Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 130, NWS State College, PA

July 18, 20134 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 18, 2013, 5:11 PM EDT for 4 counties in Pennsylvania. It was in force for 64 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 18, 2013, 5:11 PM EDT (21:11 UTC)
Expired
Jul 18, 2013, 6:15 PM EDT
In force
64 min
Issued by
NWS State College, PA
Area
Storm-based polygon

Counties Cameron County, PA, Centre County, PA, Clinton County, PA, Lycoming County, PA

The radar

The State College radar (KCCX), 44 km from the middle of the area, began a volume at 21:13 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 nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.2 hours before the alert went out and 207 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, Buffalo Intl Airport, NY at 12:00Z on 2013-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3057 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, Buffalo Intl Airport, NY at 12:00Z on 2013-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939Sfc1 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
3057 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
718 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.3

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 18, 3:10 PM EDT, 2 hours 1 minute earlier.

Area forecast discussion, Jul 18, 3:10 PM EDT, 2 hours 1 minute before
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Hazardous weather outlook, Jul 18, 12:53 PM EDT, 4 hours 18 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1253 PM EDT THU JUL 18 2013

PAZ004>006-010>012-017-018-024-025-033-034-191700-
WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD-
NORTHERN CENTRE-CAMBRIA-BLAIR-SOMERSET-BEDFORD-
1253 PM EDT THU JUL 18 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

ISOLATED THUNDERSTORMS MAY CAUSE BRIEF DOWNPOURS AND GUSTY WINDS
THIS AFTERNOON AND THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

A STRONG COLD FRONT WILL MOVE ACROSS THE AREA SATURDAY. STRONG TO
POTENTIALLY SEVERE THUNDERSTORMS WILL PRECEDE AND ACCOMPANY THIS
FRONTAL PASSAGE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ019-037-041-042-058-191700-
SOUTHERN CENTRE-TIOGA-NORTHERN LYCOMING-SULLIVAN-SCHUYLKILL-
1253 PM EDT THU JUL 18 2013

...HEAT ADVISORY IN EFFECT FROM 2 PM TO 8 PM EDT FRIDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

ISOLATED THUNDERSTORMS MAY CAUSE BRIEF DOWNPOURS AND GUSTY WINDS
THIS AFTERNOON AND THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

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

   HEAT ADVISORY.

A STRONG COLD FRONT WILL MOVE ACROSS THE AREA SATURDAY. STRONG TO
POTENTIALLY SEVERE THUNDERSTORMS WILL PRECEDE AND ACCOMPANY THIS
FRONTAL PASSAGE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ026>028-035-036-045-046-049>053-056-057-059-063>066-191700-
HUNTINGDON-MIFFLIN-JUNIATA-FULTON-FRANKLIN-SOUTHERN CLINTON-
SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-NORTHUMBERLAND-COLUMBIA-PERRY-
DAUPHIN-LEBANON-CUMBERLAND-ADAMS-YORK-LANCASTER-
1253 PM EDT THU JUL 18 2013

...HEAT ADVISORY IN EFFECT UNTIL 10 PM EDT THIS EVENING...
...HEAT ADVISORY IN EFFECT FROM 2 PM TO 8 PM EDT FRIDAY...

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.

   HEAT ADVISORY.

IN ADDITION...ISOLATED THUNDERSTORMS MAY CAUSE BRIEF DOWNPOURS AND
GUSTY WINDS THIS AFTERNOON AND THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

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

   HEAT ADVISORY.

A STRONG COLD FRONT WILL MOVE ACROSS THE AREA SATURDAY. STRONG TO
POTENTIALLY SEVERE THUNDERSTORMS WILL PRECEDE AND ACCOMPANY THIS
FRONTAL PASSAGE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jul 18, 2:48 PM EDT, 2 hours 23 minutes before
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Special weather statement, Jul 18, 3:03 PM EDT, 2 hours 8 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
303 PM EDT THU JUL 18 2013

PAZ006-037-182000-
POTTER PA-TIOGA PA-
303 PM EDT THU JUL 18 2013

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN POTTER AND NORTHWESTERN
TIOGA COUNTIES...

AT 301 PM EDT...A STRONG THUNDERSTORM WAS 6 MILES SOUTHEAST OF
OSWAYO...MOVING EAST AT 15 MPH.

WIND GUSTS TO 50 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THIS
STORM. THIS STORM WILL AFFECT ULYSSES...HARRISON VALLEY AND GAINES.

OTHER NOTABLE LOCATIONS IMPACTED WILL BE... SKI DENTON SKI AREA.

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

LAT...LON 4165 7747 4181 7807 4201 7803 4201 7736

FORECASTER: MARTIN
Special weather statement, Jul 18, 3:28 PM EDT, 1 hour 43 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
328 PM EDT THU JUL 18 2013

PAZ005-006-010-011-182000-
CAMERON PA-ELK PA-MCKEAN PA-POTTER PA-
328 PM EDT THU JUL 18 2013

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN CAMERON...
NORTHERN ELK...SOUTHEASTERN MCKEAN AND SOUTHERN POTTER COUNTIES...

