Special Weather Statement, NWS Pittsburgh, PA

Area Forecast Discussion
National Weather Service Pittsburgh PA
753 AM EDT Mon Jun 14 2021

.SYNOPSIS...
Shower and thunderstorms chances are expected again today with a
reinforcing cold front. Another crossing disturbance will maintain
lower shower and thunderstorm chances Tuesday before high pressure
returns dry weather for mid week.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Most of the changes to the grids this morning were mainly cosmetic.
Lingering fog mainly south of Pittsburgh will burn off by mid-
morning, with sunshine areawide into late morning.

Not much has changed regarding the severe thunderstorm outlook. A
quick peek at the ongoing 12Z PIT sounding shows relatively warm air
aloft that will cut back on eventual CAPE as compared to yesterday.
However, with 50-60 knots of deep shear and mid-level dry air, a
severe risk still exists.

Previous discussion...

Added more patchy dense fog, and issued an SPS, for areas generally
near and S of I 70, where sfc obs and satellite indicated low vsbys.
Previous...A lead shortwave in a developing Ern CONUS longwave
trough, and its associated reinforcing sfc cold front, will approach
and cross the region this afternoon and evening. Increasing shower
and thunderstorm chances are expected through the day with the
approach of the wave/front, and jet driven ascent.

Model progged strong 0-6km shear near 60kt, moderate instability
with a sfc based CAPE from 1000-1500 J/KG, and dry (downdraft
enhancing) mid level air, should result in a risk for severe
thunderstorms again today, though expect less coverage than yesterday
with lower CAPE values. SPC has the area outlined in a Marginal
Risk/Isolated coverage for severe storms this afternoon and evening.
The main hazard is expected to be damaging wind, though large hail is
also possible. Will include this potential in the Hazardous Weather
Outlook.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH WEDNESDAY NIGHT/...
Showers and thunderstorms should end from W-E this evening as the
front completes its passage and instability diminishes. Another
shortwave rotating through the main trough should return chances for
showers and a few thunderstorms Tuesday, though coverage should be
more sporadic than Monday with less upper jet support and deep layer
moisture.

The showers should end Tuesday night as sfc high pressure begins to
build under the longwave trough, with dry and cooler than average
weather through mid week.

&&

.LONG TERM /THURSDAY THROUGH SUNDAY/...
Dry weather should continue through most of Friday as the longwave
trough exits the E Coast, and ridging builds across the Upper Ohio
Valley region. A trough is then expected to advance from the Upper
Midwest, with shower and thunderstorm chances returning Friday night
and Saturday as it approaches and crosses the region. Low chances for
showers should continue Sunday, mainly S of PIT, as a srn stream
shortwave approaches the Lower OH/TN Valley region. Temperatures
should average near seasonable levels through the period.

&&

.AVIATION /12Z MONDAY THROUGH FRIDAY/...
Dense fog will linger early in the TAF period for MGW, ZZV, HLG but
should resolve by 14z. VFR is expected throughout much of the day,
until a building cu field this afternoon with thunderstorms that
develop nw of BVI around 18z. These storms will generally move sely
through the early evening hours and could result in damaging wind and
hail at the surface. After rain and storms, terminals will struggle
to improve with plenty of moisture lingering.

.Outlook...
Periodic rain chances from passing shortwaves within a developing
eastern U.S. trough may also create intermittent restrictions through
Tuesday. VFR under high pressure is expected mid-week.

&&

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

&&

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
312 AM EDT Mon Jun 14 2021

OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-029-
031-073>076-WVZ001>004-012-021-509>514-150715-
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-
312 AM EDT Mon Jun 14 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...Today and tonight.

Isolated severe thunderstorms are possible this afternoon and early
evening. The main hazard is expected to be damaging wind, though
large hail is also possible.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
913 AM EDT MON JUN 14 2021

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

0315 PM     TSTM WND DMG     SOUTH ZANESVILLE        39.90N  82.02W
06/13/2021                   MUSKINGUM          OH   EMERGENCY MNGR

            SEVERAL TREES AND POWER LINES DOWN, INCLUDING IN THE
            VICINITY OF FAIR STREET/MAYSVILLE PIKE.

&&

EVENT NUMBER PBZ2101684

CL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
926 AM EDT MON JUN 14 2021

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

0335 PM     TSTM WND DMG     1 SW PLAINFIELD         40.19N  81.74W
06/13/2021                   COSHOCTON          OH   DEPT OF HIGHWAYS

            TREES DOWN IN LINTON TOWNSHIP

&&

EVENT NUMBER PBZ2101685

CL

Special Weather Statement
National Weather Service Pittsburgh PA
1113 AM EDT Mon Jun 14 2021

PAZ007-008-141545-
Venango-Mercer-
1113 AM EDT Mon Jun 14 2021

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING HAIL AND GUSTY WIND
WILL AFFECT NORTHEASTERN MERCER AND VENANGO COUNTIES...

At 1113 AM EDT, a strong thunderstorm was located 7 miles northwest
of Franklin, moving east at 40 mph.

Wind gusts up to 45 mph and hail up to the size of nickels are
possible with this storm.

Locations impacted include...
Oil City...                       Franklin...
Sugarcreek...                     Hasson Heights...
Stoneboro...                      Seneca...
Polk...                           Sandy Lake...
Rouseville...                     Clintonville...
Cooperstown...                    Kennerdell...

This includes the following highways...
  Interstate 79 in Pennsylvania between mile markers 127 and 134.
  Interstate 80 in Pennsylvania between mile markers 31 and 40.

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

Campers should consider seeking sturdy shelter until this storm
passes.

LAT...LON 4145 7952 4144 7952 4144 7948 4141 7948
      4132 7959 4132 7960 4131 7960 4117 7978
      4117 7983 4124 8007 4140 8024 4149 8005
      4149 8000 4150 8000 4150 7998 4151 7998
      4151 7996 4154 7993
TIME...MOT...LOC 1513Z 285DEG 34KT 4144 7997