Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Pittsburgh, PA

March 23, 20114 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Mar 23, 2011, 5:14 PM EDT for 4 counties in Pennsylvania. It was in force for 47 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 23, 2011, 5:14 PM EDT (21:14 UTC)
Expired: Mar 23, 2011, 6:01 PM EDT
In force: 47 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Allegheny County, PA, Fayette County, PA, Washington County, PA, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 33 km from the middle of the area, began a volume at 21:16 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.

What was reported inside it

Time	Report	Where	Remark
Mar 23, 5:20 PM EDT	HAIL 1	Lincoln Place, PA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 23, 1:13 PM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 9.2 hours before the alert went out and 16 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 742 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 546 m²/s²
0-3 km storm-relative helicity: 612 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

879 
WUUS51 KPBZ 232114
SVRPBZ
PAC003-051-125-129-232215-
/O.NEW.KPBZ.SV.W.0021.110323T2114Z-110323T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
514 PM EDT WED MAR 23 2011

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHWESTERN FAYETTE COUNTY IN SOUTHWEST PENNSYLVANIA...
  CENTRAL WASHINGTON COUNTY IN SOUTHWEST PENNSYLVANIA...
  SOUTHERN ALLEGHENY COUNTY IN SOUTHWEST PENNSYLVANIA...
  EXTREME SOUTHWESTERN WESTMORELAND COUNTY IN SOUTHWEST
  PENNSYLVANIA...

* UNTIL 615 PM EDT

* AT 511 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  CANONSBURG...MOVING EAST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO  
  WASHINGTON...         CANONSBURG...         BRIDGEVILLE...
  MCMURRAY...           UPPER SAINT CLAIR...  MOUNT LEBANON...
  BETHEL PARK...        BENTLEYVILLE...       BALDWIN...
  JEFFERSON BORO...     MONONGAHELA...        CHARLEROI...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT WEDNESDAY EVENING
FOR WESTERN MARYLAND AND EAST CENTRAL OHIO AND SOUTHWESTERN
PENNSYLVANIA AND NORTHERN WEST VIRGINIA.

&&

LAT...LON 4039 7978 4010 7990 4013 8037 4035 8037
TIME...MOT...LOC 2114Z 268DEG 42KT 4030 8024

$$

2 follow-up statements

201 
WWUS51 KPBZ 232148
SVSPBZ

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
548 PM EDT WED MAR 23 2011

PAC003-125-232158-
/O.CAN.KPBZ.SV.W.0021.000000T0000Z-110323T2215Z/
WASHINGTON PA-ALLEGHENY PA-
548 PM EDT WED MAR 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR ALLEGHENY AND WASHINGTON
COUNTIES IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT WEDNESDAY EVENING
FOR WESTERN MARYLAND AND EAST CENTRAL OHIO AND SOUTHWESTERN
PENNSYLVANIA AND NORTHERN WEST VIRGINIA.

LAT...LON 4019 7986 4016 7989 4015 7987 4013 7988
      4013 7989 4016 7990 4016 7989 4020 7986
      4020 7985
TIME...MOT...LOC 2148Z 268DEG 42KT 4029 7972

$$

PAC051-129-232215-
/O.CON.KPBZ.SV.W.0021.000000T0000Z-110323T2215Z/
FAYETTE PA-WESTMORELAND PA-
548 PM EDT WED MAR 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR WESTMORELAND AND FAYETTE COUNTIES...

AT 541 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 10 MILES NORTH OF MONESSEN...MOVING EAST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO  
  MONESSEN...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT WEDNESDAY EVENING
FOR WESTERN MARYLAND AND EAST CENTRAL OHIO AND SOUTHWESTERN
PENNSYLVANIA AND NORTHERN WEST VIRGINIA.

LAT...LON 4019 7986 4016 7989 4015 7987 4013 7988
      4013 7989 4016 7990 4016 7989 4020 7986
      4020 7985
TIME...MOT...LOC 2148Z 268DEG 42KT 4029 7972

$$

064 
WWUS51 KPBZ 232201
SVSPBZ

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
601 PM EDT WED MAR 23 2011

PAC051-129-232211-
/O.CAN.KPBZ.SV.W.0021.000000T0000Z-110323T2215Z/
FAYETTE PA-WESTMORELAND PA-
601 PM EDT WED MAR 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR WESTMORELAND AND FAYETTE
COUNTIES IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT WEDNESDAY EVENING
FOR WESTERN MARYLAND AND EAST CENTRAL OHIO AND SOUTHWESTERN
PENNSYLVANIA AND NORTHERN WEST VIRGINIA.

LAT...LON 4019 7986 4016 7989 4015 7987 4013 7988
      4013 7989 4016 7990 4016 7989 4020 7986
      4020 7985
TIME...MOT...LOC 2201Z 268DEG 42KT 4026 7952

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 23, 3:16 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	59 min
Mar 23, 3:36 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	54 min
Mar 23, 3:45 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Indiana, Westmoreland	60 min
Mar 23, 3:47 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	58 min
Mar 23, 4:09 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	66 min
Mar 23, 4:18 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler	27 min
Mar 23, 4:20 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	40 min
Mar 23, 4:25 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	65 min
Mar 23, 4:34 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Indiana, Westmoreland	56 min
Mar 23, 4:37 PM EDT	Tornado Warning	PBZ	Westmoreland	23 min
Mar 23, 4:42 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	63 min
Mar 23, 4:54 PM EDT	Tornado Warning	PBZ	Indiana, Westmoreland	36 min
Mar 23, 4:55 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Beaver, Butler, Washington, Westmoreland	65 min
Mar 23, 5:22 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	42 min
Mar 23, 5:26 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	39 min
Mar 23, 5:38 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington	22 min
Mar 23, 5:46 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	59 min
Mar 23, 6:02 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	45 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.