWS State College, PA

May 4, 2012Dauphin County, Perry County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at May 4, 2012, 6:11 PM EDT for Dauphin County, Perry County, Pennsylvania. It was in force for 34 min. 3 reports 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: May 4, 2012, 6:11 PM EDT (22:11 UTC)
Expired: May 4, 2012, 6:45 PM EDT
In force: 34 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Dauphin County, PA, Perry County, PA

The radar

The State College radar (KCCX), 107 km from the middle of the area, began a volume at 22:11 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
May 4, 6:22 PM EDT	HAIL 1	Millersburg, PA
May 4, 6:25 PM EDT	TSTM WND DMG	Millersburg, PA	LARGE LIMBS DOWNED
May 4, 6:28 PM EDT	HAIL 0.88	Millersburg, PA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.2 hours before the alert went out and 183 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: 891 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 905 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 136 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.

303 
WUUS51 KCTP 042211
SVRCTP
PAC043-099-042245-
/O.NEW.KCTP.SV.W.0013.120504T2211Z-120504T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
611 PM EDT FRI MAY 4 2012

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN DAUPHIN COUNTY IN SOUTH CENTRAL PENNSYLVANIA...
  NORTHEASTERN PERRY COUNTY IN SOUTH CENTRAL PENNSYLVANIA...

* UNTIL 645 PM EDT

* AT 606 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR MILLERSBURG...MOVING
  SOUTHEAST AT 15 MPH. THIS STORM IS CAPABLE OF PRODUCING QUARTER
  SIZE HAIL. 

* LOCATIONS IN THE WARNING INCLUDE...
  ELIZABETHVILLE...
  DEHART DAM AND LYKENS...

THIS WILL IMPACT I-81 BETWEEN MILE MARKERS 76 AND 77.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11/15...ROUTE
209.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGE. MOVE INSIDE A PERMANENT BUILDING
NOW TO BE SAFE FROM 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 4053 7706 4061 7700 4063 7697 4063 7695
      4060 7692 4062 7689 4054 7659 4051 7661
      4048 7668 4043 7666 4034 7672
TIME...MOT...LOC 2211Z 296DEG 15KT 4054 7693

$$

FORECASTER: KF

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 8:00 PM EDT	Areal Flood Advisory	CTP	Bedford, Franklin, Fulton	3 hr
May 3, 8:10 PM EDT	Special Weather Statement	CTP	Franklin	65 min
May 4, 12:27 AM EDT	Special Weather Statement	CTP	McKean	33 min
May 4, 12:46 AM EDT	Severe Thunderstorm Warning	CTP	McKean, Potter, Warren	59 min
May 4, 3:22 AM EDT	Special Weather Statement	CTP	Columbia, Montour, Union	68 min
May 4, 1:44 PM EDT	Special Weather Statement	CTP	Dauphin	46 min
May 4, 3:20 PM EDT	Special Weather Statement	CTP	Schuylkill	25 min
May 4, 4:57 PM EDT	Special Weather Statement	CTP	Cameron	48 min
May 4, 5:48 PM EDT	Special Weather Statement	CTP	Dauphin	27 min
May 4, 6:08 PM EDT	Special Weather Statement	CTP	Dauphin	37 min
May 4, 7:18 PM EDT	Special Weather Statement	CTP	Perry	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.