Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 97, NWS State College, PA

July 7, 20129 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 7, 2012, 4:26 PM EDT for 9 counties in Pennsylvania. It was in force for 64 min. 8 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, 2012, 4:26 PM EDT (20:26 UTC)
Expired
Jul 7, 2012, 5:30 PM EDT
In force
64 min
Issued by
NWS State College, PA
Area
Storm-based polygon

Counties Centre County, PA, Clinton County, PA, Columbia County, PA, Lycoming County, PA, Montour County, PA, Northumberland County, PA, Snyder County, PA, Sullivan County, PA, Union County, PA

The radar

The State College radar (KCCX), 116 km from the middle of the area, began a volume at 20:27 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, 4:26 PM EDTHAIL 1Williamsport, PAQUARTER-SIZED HAIL REPORTED IN WILLIAMSPORT.
Jul 7, 4:27 PM EDTTSTM WND DMGWilliamsport, PATREES REPORTED DOWN IN THE NEWBERRY NEIGHBORHOOD OF WILLIAMSPORT.
Jul 7, 4:27 PM EDTTSTM WND GST 58Williamsport Regional, PAWIND GUST TO 58 MPH REPORTED BY WILLIAMSPORT REGIONAL AIRPORT ASOS.
Jul 7, 4:30 PM EDTHAIL 0.75Montoursville, PAPENNY-SIZED HAIL REPORTED IN MONTOURSVILLE.
Jul 7, 4:45 PM EDTTSTM WND DMGWatsontown, PATREE DOWN ON CAR.
Jul 7, 4:48 PM EDTTSTM WND DMGBenton, PANUMEROUS TREES AND WIRES DOWN ACROSS NORTHERN COLUMBIA COUNTY.
Jul 7, 4:57 PM EDTTSTM WND DMG4 Wnw Howard, PALARGE LIMBS REPORTED DOWN.
Jul 7, 5:05 PM EDTTSTM WND DMG1 Nw Mifflinburg, PA*** 1 INJ *** TREES AND WIRES DOWN ACROSS ROAD. ONE PERSON INJURED BY LIVE WIRES.

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, 11:41 AM EDTSevere Thunderstorm WatchSPC7 hr
Jul 7, 2:16 PM EDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.4 hours before the alert went out and 245 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 2012-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1804 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2012-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939Sfc1 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
1804 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
1395 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

726 
WUUS51 KCTP 072026
SVRCTP
PAC027-035-037-081-093-097-109-113-119-072130-
/O.NEW.KCTP.SV.W.0097.120707T2026Z-120707T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
426 PM EDT SAT JUL 7 2012

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COLUMBIA COUNTY IN CENTRAL PENNSYLVANIA...
  MONTOUR COUNTY IN CENTRAL PENNSYLVANIA...
  NORTHERN SNYDER COUNTY IN CENTRAL PENNSYLVANIA...
  SOUTHERN SULLIVAN COUNTY IN NORTH CENTRAL PENNSYLVANIA...
  UNION COUNTY IN CENTRAL PENNSYLVANIA...
  NORTHUMBERLAND COUNTY IN CENTRAL PENNSYLVANIA...
  NORTHEASTERN CENTRE COUNTY IN CENTRAL PENNSYLVANIA...
  SOUTHERN LYCOMING COUNTY IN NORTH CENTRAL PENNSYLVANIA...
  SOUTHERN CLINTON COUNTY IN NORTH CENTRAL PENNSYLVANIA...

* UNTIL 530 PM EDT

* AT 423 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  KASSON BROOK TO MUNCY VALLEY TO MUNCY TO MCELHATTAN TO KEATING...
  MOVING SOUTHEAST AT 30 MPH. THESE STORMS ARE CAPABLE OF PRODUCING
  QUARTER SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MONTGOMERY AND LAIRDSVILLE AROUND 435 PM EDT...
  ELIMSPORT AND MILL HALL AROUND 440 PM EDT...
  BALD EAGLE STATE PARK AND FAIRMOUNT SPRINGS AROUND 445 PM EDT...
  MACKEYVILLE AND CARROLL AROUND 450 PM EDT...
  NEW COLUMBIA AROUND 455 PM EDT...
  LAMAR AND SPRUCE RUN RESERVOIR AROUND 500 PM EDT...

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...
I-80 BETWEEN MILE MARKERS 165 AND 247...I-180 BETWEEN MILE MARKERS 1
AND 29.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...STATE HIGHWAY
147...ROUTE 11...ROUTE 11/15...ROUTE 15...ROUTE 220...ROUTE 522...
STATE ROAD 45...STATE ROAD 61...STATE ROAD 118...STATE ROAD 120.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF SEVERE THUNDERSTORMS HAS ALREADY MADE WIND DAMAGE AND
LARGE HAIL.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM ON THE
LOWEST FLOOR.

SEVERE THUNDERSTORMS PRODUCE DAMAGE. MOVE INSIDE A PERMANENT BUILDING
NOW TO BE SAFE FROM STRONG WIND GUSTS AND LARGE HAIL.

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1 8 7 7 6 3 3 6 7 7 2.

&&

LAT...LON 4088 7629 4080 7630 4078 7635 4075 7736
      4084 7736 4081 7747 4125 7802 4130 7690
      4155 7623 4153 7621 4131 7631 4121 7632
      4114 7627 4114 7622 4095 7621
TIME...MOT...LOC 2026Z 317DEG 28KT 4144 7624 4133 7653
          4123 7681 4120 7737 4119 7781

$$

FORECASTER: LA CORTE
1 follow-up statement
685 
WWUS51 KCTP 072057
SVSCTP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
457 PM EDT SAT JUL 7 2012

PAC081-113-072106-
/O.CAN.KCTP.SV.W.0097.000000T0000Z-120707T2130Z/
SULLIVAN PA-LYCOMING PA-
457 PM EDT SAT JUL 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN LYCOMING AND SOUTHERN
SULLIVAN COUNTIES IS CANCELLED...

