Special Weather Statement, NWS Pittsburgh, PA

Area Forecast Discussion
National Weather Service Pittsburgh PA
417 PM EDT Wed Aug 11 2021

.SYNOPSIS...
Warmth, humidity, and periodic showers and thunderstorms
can be expected until cold frontal passage late this week.

&&

.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
Aftn convection is waning for most areas with passage of the support
vort center/possible MCV, but additional storms continue to fire in
the convergence zone/outflow boundary near I 70 as sly flow
intensifies on the van of the upstream trough. Instability near ZZV
wl not be alleviated soon given temperature and dewpoint, but of the
rest of has been rained on and stabilized.

That may be important given the upstream MCS plowing into wrn OH.
That is HRRR and RAP mdl projected to weaken and dvlp nwd with the
shrtwv support. Progress of that system is being monitored but POPs
have been updated and that system is expected to impact zones from
ZZV to FKL given outflow boundary progress. The severe threat will
again be from damaging wind gusts.

&&

.SHORT TERM /6 AM THURSDAY MORNING THROUGH FRIDAY/...
Thunderstorm chances continue into Thursday as embedded shortwaves
advance through the base of an elongated trough center near the
Great Lakes.

Temperature wl also continue to be above average with the support of
warm, moist advection. Thursday is still marginally approaching Heat
Advisory headlines as Heat Index values are currently forecasted to
be in the upper-90s in portions of our region, but clouds and rain
chance are expected to maintain that margin so no headline today.

&&

.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...
A cold front is anticipated to enter the Ohio River Valley late
Friday/early Saturday. Therefore, thunderstorm chances will persist
ahead along the boundary. The frontal passage will moderate
temperature back to climatological norms for the weekend.

Depending on the position of high pressure, showers may return to
the region starting Monday and carry into Tuesday as warm, moist air
returns from the south.

&&

.AVIATION /20Z WEDNESDAY THROUGH MONDAY/...
Restrictions likely with afternoon/early evening convection.

.Outlook...
Periodic restrictions in showers/tstms are likely thru Sat with a
series of crossing disturbances.

&&

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

&&

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
458 PM EDT Wed Aug 11 2021

PAZ009-014>016-020>023-029-031-073>076-WVZ001>004-012-021-509>514-
122100-
Forest-Butler-Clarion-Jefferson PA-Beaver-Allegheny-Armstrong-
Indiana-Washington-Greene-Westmoreland-
Higher Elevations of Westmoreland-Fayette-
Higher Elevations of Fayette-Hancock-Brooke-Ohio-Marshall-Wetzel-
Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
458 PM EDT Wed Aug 11 2021

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

.DAY ONE...Tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

A Marginal Risk of severe weather is outlooked for Thursday, with
damaging wind being the most prominent threat.

.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-PAZ007-008-013-122100-
Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH-
Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Lawrence-
458 PM EDT Wed Aug 11 2021

...SEVERE THUNDERSTORM WATCH 429 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

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

.DAY ONE...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...Thursday through Tuesday.

A Marginal Risk of severe weather is outlooked for Thursday, with
damaging wind being the most prominent threat.

.SPOTTER INFORMATION STATEMENT...

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

Special Weather Statement
National Weather Service Pittsburgh PA
643 PM EDT Wed Aug 11 2021

PAZ007-008-013-112315-
Venango PA-Lawrence PA-Mercer PA-
643 PM EDT Wed Aug 11 2021

...Strong thunderstorms will impact portions of Mercer, northwestern
Venango and northern Lawrence Counties through 715 PM EDT...

At 643 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Meadville to near Hermitage to near
Maplewood Park. Movement was east southeast at 40 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Hermitage, Sharon, Grove City, Sharpsville, Greenville, Sugarcreek,
Farrell, New Wilmington, Mercer, Pulaski, Stoneboro, and New Bedford.

This includes the following highways...
  Interstate 79 in Pennsylvania between mile markers 110 and 138.
  Interstate 80 in Pennsylvania between mile markers 0 and 26.
  Interstate 376 in Pennsylvania between mile markers 4 and 11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
western and northwestern Pennsylvania.

&&

LAT...LON 4120 8002 4103 8021 4105 8052 4133 8052
      4149 8038 4149 8000 4160 7983 4162 7983
      4162 7979
TIME...MOT...LOC 2243Z 283DEG 34KT 4161 8017 4128 8040 4113 8062

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

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