Flash Flood Warning 24, NWS Pittsburgh, PA

554 
WGUS71 KPBZ 201033
FFSPBZ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
633 AM EDT THU OCT 20 2016

PAC085-201215-
/O.CON.KPBZ.FF.W.0024.000000T0000Z-161020T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MERCER PA-
633 AM EDT THU OCT 20 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 AM EDT FOR
MERCER COUNTY...

AT 632 AM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY
RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE ALREADY
FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE
WARNED AREA.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
  INTERSTATE 79 IN PENNSYLVANIA BETWEEN MILE MARKERS 119 AND 135.
 
  INTERSTATE 80 IN PENNSYLVANIA BETWEEN MILE MARKERS 1 AND 6.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4147 8003 4126 8002 4116 8050 4146 8052

$$

379 
WGUS51 KPBZ 201202
FFWPBZ
PAC085-201415-
/O.EXT.KPBZ.FF.W.0024.000000T0000Z-161020T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
802 AM EDT THU OCT 20 2016

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  MERCER COUNTY IN NORTHWESTERN PENNSYLVANIA...

* UNTIL 1015 AM EDT.

* AT 759 AM EDT...RADAR AND AUTOMATED RAIN GAUGES INDICATE TWO TO
  THREE INCHES OF RAIN HAD FALLEN ACROSS THE WARNED AREA.  FLASH
  FLOODING IS ALREADY OCCURRING AT COLT ROAD NEAR STATE ROUTE 18.

ANOTHER QUARTER TO HALF INCH IF RAINFALL IS POSSIBLE BEFORE SHOWERS
TAPER OFF LATER THIS MORNING.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
  INTERSTATE 79 IN PENNSYLVANIA BETWEEN MILE MARKERS 119 AND 135.
 
  INTERSTATE 80 IN PENNSYLVANIA BETWEEN MILE MARKERS 1 AND 6.
 
PLEASE REPORT FLOODING BY CALLING 412-262-
1988...POSTING TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4147 8003 4126 8002 4116 8050 4146 8052

$$
15

053 
WGUS71 KPBZ 201327
FFSPBZ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
927 AM EDT THU OCT 20 2016

PAC085-201415-
/O.CON.KPBZ.FF.W.0024.000000T0000Z-161020T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MERCER PA-
927 AM EDT THU OCT 20 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 AM EDT FOR
MERCER COUNTY...

AT 924 AM EDT...RADAR SHOWED THAT HEAVY RAIN HAS ENDED FOR THE
WARNED AREA.  HOWEVER, RUNOFF FROM THE TWO TO THREE INCHES OF
RAINFALL EARLY THIS MORNING WILL CONTINUE FOR SEVERAL HOURS.

DO NOT DRIVE THROUGH AREAS WHERE WATER IS FLOWING OVER THE ROAD
AND DO NOT DRIVE AROUND ROAD CLOSURE BARRIERS.

MORE RAIN IS EXPECTED TO DEVELOP BY EVENING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4147 8003 4126 8002 4116 8050 4146 8052

$$
15

655 
WGUS71 KPBZ 201406
FFSPBZ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1006 AM EDT THU OCT 20 2016

PAC085-201415-
/O.EXP.KPBZ.FF.W.0024.000000T0000Z-161020T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MERCER PA-
1006 AM EDT THU OCT 20 2016

...THE FLASH FLOOD WARNING FOR MERCER COUNTY WILL EXPIRE AT 1015 AM
EDT...

THE HEAVY RAIN HAS ENDED FOR NOW AND REMAINING AREAS OF HIGH WATER
WILL CONTINUE TO RECEDE.  PLEASE CONTINUE TO HEED ANY REMAINING ROAD
CLOSURES.

LAT...LON 4147 8003 4126 8002 4116 8050 4146 8052

$$
15

Area Forecast Discussion
National Weather Service Pittsburgh PA
607 AM EDT Thu Oct 20 2016

.SYNOPSIS...
Low pressure and a crossing cold front will bring widespread rain
to the region from late today into Friday. Much cooler weather
will follow for the weekend.

&&

.NEAR TERM /THROUGH TONIGHT/...
Updated for continuing rain and thunderstorms north of I-80. This
activity will continue to lift northward over the next few hours
as the warm sector advances northward a bit. Rest unchanged for
now.

Previous discussion...

