Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 138, NWS State College, PA

July 27, 2008Lancaster County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 27, 2008, 4:52 PM EDT for Lancaster County, Pennsylvania. It was in force for 23 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: Jul 27, 2008, 4:52 PM EDT (20:52 UTC)
Expired: Jul 27, 2008, 5:15 PM EDT
In force: 23 min
Issued by: NWS State College, PA
Area: Storm-based polygon

County Lancaster County, PA

The radar

The Dover AFB radar (KDOX), 152 km from the middle of the area, began a volume at 20:56 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 27, 11:26 AM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.9 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: 1356 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1062 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

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 Jul 27, 3:47 PM EDT, 1 hour 5 minutes earlier.

Area forecast discussion, Jul 27, 3:47 PM EDT, 1 hour 5 minutes before

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Hazardous weather outlook, Jul 27, 3:50 AM EDT, 13 hours 2 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
350 AM EDT SUN JUL 27 2008

PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049-050-
280800-
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-
350 AM EDT SUN JUL 27 2008

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ051>053-056>059-063>066-280800-
MONTOUR-NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-
CUMBERLAND-ADAMS-YORK-LANCASTER-
350 AM EDT SUN JUL 27 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS TODAY. THE MAIN
THREATS WILL BE DAMAGING WIND GUSTS AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE.

In the hours before

Special weather statement, Jul 27, 11:13 AM EDT, 5 hours 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1113 AM EDT SUN JUL 27 2008

PAZ026-036-063-271545-
CUMBERLAND PA-FRANKLIN PA-HUNTINGDON PA-
1113 AM EDT SUN JUL 27 2008

...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL FRANKLIN...
SOUTHEASTERN HUNTINGDON AND WESTERN CUMBERLAND COUNTIES...

AT 1107 AM EDT...A STRONG THUNDERSTORM WAS LOCATED 15 MILES NORTHWEST
OF SHIPPENSBURG...MOVING EAST AT 28 MPH.

WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THIS
STORM.

THIS STORM WILL BE NEAR ROXBURY AROUND 1120 AM...ORRSTOWN AROUND 1125
AM...NEWBURG AROUND 1130 AM...SHIPPENSBURG AROUND 1135 AM AND
NEWVILLE AROUND 1145 AM.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 187 AND 222...I-70 BETWEEN
MILE MARKERS 187 AND 222.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11.

FORECASTER: DEVOIR

Special weather statement, Jul 27, 11:43 AM EDT, 5 hours 9 minutes before

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Local storm report, Jul 27, 1:14 PM EDT, 3 hours 38 minutes before

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Local storm report, Jul 27, 2:29 PM EDT, 2 hours 23 minutes before

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Special weather statement, Jul 27, 4:14 PM EDT, 38 minutes before

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Special weather statement, Jul 27, 4:36 PM EDT, 16 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
Jul 27, 11:17 AM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Franklin, Huntingdon	58 min
Jul 27, 11:46 AM EDT	Severe Thunderstorm Warning	CTP	Adams, York	59 min
Jul 27, 11:58 AM EDT	Severe Thunderstorm Warning	CTP	Lancaster, Lebanon	17 min
Jul 27, 12:00 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	60 min
Jul 27, 12:27 PM EDT	Tornado Warning	CTP	York	33 min
Jul 27, 12:33 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin, York	57 min
Jul 27, 12:36 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	24 min
Jul 27, 12:47 PM EDT	Tornado Warning	CTP	Adams, York	43 min
Jul 27, 12:54 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	66 min
Jul 27, 1:21 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Lancaster, York	52 min
Jul 27, 5:45 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	90 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2008 Every severe thunderstorm warning in 2008

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.