Tornado Warning 56, NWS Pittsburgh, PA

927 
WWUS51 KPBZ 032007
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
407 PM EDT Thu Sep 3 2026

PAC085-032030-
/O.CON.KPBZ.TO.W.0056.000000T0000Z-260903T2030Z/
Mercer PA-
407 PM EDT Thu Sep 3 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR
NORTHEASTERN MERCER COUNTY...

At 407 PM EDT, a severe thunderstorm capable of producing a tornado
was located 8 miles east of Greenville, or 17 miles northeast of
Hermitage, moving east at 25 mph.

HAZARD...Tornado and half dollar size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without
         shelter. Mobile homes will be damaged or destroyed. Damage
         to roofs, windows and vehicles will occur. Tree damage is
         likely.

Locations impacted include...
  New Lebanon, Sheakleyville and Maurice K Goddard State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.

Heavy rainfall is hiding this tornado. Do not wait to see or hear the
tornado. Take cover now!

&&

LAT...LON 4140 8032 4148 8032 4148 8013 4149 8013
      4149 8000 4134 8000
TIME...MOT...LOC 2002Z 270DEG 21KT 4143 8028

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN

$$

AK

216 
WWUS51 KPBZ 032014
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
414 PM EDT Thu Sep 3 2026

PAC085-032030-
/O.CON.KPBZ.TO.W.0056.000000T0000Z-260903T2030Z/
Mercer PA-
414 PM EDT Thu Sep 3 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR
NORTHEASTERN MERCER COUNTY...

At 414 PM EDT, a severe thunderstorm capable of producing a tornado
was located 12 miles east of Greenville, or 16 miles west of
Franklin, moving east at 25 mph.

HAZARD...Tornado and half dollar size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without
         shelter. Mobile homes will be damaged or destroyed. Damage
         to roofs, windows and vehicles will occur. Tree damage is
         likely.

Locations impacted include...
  New Lebanon, Sheakleyville and Maurice K Goddard State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.

Heavy rainfall is hiding this tornado. Do not wait to see or hear the
tornado. Take cover now!

&&

LAT...LON 4145 8025 4145 8000 4134 8000 4139 8026
TIME...MOT...LOC 2007Z 281DEG 20KT 4142 8021

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN

$$

AK

046 
WWUS51 KPBZ 032021
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
421 PM EDT Thu Sep 3 2026

PAC085-032030-
/O.CON.KPBZ.TO.W.0056.000000T0000Z-260903T2030Z/
Mercer PA-
421 PM EDT Thu Sep 3 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR
NORTHEASTERN MERCER COUNTY...

At 421 PM EDT, a severe thunderstorm capable of producing a tornado
was located 13 miles east of Greenville, or 15 miles west of
Franklin, moving east at 25 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without
         shelter. Mobile homes will be damaged or destroyed. Damage
         to roofs, windows and vehicles will occur. Tree damage is
         likely.

Locations impacted include...
  New Lebanon and Maurice K Goddard State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.

Heavy rainfall is hiding this tornado. Do not wait to see or hear the
tornado. Take cover now!

&&

LAT...LON 4145 8000 4134 8000 4138 8020 4145 8018
TIME...MOT...LOC 2014Z 281DEG 19KT 4142 8018

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

AK

767 
WWUS51 KPBZ 032027
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
427 PM EDT Thu Sep 3 2026

PAC085-032037-
/O.EXP.KPBZ.TO.W.0056.000000T0000Z-260903T2030Z/
Mercer PA-
427 PM EDT Thu Sep 3 2026

...TORNADO WARNING WILL EXPIRE AT 430 PM EDT FOR NORTHEASTERN MERCER
COUNTY...

The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT
Thursday for a portion of northwest Pennsylvania.

