Special Weather Statement, NWS Pittsburgh, PA

Area Forecast Discussion
National Weather Service Pittsburgh PA
128 PM EDT Wed Jun 30 2021

.SYNOPSIS...
Warm and humid conditions will give way to showers and storms
this afternoon. Cooler weather is expected over the weekend.

&&

.NEAR TERM /THROUGH TONIGHT/...
Current conditions feature the development of showers and
thunderstorms into central and eastern OH as they track east through
the noon and into the afternoon. These cells are now breaking the cap
and tapping into the robust 3000 J/KG aloft. These are organizing as
well with good support aloft. Thus with the remnant boundary to the
north, further development is expected and so a Severe Thunderstorm
Watch has been issued. This will persist into the evening hours.

Nevertheless, have added pops through the afternoon period and into
the overnight as the front will keep convection going into the early
morning hours. Slightly slow storm motions, PWATs in the 1.6 to 1.7
range, and the potential of training due to the orientation of the
front, the threat of flooding is a concern. Will discuss the
potential for a Flash Flood Watch.

Occasional showers and storms will continue into Thursday as a cold
front crosses and the aforementioned upper trough continues to
deepen and pivots over the forecast area. The combination of the
slowing boundary and the west to east orientation combined with the
daytime heating on Thursday will lead to a possible eclipse of FFG in
many locations.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
By Thursday night, the boundary further slides southeast will cooling
temperatures and slightly drier air behind it. Aloft, ridging
attempts to intrude into the area cutting off moisture to the area
from the northwest. However, the pattern aloft yields a bit to a
semi blocking off the Atlantic coast. This keeps the upper low
meandering a bit longer. This will keep showers in place through
midday Friday. Models have had trouble with the exit of the blocking
feature but overall agree on an exit in precip by Friday afternoon
and evening. While a few showers may remain, and overall drying
pattern is likely.

With that said, have gone with slight chance pops in the Friday
night timeframe. With lessening amounts in time.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
Shower remain but lessening chances and cooler temperature continue
Saturday with the upper low over the forecast area...followed by
drier conditions and near normal temperatures on Independence Day as
high pressure builds in from the west. The heat and drier conditions
return in

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
High pressure will maintain VFR until a pre-frontal shortwave prompts
widespread shower and thunderstorm development this
afternoon/evening. Much of the far north terminals and far southeast
terminals are still experiencing VFR. Northwest terminals are seeing
this convection. TEMPO TSRA are included for most ports this in
anticipation. Gusty winds, lightning, and hail are possible with
these thunderstorms.

MVFR/IFR cigs and vis are expected early tomorrow
morning under cold advection.

.Outlook...
Occasional restrictions are expected through Friday as a troughing
pattern results in periodic moist convection.

&&

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

&&

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
1256 PM EDT Wed Jun 30 2021

WVZ511>514-011700-
Preston-Eastern Preston-Western Tucker-Eastern Tucker-
1256 PM EDT Wed Jun 30 2021

This Hazardous Weather Outlook is for northern West Virginia.

.DAY ONE...This afternoon and tonight.

Strong thunderstorms will be possible this afternoon and evening.
Gusty winds will be the main threat. Localized flooding will also be
possible.

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

Excessive rainfall may lead to instances of flooding Thursday and
Thursday night.

.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>009-013>016-020>023-029-
031-073>076-WVZ001>004-012-021-509-510-011700-
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-
Higher Elevations of Westmoreland-Fayette-
Higher Elevations of Fayette-Hancock-Brooke-Ohio-Marshall-Wetzel-
Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-
1256 PM EDT Wed Jun 30 2021

...SEVERE THUNDERSTORM WATCH 326 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

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...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...Thursday through Tuesday.

Excessive rainfall may lead to instances of flooding Thursday and
Thursday night.

.SPOTTER INFORMATION STATEMENT...

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

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
332 PM EDT WED JUN 30 2021

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

0315 PM     FLASH FLOOD      FRANKLIN FARMS          40.15N  80.27W
06/30/2021                   WASHINGTON         PA   911 CALL CENTER

            REPORT OF WASHED OUT ROAD NEAR INTERSECTION OF
            RIDGEWOOD DRIVE AND FRANKLIN FARMS ROAD NEAR CHARTIERS
            CREEK.

