Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 155, NWS Pittsburgh, PA

August 25, 20205 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 25, 2020, 2:07 PM EDT for 5 counties in Pennsylvania. It was in force for 38 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: Aug 25, 2020, 2:07 PM EDT (18:07 UTC)
Expired: Aug 25, 2020, 2:45 PM EDT
In force: 38 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Armstrong County, PA, Butler County, PA, Clarion County, PA, Mercer County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 76 km from the middle of the area, began a volume at 18:08 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
Aug 25, 1:21 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 6.1 hours before the alert went out and 84 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: 1286 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 1021 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.1

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 Aug 25, 12:42 PM EDT, 1 hour 25 minutes earlier.

Area forecast discussion, Aug 25, 12:42 PM EDT, 1 hour 25 minutes before

Area Forecast Discussion
National Weather Service Pittsburgh PA
1242 PM EDT Tue Aug 25 2020

.SYNOPSIS...
Warm and humid conditions will continue today with scattered
thunderstorms, some of which may generate damaging wind gusts.

&&

.NEAR TERM /THROUGH TONIGHT/...
The next in series of shortwaves is generating more convection this
afternoon as per scattered activity developing off Lake Erie. More
widespread storms are anticipated with the boundary sagging toward
the I 70 corridor. This activity is expected to congeal into a linear
MCS which will plough across the mid Atlantic region early this
evening.

For the upper Ohio, the area remains under the threat for scattered
severe risk with the primary hazard from damaging wind. Shear and
increasing instability favor multicell to short bowing segments with
eventual congeal into an organized MCS still possible as mentioned
above. The better chance for widespread severe is indicated along,
and south of I 70 beginning either side of 4 pm.

Convection will weaken and wane into the late evening and overnight
hours as shortwave ridging suppresses residual showers and clouds.

&&

.SHORT TERM /WEDNESDAY THROUGH WEDNESDAY NIGHT/...
Another shortwavew is projected for Wednesday passage. That system
will pull the frontal boundary north and eastward once again and
destabilize the area via increased dewpoints and warmth. Deep layer
shear remains favorable for severe and the Upr OH rmns under a slight
svr risk. Primary problem will again be damaging gusts during the mid
afternoon with weakening toward evening.

&&

.LONG TERM /THURSDAY THROUGH TUESDAY/...
Flow is expected be remain relatively fast and become more zonal for
the latter half of the week. This will support a series of
progressive shortwave passages with periodic rain chance fueled by
the northern fringe of tropical moisture funneling over the mid
Atlantic region. A stronger cold front/trough passage is indicated
for the weekend to continue the rain chance. Expect seasonable
temperature throughout.

&&

.AVIATION /18Z TUESDAY THROUGH SUNDAY/...
Storms will advance through the entire region this afternoon as a
shortwave crosses the Great Lakes. Strong wind gusts are likely to be
embedded within convection due deep wind shear aloft and dry air
accelerated to the surface; MVFR to IFR vis may occur during heavy
downpours. In areas separated from convection, VFR will prevail.

Showers and storms will fizzle out after dark; with dry air advancing
into the region VFR will prevail.

A new shortwave tomorrow will create thunderstorm chances again in
the afternoon in eastern Ohio; added VCTS for ZZV but more sites may
need to be added later.

.Outlook...
VFR conditions will largely prevail through much of this week with
only periodic restrictions due to thunderstorms and morning fog.

&&

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

&&

Hazardous weather outlook, Aug 25, 1:26 PM EDT, 41 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
126 PM EDT Tue Aug 25 2020

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021-509>514-261730-
Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-
Jefferson OH-Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-
Forest-Lawrence-Butler-Clarion-Jefferson PA-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-
126 PM EDT Tue Aug 25 2020

...SEVERE THUNDERSTORM WATCH 449 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for western Maryland, east
central Ohio, northwest Pennsylvania, southwest Pennsylvania,
western Pennsylvania, northern West Virginia and the 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...Wednesday through Monday.

