Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 21, NWS State College, PA

May 11, 2015Warren County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at May 11, 2015, 9:26 PM EDT for Warren County, Pennsylvania. It was in force for 49 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: May 11, 2015, 9:26 PM EDT (01:26 UTC)
Expired: May 11, 2015, 10:15 PM EDT
In force: 49 min
Issued by: NWS State College, PA
Area: Storm-based polygon

County Warren County, PA

The radar

The Buffalo radar (KBUF), 128 km from the middle of the area, began a volume at 01:28 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 11, 9:35 PM EDT	TSTM WND DMG	Tidioute, PA	TWO TREES DOWN.
May 11, 9:50 PM EDT	TSTM WND DMG	2 Ne Sheffield, PA	TREES DOWN ACROSS ROUTE 6.

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
May 11, 8:18 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 1.4 hours before the alert went out and 127 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: 14 J/kg
Mixed-layer CIN: -184 J/kg
Mixed-layer LCL: 1723 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

875 
WUUS51 KCTP 120126
SVRCTP
PAC123-120215-
/O.NEW.KCTP.SV.W.0021.150512T0126Z-150512T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
926 PM EDT MON MAY 11 2015

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WARREN COUNTY IN NORTH CENTRAL PENNSYLVANIA...

* UNTIL 1015 PM EDT

* AT 926 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING DAMAGING WINDS AROUND 60 MPH. THIS STORM WAS
  LOCATED NEAR GRAND VALLEY...AND MOVING NORTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WARREN...SHEFFIELD...YOUNGSVILLE...RUSSELL...WARREN SOUTH...KINZUA
  DAM...GARLAND...GRAND VALLEY...SCANDIA...CHAPMAN STATE PARK...
  TIDIOUTE...SUGAR GROVE...STARBRICK AND CLARENDON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE THUNDERSTORM WIND GUSTS ARE EXPECTED TO PRODUCE DAMAGE. PEOPLE
OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG
BUILDING.

&&

LAT...LON 4200 7892 4185 7891 4183 7892 4183 7895
      4162 7896 4163 7955 4170 7960 4200 7931
TIME...MOT...LOC 0126Z 231DEG 43KT 4171 7945 

$$

DEVOIR

2 follow-up statements

635 
WWUS51 KCTP 120157
SVSCTP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
957 PM EDT MON MAY 11 2015

PAC123-120215-
/O.CON.KCTP.SV.W.0021.000000T0000Z-150512T0215Z/
WARREN PA-
957 PM EDT MON MAY 11 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT
FOR EASTERN WARREN COUNTY...

AT 954 PM EDT...RADAR INDICATED A SEVERE THUNDERSTORM PRODUCING 
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR 
JOHNSONBURG...AND WAS MOVING NORTHEAST AT 40 MPH. 

LAW ENFORCEMENT REPORTED WIND DAMAGE IN TIDIOUTE 935 PM FROM THIS 
STORM. WIND GUSTS BETWEEN 45 MPH AND 65 MPH ARE LIKELY TO THE NORTH 
AND EAST OF THE CITY OF WARREN THROUGH 1005 PM...AS THE STORM 
REACHES THE SOUTHERN NEW YORK BORDER.

LOCATIONS IMPACTED INCLUDE...
WARREN...SHEFFIELD...YOUNGSVILLE...RUSSELL...WARREN SOUTH...
SCANDIA...KINZUA DAM...CHAPMAN STATE PARK...STARBRICK AND CLARENDON.

LAT...LON 4200 7892 4185 7891 4183 7892 4183 7895
      4162 7896 4179 7922 4191 7939 4200 7931
TIME...MOT...LOC 0154Z 231DEG 43KT 4150 7875 

$$

DEVOIR

125 
WWUS51 KCTP 120207
SVSCTP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1007 PM EDT MON MAY 11 2015

PAC123-120215-
/O.CON.KCTP.SV.W.0021.000000T0000Z-150512T0215Z/
WARREN PA-
1007 PM EDT MON MAY 11 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT
FOR NORTHEASTERN WARREN COUNTY...

AT 1006 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
WAS LOCATED NEAR GENESEE...MOVING NORTHEAST AT 50 MPH.

LAW ENFORCEMENT REPORTED EARLIER WIND DAMAGE FROM THIS STORM AS IT 
MOVED THROUGH TIDIOUTE AT 935 PM.

LOCATIONS IMPACTED INCLUDE...
RUSSELL...SCANDIA AND KINZUA DAM. 

LAT...LON 4200 7892 4185 7891 4183 7892 4183 7895
      4181 7896 4185 7902 4192 7914 4200 7926
TIME...MOT...LOC 0206Z 231DEG 43KT 4195 7801 

$$

DEVOIR

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 9:16 PM EDT	Special Weather Statement	CTP	Warren	59 min
May 11, 9:45 PM EDT	Special Weather Statement	CTP	Elk, McKean	45 min
May 11, 10:04 PM EDT	Special Weather Statement	CTP	Cambria, Clearfield	56 min
May 11, 10:37 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria, Centre, Clearfield	38 min
May 11, 10:53 PM EDT	Special Weather Statement	CTP	Cameron, Potter	52 min
May 11, 10:59 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Lycoming, Potter, Tioga	61 min
May 11, 11:06 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cameron, Centre, Clearfield, Clinton, Huntingdon and 1 more	54 min
May 11, 11:59 PM EDT	Special Weather Statement	CTP	Clinton, Huntingdon, Juniata, Lycoming, Mifflin, Perry and 3 more	61 min
May 12, 12:11 AM EDT	Special Weather Statement	CTP	Franklin	64 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2015 Every severe thunderstorm warning in 2015

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.