AT 323 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 6
MILES NORTHEAST OF ROULETTE TO EAST BRANCH DAM TO TIONESTA...MOVING
EAST AT 25 MPH.

WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS.
THESE STORMS WILL AFFECT KEATING SUMMIT...JOHNSONBURG AND TRUMAN.

LAT...LON 4169 7761 4147 7794 4148 7799 4145 7799
      4140 7806 4142 7910 4143 7907 4146 7906
      4145 7897 4160 7896 4159 7867 4183 7813

FORECASTER: KF
Special weather statement, Jul 18, 3:56 PM EDT, 1 hour 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
356 PM EDT THU JUL 18 2013

PAZ006-037-041-182030-
NORTHERN LYCOMING PA-POTTER PA-TIOGA PA-
356 PM EDT THU JUL 18 2013

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT EAST CENTRAL POTTER...
NORTH CENTRAL LYCOMING AND TIOGA COUNTIES...

AT 348 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
WOODHULL TO LEETONIA...MOVING EAST AT 20 MPH.

WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS.
THESE STORMS WILL AFFECT LEONARD HARRISON STATE PARK...WELLSBORO AND
TIOGA.

OTHER NOTABLE LOCATIONS IMPACTED WILL BE... MANSFIELD UNIVERSITY.

LAT...LON 4199 7692 4192 7691 4151 7711 4157 7770
      4201 7747 4200 7693

FORECASTER: KF
Special weather statement, Jul 18, 3:58 PM EDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
358 PM EDT THU JUL 18 2013

PAZ006-010>012-182045-
CAMERON PA-ELK PA-NORTHERN CLINTON PA-POTTER PA-
358 PM EDT THU JUL 18 2013

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT ELK...NORTHERN
CAMERON...NORTHWESTERN CLINTON AND SOUTHERN POTTER COUNTIES...

AT 352 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 6
MILES SOUTHEAST OF COUDERSPORT TO ELK RIVER TO MARIENVILLE...MOVING
EAST AT 20 MPH.

WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS.
THESE STORMS WILL AFFECT LYMAN RUN STATE PARK...ST. MARYS...PORTLAND
MILLS...CAMERON AND BRANDY CAMP.

LAT...LON 4170 7765 4157 7769 4156 7760 4151 7760
      4141 7800 4131 7877 4142 7910 4146 7906
      4145 7897 4156 7896 4163 7848 4160 7848
      4162 7821 4169 7821 4175 7794

FORECASTER: KF
Special weather statement, Jul 18, 4:45 PM EDT, 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
445 PM EDT THU JUL 18 2013

PAZ006-010>012-017-037-041-182115-
CAMERON PA-CLEARFIELD PA-ELK PA-NORTHERN CLINTON PA-
NORTHERN LYCOMING PA-POTTER PA-TIOGA PA-
445 PM EDT THU JUL 18 2013

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CAMERON...ELK...
NORTHERN CLEARFIELD...NORTHWESTERN CLINTON...NORTHWESTERN LYCOMING...
SOUTHERN POTTER AND SOUTHWESTERN TIOGA COUNTIES...

AT 439 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 6
MILES SOUTH OF LEONARD HARRISON STATE PARK TO STEVENSON DAM TO
SIGEL...MOVING SOUTH AT 15 MPH.

WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS.
THESE STORMS WILL AFFECT CEDAR RUN...SLATE RUN AND BROCKPORT.

OTHER NOTABLE LOCATIONS IMPACTED WILL BE... SKI SAWMILL SKI AREA.

LAT...LON 4143 7708 4120 7789 4125 7790 4119 7797
      4115 7880 4121 7876 4121 7872 4127 7876
      4137 7897 4135 7910 4142 7910 4146 7906
      4145 7897 4150 7896 4158 7815 4170 7733

FORECASTER: KF

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 8:55 PM EDTSpecial Weather StatementCTPSullivan35 min
Jul 18, 12:48 PM EDTHeat AdvisoryCTPAdams, Centre, Clinton, Columbia, Cumberland, Dauphin and 17 more31 hr
Jul 18, 2:48 PM EDTSpecial Weather StatementCTPMcKean42 min
Jul 18, 3:03 PM EDTSpecial Weather StatementCTPPotter57 min
Jul 18, 3:28 PM EDTSpecial Weather StatementCTPCameron, Elk, Potter32 min
Jul 18, 3:52 PM EDTAreal Flood AdvisoryCTPMcKean, Potter3 hr
Jul 18, 3:56 PM EDTSpecial Weather StatementCTPTioga34 min
Jul 18, 3:58 PM EDTSpecial Weather StatementCTPCameron, Elk47 min
Jul 18, 4:45 PM EDTSpecial Weather StatementCTPCameron, Elk30 min
Jul 18, 5:26 PM EDTSpecial Weather StatementCTPElk19 min
Jul 18, 6:12 PM EDTSpecial Weather StatementCTPLycoming33 min
Jul 18, 6:19 PM EDTSpecial Weather StatementCTPAdams, York26 min
Jul 18, 6:48 PM EDTSpecial Weather StatementCTPAdams27 min
Jul 18, 6:54 PM EDTSpecial Weather StatementCTPSnyder, Union36 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.