Flash Flood Warning 22, NWS Pittsburgh, PA

071 
WGUS51 KPBZ 281854
FFWPBZ
PAC003-129-282230-
/O.EXT.KPBZ.FF.W.0022.000000T0000Z-200828T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
254 PM EDT Fri Aug 28 2020

The National Weather Service in Pittsburgh has extended the

* Flash Flood Warning for...
  Southern Allegheny County in southwestern Pennsylvania...
  West central Westmoreland County in southwestern Pennsylvania...

* Until 630 PM EDT.

* At 251 PM EDT, Radar continued to show moderate to heavy rain over 
  southern Allegheny and west central Westmoreland counties where 
  between one and two inches have already fallen and local law 
  enforcement has reported numerous flooded roadways already this 
  afternoon. Flash flooding is already occurring.

  HAZARD...Flash flooding.

  SOURCE...Law enforcement.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that will experience flooding include...
  Pittsburgh, Mount Lebanon, Bethel Park, McKeesport, West Mifflin,
  Baldwin, Upper St. Clair, Scott Township, Whitehall, South Park
  Township, Munhall and Cecil-Bishop.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Please report flooding to your local law enforcement agency when you
can do so safely.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

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

&&

LAT...LON 4024 7967 4027 7997 4033 8018 4036 8022
      4038 8018 4038 7967

FLASH FLOOD...OBSERVED

$$

722 
WGUS71 KPBZ 282225
FFSPBZ

Flash Flood Statement
National Weather Service Pittsburgh PA
625 PM EDT Fri Aug 28 2020

PAC003-129-282235-
/O.EXP.KPBZ.FF.W.0022.000000T0000Z-200828T2230Z/
Allegheny PA-Westmoreland PA-
625 PM EDT Fri Aug 28 2020

...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM EDT THIS EVENING FOR 
SOUTHERN ALLEGHENY AND WEST CENTRAL WESTMORELAND COUNTIES...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 4024 7967 4027 7997 4033 8018 4036 8022
      4038 8018 4038 7967

$$

DS

Area Forecast Discussion
National Weather Service Pittsburgh PA
945 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
shortwave amid increasing deep tropical moisture with the remnants
of Laura. Isolated severe storms are possible with large hail and
damaging winds being the primary threat. Flash flooding is also a
concern with training storms and all the ingredients in place for
very efficient precipitation production...especially at locations
received heavy rain on Thursday.

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 /14Z FRIDAY THROUGH TUESDAY/...

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.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1127 AM EDT FRI AUG 28 2020

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

0944 AM     TSTM WND DMG     CLINTONVILLE            41.20N  79.88W
08/28/2020                   VENANGO            PA   911 CALL CENTER

            TREES REPORTED DOWN ALONG RTE 308 NEAR TOWN.

&&

EVENT NUMBER PBZ2001326

Special Weather Statement
National Weather Service Pittsburgh PA
1135 AM EDT Fri Aug 28 2020

PAZ015-016-022-281600-
Armstrong-Jefferson-Clarion-
1135 AM EDT Fri Aug 28 2020

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND AND HEAVY
RAIN WILL AFFECT SOUTHWESTERN JEFFERSON...EAST CENTRAL ARMSTRONG AND
SOUTHEASTERN CLARION COUNTIES...

At 1135 AM EDT, a strong thunderstorm was located near Rimersburg,
moving east at 40 mph.

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

Locations impacted include...
Clarion...                        Brookville...
Knox...                           Rimersburg...
New Bethlehem...                  Sligo...
Strattanville...                  Summerville...
Limestone...                      Hawthorn...
Corsica...                        Callensburg...

This includes Interstate 80 in Pennsylvania between mile markers 52
and 80.

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

LAT...LON 4095 7957 4123 7957 4124 7925 4112 7893
      4102 7893 4098 7910 4090 7945
TIME...MOT...LOC 1535Z 279DEG 39KT 4105 7944

Special Weather Statement
National Weather Service Pittsburgh PA
1142 AM EDT Fri Aug 28 2020

OHZ041-281630-
Columbiana-
1142 AM EDT Fri Aug 28 2020

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY
WIND WILL AFFECT COLUMBIANA COUNTY...

