Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 93, NWS State College, PA

July 7, 20215 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 7, 2021, 7:31 PM EDT for 5 counties in Pennsylvania. It was in force for 44 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
Jul 7, 2021, 7:31 PM EDT (23:31 UTC)
Expired
Jul 7, 2021, 8:15 PM EDT
In force
44 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

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

The radar

The State College radar (KCCX), 89 km from the middle of the area, began a volume at 23:34 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 7, 7:39 PM EDTTSTM WND DMG6 Nne Glen Union, PATREES DOWN ON WIRES.
Jul 7, 8:01 PM EDTTSTM WND DMG1 Ne South Williamsport, PATREES AND WIRES DOWN ALONG SECOND AVE. IN SOUTH WILLIAMSPORT.
Jul 7, 8:17 PM EDTTSTM WND GST 64Montoursville, PAKIPT MEASURED THUNDERSTORM WIND GUST 64 MPH.
Jul 7, 8:23 PM EDTTSTM WND DMGGarden View, PAREPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.

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 7, 2:41 PM EDTSevere Thunderstorm WatchSPC10 hr
Jul 7, 3:31 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 11.5 hours before the alert went out and 228 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 2021-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 161 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 2021-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
161 J/kg
Mixed-layer CIN
-85 J/kg
Mixed-layer LCL
734 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

349 
WUUS51 KCTP 072331
SVRCTP
PAC035-081-093-097-119-080015-
/O.NEW.KCTP.SV.W.0093.210707T2331Z-210708T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
731 PM EDT Wed Jul 7 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northwestern Northumberland County in central Pennsylvania...
  Montour County in central Pennsylvania...
  Lycoming County in north central Pennsylvania...
  Union County in central Pennsylvania...
  Central Clinton County in north central Pennsylvania...

* Until 815 PM EDT.

* At 730 PM EDT, severe thunderstorms were located along a line
  extending from near Tamarack to near Hyner to near Dunnstown to
  Carroll to Penns Creek, moving east at 90 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...
  Williamsport, Lock Haven, Milton, Lewisburg, Danville,
  Montoursville, Jersey Shore, Northumberland, Mifflinburg, Carroll,
  Winfield, Muncy, Watsontown, Hughesville, Riverside, Montgomery,
  Linntown, Avis, Dunnstown and Renovo.

For those driving on Interstate 80, this includes areas between the
Loganton and Buckhorn exits, specifically from mile markers 185 to
228.

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 4159 7681 4141 7675 4131 7660 4127 7646
      4116 7659 4115 7664 4096 7652 4094 7653
      4085 7714 4096 7724 4104 7715 4101 7728
      4118 7748 4144 7798 4148 7775 4148 7760
      4151 7760 4155 7737 4155 7696 4160 7688
TIME...MOT...LOC 2330Z 253DEG 79KT 4138 7780 4131 7761 4120 7740 4103
7719 4088 7706

HAIL...1.00IN
WIND...60MPH
 
$$

Jurewicz
1 follow-up statement
526 
WWUS51 KCTP 072353
SVSCTP

Severe Weather Statement
National Weather Service State College PA
753 PM EDT Wed Jul 7 2021

PAC035-080003-
/O.CAN.KCTP.SV.W.0093.000000T0000Z-210708T0015Z/
Clinton PA-
753 PM EDT Wed Jul 7 2021

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

The storms which prompted the warning have moved out of the warned 
area.

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

LAT...LON 4159 7681 4141 7675 4131 7660 4127 7646
      4116 7659 4115 7664 4106 7661 4105 7658
      4100 7657 4097 7652 4094 7653 4088 7691
      4107 7700 4128 7717 4139 7738 4147 7760
      4151 7760 4154 7741 4155 7696 4160 7688
TIME...MOT...LOC 2353Z 247DEG 51KT 4148 7753 4141 7734 4130 7713 4109
7696 4093 7688

$$

PAC081-093-097-119-080015-
/O.CON.KCTP.SV.W.0093.000000T0000Z-210708T0015Z/
Northumberland PA-Montour PA-Lycoming PA-Union PA-
753 PM EDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR NORTHWESTERN NORTHUMBERLAND...MONTOUR...LYCOMING AND NORTHEASTERN
UNION COUNTIES...

At 753 PM EDT, severe thunderstorms were located along a line
extending from Slate Run to near English Center to near Cogan Station
to near Allenwood to near Linntown, moving east at 40 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...
Williamsport, Milton, Lewisburg, Danville, Montoursville,
Northumberland, Winfield, Muncy, Watsontown, Hughesville, Riverside,
Montgomery, Linntown, Duboistown, New Columbia, Montandon,
Mechanicsville, Allenwood, Elimsport and Lairdsville.

