Special Weather Statement, NWS Pittsburgh, PA

Area Forecast Discussion
National Weather Service Pittsburgh PA
754 PM EDT Sat Jun 19 2021

.SYNOPSIS...
Periodic shower and thunderstorm chance will continue through Monday
followed by dry conditions through at least midweek.

&&

.NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...
Changes for the eve update included some downward POP adjustments
based on radar trends, high res mdl solns, and ewd shortwave
progress.

Despite decent deep layer shear, convection has not generated beyond
some scattered activity n of Pit. Forcing for ascent with the
shortwave is sliding eastward and instability did not recover after
the days cloud cover.

Remaining convective activity should wane this evening as the
shortwave shifts east and instability further decreases; however,
the chance for some iso/sct showers and maybe some storms will
continue overnight, mainly for southern portions of the area as a
weak convergence area develops. With no significant regime change,
overnight low temperatures will remain warm.

&&

.SHORT TERM /6 AM SUNDAY MORNING THROUGH MONDAY NIGHT/...
Weak ridging will build across the region on Sunday, which should
limit afternoon convection, but kept mention of isolated
showers/storms to account for embedded shortwaves with healthy
dewpoint and seasonable aftn warmth.

Monday is likely to be another severe threat day with warmth and
humidity in advance of a deepening upper trough and associated front.
Cold frontal passage will eventually end rain chances late Monday
night or early Tuesday.

&&

.LONG TERM /TUESDAY THROUGH SATURDAY/...
Dry weather is expected to return by midweek as sfc high pressure
builds across the region. Cooler temperatures are expected behind the
front on Tuesday, with a gradual warming trend through the week. Rain
chances will return on Friday with crossing low pressure.

&&

.AVIATION /00Z SUNDAY THROUGH THURSDAY/...
Further condition deterioration is expected tonight as sct convection
dvlps with another approaching shrtwv, mainly to the south of PIT.
Otherwise, expect areas of IFR and MVFR st and fog where rain fell
and near the convergence areas south of PIT.

Improvement is expected as Sunday morning progresses.

.Outlook...
Convection and restrictions are likely into early Tuesday with the
approach and passage of a cold front.

&&

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

&&

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
914 PM EDT Sat Jun 19 2021

OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-029-
031-073>076-WVZ001>004-012-021-509>514-210115-
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-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
914 PM EDT Sat Jun 19 2021

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...Tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.
Scattered incidents of damageing wind are expected with the approach
and passage of a Monday cold front.

.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
1030 PM EDT Sat Jun 19 2021

PAZ014-020-021-200300-
Butler-Beaver-Allegheny-
1030 PM EDT Sat Jun 19 2021

...AN AREA OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING SMALL HAIL
AND GUSTY WIND WILL AFFECT NORTHEASTERN BEAVER...SOUTHWESTERN BUTLER
AND NORTH CENTRAL ALLEGHENY COUNTIES...

At 1030 PM EDT, strong thunderstorms were clustered over Rochester,
or over Monaca, moving southeast at 25 mph.

Wind gusts up to 45 mph and small hail are possible with this storm.

Locations impacted include...
McCandless Township...            Cranberry...
Franklin Park...                  Aliquippa...
Beaver Falls...                   Monaca...
Hampton Township...               Economy...
Ellwood City...                   Wexford...
New Brighton...                   Beaver...

This includes the following highways...
  Pennsylvania Turnpike between mile markers 14 and 43.
  Interstate 79 in Pennsylvania between mile markers 70 and 92.
  Interstate 376 in Pennsylvania between mile markers 31 and 35.

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

LAT...LON 4071 7975 4058 7985 4060 7997 4054 8009
      4073 8041 4085 8028 4085 8016 4087 8014
TIME...MOT...LOC 0230Z 308DEG 21KT 4072 8026

RACKLEY

Special Weather Statement
National Weather Service Pittsburgh PA
1100 PM EDT Sat Jun 19 2021

PAZ014-021-022-073-200330-
Armstrong-Butler-Westmoreland-Allegheny-
1100 PM EDT Sat Jun 19 2021

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY
WIND WILL AFFECT SOUTHERN BUTLER...NORTHEASTERN ALLEGHENY...
NORTHWESTERN WESTMORELAND AND SOUTHWESTERN ARMSTRONG COUNTIES...

At 1059 PM EDT, a strong thunderstorm was located over Mars, or near
Cranberry, moving southeast at 20 mph.

Wind gusts up to 45 mph and small hail are possible with this storm.

Locations impacted include...
McCandless Township...            Cranberry...
Vandergrift...                    Plum...
Murrysville...                    Hampton Township...
New Kensington...                 Lower Burrell...
Harrison Township...              Economy...
Wexford...                        Arnold...

This includes the following highways...
  Pennsylvania Turnpike between mile markers 27 and 48.
  Interstate 79 in Pennsylvania between mile markers 75 and 82.

Frequent cloud to ground lightning is occurring with this storm. Seek
safe shelter inside a building or vehicle.

LAT...LON 4047 7964 4064 8015 4066 8015 4081 8005
      4071 7952
TIME...MOT...LOC 0259Z 296DEG 19KT 4069 8001

RACKLEY

Special Weather Statement
National Weather Service Pittsburgh PA
1107 PM EDT Sat Jun 19 2021

PAZ007-200330-
Mercer-
1107 PM EDT Sat Jun 19 2021

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND WILL AFFECT
MERCER COUNTY...

At 1107 PM EDT, a strong thunderstorm was located over Kinsman, or 15
miles north of Sharpsville, moving southeast at 30 mph.

Wind gusts up to 45 mph are possible with this storm.

Locations impacted include...
Hermitage...                      Sharon...
Sharpsville...                    Greenville...
Farrell...                        Stoneboro...
West Middlesex...                 Sandy Lake...
Clark...                          Wheatland...
Jamestown...                      Fredonia...

This includes the following highways...
  Interstate 79 in Pennsylvania between mile markers 125 and 137.
  Interstate 80 in Pennsylvania between mile markers 3 and 10.

Frequent cloud to ground lightning is occurring with this storm. Seek
safe shelter inside a building or vehicle.

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

LAT...LON 4148 8016 4149 8000 4141 8000 4113 8040
      4113 8042 4122 8052 4149 8052
TIME...MOT...LOC 0307Z 315DEG 25KT 4146 8059

RACKLEY

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