Severe Thunderstorm Warning 191, NWS Pittsburgh, PA

Area Forecast Discussion
National Weather Service Pittsburgh PA
746 AM EDT Fri Aug 28 2020

.SYNOPSIS...
Strong to severe thunderstorms are possible again today. Widespread
rain is expected Friday night through Saturday.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Showers and thunderstorms will continue today with a crossing weak
sfc low and advancing upper trough amid increasing deep tropical
moisture with the remnants of Laura. Isolated severe storms are
possible during the afternoon hours with strong, damaging winds being
the primary threat. Training storms may also cause localized flash
flooding. Copious cloud cover, which will keep surface temperatures
down, will be a limiting factor today.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY/...
The remnants of Hurricane Laura will cross the Mid-Atlantic region
Saturday. It will be kept south of the area by a crossing cold front
that will eventually merge with the remnants late Saturday. Deep
atmospheric moisture on the northern periphery of Laura's remnants
will work to create efficient rainfall along the crossing front.
However, current model data has decreased the threat for convection
with the front which will also lessen the flood risk.

The area will dry out on Sunday with crossing high pressure.

&&

.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
Dry conditions will continue through Monday. Precipitation chances
return on Tuesday with a crossing trough. Near-average temperatures
are expected through the long term.

&&

.AVIATION /12Z FRIDAY THROUGH TUESDAY/...
MVFR/IFR cigs with localized LIFR conditions around and north of KPIT
will slowly lift through the morning hours with increased diurnal
heating/mixing. FKL/DUJ likely to see restrictions persist longest
given proximity to stationary boundary sitting just north, though
morning convection may disrupt LIFR conditions sooner than
forecasted.

A warm, moist environment combined with a passing shortwave trough
will allow for showers and thunderstorms to develop through the day.
Uncertainty remains in timing and areal coverage of convection given
the lack of defining sfc feature, plus the impact convection
occurring north of I-80 will have for future development. That said,
most hi- res models agree that it will be fairly active and likely
impact all terminals, with best timing occurring somewhere from the
late morning to the late afternoon hours.

Loss of diurnal heating will likely trend convection down overnight,
however additional shortwave troughs may keep sct shra continuing,
with low confidence on location of these showers. Moisture pooling as
the sfc stationary boundary remains to the north means MVFR/IFR
restrictions likely Saturday morning, with localized LIFR conditions.

.Outlook...
Restrictions will generally persist Saturday with remnant moisture
from Laura continuing precipitation chances. Conditions will improve
through Sunday after the passage of a sfc cold front earlier in the
morning.

&&

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

&&

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
405 AM EDT Fri Aug 28 2020

OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-029-
031-073-075-WVZ001>004-012-290815-
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-Fayette-Hancock-Brooke-Ohio-
Marshall-Wetzel-
405 AM EDT Fri Aug 28 2020

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

.DAY ONE...Today and tonight.

Scattered severe storms are possible again this afternoon and
evening. The main threat will be damaging wind gusts. Storms will
also produce heavy downpours which could lead to localized flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Periods of isolated heavy rain could lead to localized flooding on
Saturday.

.SPOTTER INFORMATION STATEMENT...

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

MDZ001-PAZ074-076-WVZ021-509>514-290815-
Garrett-Westmoreland Ridges-Fayette Ridges-Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
405 AM EDT Fri Aug 28 2020

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

.DAY ONE...Today and tonight.

Scattered severe storms are possible again this afternoon and
evening. The main threat will be damaging wind gusts. Storms will
also produce heavy downpours which could lead to localized flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Isolated severe storms are possible again Saturday. The main threat
will be damaging wind gusts. Storms will also produce heavy downpours
which could lead to localized flooding.

.SPOTTER INFORMATION STATEMENT...