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT
OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.

LAT...LON 4088 7629 4080 7630 4078 7636 4075 7735
      4085 7737 4081 7748 4106 7778 4103 7729
      4107 7660 4119 7631 4114 7627 4114 7622
      4096 7621
TIME...MOT...LOC 2056Z 317DEG 28KT 4118 7611 4100 7651
          4096 7720 4100 7776

$$

PAC027-035-037-093-097-109-119-072130-
/O.CON.KCTP.SV.W.0097.000000T0000Z-120707T2130Z/
COLUMBIA PA-MONTOUR PA-SNYDER PA-UNION PA-NORTHUMBERLAND PA-CENTRE 
PA-CLINTON PA-
457 PM EDT SAT JUL 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHEASTERN CLINTON...EAST CENTRAL CENTRE...CENTRAL
NORTHUMBERLAND...UNION...NORTHERN SNYDER...MONTOUR AND COLUMBIA
COUNTIES...

AT 452 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A LINE OF SEVERE THUNDERSTORMS WITH A HISTORY OF PRODUCING 
WIND DAMAGE AND LARGE HAIL. THESE STORMS WERE LOCATED ALONG A 
LINE EXTENDING FROM 12 MILES NORTHEAST OF BERWICK TO BLOOMSBURG TO 
R.B. WINTER STATE PARK TO 6 MILES WEST OF BALD EAGLE STATE 
PARK...MOVING SOUTHEAST AT 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
REBERSBURG AND MIFFLINBURG AROUND 505 PM EDT...
WINFIELD AND NEW BERLIN AROUND 510 PM EDT...
MILLHEIM AND WEIKERT AROUND 515 PM EDT...
POE VALLEY STATE PARK AND STONINGTON AROUND 520 PM EDT...

THIS WILL IMPACT I-80 BETWEEN MILE MARKERS 164 AND 247.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...STATE HIGHWAY
147...ROUTE 11...ROUTE 11/15...ROUTE 15...ROUTE 220...ROUTE 522...
STATE ROAD 45...STATE ROAD 61.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED WEAK ROTATION WITHIN THE LINE OF STORMS. 
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY DEVELOP. IF A TORNADO 
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY 
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE...AND STAY AWAY FROM
WINDOWS.

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1 8 7 7 6 3 3 6 7 7 2.

&&

LAT...LON 4088 7629 4080 7630 4078 7636 4075 7735
      4085 7737 4081 7748 4106 7778 4103 7729
      4107 7660 4119 7631 4114 7627 4114 7622
      4096 7621
TIME...MOT...LOC 2056Z 317DEG 28KT 4118 7611 4100 7651
          4096 7720 4100 7776

$$

FORECASTER: LA CORTE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 11:02 AM EDTSpecial Weather StatementCTPTioga88 min
Jul 7, 11:36 AM EDTSevere Thunderstorm WarningCTPTioga39 min
Jul 7, 1:52 PM EDTSpecial Weather StatementCTPMcKean, Potter, Tioga83 min
Jul 7, 2:24 PM EDTSevere Thunderstorm WarningCTPCameron, Elk, McKean, Potter, Tioga, Warren66 min
Jul 7, 3:26 PM EDTSevere Thunderstorm WarningCTPCameron, Centre, Clinton, Lycoming, Potter, Sullivan and 1 more64 min
Jul 7, 4:37 PM EDTSpecial Weather StatementCTPCentre, Clearfield38 min
Jul 7, 4:50 PM EDTSevere Thunderstorm WarningCTPCentre, Clearfield, Clinton, Huntingdon, Mifflin, Snyder55 min
Jul 7, 5:10 PM EDTSpecial Weather StatementCTPCambria35 min
Jul 7, 5:10 PM EDTSevere Thunderstorm WarningCTPColumbia, Northumberland, Schuylkill50 min
Jul 7, 5:23 PM EDTSevere Thunderstorm WarningCTPBedford, Blair, Cambria, Huntingdon52 min
Jul 7, 5:27 PM EDTSpecial Weather StatementCTPDauphin, Juniata, Lebanon, Northumberland, Perry, Snyder63 min
Jul 7, 5:34 PM EDTSpecial Weather StatementCTPClinton41 min
Jul 7, 5:52 PM EDTSpecial Weather StatementCTPClearfield53 min
Jul 7, 6:00 PM EDTSevere Thunderstorm WarningCTPClearfield44 min
Jul 7, 6:14 PM EDTSpecial Weather StatementCTPHuntingdon61 min
Jul 7, 6:21 PM EDTSevere Thunderstorm WarningCTPDauphin, Juniata, Perry39 min
Jul 7, 6:21 PM EDTSevere Thunderstorm WarningCTPCumberland, Franklin, Huntingdon, Juniata, Perry39 min
Jul 7, 6:21 PM EDTSevere Thunderstorm WarningCTPLancaster, Lebanon72 min
Jul 7, 6:40 PM EDTSpecial Weather StatementCTPCentre20 min
Jul 7, 6:41 PM EDTSpecial Weather StatementCTPCentre19 min
Jul 7, 6:57 PM EDTSpecial Weather StatementCTPCentre18 min
Jul 7, 6:59 PM EDTSevere Thunderstorm WarningCTPCumberland, Franklin, Juniata, Perry, York61 min
Jul 7, 7:51 PM EDTSevere Thunderstorm WarningCTPCumberland, Dauphin, Lancaster, Lebanon, Perry, York69 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2012Every severe thunderstorm warning in 2012

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.