Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 137, NWS State College, PA

August 21, 20144 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 21, 2014, 5:17 PM EDT for 4 counties in Pennsylvania. It was in force for 58 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 21, 2014, 5:17 PM EDT (21:17 UTC)
Expired: Aug 21, 2014, 6:15 PM EDT
In force: 58 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Blair County, PA, Cambria County, PA, Centre County, PA, Clearfield County, PA

The radar

The State College radar (KCCX), 36 km from the middle of the area, began a volume at 21:21 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

Pittsburgh, PA (KAGC), launched 12:00Z, 9.3 hours before the alert went out and 153 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: 324 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1058 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 21, 4:21 PM EDT, 56 minutes earlier.

Area forecast discussion, Aug 21, 4:21 PM EDT, 56 minutes before

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Hazardous weather outlook, Aug 21, 5:27 AM EDT, 11 hours 50 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
527 AM EDT THU AUG 21 2014

PAZ004-005-010-011-017>019-024>028-033>036-056-063>065-220930-
WARREN-MCKEAN-ELK-CAMERON-CLEARFIELD-NORTHERN CENTRE-SOUTHERN CENTRE-
CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN-JUNIATA-SOMERSET-BEDFORD-FULTON-
FRANKLIN-PERRY-CUMBERLAND-ADAMS-YORK-
527 AM EDT THU AUG 21 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

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

SCATTERED THUNDERSTORMS WITH LOCALLY HEAVY RAIN ARE EXPECTED TO
DEVELOP ACROSS THE SOUTHWEST HALF OF PENNSYLVANIA FRIDAY AFTERNOON
IN THE VICINITY OF A STALLED FRONTAL BOUNDARY. THERE IS A SLIGHT
CHANCE THAT RAINFALL COULD BE HEAVY ENOUGH TO CAUSE FLOODING IN A
FEW SPOTS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ006-012-037-041-042-045-046-049>053-057>059-066-220930-
POTTER-NORTHERN CLINTON-TIOGA-NORTHERN LYCOMING-SULLIVAN-
SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-
NORTHUMBERLAND-COLUMBIA-DAUPHIN-SCHUYLKILL-LEBANON-LANCASTER-
527 AM EDT THU AUG 21 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

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

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 21, 3:55 PM EDT, 1 hour 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
355 PM EDT THU AUG 21 2014

PAZ017>019-212030-
NORTHERN CENTRE PA-SOUTHERN CENTRE PA-CLEARFIELD PA-
355 PM EDT THU AUG 21 2014

...A STRONG THUNDERSTORM IS AFFECTING THE AREA...

AT 353 PM EDT...DOPPLER RADAR INDICATED AN AREA OF THUNDERSTORMS
BETWEEN MAHAFFEY TO PORT MATILDA...MOVING EAST AT 25 MPH.

30 MPH WIND GUSTS WILL BE POSSIBLE WITH THIS STORM. VERY HEAVY RAIN
IS ALSO POSSIBLE.

THIS STRONG THUNDERSTORM WILL BE NEAR...
  HOUTZDALE AROUND 400 PM EDT.
  OSCEOLA MILLS AROUND 410 PM EDT.
  PHILIPSBURG...CHESTER HILL...NORTH PHILIPSBURG...SOUTH PHILIPSBURG
AND SANDY RIDGE AROUND 420 PM EDT.
  STORMSTOWN...PORT MATILDA AND BLACK MOSHANNON STATE PARK AROUND 430
PM EDT.

OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE RAMEY...LUMBER CITY...
BRISBIN...GLEN HOPE...MAHAFFEY AND GRAMPIAN.

THIS INCLUDES INTERSTATE 99 BETWEEN MILE MARKERS 56 AND 70.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4098 7877 4087 7787 4070 7798 4074 7813
      4074 7828 4088 7881 4089 7881
TIME...MOT...LOC 1953Z 278DEG 22KT 4086 7842

CR

Special weather statement, Aug 21, 4:25 PM EDT, 52 minutes before

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Local storm report, Aug 21, 4:30 PM EDT, 47 minutes before

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Special weather statement, Aug 21, 4:40 PM EDT, 37 minutes before

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Special weather statement, Aug 21, 4:43 PM EDT, 34 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
443 PM EDT THU AUG 21 2014

PAZ019-026-027-212115-
MIFFLIN PA-SOUTHERN CENTRE PA-HUNTINGDON PA-
443 PM EDT THU AUG 21 2014

...A STRONG THUNDERSTORM IS AFFECTING THE AREA...

AT 442 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
WHIPPLE DAM STATE PARK...MOVING SOUTHEAST AT 20 MPH.