&&

LAT...LON 4145 8018 4145 8000 4134 8000 4138 8020
TIME...MOT...LOC 2021Z 281DEG 19KT 4141 8013

$$

AK

Area Forecast Discussion
National Weather Service Pittsburgh PA
304 PM EDT Thu Sep 3 2026

.WHAT HAS CHANGED...
Severe Thunderstorm Watch issued for our entire area through
10PM. Introduction of an Enhanced Risk (level 3/5) for severe
thunderstorms on Thursday.

&&

.KEY MESSAGES...
1) Rounds of showers and storms continue through Friday night with
associated severe weather threats.

2) Unseasonably warm conditions also continue. Heat Advisories
remain in effect for most of our area through Thursday.

&&

.DISCUSSION...
KEY MESSAGE 1...
Strong 594 dam ridging remains centered across the Southeast
with the axis of the ridge extended north through the Plains.
Locally, we're parked beneath northwest mid-level flow, and
subtle impulses in the flow combined with mesoscale surface
features will continue to be the driver of our thunderstorm
complexes over the next 24-36 hours.

Lingering showers and debris cloud coverage from Thursday morning's
convection will clear out by early afternoon, and satellite imagery
shows clear skies arriving in the wake. This should allow for quick,
efficient heating and diurnal cu development while the atmosphere
recovers. What we then turn our attention to is a developing
thunderstorm complex over lower Michigan that 12z CAMs all dive
southeast and into northwest PA after 3-4pm. Some suggest that there
could be a few discrete cells popping out ahead of the complex in
western PA around that same time. These should have a rather potent
environment to work with as exploration of point soundings
across the area shows 2500-3000 J/kg of MLCAPE, 35-40 knots of
effective shear, and steep mid-levle lapse rates exceeding 7
C/km. One difference from Wednesday is that there appears to be
a bit less mid- level dry air which could support better storm
organization and intensity today. All hazards will be on the
table with both modes; initial discrete cells could become
supercellular and pose a wind, hail, and tornado threat,
especially if dew points don't mix out in time and we're left
with low to mid 70s as noted by the usually drier HRRR. Damaging
wind will be the primary threat with the more linear mode, but
can't ignore 0-3 km shear values nearing 30 knots and the
potential existing for a quick QLCS tornado spin up. Again,
think most likely timing is into NW PA around 4-5pm and
Pittsburgh metro around 6-7pm. A localized Enhanced Risk has
been introduced for the heightened wind threat from Pittsburgh
north. In addition, with repeated rounds of rain the past 24-36
hours, flash flooding will also pose a threat as flash flood
guidance values along I-80 sit around 1-1.25" in one hour. That
may be achieved rather easily this afternoon with a storm or two
in the same area. For that reason, have issued a Flood Watch
through tonight north of Pittsburgh.

Come Friday, some CAMs suggest another early morning push of showers
and storms albeit with less intensity. Finer details on that should
arise later today when we see the initiation of it off to our
northwest. Later Friday, we'll yet again face another MCS threat
with a cluster developing way off to our north in Minnesota and
diving its way through the Great Lakes into our neck of the woods.
Exact track and timing of it is even more uncertain as its several
domino pieces away from where were at currently, and morning
convection will have a say in afternoon intensity as well. The front
itself should then pass through during the late afternoon on Friday
ushering in a drier airmass as surface high pressure arrives from
the north, though many of the 12z CAMs now think we have yet another
car in the MCS train riding the southeastern periphery of the
surface high and perhaps impacting us again overnight Friday night.
Not putting a ton of stock in this possibility yet, but it's
intriguing that a couple models are coming to a similar solution.

KEY MESSAGE 2...
Aside from the storms, unseasonably warm conditions continue
through Thursday. Heat risk will remain in the major category
with pockets of extreme in the valleys and urban areas where
temperatures reach the low to mid 90s and dew points in the 70s
resulting in heat indices exceeding 100F. Some localized cooler
areas are possible underneath increased cloud cover form early
morning storms, but still expect that we'll be able to recover
and heat well.

