Severe Thunderstorm Warning 192, NWS Pittsburgh, PA

308 
WWUS51 KPBZ 211945
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
345 PM EDT MON AUG 21 2017

PAC063-212030-
/O.CON.KPBZ.SV.W.0192.000000T0000Z-170821T2030Z/
Indiana PA-
345 PM EDT MON AUG 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHERN INDIANA COUNTY...

At 344 PM EDT, a severe thunderstorm was located near Indiana, moving
east at 15 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar. 

IMPACT...Expect damage to trees and power lines, resulting in some 
         power outages. 

Locations impacted include...
Indiana...                        Homer City...
Clymer...                         Chevy Chase Heights...
Ernest...                         Vintondale...
Creekside...                      Armagh...
Lucerne Mines...                  Jacksonville...
Brush Vly...                      Yellow Creek State Park...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to an interior room on the lowest floor of a building.

Please report severe weather by calling 412-262-1988, posting to 
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH. 

&&

LAT...LON 4050 7891 4041 7897 4057 7933 4069 7923
      4064 7884
TIME...MOT...LOC 1944Z 286DEG 14KT 4059 7922 

HAIL...<.75IN
WIND...60MPH
 
$$

CL

609 
WWUS51 KPBZ 212003
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
403 PM EDT MON AUG 21 2017

PAC063-212013-
/O.CAN.KPBZ.SV.W.0192.000000T0000Z-170821T2030Z/
Indiana PA-
403 PM EDT MON AUG 21 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN INDIANA COUNTY IS
CANCELLED...
                
The storm that prompted the warning has weakened below severe limits
and no longer pose an immediate threat to life and property.
Therefore, the warning has been cancelled.

LAT...LON 4050 7891 4041 7897 4057 7933 4069 7923
      4064 7884
TIME...MOT...LOC 2000Z 286DEG 14KT 4057 7913 

$$

CL

Area Forecast Discussion...UPDATED
National Weather Service Pittsburgh PA
116 PM EDT Mon Aug 21 2017

.SYNOPSIS...
A sequence of weak upper-level disturbances will provide
isolated showers and thunderstorms today. Widespread showers
and thunderstorms are expected on Tuesday as a cold front
crosses the region.

&&

.NEAR TERM /THROUGH TONIGHT/...
Convection from this morning that took advantage of the modest
instability noted in the 12Z sounding has subsided as the low-
amplitude trough that supported it continues to move ewd.
Shortwave ridging will spell a brief erosion of convective
cloud cover, though cirrus may still provide at least a partial
obscuration of the sky during peak eclipse viewing.

A second, weak shortwave trough over central OH will advance
ewd this afternoon and may provide a second round of modest
convection as low-level warm advection weakens the H7 inversion.
Lacking any focused sfc boundary, broad PoPs were employed in
the forecast this afternoon along the diffuse warm front.

Any showers and storms will weaken this evening with loss of
heating, and some clearing is expected in the wake of the
associated shortwave trough.

&&

.SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
A strong upper low will dig into the Great Lakes on Tue and
acquire a neutral to negative tilt through the day in concert
with the movement of a mid-level jet maximum. The system's
associated cold front will approach the Ohio Valley during the
early evening, but a prefrontal trough is expected to be the
focus for daytime convection in the area.

Abundant low-level moisture, steepening lapse rates and strong
effective bulk shear will support the development of strong to
severe thunderstorms by early afternoon along the sharpening sfc
trough. CAPE on the order of 2000 J/kg and effective shear of
40-50kt will promote organized, severe convection.

Given the deep-layer shear orientation roughly parallel to the
sfc feature, storms should congeal quickly into an intense
convective line that will move sewd into the instability axis.
Damaging wind gusts will be the primary threat, but hail also is
possible in more intense, cellular updrafts ahead of the line.

Storms will exit sewd by early evening with rain lingering into
the evening behind the storms as the cold front traverses the
region. High pressure will build in on Wed/Wed eve, with little
chance of rain as dry air invades.

&&

.LONG TERM /THURSDAY THROUGH SUNDAY/...
Broad surface high pressure under an ern-CONUS trough is
progged to support a dry and cooler-than-average air mass
through the period.

&&

.AVIATION /17Z MONDAY THROUGH FRIDAY/...
General VFR is expected for the period although a crossing
shortwave may spawn isold to sct convection. Expect rapid
deterioration of conditions on Tuesday as widespread precip will
herald the advance of cold front.

.Outlook...
With passage of an early Wed cold front, general VFR can be
expected for the remainder of the week.

&&

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

&&

Update...Kramar

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
301 AM EDT Mon Aug 21 2017

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021-509>514-220715-
Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson-
Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest-
Lawrence-Butler-Clarion-Beaver-Allegheny-Armstrong-Indiana-
Washington-Greene-Westmoreland-Westmoreland Ridges-Fayette-
Fayette Ridges-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
301 AM EDT Mon Aug 21 2017

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

.DAY ONE...Today and Tonight.

Hazardous weather is not expected at this time.

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

Scattered severe thunderstorms are possible Tuesday afternoon and
evening, with the primary threat being damaging winds.

.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
314 PM EDT MON AUG 21 2017

PAZ022-023-211945-
Armstrong-Indiana-
314 PM EDT MON AUG 21 2017

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY
WIND WILL AFFECT SOUTHWESTERN INDIANA AND SOUTHEASTERN ARMSTRONG
COUNTIES...

At 314 PM EDT, a strong thunderstorm was located 10 miles east of
Vandergrift, moving southeast at 10 mph.

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

Locations impacted include...
Indiana...                        Homer City...
Black Lick...                     West Lebanon...
Chevy Chase Heights...            Ernest...
Elderton...                       Creekside...
Shelocta...                       Lucerne Mines...
Jacksonville...

LAT...LON 4057 7950 4074 7941 4070 7907 4045 7919
TIME...MOT...LOC 1914Z 292DEG 10KT 4063 7937

CL