There is a slight risk for severe thunderstorms on Wednesday. The
primary hazard will be damaging wind gusts.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, Aug 25, 9:33 AM EDT, 4 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
933 AM EDT TUE AUG 25 2020

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

0915 AM     TSTM WND DMG     JEANNETTE               40.33N  79.61W
08/25/2020                   WESTMORELAND       PA   911 CALL CENTER

            TREES DOWN AT 125 ASHBAUGH RD.

&&

EVENT NUMBER PBZ2001233

Local storm report, Aug 25, 9:37 AM EDT, 4 hours 30 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE PITTSBURGH PA
937 AM EDT TUE AUG 25 2020

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

0817 AM     TSTM WND DMG     JEANNETTE               40.33N  79.61W
08/25/2020                   WESTMORELAND       PA   911 CALL CENTER

            TREES DOWN AT 125 ASHBAUGH RD.

&&

CORRECTED EVENT TIME

EVENT NUMBER PBZ2001233

Special weather statement, Aug 25, 1:18 PM EDT, 49 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
118 PM EDT Tue Aug 25 2020

OHZ039-040-048>050-057-058-251800-
Guernsey-Jefferson-Tuscarawas-Coshocton-Harrison-Muskingum-Carroll-
118 PM EDT Tue Aug 25 2020

...AN AREA OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING SMALL HAIL
AND GUSTY WIND WILL AFFECT CENTRAL HARRISON...WEST CENTRAL
JEFFERSON...NORTHWESTERN GUERNSEY...COSHOCTON...NORTHEASTERN
MUSKINGUM...SOUTHWESTERN CARROLL AND TUSCARAWAS COUNTIES...

At 117 PM EDT, strong thunderstorms were clustered near Farmerstown,
or 11 miles southwest of Dover, moving southeast at 35 mph.

Wind gusts up to 55 mph and small hail are possible with these
storms.

Locations impacted include...
New Philadelphia...               Dover...
Coshocton...                      Uhrichsville...
Freeport...                       Newcomerstown...
Dennison...                       Strasburg...
West Lafayette...                 Sugarcreek...
Gnadenhutten...                   Tuscarawas...

This includes  Interstate 77 in Ohio between mile markers 51 and 94.

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

LAT...LON 4046 8218 4044 8168 4063 8167 4065 8147
      4067 8146 4066 8144 4065 8144 4065 8133
      4037 8084 3998 8183 4035 8219
TIME...MOT...LOC 1717Z 305DEG 31KT 4045 8167

Local storm report, Aug 25, 1:35 PM EDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
135 PM EDT TUE AUG 25 2020

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

0133 PM     TSTM WND DMG     1 NNW PETROLIA          41.03N  79.72W
08/25/2020                   BUTLER             PA   911 CALL CENTER

            TREES AND WIRES DOWN IN WASHINGTON TOWNSHIP

&&

EVENT NUMBER PBZ2001234

SKH

Local storm report, Aug 25, 1:47 PM EDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
147 PM EDT TUE AUG 25 2020

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

0140 PM     TSTM WND DMG     FAIRVIEW                41.01N  79.74W
08/25/2020                   BUTLER             PA   911 CALL CENTER

            TREES AND WIRES DOWN; POWER OUT NEAR FAIRVIEW AREA.

&&

EVENT NUMBER PBZ2001235

SKH

Special weather statement, Aug 25, 2:00 PM EDT, 7 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
200 PM EDT Tue Aug 25 2020

OHZ057-251830-
Muskingum-
200 PM EDT Tue Aug 25 2020

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY
WIND WILL AFFECT SOUTHWESTERN MUSKINGUM COUNTY...

At 200 PM EDT, a strong thunderstorm was located near Somerset,
moving east at 25 mph.

Wind gusts up to 55 mph and small hail are possible with this storm.

