Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 208, NWS State College, PA

August 12, 2021Lycoming County, Sullivan County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 12, 2021, 1:27 PM EDT for Lycoming County, Sullivan County, Pennsylvania. It was in force for 63 min. 4 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
Aug 12, 2021, 1:27 PM EDT (17:27 UTC)
Expired
Aug 12, 2021, 2:30 PM EDT
In force
63 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Lycoming County, PA, Sullivan County, PA

The radar

The Binghamton radar (KBGM), 103 km from the middle of the area, began a volume at 17:29 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

TimeReportWhereRemark
Aug 12, 1:35 PM EDTTSTM WND DMG4 S Ralston, PAMULTIPLE WIRES DOWN ON ROADWAY.
Aug 12, 1:55 PM EDTTSTM WND DMG2 Se Forksville, PAMULTIPLE WIRES DOWN.
Aug 12, 2:05 PM EDTTSTM WND DMG1 Ese Muncy Valley, PAMULTIPLE TREES DOWN.
Aug 12, 2:12 PM EDTTSTM WND DMG3 Sse Dushore, PATREES DOWN AND GARAGE DOOR BLOWN IN. IMAGES SENT VIA FACEBOOK.

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.

IssuedProductOfficeLasted
Aug 12, 1:11 PM EDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 5.5 hours before the alert went out and 238 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-pSkew-T log-p diagram, Buffalo Intl Airport, NY at 12:00Z on 2021-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 390 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 12:00Z on 2021-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
390 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
843 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

218 
WUUS51 KCTP 121727
SVRCTP
PAC081-113-121830-
/O.NEW.KCTP.SV.W.0208.210812T1727Z-210812T1830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
127 PM EDT Thu Aug 12 2021

The National Weather Service in State College PA has issued a

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

* Until 230 PM EDT.

* At 127 PM EDT, severe thunderstorms were located along a line
  extending from near Ogdensburg to Ralston to near Trout Run, moving
  east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Hughesville, Kettle Creek Gorge, Lairdsville, Ricketts Glen State
  Park, Ralston, Biggertown, Muncy Valley, Trout Run, Lincoln Falls,
  Barbours, Shunk, Loyalsockville, Picture Rocks, 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.

&&

LAT...LON 4132 7631 4131 7641 4119 7656 4140 7720
      4155 7707 4155 7696 4160 7688 4154 7622
TIME...MOT...LOC 1727Z 280DEG 41KT 4164 7694 4151 7698 4140 7710 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Colbert
1 follow-up statement
056 
WWUS51 KCTP 121802
SVSCTP

Severe Weather Statement
National Weather Service State College PA
202 PM EDT Thu Aug 12 2021

PAC081-113-121830-
/O.CON.KCTP.SV.W.0208.000000T0000Z-210812T1830Z/
Lycoming PA-Sullivan PA-
202 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR NORTHEASTERN LYCOMING AND SULLIVAN COUNTIES...

At 201 PM EDT, a severe thunderstorm was located 7 miles south of
Overton, moving east at 45 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Hughesville, Kettle Creek Gorge, Lairdsville, Ricketts Glen State
Park, Biggertown, Muncy Valley, Lincoln Falls, Barbours, Shunk,
Picture Rocks, 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.

Wind damage with this storm will occur before any rain or lightning.
Do not wait for the sound of thunder before taking cover. SEEK
SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4128 7684 4159 7680 4154 7622 4132 7631
      4131 7641 4119 7656
TIME...MOT...LOC 1801Z 274DEG 41KT 4147 7646 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Colbert

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 3:33 AM EDTExcessive Heat WarningCTPAdams, Dauphin, Lancaster, Lebanon, York39 hr
Aug 12, 3:33 AM EDTHeat AdvisoryCTPColumbia, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 8 more39 hr
Aug 12, 12:38 PM EDTSpecial Weather StatementCTPTioga52 min
Aug 12, 12:51 PM EDTSevere Thunderstorm WarningCTPClinton, Lycoming, Potter, Tioga54 min
Aug 12, 1:43 PM EDTSevere Thunderstorm WarningCTPClearfield49 min
Aug 12, 1:47 PM EDTSevere Thunderstorm WarningCTPClinton, Lycoming58 min
Aug 12, 2:15 PM EDTSpecial Weather StatementCTPColumbia30 min
Aug 12, 2:25 PM EDTSpecial Weather StatementCTPLycoming20 min
Aug 12, 2:50 PM EDTSpecial Weather StatementCTPColumbia, Montour25 min
Aug 12, 3:19 PM EDTSpecial Weather StatementCTPSchuylkill41 min
Aug 12, 5:12 PM EDTSevere Thunderstorm WarningCTPWarren48 min
Aug 12, 5:27 PM EDTSpecial Weather StatementCTPTioga33 min
Aug 12, 5:46 PM EDTSevere Thunderstorm WarningCTPClearfield, Elk44 min
Aug 12, 6:25 PM EDTAreal Flood AdvisoryCTPClearfield, Elk2 hr
Aug 12, 6:25 PM EDTSevere Thunderstorm WarningCTPClearfield65 min
Aug 12, 7:07 PM EDTSevere Thunderstorm WarningCTPClearfield, Elk53 min
Aug 12, 7:33 PM EDTSpecial Weather StatementCTPBlair, Cambria27 min
Aug 12, 7:47 PM EDTSpecial Weather StatementCTPCentre28 min
Aug 12, 7:56 PM EDTSevere Thunderstorm WarningCTPCentre, Clearfield49 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2021Every 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.