Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 182, NWS Pittsburgh, PA

August 19, 2017Allegheny County, Washington County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 19, 2017, 4:19 PM EDT for Allegheny County, Washington County, Pennsylvania. It was in force for 41 min. 2 reports 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: Aug 19, 2017, 4:19 PM EDT (20:19 UTC)
Expired: Aug 19, 2017, 5:00 PM EDT
In force: 41 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Allegheny County, PA, Washington County, PA

The radar

The Pittsburgh radar (KPBZ), 26 km from the middle of the area, began a volume at 20:22 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
Aug 19, 4:20 PM EDT	TSTM WND DMG	9 Sw Imperial-Enlow, PA	NUMEROUS TREES DOWN
Aug 19, 4:45 PM EDT	TSTM WND DMG	4 N Canonsburg, PA	NUMEROUS TREES DOWN

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 1 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Aug 19, 2:45 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Pittsburgh, PA (KAGC), launched 12:00Z, 8.3 hours before the alert went out and 14 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: 4 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 898 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

573 
WUUS51 KPBZ 192019
SVRPBZ
PAC003-125-192100-
/O.NEW.KPBZ.SV.W.0182.170819T2019Z-170819T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
419 PM EDT SAT AUG 19 2017

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Northern Washington County in southwestern Pennsylvania...
  Southern Allegheny County in southwestern Pennsylvania...

* Until 500 PM EDT.

* At 419 PM EDT, a severe thunderstorm was located 7 miles northeast
  of Avella, moving east at 30 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar. 

  IMPACT...Expect damage to trees and power lines, resulting in some 
           power outages. 

* Locations impacted include...
  Pittsburgh...                     Mount Lebanon...
  Bethel Park...                    McMurray...
  McKeesport...                     Canonsburg...
  Gastonville...                    West Mifflin...
  Baldwin...                        Upper St. Clair...
  Scott Township...                 Whitehall...

This includes  Interstate 79 in Pennsylvania between mile markers 22
and 29.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a building.

Please report severe weather by calling 412-262-1988, posting to 
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH. 

&&

LAT...LON 4014 7993 4034 8052 4035 8052 4044 8038
      4040 7984
TIME...MOT...LOC 2019Z 283DEG 24KT 4037 8039 

HAIL...<.75IN
WIND...60MPH
 
$$

Fries

1 follow-up statement

357 
WWUS51 KPBZ 192043
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
443 PM EDT SAT AUG 19 2017

PAC003-125-192100-
/O.CON.KPBZ.SV.W.0182.000000T0000Z-170819T2100Z/
Washington PA-Allegheny PA-
443 PM EDT SAT AUG 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR CENTRAL WASHINGTON AND SOUTHERN ALLEGHENY COUNTIES...

At 442 PM EDT, a severe thunderstorm was located over Cecil-Bishop,
or near Canonsburg, moving east at 30 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar. 

IMPACT...Expect damage to trees and power lines, resulting in some 
         power outages. 

Locations impacted include...
Pittsburgh...                     Mount Lebanon...
Bethel Park...                    McMurray...
McKeesport...                     Canonsburg...
Gastonville...                    West Mifflin...
Baldwin...                        Upper St. Clair...
Scott Township...                 Whitehall...

This includes  Interstate 79 in Pennsylvania between mile markers 22
and 30.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a building.

Please report severe weather by calling 412-262-1988, posting to 
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH. 

&&

LAT...LON 4028 8035 4036 8031 4043 8020 4040 7984
      4014 7993
TIME...MOT...LOC 2042Z 283DEG 24KT 4033 8019 

HAIL...<.75IN
WIND...60MPH
 
$$

Fries

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 Aug 19, 2:25 PM EDT, 1 hour 54 minutes earlier.

Area forecast discussion, Aug 19, 2:25 PM EDT, 1 hour 54 minutes before

Area Forecast Discussion
National Weather Service Pittsburgh PA
225 PM EDT Sat Aug 19 2017

.SYNOPSIS...
Thunderstorms will accompany the encroachment of a cold front
this afternoon and early evening.