Locations impacted include...
South Zanesville...               Philo...
Fultonham...                      Cannelville...
Duncan Falls...                   East Fultonham...

This includes  Interstate 70 in Ohio near mile marker 143.

LAT...LON 3995 8223 3986 8185 3976 8190 3977 8207
      3982 8208 3982 8217 3991 8216 3991 8223
TIME...MOT...LOC 1800Z 289DEG 20KT 3988 8222

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 6:41 AM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Westmoreland	19 min
Aug 25, 7:10 AM EDT	Special Weather Statement	PBZ	Westmoreland	20 min
Aug 25, 7:41 AM EDT	Special Weather Statement	PBZ	Westmoreland	49 min
Aug 25, 7:55 AM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	50 min
Aug 25, 8:06 AM EDT	Special Weather Statement	PBZ	Allegheny	24 min
Aug 25, 8:18 AM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	27 min
Aug 25, 9:05 AM EDT	Severe Thunderstorm Warning	PBZ	Fayette	25 min
Aug 25, 11:58 AM EDT	Severe Thunderstorm Warning	PBZ	Mercer, Venango	32 min
Aug 25, 12:29 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Forest, Mercer, Venango	46 min
Aug 25, 1:12 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Mercer, Venango	48 min
Aug 25, 1:36 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion	39 min
Aug 25, 2:09 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Indiana, Westmoreland	51 min
Aug 25, 2:26 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	23 min
Aug 25, 2:29 PM EDT	Special Weather Statement	PBZ	Washington	31 min
Aug 25, 2:34 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	41 min
Aug 25, 3:07 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	38 min
Aug 25, 3:15 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Fayette, Indiana, Westmoreland	45 min
Aug 25, 3:39 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington	51 min
Aug 25, 4:00 PM EDT	Special Weather Statement	PBZ	Allegheny	30 min
Aug 25, 4:08 PM EDT	Special Weather Statement	PBZ	Westmoreland	37 min
Aug 25, 4:13 PM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	32 min
Aug 25, 4:20 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene	40 min
Aug 25, 4:40 PM EDT	Special Weather Statement	PBZ	Fayette, Washington	50 min
Aug 25, 5:01 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	29 min
Aug 25, 5:05 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	25 min
Aug 25, 5:34 PM EDT	Special Weather Statement	PBZ	Fayette	26 min
Aug 25, 1:18 PM EDT	Special Weather Statement	PBZ	Coshocton, Harrison, Tuscarawas	42 min
Aug 25, 1:43 PM EDT	Severe Thunderstorm Warning	PBZ	Guernsey, Harrison, Tuscarawas	32 min
Aug 25, 1:53 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Tuscarawas	52 min
Aug 25, 1:57 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Guernsey, Harrison, Muskingum, Tuscarawas	48 min
Aug 25, 2:00 PM EDT	Special Weather Statement	PBZ	Muskingum	30 min
Aug 25, 2:23 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Harrison, Jefferson	52 min
Aug 25, 2:47 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton	43 min
Aug 25, 2:52 PM EDT	Special Weather Statement	PBZ	Belmont	38 min
Aug 25, 3:11 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Guernsey, Muskingum, Noble	49 min
Aug 25, 3:26 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Coshocton, Guernsey, Harrison, Muskingum, Noble and 1 more	49 min
Aug 25, 3:35 PM EDT	Special Weather Statement	PBZ	Monroe	25 min
Aug 25, 3:57 PM EDT	Severe Thunderstorm Warning	PBZ	Guernsey, Monroe, Muskingum, Noble	29 min
Aug 25, 8:55 AM EDT	Special Weather Statement	PBZ	Tucker	35 min
Aug 25, 3:13 PM EDT	Special Weather Statement	PBZ	Wetzel	32 min
Aug 25, 5:03 PM EDT	Severe Thunderstorm Warning	PBZ	Preston, Tucker	42 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Every severe thunderstorm warning in 2020

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.