Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 72, NWS State College, PA

June 4, 2010Lancaster County, York County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 4, 2010, 3:17 PM EDT for Lancaster County, York County, Pennsylvania. It was in force for 42 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
Jun 4, 2010, 3:17 PM EDT (19:17 UTC)
Expired
Jun 4, 2010, 3:59 PM EDT
In force
42 min
Issued by
NWS State College, PA
Area
Storm-based polygon

Counties Lancaster County, PA, York County, PA

The radar

The Sterling radar (KLWX), 141 km from the middle of the area, began a volume at 19:17 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
Jun 4, 2:39 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.3 hours before the alert went out and 139 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 12:00Z on 2010-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 476 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, Washington/Dulle, VA at 12:00Z on 2010-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -47 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
476 J/kg
Mixed-layer CIN
-115 J/kg
Mixed-layer LCL
1158 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
-47 m²/s²
0-3 km storm-relative helicity
48 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.4

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 Jun 4, 2:19 PM EDT, 58 minutes earlier.

Area forecast discussion, Jun 4, 2:19 PM EDT, 58 minutes before
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Hazardous weather outlook, Jun 4, 2:43 PM EDT, 34 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
243 PM EDT FRI JUN 4 2010

PAZ004>006-010>012-037-041-042-045-046-051-053-051845-
WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-TIOGA-
NORTHERN LYCOMING-SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-
MONTOUR-COLUMBIA-
243 PM EDT FRI JUN 4 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE OVER THE REGION THIS
AFTERNOON AND TONIGHT. SOME HAIL IS POSSIBLE...BUT DAMAGING WIND
GUSTS ARE THE MOST LIKELY THREAT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

SEVERE THUNDERSTORMS ARE POSSIBLE AGAIN ON SATURDAY AFTERNOON AND
NIGHT.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

PAZ017>019-024>028-033>036-049-050-052-056>059-063>066-051845-
CLEARFIELD-NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-
MIFFLIN-JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN-UNION-SNYDER-
NORTHUMBERLAND-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-ADAMS-
YORK-LANCASTER-
243 PM EDT FRI JUN 4 2010

...SEVERE THUNDERSTORM WATCH 255 IN EFFECT UNTIL 10 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...SATURDAY THROUGH THURSDAY.

SEVERE THUNDERSTORMS ARE POSSIBLE AGAIN ON SATURDAY AFTERNOON AND
NIGHT.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

DANGELO

In the hours before

Special weather statement, Jun 4, 1:36 PM EDT, 1 hour 41 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
136 PM EDT FRI JUN 4 2010

PAZ035-036-041815-
FRANKLIN PA-FULTON PA-
136 PM EDT FRI JUN 4 2010

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN FRANKLIN AND SOUTHERN
FULTON COUNTIES...

AT 125 PM EDT...A STRONG THUNDERSTORM WAS 13 MILES SOUTHEAST OF
BREEZEWOOD...MOVING EAST AT 20 MPH.

WIND GUSTS TO 40 MPH AND PENNY SIZE HAIL 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 MERCERSBURG AROUND 150 PM AND GREENCASTLE AROUND 220 PM.

THIS WILL IMPACT I-81 BETWEEN MILE MARKERS 1 AND 15.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11...ROUTE
30...ROUTE 522.

LAT...LON 3975 7815 3993 7813 3992 7759 3972 7761
      3972 7788

FORECASTER: RHG
Special weather statement, Jun 4, 2:23 PM EDT, 54 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
223 PM EDT FRI JUN 4 2010

PAZ036-041900-
FRANKLIN PA-
223 PM EDT FRI JUN 4 2010

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN FRANKLIN COUNTY...

AT 222 PM EDT...A STRONG THUNDERSTORM WAS NEAR GREENCASTLE...MOVING
EAST AT 25 MPH.

WIND GUSTS TO 50 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THIS
STORM. THIS STORM WILL BE NEAR GREENCASTLE AROUND 240 PM...MARION
AROUND 250 PM AND WAYNESBORO AROUND 300 PM.

THIS WILL IMPACT I-81 BETWEEN MILE MARKERS 1 AND 10.

THIS WILL ALSO IMPACT ROUTE 11.