For those driving on Interstate 80, this includes areas between the
Mile Run and Buckhorn exits, specifically from mile markers 203 to
227.

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 4159 7681 4141 7675 4131 7660 4127 7646
      4116 7659 4115 7664 4106 7661 4105 7658
      4100 7657 4097 7652 4094 7653 4088 7691
      4107 7700 4128 7717 4139 7738 4147 7760
      4151 7760 4154 7741 4155 7696 4160 7688
TIME...MOT...LOC 2353Z 247DEG 51KT 4148 7753 4141 7734 4130 7713 4109
7696 4093 7688

HAIL...1.00IN
WIND...60MPH
 
$$

Jurewicz

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 3:35 PM EDTSpecial Weather StatementCTPFulton40 min
Jul 7, 4:00 PM EDTSpecial Weather StatementCTPWarren45 min
Jul 7, 4:05 PM EDTSpecial Weather StatementCTPSomerset25 min
Jul 7, 4:12 PM EDTSpecial Weather StatementCTPSomerset33 min
Jul 7, 4:12 PM EDTSevere Thunderstorm WarningCTPCambria, Somerset47 min
Jul 7, 4:22 PM EDTSevere Thunderstorm WarningCTPBedford, Somerset38 min
Jul 7, 4:44 PM EDTSevere Thunderstorm WarningCTPCambria61 min
Jul 7, 4:46 PM EDTSpecial Weather StatementCTPWarren29 min
Jul 7, 4:48 PM EDTSpecial Weather StatementCTPBedford27 min
Jul 7, 4:54 PM EDTSevere Thunderstorm WarningCTPBedford, Somerset51 min
Jul 7, 4:59 PM EDTSpecial Weather StatementCTPWarren31 min
Jul 7, 5:07 PM EDTSevere Thunderstorm WarningCTPMcKean, Warren53 min
Jul 7, 5:12 PM EDTSpecial Weather StatementCTPBlair33 min
Jul 7, 5:19 PM EDTSevere Thunderstorm WarningCTPBlair41 min
Jul 7, 5:23 PM EDTSevere Thunderstorm WarningCTPBedford37 min
Jul 7, 5:27 PM EDTSpecial Weather StatementCTPClearfield33 min
Jul 7, 5:35 PM EDTSevere Thunderstorm WarningCTPBlair25 min
Jul 7, 5:38 PM EDTSpecial Weather StatementCTPWarren37 min
Jul 7, 5:42 PM EDTSpecial Weather StatementCTPCumberland33 min
Jul 7, 5:48 PM EDTSevere Thunderstorm WarningCTPBlair, Huntingdon57 min
Jul 7, 5:50 PM EDTSevere Thunderstorm WarningCTPCumberland, Franklin40 min
Jul 7, 5:55 PM EDTSevere Thunderstorm WarningCTPMcKean65 min
Jul 7, 6:00 PM EDTSpecial Weather StatementCTPElk30 min
Jul 7, 6:12 PM EDTSevere Thunderstorm WarningCTPCentre, Clearfield, Huntingdon48 min
Jul 7, 6:22 PM EDTSpecial Weather StatementCTPMifflin23 min
Jul 7, 6:29 PM EDTSevere Thunderstorm WarningCTPWarren61 min
Jul 7, 6:36 PM EDTSevere Thunderstorm WarningCTPCentre, Clearfield, Clinton, Mifflin39 min
Jul 7, 6:37 PM EDTSevere Thunderstorm WarningCTPCumberland, Franklin, Perry37 min
Jul 7, 6:43 PM EDTSevere Thunderstorm WarningCTPMcKean, Potter77 min
Jul 7, 6:56 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton, Mifflin, Snyder, Union49 min
Jul 7, 7:09 PM EDTSevere Thunderstorm WarningCTPJuniata, Mifflin, Snyder36 min
Jul 7, 7:19 PM EDTAreal Flood AdvisoryCTPWarren116 min
Jul 7, 7:44 PM EDTAreal Flood AdvisoryCTPMcKean, Potter2 hr
Jul 7, 7:48 PM EDTSpecial Weather StatementCTPBedford27 min
Jul 7, 7:50 PM EDTSpecial Weather StatementCTPTioga10 min
Jul 7, 7:51 PM EDTSpecial Weather StatementCTPPotter24 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.