Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 80, NWS State College, PA

June 30, 2009Lycoming County, Tioga County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 30, 2009, 4:50 PM EDT for Lycoming County, Tioga County, Pennsylvania. It was in force for 55 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 30, 2009, 4:50 PM EDT (20:50 UTC)
Expired
Jun 30, 2009, 5:45 PM EDT
In force
55 min
Issued by
NWS State College, PA
Area
Storm-based polygon

Counties Lycoming County, PA, Tioga County, PA

The radar

The State College radar (KCCX), 100 km from the middle of the area, began a volume at 20:52 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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.8 hours before the alert went out and 198 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 2009-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 229 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, Buffalo Intl Airport, NY at 12:00Z on 2009-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
229 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
573 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS State College, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 30, 4:06 PM EDT, 44 minutes earlier.

Area forecast discussion, Jun 30, 4:06 PM EDT, 44 minutes before
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Hazardous weather outlook, Jun 30, 11:56 AM EDT, 4 hours 54 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1156 AM EDT TUE JUN 30 2009

PAZ004>006-010>012-017>019-024>028-033>037-045-049-050-056-057-
063>065-011600-
WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD-
NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN-
JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN-TIOGA-SOUTHERN CLINTON-
UNION-SNYDER-PERRY-DAUPHIN-CUMBERLAND-ADAMS-YORK-
1156 AM EDT TUE JUN 30 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ041-042-046-051>053-058-059-066-011600-
NORTHERN LYCOMING-SULLIVAN-SOUTHERN LYCOMING-MONTOUR-NORTHUMBERLAND-
COLUMBIA-SCHUYLKILL-LEBANON-LANCASTER-
1156 AM EDT TUE JUN 30 2009

...SLIGHT RISK OF SEVERE THUNDERSTORMS...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
INTO TONIGHT. THE PRIMARY SEVERE WEATHER THREATS WILL BE LARGE
HAIL AND DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

STEINBUGL

In the hours before

Special weather statement, Jun 30, 2:14 PM EDT, 2 hours 36 minutes before
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Local storm report, Jun 30, 2:26 PM EDT, 2 hours 24 minutes before
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Special weather statement, Jun 30, 2:34 PM EDT, 2 hours 16 minutes before
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Special weather statement, Jun 30, 3:22 PM EDT, 1 hour 28 minutes before
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Special weather statement, Jun 30, 4:07 PM EDT, 43 minutes before
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Special weather statement, Jun 30, 4:41 PM EDT, 9 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 10:35 PM EDTSpecial Weather StatementCTPTioga25 min
Jun 30, 7:47 AM EDTSpecial Weather StatementCTPColumbia, Montour73 min
Jun 30, 8:59 AM EDTSpecial Weather StatementCTPSullivan61 min
Jun 30, 10:06 AM EDTSpecial Weather StatementCTPUnion54 min
Jun 30, 10:10 AM EDTSpecial Weather StatementCTPSnyder35 min
Jun 30, 10:52 AM EDTSpecial Weather StatementCTPColumbia, Montour53 min
Jun 30, 10:54 AM EDTSpecial Weather StatementCTPColumbia, Montour51 min
Jun 30, 11:13 AM EDTSpecial Weather StatementCTPHuntingdon47 min
Jun 30, 11:15 AM EDTSevere Thunderstorm WarningCTPColumbia, Montour, Northumberland, Schuylkill60 min
Jun 30, 11:59 AM EDTSpecial Weather StatementCTPAdams61 min
Jun 30, 12:07 PM EDTSpecial Weather StatementCTPHuntingdon53 min
Jun 30, 12:21 PM EDTSpecial Weather StatementCTPDauphin, Lebanon, York69 min
Jun 30, 12:27 PM EDTSevere Thunderstorm WarningCTPCumberland, Dauphin, Lancaster, Lebanon, York78 min
Jun 30, 12:36 PM EDTSpecial Weather StatementCTPFranklin39 min
Jun 30, 12:39 PM EDTSevere Thunderstorm WarningCTPAdams, Lancaster, York81 min
Jun 30, 12:51 PM EDTSevere Thunderstorm WarningCTPFranklin54 min
Jun 30, 12:57 PM EDTSpecial Weather StatementCTPSchuylkill33 min
Jun 30, 12:59 PM EDTSpecial Weather StatementCTPCumberland46 min
Jun 30, 1:14 PM EDTSevere Thunderstorm WarningCTPDauphin, Lancaster, Lebanon, Schuylkill76 min
Jun 30, 1:18 PM EDTSpecial Weather StatementCTPCameron, Elk27 min
Jun 30, 1:26 PM EDTAreal Flood AdvisoryCTPCameron, Elk3 hr
Jun 30, 1:31 PM EDTSpecial Weather StatementCTPSchuylkill29 min
Jun 30, 1:41 PM EDTSpecial Weather StatementCTPLancaster79 min
Jun 30, 1:54 PM EDTSevere Thunderstorm WarningCTPLancaster, Lebanon, York66 min
Jun 30, 2:05 PM EDTSevere Thunderstorm WarningCTPAdams40 min
Jun 30, 2:14 PM EDTSpecial Weather StatementCTPSchuylkill46 min
Jun 30, 2:34 PM EDTSpecial Weather StatementCTPYork26 min
Jun 30, 3:22 PM EDTSpecial Weather StatementCTPTioga38 min
Jun 30, 4:07 PM EDTSpecial Weather StatementCTPLycoming38 min
Jun 30, 4:41 PM EDTSpecial Weather StatementCTPLycoming34 min
Jun 30, 5:37 PM EDTSpecial Weather StatementCTPMontour23 min
Jun 30, 6:05 PM EDTSpecial Weather StatementCTPSullivan25 min
Jun 30, 6:13 PM EDTSpecial Weather StatementCTPJuniata, Mifflin32 min
Jun 30, 6:30 PM EDTSpecial Weather StatementCTPNorthumberland30 min
Jun 30, 6:59 PM EDTSpecial Weather StatementCTPSchuylkill31 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2009Every severe thunderstorm warning in 2009

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.