Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 109, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 18, 2017, 4:14 PM EDT for Allegheny County, Beaver County, Washington County, Pennsylvania; Jefferson County, Ohio; Brooke County, Hancock County, West Virginia. It was in force for 46 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
- Jun 18, 2017, 4:14 PM EDT (20:14 UTC)
- Expired
- Jun 18, 2017, 5:00 PM EDT
- In force
- 46 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Jefferson County, OH, Allegheny County, PA, Beaver County, PA, Washington County, PA, Brooke County, WV, Hancock County, WV
The radar
The Pittsburgh radar (KPBZ), 21 km from the middle of the area, began a volume at 20:13 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 18, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Pittsburgh, PA (KAGC), launched 12:00Z, 8.2 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.
- Mixed-layer CAPE
- 10 J/kg
- Mixed-layer CIN
- -104 J/kg
- Mixed-layer LCL
- 1243 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 91 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jun 18, 3:59 PM EDT, 15 minutes earlier.
Area forecast discussion, Jun 18, 3:59 PM EDT, 15 minutes before
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Hazardous Weather Outlook National Weather Service Pittsburgh PA 413 AM EDT Sun Jun 18 2017 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021-509>514-190815- 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- 413 AM EDT Sun Jun 18 2017 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. Slight risk for severe thunderstorms this afternoon and evening. The main severe threat is damaging winds and large hail. Thunderstorms will be capable of producing heavy rain, which could lead to flooding. This threat means there is a slight risk for excessive rainfall this afternoon and evening as well. .DAYS TWO THROUGH SEVEN...Monday through Saturday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures.
In the hours before
Special weather statement, Jun 18, 2:51 PM EDT, 1 hour 23 minutes before
Special Weather Statement National Weather Service Pittsburgh PA 251 PM EDT SUN JUN 18 2017 OHZ041-050-PAZ020-WVZ001-181915- Jefferson-Columbiana-Beaver-Hancock- 251 PM EDT SUN JUN 18 2017 ...A LINE OF THUNDERSTORMS CAPABLE OF PRODUCING GUSTY WIND WILL AFFECT NORTHEASTERN JEFFERSON...SOUTHEASTERN COLUMBIANA...WESTERN BEAVER AND NORTHERN HANCOCK COUNTIES... At 249 PM EDT, a line of thunderstorms was located over Wellsville, moving east at 40 mph. Wind gusts up to 50 mph are possible with this line of storms. Locations impacted include... East Liverpool... Aliquippa... Beaver Falls... Monaca... Wellsville... Ambridge... New Brighton... Beaver... Calcutta... Baden... Rochester... Ohioville... This includes Pennsylvania Turnpike between mile markers 15 and 17. This storm may intensify, so monitor local radio or television stations for additional information and possible warnings from the National Weather Service. A severe thunderstorm watch remains in effect until 900 PM EDT for east central Ohio...western and southwestern Pennsylvania...and northern West Virginia. LAT...LON 4049 8075 4070 8074 4081 8025 4057 8023 TIME...MOT...LOC 1849Z 255DEG 33KT 4059 8069 15
Local storm report, Jun 18, 3:17 PM EDT, 57 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
317 PM EDT SUN JUN 18 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0952 PM NON-TSTM WND GST 2 WNW MURRSYVILLE 40.46N 79.70W
06/17/2017 M98 MPH WESTMORELAND PA MESONET
0301 PM TSTM WND DMG 2 W CLARKS MILLS 41.39N 80.22W
06/18/2017 MERCER PA 911 CALL CENTER
MULTIPLE TREES DOWN IN PERRY TOWNSHIP
0310 PM TSTM WND DMG GREENVILLE 41.41N 80.38W
06/18/2017 MERCER PA 911 CALL CENTER
MULTIPLE TREES DOWN AROUND GREENVILLE
&&
EVENT NUMBER PBZ1701617
EVENT NUMBER PBZ1701618
EVENT NUMBER PBZ1701619
24Local storm report, Jun 18, 3:43 PM EDT, 31 minutes before
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</html>The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 2:41 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer, Venango | 34 min |
| Jun 18, 2:51 PM EDT | Special Weather Statement | PBZ | Beaver | 24 min |
| Jun 18, 3:10 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 35 min |
| Jun 18, 3:14 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Forest, Mercer, Venango | 46 min |
| Jun 18, 3:27 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence | 33 min |
| Jun 18, 3:57 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Forest, Jefferson, Venango | 48 min |
| Jun 18, 4:50 PM EDT | Special Weather Statement | PBZ | Allegheny | 25 min |
| Jun 18, 5:29 PM EDT | Special Weather Statement | PBZ | Armstrong | 31 min |
| Jun 18, 6:55 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 35 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2017Severe Thunderstorm Warnings in West Virginia, 2017Severe Thunderstorm Warnings in Ohio, 2017Every severe thunderstorm warning in 2017
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.