Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 35, NWS Pittsburgh, PA

May 27, 2014Allegheny County, Beaver County, Washington County, Pennsylvania; Columbiana County, Ohio; Hancock County, West Virginia

NWS Pittsburgh, PA issued this severe thunderstorm warning at May 27, 2014, 9:49 PM EDT for Allegheny County, Beaver County, Washington County, Pennsylvania; Columbiana County, Ohio; Hancock County, West Virginia. 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: May 27, 2014, 9:49 PM EDT (01:49 UTC)
Expired: May 27, 2014, 10:15 PM EDT
In force: 26 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Columbiana County, OH, Allegheny County, PA, Beaver County, PA, Washington County, PA, Hancock County, WV

The radar

The Pittsburgh radar (KPBZ), 14 km from the middle of the area, began a volume at 01:51 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 00:00Z, 1.8 hours before the alert went out and 27 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: 874 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 984 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 189 m²/s²
0-3 km storm-relative helicity: 209 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.3

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 Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 27, 8:58 PM EDT, 51 minutes earlier.

Area forecast discussion, May 27, 8:58 PM EDT, 51 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
858 PM EDT TUE MAY 27 2014

.SYNOPSIS...
A SLOW MOVING COLD FRONT WILL BRING SHOWERS AND THUNDERSTORMS
INTO MIDWEEK.

&&

.NEAR TERM /THROUGH WEDNESDAY/...
CROSSING SHRTWVS AND OUTFLOW BOUNDARIES CONT TO BRING SCT-NMRS
SHWRS AND TSTMS TO THE AREA. LACK OF SHEAR AND DCRG INSTBY THIS
EVE SHOULD ALLOW FOR A GRDL DCRS IN COVG/INTENSITY OF THE CNVCTN.
RECENT RADAR VIL LOOPS HAVE BEGUN TO SHOW A SLOW OVERALL DCRG
TREND.

A SFC BNDRY WL DROP SLOWLY S ACRS THE AREA LTR TNGT INTO WED. SCT
SHWRS WL RMN ACRS THE AREA OVRNGT INTO WED MRNG BEFORE SOME
DESTABILZATION BRINGS MORE CNVCTN WED AFTN. AGAIN WITH LACK OF
SHEAR AND LOW LVLS OF INSTBY LCLY HVY RAIN WL BE THE MAIN CONCERN.
TEMPS WL RMN ABV AVG THRU THE PD.

&&

.SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY/...
THE FRONT SAGS SOUTH WEDNESDAY NIGHT AND THURSDAY WITH HIGHEST
POPS ACROSS THE SOUTHERN RIDGES AND ENDING BY LATE DAY THURSDAY.
TEMPERATURES WILL COOL BACK TOWARD SEASONAL AVERAGES.

&&

.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
A RIDGE OF HIGH PRESSURE WILL DOMINATE THE WEEKEND WITH SEASONAL
TEMPERATURES. THE NEXT SYSTEM APPROACHES AND INCREASES THE CHANCE
OF RAIN EARLY NEXT WEEK. LITTLE DIFFERENCES BETWEEN THE ECMWF AND
GFS HAVE LED TO NO HIGHER THAN CHANCE POPS IN THE FORECAST FOR
MON/TUE.

&&

.AVIATION /01Z WEDNESDAY THROUGH SUNDAY/...
CROSSING DISTURBANCES WL CONT TO BRING SCT SHWRS AND TSTMS THIS
EVE...WITH CNVCTN GRDLY DMNSHG AS INSTBY DCRS. A SFC BNDRY WL
APCH THE RGN TNGT WITH A FEW SHWRS PSBL MAINLY N OF PIT. MVFR
CONDS IN FOG ARE EXPD TO DVLP OVRNGT INTO ERLY WED MRNG WITH LLVL
MOISTURE IN PLACE. THIS MOISTURE IS EXPD TO LEAD TO MVFR CU
DVLPMNT WED MRNG AS WELL. DESTABILIZATION BY WED AFTN WL BRING
MORE NMRS SHWRS/TSTMS AND WL INCLUDE A VCTS MENTION IN THE TAFS
ESP S OF I 80.

.OUTLOOK.../WEDNESDAY NIGHT THROUGH SUNDAY/...
A SLOW MOVG SFC BNDRY WL BRING PSBL RSTRNS IN SHWRS/TSTMS S OF I
80 WED EVE...AND S OF I 70 THU.

&&

.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...NONE.
OH...NONE.
PA...NONE.
WV...NONE.

&&

07

Hazardous weather outlook, May 27, 9:21 PM EDT, 28 minutes before

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In the hours before

Special weather statement, May 27, 8:52 PM EDT, 57 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
852 PM EDT TUE MAY 27 2014

PAZ021-029-073>076-280130-
ALLEGHENY PA-FAYETTE PA-FAYETTE RIDGES PA-WASHINGTON PA-
WESTMORELAND PA-WESTMORELAND RIDGES PA-
852 PM EDT TUE MAY 27 2014

...STRONG THUNDERSTORMS WILL AFFECT EXTREME EAST CENTRAL
WASHINGTON...EXTREME SOUTHEASTERN ALLEGHENY...NORTHEASTERN FAYETTE
AND SOUTHERN WESTMORELAND COUNTIES...

