Flash Flood Warning 52, NWS Pittsburgh, PA

687 
WGUS71 KPBZ 240149
FFSPBZ

Flash Flood Statement
National Weather Service Pittsburgh PA
949 PM EDT SUN JUL 23 2017

PAC005-019-240330-
/O.CON.KPBZ.FF.W.0052.000000T0000Z-170724T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Butler PA-Armstrong PA-
949 PM EDT SUN JUL 23 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT FOR
NORTHEASTERN BUTLER AND NORTHWESTERN ARMSTRONG COUNTIES...

At 947 PM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Up to three inches of rain have already 
fallen and additional heavy rain is expected through midnight. 

Flash flooding has been reported in the area just west of Foxburg.

Some locations that will experience flooding include...
Parker, Eau Claire, West Sunbury and Cherry Valley. 

This includes  Interstate 80 in Pennsylvania near mile marker 44.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

&&

LAT...LON 4117 7969 4116 7968 4114 7969 4113 7968
      4110 7968 4098 7988 4105 7999 4117 7981

$$

tax

041 
WGUS71 KPBZ 240331
FFSPBZ

Flash Flood Statement
National Weather Service Pittsburgh PA
1131 PM EDT SUN JUL 23 2017

PAC005-019-240338-
/O.EXP.KPBZ.FF.W.0052.000000T0000Z-170724T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Butler PA-Armstrong PA-
1131 PM EDT SUN JUL 23 2017

...THE FLASH FLOOD WARNING FOR NORTHEASTERN BUTLER AND NORTHWESTERN
ARMSTRONG COUNTIES WILL EXPIRE AT 1130 PM EDT...

The heavy rain has ended across northeastern Butler county and 
shifted further south in the county. While flooding is no longer 
expected to pose a threat across northeastern Butler, the southern 
half of the county will need to be monitored for potential flooding 
through at least midnight.

Please continue to heed any remaining road closures.

LAT...LON 4117 7969 4116 7968 4114 7969 4113 7968
      4110 7968 4098 7988 4105 7999 4117 7981

$$

Area Forecast Discussion
National Weather Service Pittsburgh PA
736 PM EDT Sun Jul 23 2017

.SYNOPSIS...
A stagnant mid-level trough will keep very humid conditions over
the region through Monday with a continued threat for showers
and thunderstorms. Dry conditions are expected through early
Thursday before a cold front approaches from the northwest.

&&

.NEAR TERM /UNTIL 6 AM MONDAY MORNING/...
Ascent via the right entrance region of an upper level jet is
working with a couple of convergent low level regions to allow
for convective development this evening. One of these is sagging
southeastward from NW Ohio, and a second one is developing in
what was actually a far less conducive area from central Ohio to
northern WV. The second area is of particular importance this
evening as a mesolow has shown its hand in eastern OH and adding
additional impetus for ascent and convective development. It now
seems quite likely that convection will overspread the southern
half of the area over the next few hours, generally in line with
the HRRR projections. Due to the trajectory of the storms, it
would seem flooding may be a greater threat than severe weather
at this time, and this will be monitored going forward.

The strongest instability is still present over the northern
reaches of the CWA, however satellite imagery indicates cumulus
is really having difficulty getting going in our area even as it
develops readily farther north. Additionally, convective blow
off has overspread the area, minimizing late afternoon heating,
and thus lessening instability a touch. That said, some
additional development does seem likely here, and likely PoPs
were maintained for later this evening.

The activity over NW Ohio should also make its way southeastward
toward our area, however given previous activity over the area,
it will again just be a rainfall threat. That said, likely PoPs
were maintained through the post-midnight hours.

Behind the final line of convection, some nominal clearing seems
possible overnight given a fall off in layer RH values. Should
that occur, fog development will be almost a foregone
conclusion. Fries

&&

.SHORT TERM /6 AM MONDAY MORNING THROUGH WEDNESDAY/...
Mid level trough sweeps through Monday afternoon so this will
be the last round of showers/storms before a welcome break
occurs.