At 1141 AM EDT, a strong thunderstorm was located near Sebring, or 7
miles southwest of Salem, moving east at 20 mph.

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

Locations impacted include...
Salem...                          Columbiana...
East Palestine...                 Lisbon...
Leetonia...                       New Waterford...
Hanoverton...                     Rogers...
North Georgetown...               Negley...
Homeworth...                      Guilford Lake State Park...

LAT...LON 4090 8082 4090 8052 4072 8053 4076 8109
      4090 8109 4090 8090 4093 8089 4093 8082
TIME...MOT...LOC 1541Z 268DEG 21KT 4086 8099

Special Weather Statement
National Weather Service Pittsburgh PA
1200 PM EDT Fri Aug 28 2020

PAZ021-029-073-281630-
Westmoreland-Washington-Allegheny-
1200 PM EDT Fri Aug 28 2020

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY
WIND WILL AFFECT EAST CENTRAL WASHINGTON...SOUTHEASTERN ALLEGHENY AND
WEST CENTRAL WESTMORELAND COUNTIES...

At 1159 AM EDT, a strong thunderstorm was located over Pleasant
Hills, or near McKeesport, moving east at 25 mph.

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

Locations impacted include...
Pittsburgh...                     Mount Lebanon...
Bethel Park...                    Monroeville...
McMurray...                       McKeesport...
Gastonville...                    West Mifflin...
Baldwin...                        Upper St. Clair...
Scott Township...                 Whitehall...

This includes Interstate 79 in Pennsylvania between mile markers 55
and 56.

LAT...LON 4027 8009 4038 8012 4041 7998 4040 7973
      4025 7975 4023 7993
TIME...MOT...LOC 1559Z 268DEG 20KT 4033 7994

Special Weather Statement
National Weather Service Pittsburgh PA
1203 PM EDT Fri Aug 28 2020

PAZ016-022-023-073-281645-
Armstrong-Jefferson-Westmoreland-Indiana-
1203 PM EDT Fri Aug 28 2020

...A LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING SMALL HAIL AND
GUSTY WIND WILL AFFECT INDIANA...SOUTHEASTERN JEFFERSON...
NORTHEASTERN WESTMORELAND AND SOUTHEASTERN ARMSTRONG COUNTIES...

At 1203 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Punxsutawney to 10 miles southeast
of Ford City. Movement was east at 50 mph.

Wind gusts up to 55 mph and small hail are possible with these
storms.

Locations impacted include...
Indiana...                        Punxsutawney...
Homer City...                     Blairsville...
Black Lick...                     Clymer...
Rural Valley...                   West Lebanon...
Big Run...                        Chevy Chase Heights...
Rossiter...                       Ernest...

LAT...LON 4044 7895 4041 7922 4062 7949 4102 7908
      4100 7880 4072 7880
TIME...MOT...LOC 1603Z 276DEG 42KT 4093 7904 4067 7938

Special Weather Statement
National Weather Service Pittsburgh PA
1233 PM EDT Fri Aug 28 2020

OHZ041-PAZ013-020-281715-
Columbiana-Lawrence-Beaver-
1233 PM EDT Fri Aug 28 2020

...STRONG THUNDERSTORMS CAPABLE OF PRODUCING SMALL HAIL...GUSTY WIND
AND HEAVY RAIN WILL AFFECT EASTERN COLUMBIANA...BEAVER AND
SOUTHWESTERN LAWRENCE COUNTIES...

At 1232 PM EDT, a cluster of strong thunderstorms were located near
Calcutta, or 8 miles north of Wellsville, moving east at 30 mph.

Wind gusts up to 55 mph and small hail are possible with these
storms.

Locations impacted include...
East Liverpool...                 Aliquippa...
Beaver Falls...                   Columbiana...
Monaca...                         East Palestine...
Economy...                        Ellwood City...
New Brighton...                   Beaver...
Calcutta...                       Baden...

This includes the following highways...
  Pennsylvania Turnpike between mile markers 8 and 23.
  Interstate 376 in Pennsylvania between mile markers 31 and 42.

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

LAT...LON 4065 8079 4087 8077 4085 8016 4062 8016
TIME...MOT...LOC 1632Z 273DEG 26KT 4072 8067