AT 847 PM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 3 MILES
EAST OF JEANNETTE TO MONONGAHELA...MOVING SOUTHEAST AT 40 MPH.

WIND GUSTS OF 40 TO 50 MPH ARE POSSIBLE WITH THESE STORMS.

  LOCATIONS IMPACTED INCLUDE...
  WEST NEWTON...        MONESSEN...           JEANNETTE...
  DONORA...             CHARLEROI...          GREENSBURG...
  BELLE VERNON...       NEW STANTON...        PERRYOPOLIS...
  MOUNT PLEASANT...     DONEGAL...            CONNELLSVILLE...

PLEASE REPORT SIGNIFICANT WEATHER BY POSTING TO THE NWS PITTSBURGH
FACEBOOK PAGE OR BY USING TWITTER @NWSPITTSBURGH.

LAT...LON 4011 7918 4011 7920 4007 7926 3990 7940
      3986 7941 3982 7936 3979 7936 3978 7936
      3978 7938 3977 7937 3974 7940 4018 7998
      4037 7953 4016 7914

15

Local storm report, May 27, 8:57 PM EDT, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
857 PM EDT TUE MAY 27 2014

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

0830 PM     TSTM WND DMG     PITTSBURGH              40.44N  79.98W
05/27/2014                   ALLEGHENY          PA   PUBLIC

            TREES DOWN BEDFORD AVE IN HILL DISTRICT.

&&

EVENT NUMBER PBZ1401418

XX

Local storm report, May 27, 8:58 PM EDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
858 PM EDT TUE MAY 27 2014

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

0830 PM     TSTM WND DMG     PITTSBURGH              40.44N  79.98W
05/27/2014                   ALLEGHENY          PA   911 CALL CENTER

            TREES DOWN ONTO WIRES IN SPRING GARDEN./RAMAGE ROAD

&&

EVENT NUMBER PBZ1401419

XX

Local storm report, May 27, 9:40 PM EDT, 9 minutes before

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Local storm report, May 27, 9:42 PM EDT, 7 minutes before

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Special weather statement, May 27, 9:42 PM EDT, 7 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 8:09 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	51 min
May 27, 8:19 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Westmoreland	41 min
May 27, 8:52 PM EDT	Special Weather Statement	PBZ	Westmoreland	38 min
May 27, 9:07 PM EDT	Areal Flood Warning	PBZ	Allegheny, Beaver	6 hr
May 27, 9:42 PM EDT	Special Weather Statement	PBZ	Beaver	48 min
May 27, 10:19 PM EDT	Special Weather Statement	PBZ	Allegheny	41 min
May 27, 11:27 PM EDT	Areal Flood Warning	PBZ	Fayette, Washington, Westmoreland	3 hr
May 27, 11:32 PM EDT	Special Weather Statement	PBZ	Fayette	58 min
May 27, 11:37 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	38 min
May 28, 12:38 AM EDT	Areal Flood Warning	PBZ	Washington	4 hr
May 28, 4:19 AM EDT	Flash Flood Watch	PBZ	Allegheny, Beaver, Fayette, Greene, Washington, Westmoreland	17 hr
May 28, 5:02 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	28 min
May 28, 5:22 PM EDT	Areal Flood Warning	PBZ	Washington	3 hr
May 28, 5:53 PM EDT	Special Weather Statement	PBZ	Fayette	52 min
May 28, 6:57 PM EDT	Areal Flood Advisory	PBZ	Westmoreland	3 hr
May 28, 7:38 PM EDT	Areal Flood Warning	PBZ	Westmoreland	3 hr
May 28, 2:38 PM EDT	Flash Flood Warning	PBZ	Coshocton, Muskingum	3 hr
May 28, 3:17 PM EDT	Special Weather Statement	PBZ	Monroe	58 min
May 28, 3:24 PM EDT	Severe Thunderstorm Warning	PBZ	Monroe	51 min
May 28, 3:45 PM EDT	Special Weather Statement	PBZ	Carroll, Tuscarawas	45 min
May 28, 4:25 PM EDT	Areal Flood Warning	PBZ	Coshocton, Tuscarawas	3 hr
May 28, 2:40 PM EDT	Special Weather Statement	PBZ	Marshall	50 min
May 28, 2:49 PM EDT	Special Weather Statement	PBZ	Marshall	26 min
May 28, 4:13 PM EDT	Special Weather Statement	PBZ	Marion	32 min
May 28, 4:49 PM EDT	Areal Flood Advisory	PBZ	Marion	3 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014 Severe Thunderstorm Warnings in Ohio, 2014 Severe Thunderstorm Warnings in West Virginia, 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.