Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 273, NWS State College, PA

September 15, 2021Centre County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Sep 15, 2021, 1:44 PM EDT for Centre County, Pennsylvania. It was in force for 31 min. 3 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
Sep 15, 2021, 1:44 PM EDT (17:44 UTC)
Expired
Sep 15, 2021, 2:15 PM EDT
In force
31 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Centre County, PA

The radar

The State College radar (KCCX), 33 km from the middle of the area, began a volume at 17:47 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
Sep 15, 1:57 PM EDTTSTM WND DMG2 N State College, PAMULTIPLE WIRES DOWN ON ORCHARD ROAD ON THE PSU CAMPUS.
Sep 15, 2:00 PM EDTTSTM WND DMG1 Sw Bellefonte, PATREES AND WIRES DOWN.
Sep 15, 2:00 PM EDTTSTM WND DMG1 Wsw Bellefonte, PATREES DOWN HILLARY RD. SPRING TWP.

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
Sep 15, 11:55 AM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 5.7 hours before the alert went out and 218 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, Pittsburgh, PA at 12:00Z on 2021-09-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 681 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, Pittsburgh, PA at 12:00Z on 2021-09-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 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
681 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
728 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
97 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

770 
WUUS51 KCTP 151744
SVRCTP
PAC027-151815-
/O.NEW.KCTP.SV.W.0273.210915T1744Z-210915T1815Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Central Centre County in central Pennsylvania...

* Until 215 PM EDT.

* At 144 PM EDT, a severe thunderstorm was located near Houserville,
  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.

* Locations impacted include...
  State College, Bellefonte, Pleasant Gap, Lamar, Lemont, Zion,
  Houserville, Centre Hall, Milesburg, Millheim, Spring Mills,
  Coburn, Madisonburg, Bald Eagle State Park, Howard, Unionville,
  Pennsylvania State University and University Park Airport.

For those driving on Interstate 80, this includes areas between the
Snow Shoe and Lamar exits, specifically from mile markers 157 to 170.

This includes Interstate 99 from mile markers 73 to 85.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4105 7758 4098 7752 4097 7752 4096 7750
      4084 7744 4080 7787 4091 7791
TIME...MOT...LOC 1744Z 251DEG 27KT 4087 7782 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Evanego

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 15, 11:48 AM EDTSpecial Weather StatementCTPWarren42 min
Sep 15, 1:11 PM EDTSpecial Weather StatementCTPSullivan49 min
Sep 15, 1:27 PM EDTSpecial Weather StatementCTPCentre33 min
Sep 15, 1:48 PM EDTSevere Thunderstorm WarningCTPSullivan42 min
Sep 15, 2:14 PM EDTAreal Flood AdvisoryCTPLycoming, Sullivan2 hr
Sep 15, 2:14 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton31 min
Sep 15, 2:36 PM EDTFlash Flood WarningCTPLycoming, Sullivan66 min
Sep 15, 2:45 PM EDTSpecial Weather StatementCTPUnion30 min
Sep 15, 2:46 PM EDTSpecial Weather StatementCTPSullivan44 min
Sep 15, 2:54 PM EDTSevere Thunderstorm WarningCTPClinton, Lycoming, Northumberland, Union36 min
Sep 15, 3:13 PM EDTSpecial Weather StatementCTPUnion17 min
Sep 15, 3:20 PM EDTSevere Thunderstorm WarningCTPJuniata, Mifflin40 min
Sep 15, 3:24 PM EDTSevere Thunderstorm WarningCTPMontour, Northumberland, Union36 min
Sep 15, 3:30 PM EDTSpecial Weather StatementCTPHuntingdon30 min
Sep 15, 3:55 PM EDTSpecial Weather StatementCTPSnyder35 min
Sep 15, 3:59 PM EDTSpecial Weather StatementCTPColumbia, Montour31 min
Sep 15, 4:03 PM EDTAreal Flood AdvisoryCTPLycoming, Sullivan2 hr
Sep 15, 4:12 PM EDTFlash Flood WarningCTPColumbia, Lycoming, Sullivan3 hr
Sep 15, 4:18 PM EDTSevere Thunderstorm WarningCTPColumbia27 min
Sep 15, 4:27 PM EDTSpecial Weather StatementCTPPerry33 min
Sep 15, 4:36 PM EDTSpecial Weather StatementCTPColumbia, Northumberland24 min
Sep 15, 4:43 PM EDTSevere Thunderstorm WarningCTPCumberland, Franklin, Perry32 min
Sep 15, 4:46 PM EDTAreal Flood AdvisoryCTPMontour, Northumberland89 min
Sep 15, 4:58 PM EDTSpecial Weather StatementCTPNorthumberland32 min
Sep 15, 4:59 PM EDTSpecial Weather StatementCTPPerry31 min
Sep 15, 5:15 PM EDTSpecial Weather StatementCTPPerry30 min
Sep 15, 5:19 PM EDTSpecial Weather StatementCTPFranklin26 min
Sep 15, 5:32 PM EDTSpecial Weather StatementCTPDauphin28 min
Sep 15, 5:37 PM EDTSpecial Weather StatementCTPSchuylkill23 min
Sep 15, 5:54 PM EDTSpecial Weather StatementCTPLebanon36 min
Sep 15, 6:16 PM EDTSpecial Weather StatementCTPYork29 min
Sep 15, 6:17 PM EDTSevere Thunderstorm WarningCTPLebanon, Schuylkill43 min
Sep 15, 6:24 PM EDTSevere Thunderstorm WarningCTPAdams, Franklin27 min
Sep 15, 6:41 PM EDTSpecial Weather StatementCTPDauphin34 min
Sep 15, 6:54 PM EDTSpecial Weather StatementCTPBerks21 min
Sep 15, 7:09 PM EDTAreal Flood AdvisoryCTPDauphin, York96 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.