Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 201, NWS State College, PA

August 14, 2012Juniata County, Snyder County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 14, 2012, 8:38 PM EDT for Juniata County, Snyder County, Pennsylvania. It was in force for 37 min. 2 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
Aug 14, 2012, 8:38 PM EDT (00:38 UTC)
Expired
Aug 14, 2012, 9:15 PM EDT
In force
37 min
Issued by
NWS State College, PA
Area
Storm-based polygon

Counties Juniata County, PA, Snyder County, PA

The radar

The State College radar (KCCX), 75 km from the middle of the area, began a volume at 00:39 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
Aug 14, 8:55 PM EDTHAIL 0.88Oakland Mills, PA
Aug 14, 9:15 PM EDTTSTM WND DMGMifflintown, PATREE ON HOUSE IN MIFFLINTOWN AND NUMEROUS TREES DOWN IN AREA SURROUNDING MIFFLINTOWN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.6 hours before the alert went out and 183 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 2012-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 833 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 2012-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.19395878Sfc1 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
833 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
1690 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

900 
WUUS51 KCTP 150038
SVRCTP
PAC067-109-150115-
/O.NEW.KCTP.SV.W.0201.120815T0038Z-120815T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
838 PM EDT TUE AUG 14 2012

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN JUNIATA COUNTY IN CENTRAL PENNSYLVANIA...
  SOUTHERN SNYDER COUNTY IN CENTRAL PENNSYLVANIA...

* UNTIL 915 PM EDT

* AT 835 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR MIFFLINTOWN...MOVING
  EAST AT 20 MPH. THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL. 

* LOCATIONS IN THE WARNING INCLUDE...
  MCALISTERVILLE...
  RICHFIELD AND FREMONT...

THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11/15...ROUTE
322/22...ROUTE 522.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGE. MOVE INSIDE A PERMANENT BUILDING
NOW TO BE SAFE FROM 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 4051 7745 4062 7747 4063 7746 4080 7697
      4064 7693 4061 7702 4058 7718 4056 7717
      4055 7718 4053 7725
TIME...MOT...LOC 0037Z 260DEG 16KT 4063 7737

$$

FORECASTER: DANGELO
1 follow-up statement
886 
WWUS51 KCTP 150053
SVSCTP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
853 PM EDT TUE AUG 14 2012

PAC067-109-150115-
/O.CON.KCTP.SV.W.0201.000000T0000Z-120815T0115Z/
JUNIATA PA-SNYDER PA-
853 PM EDT TUE AUG 14 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR SNYDER AND JUNIATA COUNTIES...

AT 849 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE 
HAIL AND WIND GUSTS TO 60 MPH. THIS STORM WAS LOCATED NEAR 
MCALISTERVILLE...OR 14 MILES EAST OF LEWISTOWN...MOVING EAST AT 20 
MPH.

LOCATIONS INCLUDED THE WARNING INCLUDE...

  MCALISTERVILLE...RICHFIELD...FREMONT...MEISERVILLE AND
  THOMPSONTOWN.

THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11/15 NEAR THE
JUNIATA SNYDER COUNTY LINE...ROUTE 322/22 FROM NEAR MIFFLINTOWN TO
EAST OF THOMPSONTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED WEAK ROTATION WITHIN THIS STORM. 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.

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 4051 7745 4062 7747 4063 7746 4080 7697
      4064 7693 4061 7702 4058 7718 4056 7717
      4055 7718 4053 7725
TIME...MOT...LOC 0053Z 260DEG 16KT 4062 7729

$$

FORECASTER: DANGELO

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 8:05 PM EDTSpecial Weather StatementCTPSchuylkill25 min
Aug 14, 8:09 PM EDTSpecial Weather StatementCTPDauphin36 min
Aug 14, 8:17 PM EDTSpecial Weather StatementCTPAdams28 min
Aug 14, 8:21 PM EDTSpecial Weather StatementCTPJuniata24 min
Aug 14, 8:25 PM EDTSpecial Weather StatementCTPClinton35 min
Aug 14, 8:29 PM EDTSpecial Weather StatementCTPFranklin, Fulton31 min
Aug 14, 9:01 PM EDTSevere Thunderstorm WarningCTPJuniata, Perry59 min
Aug 14, 9:02 PM EDTSpecial Weather StatementCTPFranklin58 min
Aug 14, 9:24 PM EDTAreal Flood AdvisoryCTPJuniata, Perry, Snyder3 hr
Aug 14, 9:25 PM EDTSpecial Weather StatementCTPAdams35 min
Aug 14, 9:31 PM EDTSpecial Weather StatementCTPCumberland44 min
Aug 14, 9:33 PM EDTSevere Thunderstorm WarningCTPAdams, Cumberland, Franklin57 min
Aug 14, 9:56 PM EDTSpecial Weather StatementCTPDauphin34 min
Aug 14, 10:12 PM EDTFlash Flood WarningCTPCumberland, Dauphin, Perry3 hr
Aug 14, 10:43 PM EDTSpecial Weather StatementCTPDauphin, Lebanon, York62 min
Aug 14, 11:50 PM EDTSpecial Weather StatementCTPLancaster40 min
Aug 15, 6:12 PM EDTSpecial Weather StatementCTPCameron63 min
Aug 15, 6:42 PM EDTSpecial Weather StatementCTPMifflin33 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.