Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 171, NWS State College, PA

August 16, 2010Dauphin County, Lebanon County, Schuylkill County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 16, 2010, 3:08 PM EDT for Dauphin County, Lebanon County, Schuylkill County, Pennsylvania. It was in force for 67 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
Aug 16, 2010, 3:08 PM EDT (19:08 UTC)
Expired
Aug 16, 2010, 4:15 PM EDT
In force
67 min
Issued by
NWS State College, PA
Area
Storm-based polygon

Counties Dauphin County, PA, Lebanon County, PA, Schuylkill County, PA

The radar

The State College radar (KCCX), 137 km from the middle of the area, began a volume at 19:11 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
Aug 16, 12:05 PM EDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.1 hours before the alert went out and 119 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, Phillips Aaf/Abe, MD at 12:00Z on 2010-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 501 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, Phillips Aaf/Abe, MD at 12:00Z on 2010-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 square meters per square second.193958Sfc1 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
501 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
538 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
94 m²/s²
Significant tornado parameter
0.2
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 Aug 16, 1:15 PM EDT, 1 hour 53 minutes earlier.

Area forecast discussion, Aug 16, 1:15 PM EDT, 1 hour 53 minutes before
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Hazardous weather outlook, Aug 16, 1:29 PM EDT, 1 hour 39 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
129 PM EDT MON AUG 16 2010

PAZ004>006-010>012-017>019-024>027-033>035-037-041-042-045-046-
171730-
WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD-
NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN-
SOMERSET-BEDFORD-FULTON-TIOGA-NORTHERN LYCOMING-SULLIVAN-
SOUTHERN CLINTON-SOUTHERN LYCOMING-
129 PM EDT MON AUG 16 2010

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...TUESDAY THROUGH SUNDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ028-036-049>053-056>059-063>066-171730-
JUNIATA-FRANKLIN-UNION-SNYDER-MONTOUR-NORTHUMBERLAND-COLUMBIA-PERRY-
DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-ADAMS-YORK-LANCASTER-
129 PM EDT MON AUG 16 2010

...SEVERE THUNDERSTORM WATCH 619 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO
WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE
INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Aug 16, 12:59 PM EDT, 2 hours 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1259 PM EDT MON AUG 16 2010

PAZ051>053-161745-
COLUMBIA PA-MONTOUR PA-NORTHUMBERLAND PA-
1259 PM EDT MON AUG 16 2010

...A STRONG THUNDERSTORM WILL AFFECT MONTOUR...NORTHERN
NORTHUMBERLAND AND WEST CENTRAL COLUMBIA COUNTIES...

AT 1256 PM EDT...A STRONG THUNDERSTORM WAS NEAR MILTON...MOVING EAST
AT 20 MPH.

WIND GUSTS TO 50 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL BE NEAR MOORESBURG AROUND 120 PM...DANVILLE AROUND
130 PM...MECHANICSVILLE AROUND 140 PM AND BLOOMSBURG AROUND 150 PM.

THIS WILL IMPACT I-80 BETWEEN MILE MARKERS 213 AND 235. THIS WILL
ALSO IMPACT THE FOLLOWING MAJOR ROADS...STATE HIGHWAY 147 FROM I-80
TO MILTON...ROUTE 11 FROM EAST OF NORTHUMBERLAND TO WEST OF
BLOOMSBURG.

LAT...LON 4084 7653 4095 7688 4097 7688 4100 7686
      4103 7686 4111 7675 4107 7641

FORECASTER: DANGELO
Special weather statement, Aug 16, 2:40 PM EDT, 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
240 PM EDT MON AUG 16 2010

PAZ057-161930-
DAUPHIN PA-
240 PM EDT MON AUG 16 2010

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN DAUPHIN COUNTY...

AT 237 PM EDT...A STRONG THUNDERSTORM WAS NEAR MILLERSBURG...MOVING
EAST AT 20 MPH.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM. VERY HEAVY RAIN
WILL FALL 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 ELIZABETHVILLE AROUND 300
PM...LYKENS AROUND 320 PM AND WILLIAMSTOWN AROUND 330 PM.

THIS WILL IMPACT ROUTE 209 FROM MILLERSBURG TO NEAR WILLIAMSTOWN.

LAT...LON 4042 7676 4052 7698 4061 7695 4065 7670
      4056 7655

FORECASTER: DANGELO
Special weather statement, Aug 16, 2:51 PM EDT, 17 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
251 PM EDT MON AUG 16 2010

PAZ035-036-161915-
FRANKLIN PA-FULTON PA-
251 PM EDT MON AUG 16 2010

...STRONG THUNDERSTORMS WILL AFFECT FRANKLIN AND SOUTHERN FULTON
COUNTIES...

AN AREA OF STRONG THUNDERSTORMS COVERED SOUTHERN FRANKLIN AND FULTON
COUNTIES AT 250 PM EDT. THE STRONG THUNDERSTORMS WERE GENERALLY
MOVING EAST AT 30 MPH.

WIND GUSTS TO 45 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THESE STRONG
THUNDERSTORMS. VERY HEAVY RAIN WILL FALL FROM THESE STRONG
THUNDERSTORMS...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 WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...
I-70 BETWEEN MILE MARKERS 163 AND 170...I-81 BETWEEN MILE MARKERS 1
AND 22.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11 FROM THE
MARYLAND BORDER TO NORTH OF CHAMBERSBURG...ROUTE 522 FROM THE
MARYLAND BORDER TO NORTH OF MCCONNELLSBURG...ROUTE 30 FROM WEST OF
MCCONNELLSBURG TO FAYETTEVILLE.

LAT...LON 4000 7750 3973 7747 3973 7835 4001 7802

FORECASTER: DANGELO

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 4:21 AM EDTSpecial Weather StatementCTPClearfield54 min
Aug 16, 6:03 AM EDTSpecial Weather StatementCTPCentre57 min
Aug 16, 12:59 PM EDTSpecial Weather StatementCTPMontour46 min
Aug 16, 2:40 PM EDTSpecial Weather StatementCTPDauphin50 min
Aug 16, 2:51 PM EDTSpecial Weather StatementCTPFranklin, Fulton24 min
Aug 16, 3:19 PM EDTSpecial Weather StatementCTPAdams, Cumberland56 min
Aug 16, 3:28 PM EDTSevere Thunderstorm WarningCTPCumberland, York62 min
Aug 16, 3:43 PM EDTTornado WarningCTPLebanon47 min
Aug 16, 3:49 PM EDTSevere Thunderstorm WarningCTPAdams, York58 min
Aug 16, 4:12 PM EDTSevere Thunderstorm WarningCTPCumberland, Dauphin, Lancaster, Lebanon, York63 min
Aug 16, 4:20 PM EDTSevere Thunderstorm WarningCTPLancaster, Lebanon55 min
Aug 16, 4:30 PM EDTSevere Thunderstorm WarningCTPDauphin, Lebanon46 min
Aug 16, 5:05 PM EDTTornado WarningCTPLancaster25 min
Aug 16, 5:13 PM EDTSpecial Weather StatementCTPLebanon32 min
Aug 16, 5:18 PM EDTSpecial Weather StatementCTPFranklin27 min
Aug 16, 5:31 PM EDTSpecial Weather StatementCTPLancaster14 min
Aug 16, 5:37 PM EDTSevere Thunderstorm WarningCTPLancaster63 min
Aug 16, 7:24 PM EDTSpecial Weather StatementCTPAdams66 min
Aug 16, 7:39 PM EDTSpecial Weather StatementCTPYork66 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010Every 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.