Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 13, NWS State College, PA

April 20, 2017Warren County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Apr 20, 2017, 7:08 PM EDT for Warren County, Pennsylvania. It was in force for 67 min. 7 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: Apr 20, 2017, 7:08 PM EDT (23:08 UTC)
Expired: Apr 20, 2017, 8:15 PM EDT
In force: 67 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Warren County, PA

The radar

The Buffalo radar (KBUF), 121 km from the middle of the area, began a volume at 23:08 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
Apr 20, 7:24 PM EDT	HAIL 0.88	Bear Lake, PA	UP TO NICKEL-SIZED HAIL.
Apr 20, 7:52 PM EDT	FUNNEL CLOUD	Youngsville, PA	FUNNEL CLOUD SPOTTED NORTH OF YOUNGSVILLE.
Apr 20, 7:54 PM EDT	FUNNEL CLOUD	1 N Youngsville, PA	FUNNEL CLOUD POSSIBLY TOUCHING THE GROUND NORTH OF THE 911 CENTER IN YOUNGSVILLE.
Apr 20, 7:54 PM EDT	TORNADO	2 Nnw Youngsville, PA	EF-0 CONFIRMED MAX WINDS 80 MPH
Apr 20, 7:55 PM EDT	TSTM WND DMG	2 Nnw Youngsville, PA	TREES AND WIRES DOWN NEAR MATTHEWS RUN ROAD AND TELIC RUN ROAD.
Apr 20, 7:57 PM EDT	FUNNEL CLOUD	3 Nw Starbrick, PA	MULTIPLE FUNNELS SPOTTED BY FIREFIGHTERS NEAR INTERSECTION OF YANKEE BUSH ROAD AND FOLLET RUN ROAD.
Apr 20, 8:23 PM EDT	FUNNEL CLOUD	3 Nw Starbrick, PA	MULTIPLE FUNNELS SPOTTED BY FIREFIGHTERS NEAR INTERSECTION OF YANKEE BUSH ROAD AND FOLLET RUN ROAD.

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, 11.1 hours before the alert went out and 120 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: 586 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

038 
WUUS51 KCTP 202308
SVRCTP
PAC123-210015-
/O.NEW.KCTP.SV.W.0013.170420T2308Z-170421T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
708 PM EDT THU APR 20 2017

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northern Warren County in north central Pennsylvania...

* Until 815 PM EDT

* At 708 PM EDT, a severe thunderstorm was located near Columbus,
  moving east at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Warren, Scandia, Lottsville, Youngsville, Russell, Columbus, Spring
  Creek, Warren South, Garland, Kinzua Dam, Starbrick, Sugar Grove
  and Bear Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4200 7892 4183 7892 4183 7895 4179 7895
      4181 7961 4200 7960
TIME...MOT...LOC 2308Z 268DEG 30KT 4191 7964 

HAIL...1.00IN
WIND...60MPH
 
$$

La Corte

1 follow-up statement

640 
WWUS51 KCTP 202337
SVSCTP

Severe Weather Statement
National Weather Service State College PA
737 PM EDT THU APR 20 2017

PAC123-210015-
/O.CON.KCTP.SV.W.0013.000000T0000Z-170421T0015Z/
Warren PA-
737 PM EDT THU APR 20 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR NORTHERN WARREN COUNTY...

At 735 PM EDT, a severe thunderstorm was located over Lottsville,
moving east at 30 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. Radar indicated rotation within 
         the storm which could possibly support the development of a 
         tornado.


Locations impacted include...
Warren, Scandia, Lottsville, Russell, Youngsville, Warren South,
Kinzua Dam, Garland, Starbrick and Sugar Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4182 7948 4200 7948 4200 7892 4183 7892
      4183 7895 4179 7895 4179 7906
TIME...MOT...LOC 2335Z 268DEG 27KT 4191 7939 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

La Corte

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 1:40 PM EDT	Special Weather Statement	CTP	Fulton	35 min
Apr 20, 2:12 PM EDT	Special Weather Statement	CTP	Franklin	33 min
Apr 20, 3:23 PM EDT	Special Weather Statement	CTP	Cambria, Somerset	52 min
Apr 20, 3:51 PM EDT	Special Weather Statement	CTP	Huntingdon	39 min
Apr 20, 4:03 PM EDT	Special Weather Statement	CTP	Elk	27 min
Apr 20, 4:06 PM EDT	Special Weather Statement	CTP	Bedford	54 min
Apr 20, 4:52 PM EDT	Special Weather Statement	CTP	Franklin, Fulton	53 min
Apr 20, 5:18 PM EDT	Special Weather Statement	CTP	McKean	57 min
Apr 20, 5:30 PM EDT	Special Weather Statement	CTP	Clinton	60 min
Apr 20, 6:02 PM EDT	Special Weather Statement	CTP	Franklin	28 min
Apr 20, 6:28 PM EDT	Special Weather Statement	CTP	Warren	62 min
Apr 20, 6:33 PM EDT	Special Weather Statement	CTP	Adams	27 min
Apr 20, 7:22 PM EDT	Special Weather Statement	CTP	Adams	38 min
Apr 20, 7:55 PM EDT	Tornado Warning Tornado observed	CTP	Warren	35 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017 Every severe thunderstorm warning in 2017

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.