Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 20, NWS State College, PA

April 25, 20105 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Apr 25, 2010, 6:01 PM EDT for 5 counties in Pennsylvania. It was in force for 59 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: Apr 25, 2010, 6:01 PM EDT (22:01 UTC)
Expired: Apr 25, 2010, 7:00 PM EDT
In force: 59 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Cumberland County, PA, Franklin County, PA, Huntingdon County, PA, Juniata County, PA, Perry County, PA

The radar

The State College radar (KCCX), 81 km from the middle of the area, began a volume at 22:05 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
Apr 25, 4:37 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.0 hours before the alert went out and 149 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 455 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 297 m²/s²
0-3 km storm-relative helicity: 354 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 Apr 25, 5:51 PM EDT, 10 minutes earlier.

Area forecast discussion, Apr 25, 5:51 PM EDT, 10 minutes before

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Hazardous weather outlook, Apr 25, 5:44 PM EDT, 17 minutes before

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In the hours before

Special weather statement, Apr 25, 3:09 PM EDT, 2 hours 52 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
309 PM EDT SUN APR 25 2010

PAZ024-251945-
CAMBRIA PA-
309 PM EDT SUN APR 25 2010

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN CAMBRIA COUNTY
THROUGH 345 PM EDT...

AT 304 PM EDT...A STRONG THUNDERSTORM WAS NEAR JOHNSTOWN...MOVING
NORTHEAST AT 25 MPH.

BRIEF WIND GUSTS TO 45 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS
STORM. THIS STORM WILL BE NEAR SOUTH FORK AROUND 320 PM...VINCO
AROUND 325 PM AND NANTY-GLO AROUND 330 PM.

THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...THE JOHNSTOWN
EXPRESSWAY...ROUTE 22...ROUTE 219...STATE ROAD 56.

LAT...LON 4051 7889 4042 7867 4025 7888 4026 7890
      4027 7890 4029 7893 4029 7900 4031 7902

EXPERIMENTAL

FORECASTER: LAMBERT

Local storm report, Apr 25, 4:22 PM EDT, 1 hour 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
422 PM EDT SUN APR 25 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0420 PM     HAIL             EBENSBURG               40.49N 78.73W
04/25/2010  E1.00 INCH       CAMBRIA            PA   LAW ENFORCEMENT

&&

CJE

Special weather statement, Apr 25, 4:50 PM EDT, 1 hour 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
450 PM EDT SUN APR 25 2010

PAZ019-045-046-049-252115-
SOUTHERN CENTRE PA-SOUTHERN CLINTON PA-SOUTHERN LYCOMING PA-UNION PA-
450 PM EDT SUN APR 25 2010

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL UNION...EAST CENTRAL
CENTRE...SOUTH CENTRAL LYCOMING AND SOUTHEASTERN CLINTON COUNTIES...

AT 446 PM EDT...A STRONG THUNDERSTORM WAS 14 MILES EAST OF
BELLEFONTE...MOVING NORTHEAST AT 30 MPH.

VERY HEAVY RAIN AND PENNY SIZE HAIR ARE POSSIBLE FROM THIS
STORM...AND WILL CAUSE WATER TO POND ON ROADS AND FILL POOR DRAINAGE
AREAS. THE RAIN WILL CAUSE RAPID RISES ON SMALL STREAMS AND CREEKS.
THIS STORM WILL BE NEAR LAMAR AROUND 455 PM...MACKEYVILLE AROUND 505
PM AND LOGANTON AROUND 515 PM.

THIS WILL IMPACT I-80 BETWEEN MILE MARKERS 176 AND 197.

LAT...LON 4118 7720 4099 7704 4080 7752 4095 7764

EXPERIMENTAL

FORECASTER: LA CORTE

Special weather statement, Apr 25, 5:31 PM EDT, 30 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
Apr 25, 3:09 PM EDT	Special Weather Statement	CTP	Cambria	36 min
Apr 25, 3:49 PM EDT	Areal Flood Advisory	CTP	Cambria, Somerset	3 hr
Apr 25, 3:50 PM EDT	Severe Thunderstorm Warning	CTP	Cambria	55 min
Apr 25, 3:55 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	65 min
Apr 25, 4:16 PM EDT	Flash Flood Warning	CTP	Cambria, Somerset	3 hr
Apr 25, 4:40 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria, Centre, Huntingdon	65 min
Apr 25, 4:50 PM EDT	Special Weather Statement	CTP	Union	25 min
Apr 25, 4:54 PM EDT	Areal Flood Advisory	CTP	Blair, Centre, Huntingdon	3 hr
Apr 25, 5:04 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria, Huntingdon, Somerset	56 min
Apr 25, 5:12 PM EDT	Tornado Warning	CTP	Bedford, Blair	33 min
Apr 25, 5:31 PM EDT	Special Weather Statement	CTP	Union	29 min
Apr 25, 6:12 PM EDT	Special Weather Statement	CTP	Huntingdon	33 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010 Every severe thunderstorm warning in 2010

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.