The warm front will continue to lift north today as a midlevel
trough continues to dig in the Mississippi Valley...putting a
good portion of the CWA in the warm sector. This will suppress
precipitation across much of the area through at least midday,
while some showers remain possible mainly north and west of
Pittsburgh. As low pressure rides up the Ohio Valley later today
along the advancing cold front, showers and some thunderstorms
will advance across the area mainly after 18Z. Likely and low-end
categorical PoPs reappear by 00Z. Lift and moisture is maximized
tonight with frontal passage and the approach of the still-digging
and negatively-tilting shortwave, leading to near 100 PoPs.

Going to hold off on the issuance of any flood watches for now
until areas of best rainfall can be ascertained later today.
However, amounts will need to be monitored along the
aforementioned heavy rain band from this morning. An additional
one to two inches may be seen in general from late afternoon into
tomorrow morning, and we may not be able to totally rule out
isolated flooding issues.  Will mention in HWO.

Also of concern is marginal risk of severe storms across the
region as outlined by SPC. Increasing speed shear is noted on
model soundings for the afternoon, with 40 knots of flow at 700
mb. Lack of deep instability may be a limiting factor in a more
significant severe threat. Still, isolated strong to even damaging
gusts are a possibility, with large hail a lesser threat. Will
also mention this in HWO.

Increased high temperatures today, especially in the southeast,
with the influence of the warm sector. Readings in the 80s appear
likely here. Little change to lows tonight...mainly in the upper
40s to the mid 50s.

&&

.SHORT TERM /FRIDAY THROUGH SATURDAY/...
The frontal precipitation will drift eastward Friday morning with
additional showers developing behind the boundary in the strong
cold air advection and passage of the upper level trough axis.
Much colder weather will follow for the weekend as the upper
trough develops over the Eastern CONUS. Scattered showers will
remain in the forecast through at least Saturday morning, with
focus shifting to the north and ridge zones, as cold advection
continues and shortwaves in northwest flow traverse the area.
By Saturday afternoon, the much drier air aloft, which will work
to suppress inversion heights, will eventually make it closer to
the surface, bringing and end to any lingering showers. Still
expect to see a good deal of cu over the area Saturday with the
cold pool aloft remaining anchored over the area.

&&

.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
Dry, but seasonably cool conditions will return Sunday as warmer
air slowly works back into the area. Ensemble solutions continue
to push a weak front through the area sometime on Monday, which
may provide another risk for scattered showers. High pressure
builds in for the remainder of the long term.

&&

.AVIATION /10Z THURSDAY THROUGH MONDAY/...
Rain and thunderstorms are currently mainly north of I-80, and are
expected to lift northward over the next few hours as the warm
sector becomes more established. Most terminals will remain VFR
through the morning hours, save for FKL early and possibly DUJ if
a few showers can survive. Winds may gust to between 15 and 20
knots this afternoon from the southwest.

Conditions will deteriorate overnight as numerous showers and a
few thunderstorms develop from west to east. Expect all terminals
to drop through MVFR this evening to IFR tonight, as rain is
expected to be moderate to possibly heavy at times. While
visibility may fluctuate a bit, ceilings will stay at IFR through
12Z, with LIFR possible especially north and west of PIT.

.OUTLOOK /THURSDAY NIGHT THROUGH MONDAY/...
Periodic restrictions are expected through Saturday as low
pressure and subsequent upper troughing cross the area.

&&

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

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
440 AM EDT THU OCT 20 2016

MDZ001-OHZ049-057>059-068-069-PAZ007>009-013-021-023-029-031-073>076-
WVZ002>004-012-021-509>514-210845-
GARRETT-HARRISON-MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-MERCER-
VENANGO-FOREST-LAWRENCE-ALLEGHENY-INDIANA-WASHINGTON-GREENE-
WESTMORELAND-WESTMORELAND RIDGES-FAYETTE-FAYETTE RIDGES-BROOKE-OHIO-
MARSHALL-WETZEL-MARION-MONONGALIA-
RIDGES OF EASTERN MONONGALIA AND NORTHWESTERN PRESTON-PRESTON-
EASTERN PRESTON-WESTERN TUCKER-EASTERN TUCKER-
440 AM EDT THU OCT 20 2016

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.

THERE IS A RISK OF ISOLATED SEVERE THUNDERSTORMS THIS AFTERNOON
AND EVENING. DAMAGING WINDS ARE THE PRIMARY THREAT...WITH LARGE
HAIL ALSO A POSSIBILITY.

