Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 204, NWS State College, PA

November 18, 20139 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Nov 18, 2013, 12:20 AM EST for 9 counties in Pennsylvania. It was in force for 70 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
Nov 18, 2013, 12:20 AM EST (05:20 UTC)
Expired
Nov 18, 2013, 1:30 AM EST
In force
70 min
Issued by
NWS State College, PA
Area
Storm-based polygon

Counties Centre County, PA, Clinton County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Snyder County, PA, Tioga County, PA, Union County, PA

The radar

The State College radar (KCCX), 68 km from the middle of the area, began a volume at 05:20 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.

IssuedProductOfficeLasted
Nov 17, 11:06 PM ESTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 5.3 hours before the alert went out and 235 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 2013-11-18Temperature 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 2013-11-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 308 square meters per square second.19395878Sfc1 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
697 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
308 m²/s²
0-3 km storm-relative helicity
340 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 Nov 18, 12:02 AM EST, 18 minutes earlier.

Area forecast discussion, Nov 18, 12:02 AM EST, 18 minutes before
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Hazardous weather outlook, Nov 17, 11:57 PM EST, 23 minutes before
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In the hours before

Special weather statement, Nov 17, 10:57 PM EST, 1 hour 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1057 PM EST SUN NOV 17 2013

PAZ005-006-180430-
MCKEAN PA-POTTER PA-
1057 PM EST SUN NOV 17 2013

...SHOWERS WITH STRONG WIND GUSTS WILL AFFECT EASTERN MCKEAN AND
NORTHWESTERN POTTER COUNTIES THROUGH 1230 AM EST...

AT 1055 PM EST...SHOWERS WITH STRONG WIND GUSTS WERE LOCATED FROM
BRADFORD TO KINZUA BRIDGE STATE PARK...MOVING EAST AT 65 MPH.

WESTERLY WIND GUSTS BETWEEN 45 AND 55 MPH ARE POSSIBLE WITH THESE
SHOWERS. THESE SHOWERS WILL AFFECT SHINGLEHOUSE...OSWAYO AND ULYSSES.

THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 6...STATE ROAD
46...STATE ROAD 59...STATE ROAD 446...STATE ROAD 449.

LAT...LON 4200 7771 4183 7778 4172 7858 4200 7861

FORECASTER: LAMBERT
Local storm report, Nov 17, 11:26 PM EST, 54 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1126 PM EST SUN NOV 17 2013

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

1051 PM     TSTM WND DMG     RIDGWAY                 41.43N  78.73W
11/17/2013                   ELK                PA   911 CALL CENTER

            TREES REPORTED DOWN COUNTYWIDE.

&&

EVENT NUMBER CTP1300507

EVANEGO
Local storm report, Nov 17, 11:40 PM EST, 40 minutes before
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Local storm report, Nov 17, 11:56 PM EST, 24 minutes before
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Local storm report, Nov 18, 12:12 AM EST, 8 minutes before
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Local storm report, Nov 18, 12:13 AM EST, 7 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Nov 17, 9:07 PM ESTSpecial Weather StatementCTPCambria23 min
Nov 17, 10:07 PM ESTSpecial Weather StatementCTPMcKean, Warren38 min
Nov 17, 10:24 PM ESTSevere Thunderstorm WarningCTPCameron, Elk, McKean, Potter81 min
Nov 17, 10:42 PM ESTSevere Thunderstorm WarningCTPCambria, Clearfield, Somerset63 min
Nov 17, 10:57 PM ESTSpecial Weather StatementCTPMcKean33 min
Nov 17, 11:38 PM ESTSevere Thunderstorm WarningCTPCameron, Centre, Clearfield, Clinton, Lycoming, Potter and 1 more52 min
Nov 17, 11:41 PM ESTSevere Thunderstorm WarningCTPBedford, Blair, Cambria, Clearfield, Franklin, Fulton and 3 more64 min
Nov 18, 12:36 AM ESTSevere Thunderstorm WarningCTPAdams, Cumberland, Franklin, Juniata, Mifflin, Perry and 1 more54 min
Nov 18, 1:09 AM ESTSevere Thunderstorm WarningCTPColumbia, Lycoming, Sullivan66 min
Nov 18, 1:22 AM ESTSevere Thunderstorm WarningCTPColumbia, Dauphin, Lycoming, Montour, Northumberland, Schuylkill53 min
Nov 18, 1:25 AM ESTSevere Thunderstorm WarningCTPDauphin, Lancaster, Lebanon, Schuylkill, York80 min
Nov 18, 1:56 AM ESTSpecial Weather StatementCTPLancaster, York49 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2013Every severe thunderstorm warning in 2013

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.