30 MPH WIND GUSTS WILL BE POSSIBLE WITH THIS STORM.

THIS STRONG THUNDERSTORM WILL BE NEAR...
  LEWISTOWN...BURNHAM...BELLEVILLE...HIGHLAND PARK...YEAGERTOWN...
STRODES MILLS...REEDSVILLE...JUNIATA TERRACE AND SEVEN MOUNTAINS
AROUND 510 PM EDT.

OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE LONGFELLOW...TUSSEY
MOUNTAIN SKI AREA AND BARRVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

INTENSE RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4063 7798 4080 7790 4071 7748 4053 7758
      4051 7761 4049 7761 4047 7764
TIME...MOT...LOC 2042Z 293DEG 19KT 4069 7786

CR

Local storm report, Aug 21, 5:08 PM EDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
508 PM EDT THU AUG 21 2014

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

0328 PM     TSTM WND DMG     LANDISBURG              40.34N  77.31W
08/21/2014                   PERRY              PA   911 CALL CENTER

            TREES DOWN ON RURAL RUN ROAD

&&

EVENT NUMBER CTP1400301

LA CORTE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 8:28 PM EDT	Special Weather Statement	CTP	Elk	47 min
Aug 21, 1:34 PM EDT	Special Weather Statement	CTP	Montour	56 min
Aug 21, 1:44 PM EDT	Special Weather Statement	CTP	Union	31 min
Aug 21, 1:52 PM EDT	Severe Thunderstorm Warning	CTP	Northumberland, Snyder, Union	33 min
Aug 21, 1:55 PM EDT	Special Weather Statement	CTP	Centre	35 min
Aug 21, 2:00 PM EDT	Special Weather Statement	CTP	Juniata, Mifflin	60 min
Aug 21, 2:11 PM EDT	Special Weather Statement	CTP	Clearfield	34 min
Aug 21, 2:29 PM EDT	Special Weather Statement	CTP	Centre	31 min
Aug 21, 2:41 PM EDT	Severe Thunderstorm Warning	CTP	Montour, Northumberland, Union	22 min
Aug 21, 2:45 PM EDT	Special Weather Statement	CTP	Centre	30 min
Aug 21, 2:48 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Juniata, Mifflin, Perry	57 min
Aug 21, 3:02 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland, Schuylkill, Snyder, Union	58 min
Aug 21, 3:16 PM EDT	Tornado Warning	CTP	Cumberland, Perry	44 min
Aug 21, 3:19 PM EDT	Special Weather Statement	CTP	Clearfield	26 min
Aug 21, 3:47 PM EDT	Special Weather Statement	CTP	Mifflin	28 min
Aug 21, 3:55 PM EDT	Special Weather Statement	CTP	Clearfield	35 min
Aug 21, 3:55 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Perry, York	65 min
Aug 21, 4:14 PM EDT	Areal Flood Advisory	CTP	Cumberland, Perry	2 hr
Aug 21, 4:25 PM EDT	Special Weather Statement	CTP	Clearfield	35 min
Aug 21, 4:31 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Potter, Tioga	59 min
Aug 21, 4:36 PM EDT	Areal Flood Advisory	CTP	Clearfield	114 min
Aug 21, 4:38 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield	52 min
Aug 21, 4:40 PM EDT	Special Weather Statement	CTP	Cameron	35 min
Aug 21, 4:43 PM EDT	Special Weather Statement	CTP	Mifflin	32 min
Aug 21, 5:03 PM EDT	Areal Flood Advisory	CTP	Cumberland, Perry	117 min
Aug 21, 5:28 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Tioga	62 min
Aug 21, 5:30 PM EDT	Special Weather Statement	CTP	Cumberland	45 min
Aug 21, 5:34 PM EDT	Special Weather Statement	CTP	Tioga	41 min
Aug 21, 5:35 PM EDT	Areal Flood Warning	CTP	Potter, Tioga	3 hr
Aug 21, 5:54 PM EDT	Areal Flood Warning	CTP	Clearfield	3 hr
Aug 21, 6:03 PM EDT	Areal Flood Advisory	CTP	Lycoming	117 min
Aug 21, 6:05 PM EDT	Special Weather Statement	CTP	York	40 min
Aug 21, 6:15 PM EDT	Areal Flood Advisory	CTP	Adams, Cumberland, York	3 hr
Aug 21, 6:26 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Northumberland, Union	39 min
Aug 21, 6:46 PM EDT	Special Weather Statement	CTP	Potter	44 min
Aug 21, 7:19 PM EDT	Special Weather Statement	CTP	York	26 min
Aug 21, 7:34 PM EDT	Severe Thunderstorm Warning	CTP	York	26 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014 Every severe thunderstorm warning in 2014

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.