Upper level heights will rise on Tuesday, and a broad surface
high will build into the Great Lakes. This will finally bring a
stretch of dry weather and sunshine for Tues/Wed.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
A deep upper trough and associated surface cold front will
settle south from Ontario on Thursday, bringing the threat for
showers/storms during the afternoon and evening.

Forecast for Friday into the weekend gets a bit muddy. If the
aforementioned wave progresses into the Southeast, then the
weekend is shaping up to be spectacular with dry conditions and
highs around 80. Some model solutions open the upper wave up
across the Appalachians keeping the threat for clouds and
precipitation (especially over the eastern ridges) into Friday
and perhaps Saturday.

&&

.AVIATION /00Z MONDAY THROUGH FRIDAY/...
Showers and thunderstorms will continue to stream through the
area overnight as an upper-level disturbance swings through.
This could lead to visibility reduction with heavy rain in the
short term.

After the showers/thunderstorms move off to the east, deterioration
back to MVFR and possibly IFR is expected. A mix of morning
stratus and fog is expected over much of the area, with fog
favored in the clearing further west.

Expecting improvement to VFR through Monday morning. The very
slow moving boundary will sag south through Monday, re-
invigorating showers and thunderstorms in the afternoon, mainly
south of Pittsburgh.

.OUTLOOK...
VFR is expected to prevail toward midweek as high pressure
builds in.

&&

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

&&

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
753 PM EDT Sun Jul 23 2017

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ013>016-020>023-029-031-
073>076-WVZ001>004-012-021-509>514-250000-
Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson-
Muskingum-Guernsey-Belmont-Noble-Monroe-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-
753 PM EDT Sun Jul 23 2017

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

.DAY ONE...Tonight.

Slow-moving showers and thunderstorms will bring heavy rainfall. Some
localized flooding will be possible.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PAZ007>009-250000-
Mercer-Venango-Forest-
753 PM EDT Sun Jul 23 2017

This Hazardous Weather Outlook is for northwest Pennsylvania.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
725 PM EDT SUN JUL 23 2017

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

0627 PM     TSTM WND DMG     1 SE OPEKISKA           39.55N  80.04W
07/22/2017                   MONONGALIA         WV   TRAINED SPOTTER

            TREES DOWN ALONG OPEKISKA RIDGE RD AND I-79

&&

EVENT NUMBER PBZ1701807

FRIES

Special Weather Statement
National Weather Service Pittsburgh PA
806 PM EDT SUN JUL 23 2017

PAZ020-029-WVZ001-002-240030-
Beaver-Washington-Brooke-Hancock-
806 PM EDT SUN JUL 23 2017

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND AND HEAVY
RAIN WILL AFFECT NORTHWESTERN WASHINGTON...SOUTHERN BEAVER...
NORTHEASTERN BROOKE AND SOUTHEASTERN HANCOCK COUNTIES...

At 806 PM EDT, a strong thunderstorm was located near Weirton, moving
southeast at 20 mph.

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

Locations impacted include...
Weirton...                        Burgettstown...
Hickory...                        Frankfort Springs...
Atlasburg...                      Slovan...
Sun Valley...                     Midway...
Langeloth...

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

LAT...LON 4044 8059 4049 8040 4034 8021 4027 8045
TIME...MOT...LOC 0006Z 319DEG 16KT 4045 8050

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
812 PM EDT SUN JUL 23 2017

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

0745 PM     FLASH FLOOD      NEW PHILADELPHIA        40.49N  81.44W
07/23/2017                   TUSCARAWAS         OH   LAW ENFORCEMENT

            MAJOR STREET AND ROAD FLOODING IN YORK... WARREN AND
            GOSHEN TOWNSHIPS

&&

EVENT NUMBER PBZ1701808

RCC