Severe Thunderstorm Warning 162, NWS Pittsburgh, PA

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
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.

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

OHZ050-059-069-PAZ029-031-WVZ002>004-251930-
Monroe-Jefferson-Belmont-Greene-Washington-Marshall-Brooke-Ohio-
252 PM EDT Tue Aug 25 2020

...AN AREA OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING SMALL HAIL
AND GUSTY WIND WILL AFFECT SOUTH CENTRAL JEFFERSON...NORTHEASTERN
MONROE...CENTRAL BELMONT...SOUTHWESTERN WASHINGTON...NORTHWESTERN
GREENE...OHIO...MARSHALL AND SOUTHERN BROOKE COUNTIES...

At 252 PM EDT, strong thunderstorms were clustered near Martins
Ferry, moving east at 30 mph.

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

Locations impacted include...
Wheeling...                       Moundsville...
Martins Ferry...                  St. Clairsville...
Bellaire...                       Warwood...
Bethlehem...                      West Liberty...
Triadelphia...                    Clearview...
Valley Grove...                   Shadyside...

This includes the following highways...
  Interstate 70 in Ohio between mile markers 215 and 225.
  Interstate 70 in West Virginia between mile markers 0 and 14.
  Interstate 70 in Pennsylvania between mile markers 0 and 12.
  Interstate 79 in Pennsylvania between mile markers 29 and 30.

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

LAT...LON 3991 8121 4022 8071 4011 8018 3976 8049
TIME...MOT...LOC 1852Z 283DEG 26KT 4009 8079

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

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

0201 PM     TSTM WND DMG     WORTHINGTON             40.84N  79.63W
08/25/2020                   ARMSTRONG          PA   PUBLIC

            TREES AND POWER LINES REPORTED DOWN IN WORTHINGTON PA

&&

EVENT NUMBER PBZ2001238

BROWN