Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 157, NWS State College, PA

July 13, 20215 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 13, 2021, 9:30 PM EDT for 5 counties in Pennsylvania. It was in force for 60 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
Jul 13, 2021, 9:30 PM EDT (01:30 UTC)
Expired
Jul 13, 2021, 10:30 PM EDT
In force
60 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Clinton County, PA, Lycoming County, PA, Northumberland County, PA, Snyder County, PA, Union County, PA

The radar

The State College radar (KCCX), 91 km from the middle of the area, began a volume at 01:29 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
Jul 13, 9:50 PM EDTTSTM WND DMG1 Ene Allenwood, PACORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 ENE ALLENWOOD. TREES DOWN IN THE VICINITY OF GREGG AND WHITE DEER TOWNSHIP.

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
Jul 13, 1:37 PM EDTSevere Thunderstorm WatchSPC10 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.5 hours before the alert went out and 237 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 00:00Z on 2021-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1133 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 00:00Z on 2021-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 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
1133 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
1722 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

734 
WUUS51 KCTP 140130
SVRCTP
PAC035-081-097-109-119-140230-
/O.NEW.KCTP.SV.W.0157.210714T0130Z-210714T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
930 PM EDT Tue Jul 13 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Western Northumberland County in central Pennsylvania...
  Snyder County in central Pennsylvania...
  Southeastern Lycoming County in north central Pennsylvania...
  Union County in central Pennsylvania...
  Southeastern Clinton County in north central Pennsylvania...

* Until 1030 PM EDT.

* At 930 PM EDT, severe thunderstorms were located along a line
  extending from near Collomsville to near Carroll to R.B. Winter
  State Park to Laurelton Center to Snyder-Middleswart State Park,
  moving east at 20 mph.

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

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Sand Bridge State Park, Duboistown, Elimsport and Richfield around 
  950 PM EDT.
  Montoursville, Mifflinburg, Williamsport, Penns Creek, Forest 
  Hill, Paxtonville and Spruce Run Reservoir around 1000 PM EDT.
  Middleburg, Allenwood, Vicksburg, Fremont and Mount Pleasant Mills 
  around 1010 PM EDT.
  Milton, Kreamer, Linntown, Watsontown, Montgomery, Kratzerville, 
  New Columbia and Delaware Run around 1020 PM EDT.

Other locations impacted by these severe thunderstorms include
Beavertown, Turbotville, South Williamsport, West Milton, Hartleton,
Garden View, Oval, Picture Rocks, New Berlin and Freeburg.

For those driving on Interstate 80, this includes areas between the
Loganton and Danville exits, specifically from mile markers 188 to
216.

This includes Interstate 180 from mile markers 1 to 29.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4134 7668 4127 7668 4117 7672 4117 7673
      4106 7675 4096 7680 4084 7676 4065 7677
      4072 7735 4089 7731 4104 7714 4104 7716
      4101 7727 4127 7722
TIME...MOT...LOC 0130Z 269DEG 16KT 4120 7714 4107 7716 4098 7721 4088
7722 4080 7725

HAIL...0.75IN
WIND...60MPH
 
$$

Jurewicz
1 follow-up statement
190 
WWUS51 KCTP 140148
SVSCTP

Severe Weather Statement
National Weather Service State College PA
948 PM EDT Tue Jul 13 2021

PAC035-140158-
/O.CAN.KCTP.SV.W.0157.000000T0000Z-210714T0230Z/
Clinton PA-
948 PM EDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CLINTON COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and north central Pennsylvania.

LAT...LON 4070 7717 4071 7721 4086 7715 4096 7714
      4105 7709 4125 7706 4123 7670 4117 7672
      4117 7673 4106 7675 4096 7680 4084 7676
      4065 7677
TIME...MOT...LOC 0148Z 281DEG 23KT 4117 7700 4104 7702 4095 7707 4085
7708 4077 7711

$$

PAC081-097-109-119-140230-
/O.CON.KCTP.SV.W.0157.000000T0000Z-210714T0230Z/
Northumberland PA-Snyder PA-Lycoming PA-Union PA-
948 PM EDT Tue Jul 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR WESTERN NORTHUMBERLAND...SNYDER...SOUTHEASTERN LYCOMING AND UNION
COUNTIES...