&&

.NEAR TERM /THROUGH TONIGHT/...
The late  afternoon update featured further adjustments to near
term POPs as per the latest radar and high res model trends.
Insolation in the wake of morning clouds and weak convection has
destabilized the Upper Ohio airspace under an encroaching upper
trough. Given the available boundary layer moisture with that
warming, convection is likely to continue developing along the
associated weak surface reflection/reinforcing front emerging
off the Great Lakes. Pockets of dry aloft with marginal shear
are expected to maintain severe potential for wind gusts and
hail until passage of the system early this evening.

&&

.SHORT TERM /SUNDAY THROUGH TUESDAY/...
Building high pressure in the wake of the aforementioned system
will result in a dry and seasonable Sunday with slightly lower
dewpoints/humidity.

Warm, moist advection with flat ridging in advance of a midwestern
shortwave as per the latest model solutions indicate increased
humidity with a rapid temperature moderation above the averages
for Monday.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
The aforementioned midwest trough/associated front are likely to
provide the next precip chance by Tuesday. Eastern CONUS troughing
is then forecast to support temperatures a few degrees under
the averages for the remainder of the week.

&&

.AVIATION /18Z SATURDAY THROUGH THURSDAY/...
Numerous thunderstorms can be expected as a cold front crosses
the region this afternoon/early evening. VCTS and tempo TS were
included for terminals with the most likely timing.

VFR will return in the wake of the showers and thunderstorms,
although with clearing and winds calming, some pre-dawn fog
could develop. This will likely be dependent on the extent and
amount of rainfall this evening.

Surface flow will generally remain from the west at 10kts with
occasional gusts to 15kts. Winds will then calm tonight as high
pressure begins to build in.

.Outlook...
Widespread restriction potential returns with a late Tue/early
Wed cold front.

&&

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

&&

Hazardous weather outlook, Aug 19, 2:47 PM EDT, 1 hour 32 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
247 PM EDT Sat Aug 19 2017

MDZ001-WVZ012-021-509>514-201900-
Garrett-Wetzel-Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
247 PM EDT Sat Aug 19 2017

This Hazardous Weather Outlook is for western Maryland and northern
West Virginia.

.DAY ONE...This Afternoon 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...

Weather spotters are encouraged to report significant weather
 conditions according to Standard Operating Procedures.

OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-029-
031-073>076-WVZ001>004-201900-
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-
247 PM EDT Sat Aug 19 2017

...SEVERE THUNDERSTORM WATCH 457 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for east central Ohio, northwest
Pennsylvania, southwest Pennsylvania, west central Pennsylvania,
western Pennsylvania, northern West Virginia and northern panhandle
of West Virginia.

.DAY ONE...This Afternoon and Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

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, Aug 19, 2:27 PM EDT, 1 hour 52 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
227 PM EDT SAT AUG 19 2017

OHZ048-057-191900-
Coshocton-Muskingum-
227 PM EDT SAT AUG 19 2017

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING HAIL AND GUSTY WIND
WILL AFFECT SOUTHERN COSHOCTON AND NORTHERN MUSKINGUM COUNTIES...

At 227 PM EDT, a strong thunderstorm was located near Frazeysburg, or
15 miles west of Coshocton, moving east at 30 mph.

Wind gusts up to 45 mph and hail up to the size of nickels are
possible with this storm.

Locations impacted include...
Coshocton...                      West Lafayette...
Dresden...                        Frazeysburg...
Conesville...                     Plainfield...
Otsego...                         New Guilford...
Cooperdale...

This storm may intensify, so monitor local radio or television
stations for additional information and possible warnings from the
National Weather Service.