&&

EVENT NUMBER PBZ2101856

JF

Special Weather Statement
National Weather Service Pittsburgh PA
335 PM EDT Wed Jun 30 2021

PAZ009-015-302000-
Forest-Clarion-
335 PM EDT Wed Jun 30 2021

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND AND HEAVY
RAIN WILL AFFECT NORTHEASTERN CLARION AND FOREST COUNTIES...

At 334 PM EDT, a strong thunderstorm was located near Tionesta, or 11
miles west of Marienville, moving east at 30 mph.

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

Locations impacted include...
Marienville...                    Tionesta...
Kellettville...                   Starr...

Torrential rainfall also is occurring with this storm and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4144 7896 4144 7897 4145 7898 4145 7906
      4142 7907 4142 7909 4140 7909 4139 7941
      4153 7947 4163 7905 4162 7895
TIME...MOT...LOC 1934Z 256DEG 28KT 4148 7935

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
352 PM EDT WED JUN 30 2021

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

0219 PM     TSTM WND DMG     ELM GROVE               40.05N  80.65W
06/30/2021                   OHIO               WV   SOCIAL MEDIA

            REPORT OF GIANT TREES DOWN AND MUCH OF THE AREA WITHOUT
            POWER. TIME ESTIMATED BASED ON RADAR.

0233 PM     TSTM WND DMG     FRANKLIN                40.27N  80.54W
06/30/2021                   BROOKE             WV   EMERGENCY MNGR

            EM REPORT THAT AN OLD BUILDING BLOWN DOWN FROM STRAIGHT
            LINE WINDS IN BROOKE HILLS PARK. TIME ESTIMATED BASED ON
            RADAR

0234 PM     TSTM WND DMG     FRANKLIN                40.27N  80.54W
06/30/2021                   BROOKE             WV   EMERGENCY MNGR

            EM REPORTED NUMEROUS VERY LARGE TREES DOWN AROUND
            FRANKLIN. TIME ESTIMATED BASED ON RADAR.

0252 PM     TSTM WND DMG     JOSEPHINE               40.48N  79.18W
06/30/2021                   INDIANA            PA   SOCIAL MEDIA

            REPORT SHOWS LARGE TREE BRANCHES DOWN AND POWER
            OUTAGES. TIME ESTIMATED BASED ON RADAR.

0257 PM     FLASH FLOOD      ELM GROVE               40.05N  80.65W
06/30/2021                   OHIO               WV   SOCIAL MEDIA

            REPORT OF FLOODING ON ROADWAYS IN ELM GROVE AREA.

&&

EVENT NUMBER PBZ2101857
EVENT NUMBER PBZ2101858
EVENT NUMBER PBZ2101859
EVENT NUMBER PBZ2101860
EVENT NUMBER PBZ2101861

JF

Special Weather Statement
National Weather Service Pittsburgh PA
352 PM EDT Wed Jun 30 2021

PAZ073>076-302015-
Fayette Ridges-Westmoreland Ridges-Westmoreland-Fayette-
352 PM EDT Wed Jun 30 2021

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND AND HEAVY
RAIN WILL AFFECT SOUTH CENTRAL WESTMORELAND AND FAYETTE COUNTIES...

At 351 PM EDT, a strong thunderstorm was located over Uniontown,
moving east at 35 mph.

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

Locations impacted include...
Uniontown...                      Connellsville...
Scottdale...                      South Connellsville...
Farmington...                     Seven Springs...
Fairchance...                     Dunbar...
Smithfield...                     Everson...
Vanderbilt...                     Dawson...

This includes Pennsylvania Turnpike between mile markers 88 and 99.

Torrential rainfall also is occurring with this storm and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4011 7918 4012 7921 4010 7923 4008 7927
      3990 7940 3985 7942 3982 7937 3979 7936
      3978 7986 4013 7968 4015 7916
TIME...MOT...LOC 1951Z 257DEG 31KT 3992 7968