Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 141, NWS Pittsburgh, PA

September 17, 20164 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Sep 17, 2016, 5:49 PM EDT for 4 counties in Pennsylvania. It was in force for 26 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: Sep 17, 2016, 5:49 PM EDT (21:49 UTC)
Expired: Sep 17, 2016, 6:15 PM EDT
In force: 26 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Butler County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 70 km from the middle of the area, began a volume at 21:52 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, 9.8 hours before the alert went out and 83 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: 76 J/kg
Mixed-layer CIN: -151 J/kg
Mixed-layer LCL: 974 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 77 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 Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 17, 2:37 PM EDT, 3 hours 12 minutes earlier.

Area forecast discussion, Sep 17, 2:37 PM EDT, 3 hours 12 minutes before

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Hazardous weather outlook, Sep 17, 4:12 AM EDT, 13 hours 37 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
412 AM EDT SAT SEP 17 2016

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021-509>514-180815-
GARRETT-TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON-JEFFERSON-
MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-MERCER-VENANGO-FOREST-
LAWRENCE-BUTLER-CLARION-BEAVER-ALLEGHENY-ARMSTRONG-INDIANA-
WASHINGTON-GREENE-WESTMORELAND-WESTMORELAND RIDGES-FAYETTE-
FAYETTE RIDGES-HANCOCK-BROOKE-OHIO-MARSHALL-WETZEL-MARION-MONONGALIA-
RIDGES OF EASTERN MONONGALIA AND NORTHWESTERN PRESTON-PRESTON-
EASTERN PRESTON-WESTERN TUCKER-EASTERN TUCKER-
412 AM EDT SAT SEP 17 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...EAST
CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST
PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA...WESTERN
PENNSYLVANIA...NORTHERN WEST VIRGINIA AND NORTHERN PANHANDLE OF
WEST VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Sep 17, 4:08 PM EDT, 1 hour 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
408 PM EDT SAT SEP 17 2016

PAZ007-172045-
MERCER-
408 PM EDT SAT SEP 17 2016

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN MERCER COUNTY...

AT 408 PM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR GREENVILLE...
OR 14 MILES NORTH OF SHARPSVILLE...MOVING NORTHEAST AT 40 MPH.

WINDS IN EXCESS OF 40 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
JAMESTOWN.

LAT...LON 4149 8034 4148 8026 4141 8052 4149 8052
TIME...MOT...LOC 2008Z 242DEG 35KT 4147 8048

24

Special weather statement, Sep 17, 5:46 PM EDT, 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
546 PM EDT SAT SEP 17 2016

PAZ007-008-013-014-172215-
LAWRENCE-BUTLER-MERCER-VENANGO-
546 PM EDT SAT SEP 17 2016

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN MERCER...
SOUTHWESTERN VENANGO...NORTHWESTERN BUTLER AND NORTHEASTERN LAWRENCE
COUNTIES...

AT 546 PM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR NEW CASTLE
NORTHWEST...OR NEAR NEW CASTLE...MOVING NORTHEAST AT 35 MPH.

WIND GUSTS UP TO 50 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
NEW CASTLE...GROVE CITY...SLIPPERY ROCK...HARRISVILLE...PLAIN GROVE
TOWNSHIP...CLINTONVILLE...EAU CLAIRE...HARLANSBURG...BARKEYVILLE...
VOLANT...CHERRY VALLEY AND BOYERS.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
  INTERSTATE 79 IN PENNSYLVANIA BETWEEN MILE MARKERS 106 AND 114.

  INTERSTATE 80 IN PENNSYLVANIA BETWEEN MILE MARKERS 21 AND 35.

LAT...LON 4099 8030 4105 8035 4132 7996 4114 7980
TIME...MOT...LOC 2146Z 237DEG 30KT 4104 8027

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 4:08 PM EDT	Special Weather Statement	PBZ	Mercer	37 min
Sep 17, 5:46 PM EDT	Special Weather Statement	PBZ	Mercer	29 min
Sep 17, 6:01 PM EDT	Tornado Warning	PBZ	Butler, Lawrence, Mercer, Venango	29 min
Sep 17, 6:25 PM EDT	Tornado Warning	PBZ	Armstrong, Butler, Clarion, Venango	35 min
Sep 17, 7:17 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer, Venango	28 min
Sep 17, 7:33 PM EDT	Special Weather Statement	PBZ	Venango	27 min
Sep 17, 7:38 PM EDT	Tornado Warning Tornado observed	PBZ	Armstrong, Butler, Clarion, Venango	37 min
Sep 17, 7:40 PM EDT	Tornado Warning	PBZ	Forest, Venango	35 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2016 Every severe thunderstorm warning in 2016

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.