Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 274, NWS State College, PA

September 15, 2021Sullivan County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Sep 15, 2021, 1:48 PM EDT for Sullivan County, Pennsylvania. It was in force for 42 min. 1 report 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: Sep 15, 2021, 1:48 PM EDT (17:48 UTC)
Expired: Sep 15, 2021, 2:30 PM EDT
In force: 42 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Sullivan County, PA

The radar

The Binghamton radar (KBGM), 89 km from the middle of the area, began a volume at 17:51 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
Sep 15, 2:00 PM EDT	TSTM WND DMG	1 Wnw Eagles Mere, PA	TREES DOWN ON WORLDS END RD (PA-309).

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
Sep 15, 11:55 AM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 5.8 hours before the alert went out and 248 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: 236 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 622 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

181 
WUUS51 KCTP 151748
SVRCTP
PAC113-151830-
/O.NEW.KCTP.SV.W.0274.210915T1748Z-210915T1830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
148 PM EDT Wed Sep 15 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Central Sullivan County in north central Pennsylvania...

* Until 230 PM EDT.

* At 147 PM EDT, a line of severe thunderstorms was located near 
  Kettle Creek Gorge to near Overton, moving northeast at 30 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Kettle Creek Gorge, Lincoln Falls, Dushore, Laporte, Forksville,
  Eagles Mere and Hillsgrove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Very heavy rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4149 7623 4145 7626 4134 7661 4142 7675
      4157 7662 4154 7622
TIME...MOT...LOC 1747Z 239DEG 24KT 4148 7650 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Travis

1 follow-up statement

531 
WWUS51 KCTP 151830
SVSCTP

Severe Weather Statement
National Weather Service State College PA
230 PM EDT Wed Sep 15 2021

PAC113-151839-
/O.EXP.KCTP.SV.W.0274.000000T0000Z-210915T1830Z/
Sullivan PA-
230 PM EDT Wed Sep 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SULLIVAN COUNTY WILL
EXPIRE AT 230 PM EDT...
                
The storm which prompted the warning has weakened below severe 
limits. Therefore, the warning will be allowed to expire.  However 
gusty winds and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
north central Pennsylvania.

LAT...LON 4149 7623 4145 7626 4134 7661 4142 7675
      4157 7662 4154 7622
TIME...MOT...LOC 1829Z 239DEG 24KT 4162 7618 

$$

Travis

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 11:48 AM EDT	Special Weather Statement	CTP	Warren	42 min
Sep 15, 1:11 PM EDT	Special Weather Statement	CTP	Sullivan	49 min
Sep 15, 1:27 PM EDT	Special Weather Statement	CTP	Centre	33 min
Sep 15, 1:44 PM EDT	Severe Thunderstorm Warning	CTP	Centre	31 min
Sep 15, 2:14 PM EDT	Areal Flood Advisory	CTP	Lycoming, Sullivan	2 hr
Sep 15, 2:14 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton	31 min
Sep 15, 2:36 PM EDT	Flash Flood Warning	CTP	Lycoming, Sullivan	66 min
Sep 15, 2:45 PM EDT	Special Weather Statement	CTP	Union	30 min
Sep 15, 2:46 PM EDT	Special Weather Statement	CTP	Sullivan	44 min
Sep 15, 2:54 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Northumberland, Union	36 min
Sep 15, 3:13 PM EDT	Special Weather Statement	CTP	Union	17 min
Sep 15, 3:20 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Mifflin	40 min
Sep 15, 3:24 PM EDT	Severe Thunderstorm Warning	CTP	Montour, Northumberland, Union	36 min
Sep 15, 3:30 PM EDT	Special Weather Statement	CTP	Huntingdon	30 min
Sep 15, 3:55 PM EDT	Special Weather Statement	CTP	Snyder	35 min
Sep 15, 3:59 PM EDT	Special Weather Statement	CTP	Columbia, Montour	31 min
Sep 15, 4:03 PM EDT	Areal Flood Advisory	CTP	Lycoming, Sullivan	2 hr
Sep 15, 4:12 PM EDT	Flash Flood Warning	CTP	Columbia, Lycoming, Sullivan	3 hr
Sep 15, 4:18 PM EDT	Severe Thunderstorm Warning	CTP	Columbia	27 min
Sep 15, 4:27 PM EDT	Special Weather Statement	CTP	Perry	33 min
Sep 15, 4:36 PM EDT	Special Weather Statement	CTP	Columbia, Northumberland	24 min
Sep 15, 4:43 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Franklin, Perry	32 min
Sep 15, 4:46 PM EDT	Areal Flood Advisory	CTP	Montour, Northumberland	89 min
Sep 15, 4:58 PM EDT	Special Weather Statement	CTP	Northumberland	32 min
Sep 15, 4:59 PM EDT	Special Weather Statement	CTP	Perry	31 min
Sep 15, 5:15 PM EDT	Special Weather Statement	CTP	Perry	30 min
Sep 15, 5:19 PM EDT	Special Weather Statement	CTP	Franklin	26 min
Sep 15, 5:32 PM EDT	Special Weather Statement	CTP	Dauphin	28 min
Sep 15, 5:37 PM EDT	Special Weather Statement	CTP	Schuylkill	23 min
Sep 15, 5:54 PM EDT	Special Weather Statement	CTP	Lebanon	36 min
Sep 15, 6:16 PM EDT	Special Weather Statement	CTP	York	29 min
Sep 15, 6:17 PM EDT	Severe Thunderstorm Warning	CTP	Lebanon, Schuylkill	43 min
Sep 15, 6:24 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin	27 min
Sep 15, 6:41 PM EDT	Special Weather Statement	CTP	Dauphin	34 min
Sep 15, 6:54 PM EDT	Special Weather Statement	CTP	Berks	21 min
Sep 15, 7:09 PM EDT	Areal Flood Advisory	CTP	Dauphin, York	96 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2021 Every severe thunderstorm warning in 2021

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.