LAT...LON 4030 8219 4035 8172 4015 8171 4015 8172
      4008 8172 4011 8219 4024 8218 4024 8220
TIME...MOT...LOC 1827Z 267DEG 28KT 4021 8214

Fries

Local storm report, Aug 19, 2:47 PM EDT, 1 hour 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
247 PM EDT SAT AUG 19 2017

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

0221 PM     HAIL             3 WSW NEW PHILADELPHIA  40.47N  81.49W
08/19/2017  M1.75 INCH       TUSCARAWAS         OH   SOCIAL MEDIA

0221 PM     HAIL             3 WSW NEW PHILADELPHIA  40.47N  81.50W
08/19/2017  M1.00 INCH       TUSCARAWAS         OH   TRAINED SPOTTER

0226 PM     HAIL             NEW PHILADELPHIA        40.49N  81.44W
08/19/2017  E1.00 INCH       TUSCARAWAS         OH   PUBLIC

&&

EVENT NUMBER PBZ1702015
EVENT NUMBER PBZ1702016
EVENT NUMBER PBZ1702017

Special weather statement, Aug 19, 3:32 PM EDT, 47 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
332 PM EDT SAT AUG 19 2017

OHZ039-049-192000-
Tuscarawas-Harrison-
332 PM EDT SAT AUG 19 2017

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING HAIL AND GUSTY WIND
WILL AFFECT CENTRAL HARRISON AND SOUTHEASTERN TUSCARAWAS COUNTIES...

At 332 PM EDT, a strong thunderstorm was located near Freeport,
moving east at 25 mph.

Wind gusts up to 45 mph and hail up to the size of nickels are
possible with this storm.

Locations impacted include...
Cadiz...                          New Athens...
Tippecanoe...                     Stillwater...
Deersville...                     Clendening Lake...
Tappan Lake...

This storm may intensify, so monitor local radio or television
stations for additional information and possible warnings from the
National Weather Service.

LAT...LON 4026 8139 4037 8140 4036 8092 4017 8096
TIME...MOT...LOC 1932Z 283DEG 22KT 4030 8127

Fries

Local storm report, Aug 19, 4:02 PM EDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
402 PM EDT SAT AUG 19 2017

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

0327 PM     TSTM WND DMG     2 SSW MALVERN           40.67N  81.20W
08/19/2017                   CARROLL            OH   911 CALL CENTER

            ONE LARGE TREE DOWN

&&

EVENT NUMBER PBZ1702018

Local storm report, Aug 19, 4:15 PM EDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
415 PM EDT SAT AUG 19 2017

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

0318 PM     TSTM WND DMG     OHIOVILLE               40.68N  80.48W
08/19/2017                   BEAVER             PA   911 CALL CENTER

            SEVERAL TREES DOWN

0322 PM     TSTM WND DMG     MIDLAND                 40.64N  80.46W
08/19/2017                   BEAVER             PA   911 CALL CENTER

            SEVERAL TREES DOWN

0325 PM     TSTM WND DMG     1 S INDUSTRY            40.64N  80.41W
08/19/2017                   BEAVER             PA   SOCIAL MEDIA

            SMALL TREES DOWN

0325 PM     HAIL             1 S INDUSTRY            40.64N  80.41W
08/19/2017  E1.00 INCH       BEAVER             PA   SOCIAL MEDIA

            MINOR HAIL DAMAGE TO CARS

0339 PM     TSTM WND DMG     ALIQUIPPA               40.62N  80.25W
08/19/2017                   BEAVER             PA   911 CALL CENTER

            SEVERAL TREES DOWN

&&

EVENT NUMBER PBZ1702019
EVENT NUMBER PBZ1702020
EVENT NUMBER PBZ1702021
EVENT NUMBER PBZ1702022
EVENT NUMBER PBZ1702023

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 3:10 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	50 min
Aug 19, 3:14 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	46 min
Aug 19, 3:16 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler	44 min
Aug 19, 3:47 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler	28 min
Aug 19, 3:54 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Butler, Westmoreland	51 min
Aug 19, 4:32 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Westmoreland	43 min
Aug 19, 4:36 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana	39 min
Aug 19, 4:43 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Jefferson	32 min
Aug 19, 4:46 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	44 min
Aug 19, 5:04 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	28 min
Aug 19, 5:07 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Westmoreland	53 min
Aug 19, 5:16 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Washington, Westmoreland	44 min
Aug 19, 5:34 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	24 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.