At 948 PM EDT, severe thunderstorms were located along a line
extending from near Elimsport to Spruce Run Reservoir to Forest Hill
to Penns Creek to Paxtonville, moving east at 25 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Montoursville and Spruce Run Reservoir around 950 PM EDT.
  Fremont, Vicksburg, New Columbia, Middleburg, Montgomery, Mount 
  Pleasant Mills, Allenwood and Watsontown around 1000 PM EDT.
  Milton, Selinsgrove, Lewisburg, Delaware Run, Winfield, 
  Kratzerville, Kreamer, Linntown, Montandon and Port Trevorton 
  around 1010 PM EDT.
  Northumberland, Sunbury, Shamokin Dam and Hummels Wharf around 
  1020 PM EDT.

Other locations impacted by these severe thunderstorms include
Beavertown, Turbotville, South Williamsport, West Milton, New Berlin,
Freeburg, McEwensville, Herndon, Selinsgrove Airport and Williamsport
Airport.

For those driving on Interstate 80, this includes areas between the
Jersey Shore and Danville exits, specifically from mile markers 198
to 216.

This includes Interstate 180 between mile markers 1 and 15...and from
mile markers 26 to 29.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4070 7717 4071 7721 4086 7715 4096 7714
      4105 7709 4125 7706 4123 7670 4117 7672
      4117 7673 4106 7675 4096 7680 4084 7676
      4065 7677
TIME...MOT...LOC 0148Z 281DEG 23KT 4117 7700 4104 7702 4095 7707 4085
7708 4077 7711

HAIL...0.75IN
WIND...70MPH
 
$$

Jurewicz

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 8:08 PM EDTSpecial Weather StatementCTPFranklin37 min
Jul 13, 8:09 PM EDTSpecial Weather StatementCTPLycoming36 min
Jul 13, 8:17 PM EDTSevere Thunderstorm WarningCTPLycoming, Northumberland, Union43 min
Jul 13, 8:25 PM EDTSpecial Weather StatementCTPHuntingdon35 min
Jul 13, 8:41 PM EDTAreal Flood AdvisoryCTPLycoming, Sullivan, Tioga25 min
Jul 13, 8:51 PM EDTTornado WarningCTPLycoming, Montour, Northumberland24 min
Jul 13, 8:59 PM EDTSevere Thunderstorm WarningCTPLycoming, Sullivan61 min
Jul 13, 9:06 PM EDTFlash Flood WarningCTPLycoming, Sullivan, Tioga3 hr
Jul 13, 9:15 PM EDTSpecial Weather StatementCTPLycoming30 min
Jul 13, 10:18 PM EDTAreal Flood AdvisoryCTPCentre, Clinton, Columbia, Lycoming, Montour, Northumberland and 2 more117 min
Jul 13, 10:18 PM EDTSevere Thunderstorm WarningCTPColumbia, Montour, Northumberland, Snyder, Union57 min
Jul 13, 11:18 PM EDTSpecial Weather StatementCTPColumbia, Montour27 min
Jul 14, 12:12 AM EDTAreal Flood AdvisoryCTPColumbia, Montour, Northumberland2 hr
Jul 14, 1:46 AM EDTAreal Flood AdvisoryCTPLycoming119 min
Jul 14, 1:49 PM EDTSpecial Weather StatementCTPPerry26 min
Jul 14, 4:08 PM EDTSpecial Weather StatementCTPPerry37 min
Jul 14, 4:58 PM EDTSpecial Weather StatementCTPSullivan32 min
Jul 14, 6:52 PM EDTSpecial Weather StatementCTPLycoming23 min
Jul 14, 7:31 PM EDTSpecial Weather StatementCTPColumbia29 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.