LAT...LON 3974 7802 3991 7796 3984 7747 3972 7751
      3972 7792

FORECASTER: RHG
Special weather statement, Jun 4, 2:28 PM EDT, 49 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
228 PM EDT FRI JUN 4 2010

PAZ026-028-036-056-063-041900-
CUMBERLAND PA-FRANKLIN PA-HUNTINGDON PA-JUNIATA PA-PERRY PA-
228 PM EDT FRI JUN 4 2010

...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL HUNTINGDON...NORTH
CENTRAL FRANKLIN...NORTHWESTERN CUMBERLAND...SOUTHWESTERN JUNIATA AND
SOUTHWESTERN PERRY COUNTIES...

AT 226 PM EDT...A STRONG THUNDERSTORM WAS 16 MILES SOUTHEAST OF
HUNTINGDON...MOVING EAST AT 30 MPH.

WIND GUSTS TO 40 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL BE NEAR DOYLESBURG AROUND 240 PM...BIG SPRING STATE
PARK AROUND 250 PM AND COLONEL DENNING STATE PARK AROUND 300 PM.

THIS WILL IMPACT THE PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 204
AND 213.

THIS WILL ALSO IMPACT ROUTE 522.

LAT...LON 4022 7798 4040 7795 4039 7786 4038 7786
      4037 7784 4037 7776 4039 7775 4037 7737
      4015 7741

FORECASTER: RHG
Special weather statement, Jun 4, 2:50 PM EDT, 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
250 PM EDT FRI JUN 4 2010

PAZ065-066-041915-
LANCASTER PA-YORK PA-
250 PM EDT FRI JUN 4 2010

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL LANCASTER AND
SOUTHEASTERN YORK COUNTIES...

AT 245 PM EDT...A STRONG THUNDERSTORM WAS 13 MILES SOUTHEAST OF RED
LION...MOVING EAST AT 30 MPH.

WIND GUSTS TO 50 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THIS
STORM. THIS STORM WILL BE NEAR WAKEFIELD AROUND 310 PM.

THIS WILL IMPACT ROUTE 222.

LAT...LON 3974 7649 3992 7643 3985 7603 3984 7602
      3978 7606 3973 7610 3972 7615 3971 7638

FORECASTER: RHG

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 3, 8:18 PM EDTSpecial Weather StatementCTPLancaster57 min
Jun 3, 8:32 PM EDTSevere Thunderstorm WarningCTPLancaster58 min
Jun 3, 8:44 PM EDTSpecial Weather StatementCTPElk31 min
Jun 3, 9:17 PM EDTSpecial Weather StatementCTPElk58 min
Jun 3, 10:13 PM EDTSpecial Weather StatementCTPClearfield62 min
Jun 4, 1:36 PM EDTSpecial Weather StatementCTPFulton39 min
Jun 4, 2:23 PM EDTSpecial Weather StatementCTPFranklin37 min
Jun 4, 2:28 PM EDTSpecial Weather StatementCTPHuntingdon32 min
Jun 4, 2:50 PM EDTSpecial Weather StatementCTPLancaster25 min
Jun 4, 3:31 PM EDTSpecial Weather StatementCTPCumberland14 min
Jun 4, 3:41 PM EDTSpecial Weather StatementCTPCumberland49 min
Jun 4, 4:06 PM EDTSpecial Weather StatementCTPDauphin24 min
Jun 4, 4:13 PM EDTSpecial Weather StatementCTPAdams47 min
Jun 4, 4:47 PM EDTSpecial Weather StatementCTPLebanon58 min
Jun 4, 4:53 PM EDTSpecial Weather StatementCTPClearfield22 min
Jun 4, 5:35 PM EDTSpecial Weather StatementCTPLancaster25 min
Jun 4, 5:38 PM EDTSpecial Weather StatementCTPFranklin37 min
Jun 4, 5:42 PM EDTSevere Thunderstorm WarningCTPAdams, Cumberland, Franklin, Fulton, Huntingdon63 min
Jun 4, 6:02 PM EDTSpecial Weather StatementCTPLancaster13 min
Jun 4, 6:13 PM EDTSpecial Weather StatementCTPLancaster62 min
Jun 4, 6:28 PM EDTSpecial Weather StatementCTPWarren62 min
Jun 4, 6:38 PM EDTSpecial Weather StatementCTPAdams37 min
Jun 4, 7:12 PM EDTSpecial Weather StatementCTPAdams33 min
Jun 4, 7:21 PM EDTSevere Thunderstorm WarningCTPAdams, York39 min
Jun 4, 7:52 PM EDTSpecial Weather StatementCTPElk53 min
Jun 4, 7:58 PM EDTSevere Thunderstorm WarningCTPYork32 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.