Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 280, NWS State College, PA

September 15, 2021Cumberland County, Franklin County, Perry County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Sep 15, 2021, 4:43 PM EDT for Cumberland County, Franklin County, Perry County, Pennsylvania. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 15, 2021, 4:43 PM EDT (20:43 UTC)
Expired
Sep 15, 2021, 5:15 PM EDT
In force
32 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Cumberland County, PA, Franklin County, PA, Perry County, PA

The radar

The State College radar (KCCX), 92 km from the middle of the area, began a volume at 20:45 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.

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

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.7 hours before the alert went out and 137 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, Washington/Dulle, VA at 12:00Z on 2021-09-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 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, Washington/Dulle, VA at 12:00Z on 2021-09-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 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
13 J/kg
Mixed-layer CIN
-270 J/kg
Mixed-layer LCL
1457 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

123 
WUUS51 KCTP 152043
SVRCTP
PAC041-055-099-152115-
/O.NEW.KCTP.SV.W.0280.210915T2043Z-210915T2115Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northeastern Franklin County in south central Pennsylvania...
  Northwestern Cumberland County in south central Pennsylvania...
  South central Perry County in south central Pennsylvania...

* Until 515 PM EDT.

* At 442 PM EDT, a severe thunderstorm was located near Roxbury,
  moving east at 25 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...
  Newville, Bloserville, Colonel Denning State Park and Roxbury. 

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 198 to 217.
 Interstate 81 from mile markers 37 to 39.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4011 7769 4019 7768 4034 7736 4013 7730
TIME...MOT...LOC 2042Z 257DEG 21KT 4017 7762 

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

$$

Evanego
1 follow-up statement
812 
WWUS51 KCTP 152108
SVSCTP

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

PAC055-152118-
/O.CAN.KCTP.SV.W.0280.000000T0000Z-210915T2115Z/
Franklin PA-
508 PM EDT Wed Sep 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN FRANKLIN COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4017 7752 4025 7754 4034 7736 4013 7730
TIME...MOT...LOC 2108Z 257DEG 21KT 4020 7742 

$$

PAC041-099-152115-
/O.CON.KCTP.SV.W.0280.000000T0000Z-210915T2115Z/
Cumberland PA-Perry PA-
508 PM EDT Wed Sep 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHWESTERN CUMBERLAND AND SOUTH CENTRAL PERRY COUNTIES...

At 508 PM EDT, a severe thunderstorm was located over Newville,
moving east at 25 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...
Newville, Bloserville and Colonel Denning State Park. 

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 207 to 217.
 Interstate 81 from mile markers 38 to 39.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4017 7752 4025 7754 4034 7736 4013 7730
TIME...MOT...LOC 2108Z 257DEG 21KT 4020 7742 

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, 1:44 PM EDTSevere Thunderstorm WarningCTPCentre31 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, 4:46 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.