Alert archive / Pennsylvania / Flash Flood Warnings in 2017
Flash Flood Warning 9, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at May 28, 2017, 4:56 PM EDT for Forest County, Venango County, Pennsylvania. It was in force for 94 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 28, 2017, 4:56 PM EDT (20:56 UTC)
- Expired
- May 28, 2017, 6:30 PM EDT
- In force
- 94 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Forest County, PA, Venango County, PA
The radar
The Pittsburgh radar (KPBZ), 116 km from the middle of the area, began a volume at 20:58 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 28, 5:55 PM EDT | FLASH FLOOD | 3 E Cooperstown, PA | ROADS CLOSED DUE TO FLASH FLOODING ON ROUTES 427 AND 428 |
| May 28, 5:55 PM EDT | FLASH FLOOD | 3 W Cooperstown, PA | PARTS OF ROUTE 322 CLOSED NEAR THE MERCER/VENANGO/CRAWFORD COUNTY AREA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this flash flood warning; the first came 59 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Pittsburgh, PA (KAGC), launched 12:00Z, 8.9 hours before the alert went out and 126 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 948 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
204
WGUS51 KPBZ 282056
FFWPBZ
PAC053-121-282230-
/O.NEW.KPBZ.FF.W.0009.170528T2056Z-170528T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
456 PM EDT SUN MAY 28 2017
The National Weather Service in Pittsburgh has issued a
* Flash Flood Warning for...
Northern Venango County in northwestern Pennsylvania...
Northwestern Forest County in northwestern Pennsylvania...
* Until 630 PM EDT.
* At 455 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to one inch of rain has
already fallen. Flash flooding is expected to begin shortly.
* Some locations that will experience flooding include...
Oil City, Franklin, Sugarcreek, Hasson Heights, Seneca, Polk,
Rouseville, Cooperstown, Woodland Heights, Pleasantville, Utica and
Oil Creek State Park.
Additional rainfall of up to one inch is possible in the warned area.
Please report flooding by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.
LAT...LON 4142 7946 4135 8000 4150 7999 4151 7996
4160 7985 4160 7983 4162 7983 4162 7947
$$
343 follow-up statements
523
WGUS71 KPBZ 282126
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
526 PM EDT SUN MAY 28 2017
PAC053-121-282230-
/O.CON.KPBZ.FF.W.0009.000000T0000Z-170528T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Venango PA-Forest PA-
526 PM EDT SUN MAY 28 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR
NORTHERN VENANGO AND NORTHWESTERN FOREST COUNTIES...
At 525 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. One to two inches of rain have already
fallen.
Some locations that may experience flooding include...
Oil City, Franklin, Sugarcreek, Hasson Heights, Seneca, Polk,
Rouseville, Cooperstown, Woodland Heights, Pleasantville, Utica and
Oil Creek State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4142 7946 4135 8000 4150 7999 4151 7996
4160 7985 4160 7983 4162 7983 4162 7947
$$685
WGUS71 KPBZ 282159
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
559 PM EDT SUN MAY 28 2017
PAC053-121-282230-
/O.CON.KPBZ.FF.W.0009.000000T0000Z-170528T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Venango PA-Forest PA-
559 PM EDT SUN MAY 28 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR
NORTHERN VENANGO AND NORTHWESTERN FOREST COUNTIES...
At 555 PM EDT, heavy rain had tapered off over the warning area.
However, runoff from the one to two inches of rain will continue for
several hours. More showers and storms can be expected through the
night.
Some locations that may experience flooding include...
Oil City, Franklin, Sugarcreek, Hasson Heights, Seneca, Polk,
Rouseville, Cooperstown, Woodland Heights, Pleasantville, Utica and
Oil Creek State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Please report flooding to your local law enforcement agency when you
can do so safely.
&&
LAT...LON 4142 7946 4135 8000 4150 7999 4151 7996
4160 7985 4160 7983 4162 7983 4162 7947
$$280
WGUS71 KPBZ 282227
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
627 PM EDT SUN MAY 28 2017
PAC053-121-282235-
/O.EXP.KPBZ.FF.W.0009.000000T0000Z-170528T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Venango PA-Forest PA-
627 PM EDT SUN MAY 28 2017
...THE FLASH FLOOD WARNING FOR NORTHERN VENANGO AND NORTHWESTERN
FOREST COUNTIES WILL EXPIRE AT 630 PM EDT...
The heavy rain has tapered off and flood waters has begun to recede
so the flash flood warning will be allowed to expire. However, more
showers and storms can be expected through the night.
Please continue to heed any remaining road closures.
LAT...LON 4142 7946 4135 8000 4150 7999 4151 7996
4160 7985 4160 7983 4162 7983 4162 7947
$$What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pittsburgh, PA wrote its last area forecast discussion before this flash flood warning went out at May 28, 2:44 PM EDT, 2 hours 12 minutes earlier.
Area forecast discussion, May 28, 2:44 PM EDT, 2 hours 12 minutes before
Area Forecast Discussion
National Weather Service Pittsburgh PA
244 PM EDT Sun May 28 2017
.SYNOPSIS...