&&

.AVIATION /19Z THURSDAY THROUGH TUESDAY/...
VFR areawide at present, but we are monitoring convection to the
northwest over lower Michigan that most models dive southeast
into our region during the late afternoon and evening hours.
Initial discrete cells will likely organize into a fairly potent
squall line, with wind gusts in the 40-50 knot range (and
perhaps a bit higher) possible from PIT on north. Downpours with
IFR/LIFR visibility are also likely, as is frequent lightning.
Timing looks to be generally between 20Z and 02Z from north to
south. Have used 3 hour TEMPO groups at each terminal to
illustrate the most likely timing, while allowing for some
modest uncertainty.

A period of VFR is expected in the wake of the MCS, and some
MVFR to IFR ceilings/visibilities are expected during the
predawn hours with lingering low-level moisture. A couple of
models suggest some scattered morning showers/storms. Confidence
is not high at present, and only included precip at FKL/DUJ for
now. Past 14Z, VFR should reestablish, but another MCS with
even more uncertain timing is possible during the
afternoon/evening hours of Friday.

&&

.PBZ WATCHES/WARNINGS/ADVISORIES...
PA...Flood Watch until midnight EDT tonight for PAZ007>009-015-016.
OH...None.
WV...None.

&&

DISCUSSION...MLB
AVIATION...CL

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
303 PM EDT Thu Sep 3 2026

OHZ039>041-048>050-057>059-068-069-PAZ013-014-020>022-029-031-
073>078-WVZ001>004-012-021-509>514-041915-
Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH-
Muskingum-Guernsey-Belmont-Noble-Monroe-Lawrence-Butler-Beaver-
Allegheny-Armstrong-Washington-Greene-Westmoreland-
Higher Elevations of Westmoreland-Fayette-
Higher Elevations of Fayette-Indiana-Higher Elevations of Indiana-
Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
303 PM EDT Thu Sep 3 2026

...SEVERE THUNDERSTORM WATCH 649 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for east central Ohio, southwest
Pennsylvania, western Pennsylvania, and northern 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.

Showers and thunderstorms are expected this afternoon and into the
evening. Some storms could be severe with damaging wind, large hail,
a tornado, and heavy rain all possible threats.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Strong storms are possible Friday afternoon as well with again all
hazards possible.

.SPOTTER INFORMATION STATEMENT...

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

PAZ007>009-015-016-041915-
Mercer-Venango-Forest-Clarion-Jefferson PA-
303 PM EDT Thu Sep 3 2026

...FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...SEVERE THUNDERSTORM WATCH 649 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for northwest Pennsylvania and
western Pennsylvania.

.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.

   Flood Watch.
   Severe Thunderstorm Watch.

Showers and thunderstorms are expected this afternoon and into the
evening. Some storms could be severe with damaging wind, large hail,
a tornado, and heavy rain all possible threats.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Strong storms are possible Friday afternoon as well with again all
hazards possible.

.SPOTTER INFORMATION STATEMENT...

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

MLB

Preliminary Local Storm Report
National Weather Service Pittsburgh PA
1002 AM EDT Thu Sep 3 2026

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

0805 AM     Tstm Wnd Dmg     1 W Irwin               40.33N 79.71W
09/03/2026                   Westmoreland       PA   911 Call Center

            Wires down. Time estimated from radar.

&&

Preliminary Local Storm Report
National Weather Service Pittsburgh PA
1004 AM EDT Thu Sep 3 2026

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

0821 AM     Tstm Wnd Dmg     2 E Calumet-Norvelt     40.21N 79.45W
09/03/2026                   Westmoreland       PA   911 Call Center

            Wires down. Time estimated from radar.

&&

Preliminary Local Storm Report
National Weather Service Pittsburgh PA
1006 AM EDT Thu Sep 3 2026

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

0745 AM     Tstm Wnd Dmg     3 W Avonmore            40.53N 79.53W
09/03/2026                   Westmoreland       PA   911 Call Center

            Wires down. Time estimated from radar.

&&

CL