Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 76, NWS State College, PA

June 29, 2012Lancaster County, York County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 29, 2012, 4:49 AM EDT for Lancaster County, York County, Pennsylvania. It was in force for 16 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
Jun 29, 2012, 4:49 AM EDT (08:49 UTC)
Expired
Jun 29, 2012, 5:05 AM EDT
In force
16 min
Issued by
NWS State College, PA
Area
Storm-based polygon

Counties Lancaster County, PA, York County, PA

The radar

The Dover AFB radar (KDOX), 129 km from the middle of the area, began a volume at 08:51 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 8.8 hours before the alert went out and 139 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 2012-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2012-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 132 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2494 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
132 m²/s²
0-3 km storm-relative helicity
317 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.

281 
WUUS51 KCTP 290849
SVRCTP
PAC071-133-290930-
/O.NEW.KCTP.SV.W.0076.120629T0849Z-120629T0930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
449 AM EDT FRI JUN 29 2012

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN LANCASTER COUNTY IN SOUTH CENTRAL PENNSYLVANIA...
  SOUTHEASTERN YORK COUNTY IN SOUTH CENTRAL PENNSYLVANIA...

* UNTIL 530 AM EDT

* AT 441 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  WINDSOR TO BENTLEY SPRINGS...MOVING SOUTHEAST AT 40 MPH. THESE
  STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  SHENKS FERRY...
  SUNNYBURN...
  HOLTWOOD...
  DELTA...
  WAKEFIELD...

THIS WILL IMPACT I-83 BETWEEN MILE MARKERS 1 AND 4.

THIS WILL ALSO IMPACT ROUTE 222.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3991 7657 3988 7598 3985 7601 3983 7601
      3982 7603 3979 7604 3972 7610 3971 7624
      3972 7673
TIME...MOT...LOC 0849Z 293DEG 33KT 3986 7648 3965 7667

$$

FORECASTER: DEVOIR
1 follow-up statement
624 
WWUS51 KCTP 290905
SVSCTP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
505 AM EDT FRI JUN 29 2012

PAC071-133-290915-
/O.CAN.KCTP.SV.W.0076.000000T0000Z-120629T0930Z/
LANCASTER PA-YORK PA-
505 AM EDT FRI JUN 29 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN YORK AND
SOUTHEASTERN LANCASTER COUNTIES IS CANCELLED...

THE STORM HAS WEAKENED TO BELOW SEVERE LIMITS...THEREFORE THE SEVERE
THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3991 7657 3988 7598 3985 7601 3983 7601
      3982 7603 3979 7604 3972 7610 3971 7624
      3972 7673
TIME...MOT...LOC 0905Z 293DEG 33KT 3980 7630 3959 7650

$$

FORECASTER: CERU

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 12:19 AM EDTSevere Thunderstorm WarningCTPWarren41 min
Jun 29, 12:41 AM EDTSpecial Weather StatementCTPElk49 min
Jun 29, 1:02 AM EDTSevere Thunderstorm WarningCTPWarren58 min
Jun 29, 1:37 AM EDTSpecial Weather StatementCTPMcKean38 min
Jun 29, 1:46 AM EDTSpecial Weather StatementCTPElk29 min
Jun 29, 1:54 AM EDTSpecial Weather StatementCTPPotter36 min
Jun 29, 1:58 AM EDTSpecial Weather StatementCTPClearfield32 min
Jun 29, 2:24 AM EDTSpecial Weather StatementCTPCentre, Clearfield51 min
Jun 29, 2:27 AM EDTSpecial Weather StatementCTPPotter48 min
Jun 29, 2:31 AM EDTSpecial Weather StatementCTPBlair44 min
Jun 29, 2:54 AM EDTSevere Thunderstorm WarningCTPCentre, Clinton, Huntingdon, Juniata, Mifflin, Perry and 2 more51 min
Jun 29, 3:11 AM EDTSpecial Weather StatementCTPBlair, Franklin, Huntingdon, Mifflin, Perry34 min
Jun 29, 3:14 AM EDTSpecial Weather StatementCTPSullivan, Tioga31 min
Jun 29, 3:46 AM EDTSpecial Weather StatementCTPAdams, Cumberland, Dauphin, Franklin, Lancaster, Perry and 1 more29 min
Jun 29, 3:48 AM EDTSpecial Weather StatementCTPSchuylkill27 min
Jun 29, 4:12 AM EDTSevere Thunderstorm WarningCTPDauphin, Lancaster, Lebanon, Northumberland, Schuylkill48 min
Jun 29, 4:14 AM EDTSevere Thunderstorm WarningCTPAdams, Cumberland, Franklin, York50 min
Jun 29, 4:43 AM EDTSpecial Weather StatementCTPLancaster32 min
Jun 29, 6:39 PM EDTSpecial Weather StatementCTPBedford66 min
Jun 29, 6:49 PM EDTSevere Thunderstorm WarningCTPBedford, Blair, Cambria, Somerset56 min
Jun 29, 7:28 PM EDTSpecial Weather StatementCTPHuntingdon62 min
Jun 29, 7:39 PM EDTSevere Thunderstorm WarningCTPBedford, Franklin, Fulton66 min
Jun 29, 7:41 PM EDTSevere Thunderstorm WarningCTPFranklin, Huntingdon49 min
Jun 29, 7:46 PM EDTFlash Flood WarningCTPBedford, Somerset3 hr
Jun 29, 7:54 PM EDTSpecial Weather StatementCTPBedford, Somerset81 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.