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

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
808 AM EDT FRI AUG 28 2020

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

0624 PM     TSTM WND DMG     MINERVA JCT             40.72N  81.15W
08/27/2020                   CARROLL            OH   SOCIAL MEDIA

            NUMEROUS TREES DOWN ON ROADWAYS AND POWER LINES AROUND
            MINERVA.

0633 PM     TSTM WND DMG     MECHANICSTOWN           40.62N  80.95W
08/27/2020                   CARROLL            OH   DEPT OF HIGHWAYS

            COUNTY DOT REPOTING NUMEROUS TREES DOWN THROUGHOUT THE
            COUNTY. TIME AND LOCATION ESTIMATED BASED ON RADAR.

0657 PM     TSTM WND DMG     CASTLE SHANNON          40.37N  80.02W
08/27/2020                   ALLEGHENY          PA   SOCIAL MEDIA

            REPORT OF TREE DOWN ON HOUSE.

0715 PM     TSTM WND DMG     DELLROY                 40.56N  81.20W
08/27/2020                   CARROLL            OH   DEPT OF HIGHWAYS

            COUNTY DOT REPOTING NUMEROUS TREES DOWN THROUGHOUT THE
            COUNTY. TIME AND LOCATION ESTIMATED BASED ON RADAR.

&&

EVENT NUMBER PBZ2001310
EVENT NUMBER PBZ2001311
EVENT NUMBER PBZ2001312
EVENT NUMBER PBZ2001313

JF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
843 AM EDT FRI AUG 28 2020

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

0500 PM     TSTM WND DMG     KNOX                    41.23N  79.54W
08/27/2020                   CLARION            PA   SOCIAL MEDIA

            REPORT OF MANY TREES AND POLES BLOWN OVER AROUND KNOX.

0520 PM     TSTM WND DMG     3 S SLIGO               41.07N  79.50W
08/27/2020                   CLARION            PA   SOCIAL MEDIA

            REPORT OF DOWNED BRANCES AND LIGHT ROOF DAMAGE NEAR
            SLIGO. POWER OUTAGES ALSO REPORTED NEAR RIMERSBURG.

0527 PM     TSTM WND DMG     FALLS CREEK             41.14N  78.81W
08/27/2020                   JEFFERSON          PA   SOCIAL MEDIA

            REPORT OF DOWNED TREES IN FALLS CREEK. TIME ESTIMATED
            BASED ON RADAR.

0610 PM     TSTM WND DMG     NEW KENSINGTON          40.57N  79.75W
08/27/2020                   WESTMORELAND       PA   SOCIAL MEDIA

            ADDITIONAL REPORT OF NUMEROUS TREES DOWN AND POWER
            OUTAGES IN NEW KENSINGTON.

0628 PM     TSTM WND DMG     PEKIN                   40.71N  81.13W
08/27/2020                   CARROLL            OH   DEPT OF HIGHWAYS

            SR183 CLOSED NEAR MINERVA DUE TO DOWNED POWER LINES.
            TIME ESTIMATED BASED ON RADAR.

0634 PM     TSTM WND DMG     2 SSW PATTERSONVILLE    40.65N  81.06W
08/27/2020                   CARROLL            OH   DEPT OF HIGHWAYS

            SR9 CLOSED NORTH OF CARROLLTON DUE TO DOWNED POWER
            LINES. TIME ESTIMATED BASED ON RADAR.

&&

EVENT NUMBER PBZ2001314
EVENT NUMBER PBZ2001315
EVENT NUMBER PBZ2001316
EVENT NUMBER PBZ2001317
EVENT NUMBER PBZ2001318
EVENT NUMBER PBZ2001319

JF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
853 AM EDT FRI AUG 28 2020

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

0550 PM     TSTM WND DMG     1 WSW SIGNAL            40.79N  80.68W
08/27/2020                   COLUMBIANA         OH   DEPT OF HIGHWAYS

            COUNTY ROAD 154 CLOSED DUE TO DOWNED TREES. TIME
            ESTIMATED BASED ON RADAR.

&&

EVENT NUMBER PBZ2001320

JF