Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 20, NWS State College, PA

May 24, 2009Cumberland County, Juniata County, Perry County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at May 24, 2009, 7:04 PM EDT for Cumberland County, Juniata County, Perry County, Pennsylvania. It was in force for 56 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: May 24, 2009, 7:04 PM EDT (23:04 UTC)
Expired: May 24, 2009, 8:00 PM EDT
In force: 56 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Cumberland County, PA, Juniata County, PA, Perry County, PA

The radar

The State College radar (KCCX), 85 km from the middle of the area, began a volume at 23:06 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 12:00Z, 11.1 hours before the alert went out and 157 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 222 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 979 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 78 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 May 24, 4:02 PM EDT, 3 hours 2 minutes earlier.

Area forecast discussion, May 24, 4:02 PM EDT, 3 hours 2 minutes before

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Hazardous weather outlook, May 24, 7:39 AM EDT, 11 hours 25 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
739 AM EDT SUN MAY 24 2009

PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053-
056>059-063>066-251145-
WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD-
NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN-
JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING-
SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-
NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-
ADAMS-YORK-LANCASTER-
739 AM EDT SUN MAY 24 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

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, May 24, 4:39 PM EDT, 2 hours 25 minutes before

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Special weather statement, May 24, 4:58 PM EDT, 2 hours 6 minutes before

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Local storm report, May 24, 5:17 PM EDT, 1 hour 47 minutes before

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Special weather statement, May 24, 5:44 PM EDT, 1 hour 20 minutes before

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Special weather statement, May 24, 6:28 PM EDT, 36 minutes before

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Special weather statement, May 24, 6:53 PM EDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 10:38 PM EDT	Flash Flood Warning	CTP	Bedford, Fulton	3 hr
May 24, 2:45 PM EDT	Special Weather Statement	CTP	Lycoming	45 min
May 24, 3:09 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming	66 min
May 24, 3:34 PM EDT	Flash Flood Warning	CTP	Bedford	3 hr
May 24, 3:43 PM EDT	Special Weather Statement	CTP	Montour, Union	62 min
May 24, 3:54 PM EDT	Flash Flood Warning	CTP	Bedford, Somerset	3 hr
May 24, 4:20 PM EDT	Special Weather Statement	CTP	Snyder	40 min
May 24, 4:39 PM EDT	Special Weather Statement	CTP	Montour, Northumberland, Snyder	36 min
May 24, 4:58 PM EDT	Special Weather Statement	CTP	Juniata, Mifflin, Northumberland, Snyder	47 min
May 24, 4:59 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Mifflin	46 min
May 24, 5:44 PM EDT	Special Weather Statement	CTP	Huntingdon, Juniata, Perry, Schuylkill	46 min
May 24, 6:21 PM EDT	Areal Flood Advisory	CTP	Somerset	3 hr
May 24, 6:28 PM EDT	Special Weather Statement	CTP	Schuylkill	32 min
May 24, 6:53 PM EDT	Special Weather Statement	CTP	Cumberland, Lebanon	37 min
May 24, 7:34 PM EDT	Special Weather Statement	CTP	Cumberland	56 min
May 24, 7:48 PM EDT	Special Weather Statement	CTP	Huntingdon	57 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2009 Every 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.