ONE TO TWO INCHES OF RAINFALL IS EXPECTED FROM LATE TODAY INTO
FRIDAY MORNING, WITH ISOLATED HIGHER TOTALS. LOCALIZED FLOODING IS
A POSSIBILITY.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THE THREAT OF HEAVY RAIN AND ISOLATED FLOODING MAY CONTINUE INTO
FRIDAY MORNING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

OHZ039>041-048-050-PAZ014>016-020-022-WVZ001-210845-
TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-JEFFERSON-BUTLER-CLARION-
BEAVER-ARMSTRONG-HANCOCK-
440 AM EDT THU OCT 20 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL OHIO...WEST
CENTRAL PENNSYLVANIA...WESTERN PENNSYLVANIA AND NORTHERN WEST
VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

THERE IS A RISK OF ISOLATED SEVERE THUNDERSTORMS THIS AFTERNOON
AND EVENING. DAMAGING WINDS ARE THE PRIMARY THREAT...WITH LARGE
HAIL ALSO A POSSIBILITY.

ONE TO TWO INCHES OF RAINFALL IS EXPECTED FROM LATE TODAY INTO
FRIDAY MORNING, WITH ISOLATED HIGHER TOTALS. LOCALIZED FLOODING IS
A POSSIBILITY. THIS IS PARTICULARLY TRUE IN AREAS THAT RECEIVED
HEAVY RAINFALL LATE WEDNESDAY NIGHT. IF THE THREAT INCREASES...A
FLASH FLOOD WATCH MAY BE NECESSARY.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THE THREAT OF HEAVY RAIN AND ISOLATED FLOODING MAY CONTINUE INTO
FRIDAY MORNING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
211 AM EDT THU OCT 20 2016

PAZ014-020-021-200645-
ALLEGHENY-BUTLER-BEAVER-
211 AM EDT THU OCT 20 2016

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN BEAVER...
SOUTHWESTERN BUTLER AND NORTHERN ALLEGHENY COUNTIES...

AT 210 AM EDT...A STRONG THUNDERSTORM WAS LOCATED OVER ALIQUIPPA...
MOVING EAST AT 40 MPH.

WIND GUSTS UP TO 50 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
PENN HILLS...ROSS TOWNSHIP...MCCANDLESS TOWNSHIP...CRANBERRY...MOON
TOWNSHIP...FRANKLIN PARK...ALIQUIPPA...MONACA...SHALER TOWNSHIP...
PLUM...HAMPTON TOWNSHIP AND ROBINSON TOWNSHIP.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
  PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 22 AND 52.

  INTERSTATE 79 IN PENNSYLVANIA BETWEEN MILE MARKERS 64 AND 83.

  PARKWAY NORTH BETWEEN MILE MARKERS 6 AND 13.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 4051 8038 4069 8040 4084 7980 4049 7977
TIME...MOT...LOC 0610Z 260DEG 36KT 4062 8028

CL

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
236 AM EDT THU OCT 20 2016

PAZ021-029-200715-
ALLEGHENY-WASHINGTON-
236 AM EDT THU OCT 20 2016

...STRONG WIND GUSTS WILL AFFECT CENTRAL WASHINGTON AND SOUTHERN
ALLEGHENY COUNTIES...

AT 233 AM EDT...AN OUTFLOW OF GUSTY WINDS WAS LOCATED OVER NORTH
SIDE PITTSBURGH MOVING SOUTHEAST AT 35 MPH.

WINDS IN EXCESS OF 40 MPH ARE POSSIBLE WITH THIS LINE.

LOCATIONS IMPACTED INCLUDE...
PITTSBURGH...PENN HILLS...MOUNT LEBANON...BETHEL PARK...
MONROEVILLE...MCMURRAY...MCKEESPORT...WASHINGTON...CANONSBURG...
GASTONVILLE...SHALER TOWNSHIP AND PLUM.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
  INTERSTATE 70 IN PENNSYLVANIA BETWEEN MILE MARKERS 7 AND 38.

  PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 53 AND 58.

  INTERSTATE 79 IN PENNSYLVANIA BETWEEN MILE MARKERS 50 AND 61...AND
  BETWEEN MILE MARKERS 27 AND 49.

  PARKWAY NORTH BETWEEN MILE MARKERS 1 AND 4.

LAT...LON 4039 7975 4039 7977 4031 7979 4029 7978
      4028 7980 4026 7979 4024 7981 4023 7979
      4020 7987 4018 7985 4016 7986 4016 7990
      4013 7988 4001 7998 4013 8046 4049 8009
      4049 7970 4043 7970
TIME...MOT...LOC 0633Z 302DEG 32KT 4045 8001