Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 2, NWS State College, PA

January 17, 20125 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jan 17, 2012, 6:43 PM EST for 5 counties in Pennsylvania. It was in force for 92 min. 2 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: Jan 17, 2012, 6:43 PM EST (23:43 UTC)
Expired: Jan 17, 2012, 8:15 PM EST
In force: 92 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Cameron County, PA, Elk County, PA, McKean County, PA, Potter County, PA, Warren County, PA

The radar

The State College radar (KCCX), 86 km from the middle of the area, began a volume at 23:43 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
Jan 17, 7:00 PM EST	TSTM WND DMG	Bradford, PA	TREE DOWN ON HOUSE
Jan 17, 7:30 PM EST	TSTM WND DMG	5 E Ridgway, PA	TREES DOWN ON RTE 120

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

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 11.7 hours before the alert went out and 161 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: 479 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 218 m²/s²
0-3 km storm-relative helicity: 321 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.

789 
WUUS51 KCTP 172343
SVRCTP
PAC023-047-083-105-123-180115-
/O.NEW.KCTP.SV.W.0002.120117T2343Z-120118T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
643 PM EST TUE JAN 17 2012

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CAMERON COUNTY IN NORTH CENTRAL PENNSYLVANIA...
  ELK COUNTY IN NORTH CENTRAL PENNSYLVANIA...
  MCKEAN COUNTY IN NORTH CENTRAL PENNSYLVANIA...
  WESTERN POTTER COUNTY IN NORTH CENTRAL PENNSYLVANIA...
  EASTERN WARREN COUNTY IN NORTH CENTRAL PENNSYLVANIA...

* UNTIL 815 PM EST

* AT 636 PM EST...A LINE OF SEVERE THUNDERSTORMS WAS EXTENDED FROM 
  SCANDIA TO WORTHINGTON...MOVING EAST AT 45 MPH. THESE STORMS ARE 
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. 

* LOCATIONS IN THE WARNING INCLUDE...
  SHEFFIELD...
  KANE...
  BRADFORD...
  JOHNSONBURG...
  RIDGWAY AND ST MARYS...
  PORT ALLEGANY...
  AND COUDERSPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF SEVERE THUNDERSTORMS HAS A HISTORY OF PRODUCING WIND 
DAMAGE IN WESTERN WARREN COUNTY. DO NOT STAY OUTDOORS.

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

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 4200 7786 4145 7803 4125 7850 4125 7864
      4122 7865 4121 7869 4123 7874 4127 7876
      4137 7897 4134 7910 4142 7910 4143 7907
      4145 7907 4145 7897 4162 7896 4163 7909
      4201 7893
TIME...MOT...LOC 2340Z 269DEG 39KT 4203 7892 4084 7959

$$

FORECASTER: DANGELO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 17, 4:10 AM EST	Wind Advisory	CTP	Cambria, Cameron, Clearfield, Elk, McKean, Potter and 2 more	24 hr
Jan 17, 2:17 PM EST	Lake Effect Snow Advisory	CTP	Warren	24 hr
Jan 17, 5:35 PM EST	Special Weather Statement	CTP	Warren	85 min
Jan 17, 6:07 PM EST	Severe Thunderstorm Warning	CTP	Warren	53 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.