Showers and thunderstorms are expected through tonight with low
pressure and a crossing front. Weak high pressure will keep Memorial
Day mostly dry with seasonable temperatures.
&&
.NEAR TERM /THROUGH TONIGHT/...
Some mainly scattered showers and storms have formed ahead of
the advancing warm front across SW PA and down into the WV/MD
ridges. Hi-res models have been consistent in continuing this
development, as well as forming additional storms in generally
uncapped warm sector. Highest PoPs initially will remain
generally east of a PIT/MGW line along the warm front. Slow
storm movement still may produce heavy rain totals, especially
along the ridges where storms could become tied to the terrain,
so the Flash Flood Watch will continue. A few scattered severe
storms remain possible as well, as deeper shear tries to move in
from the southwest in tandem with instability.
Cold frontal passage occurs between roughly 04Z and 12Z, with
another round of showers and a few storms accompanying it. At
this time, do not expect this rainfall to exacerbate any late
afternoon/evening flooding, but this will still need to be
monitored. Only a few isolated showers will remain along the
ridges by sunrise. Temperatures remain above seasonal levels
tonight.
&&
.SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/...
After lingering showers exit early, mostly dry weather is
expected on Monday as high pressure arrives. A shortwave will
skim the region to our north Monday night and Tuesday, bringing
another front across the region that should provide some
scattered showers. Held off on thunder for Tuesday for now as
models disagree on stability, however steepening lapse rates may
allow for it. Precipitation coverage will wane behind the
boundary Tuesday night. Fairly seasonable temperatures are
expected.
&&
.LONG TERM /TUESDAY THROUGH SATURDAY/...
The Great Lakes/northeast CONUS trough will remain through the
end of the week, with periodic shower chances from shortwaves
moving through the flow. By next weekend, the upper pattern
becomes more zonal, and a frontal boundary could stall out
somewhere near or in our region. This boundary could provide
more focused rainfall chances, but its placement remains in
question. Temperatures will remain near or just a few degrees
below normal.
&&
.AVIATION /18Z SUNDAY THROUGH FRIDAY/...
As of 17Z, isolated MVFR ceilings remain, but should scatter
out quickly. Afternoon thunderstorms should develop and remain
over eastern portions of the forecast area. While this should
generally keep conditions dry at ZZV and probably HLG, all other
terminals will have the potential for thunderstorms. Did not
have enough confidence in exactly where axis of precipitation
will develop to go with prevailing TSRA at this time.
As thunderstorms decrease in coverage this evening, a cold
front will move in from the west, bringing a round of
precipitation to all sites and a shift in wind direction from
southerly to westerly. While VFR conditions are expected
through the first half of the TAF period outside of any
showers/thunderstorms, widespread MVFR/IFR conditions should
develop for a few hours behind the front around sunrise.
However, by mid morning ceilings should scatter out, yielding a
return to VFR conditions.
.Outlook...
Restrictions are possible Tue/Wed with an upper trough.
&&
.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...Flash Flood Watch until 10 PM EDT this evening for MDZ001.
OH...None.
PA...Flash Flood Watch until 10 PM EDT this evening for PAZ021-029-
031-073>076.
WV...Flash Flood Watch until 10 PM EDT this evening for WVZ021-
509>514.
&&Hazardous weather outlook, May 28, 11:21 AM EDT, 5 hours 35 minutes before
Hazardous Weather Outlook National Weather Service Pittsburgh PA 1121 AM EDT Sun May 28 2017 MDZ001-PAZ021-029-031-073>076-WVZ021-509>514-291530- Garrett-Allegheny-Washington-Greene-Westmoreland-Westmoreland Ridges- Fayette-Fayette Ridges-Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- Eastern Preston-Western Tucker-Eastern Tucker- 1121 AM EDT Sun May 28 2017 ...FLASH FLOOD WATCH IN EFFECT UNTIL 10 PM EDT THIS EVENING... This Hazardous Weather Outlook is for western Maryland, southwest Pennsylvania and northern West Virginia. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. Also, a few thunderstorms could become severe during the afternoon and evening, with large hail and damaging wind gusts as the primary threats. .DAYS TWO THROUGH SEVEN...Monday through Saturday. 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. OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020-022-023- WVZ001>004-012-291530- Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson-Muskingum- Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest-Lawrence-Butler- Clarion-Beaver-Armstrong-Indiana-Hancock-Brooke-Ohio-Marshall-Wetzel- 1121 AM EDT Sun May 28 2017 This Hazardous Weather Outlook is for east central Ohio, northwest Pennsylvania, west central Pennsylvania, western Pennsylvania, northern West Virginia and northern panhandle of West Virginia. .DAY ONE...This Afternoon and Tonight. A few thunderstorms could become severe during the afternoon and evening, with large hail and damaging wind gusts as the primary threats. .DAYS TWO THROUGH SEVEN...Monday through Saturday. 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.
In the hours before
Special weather statement, May 28, 3:49 PM EDT, 1 hour 7 minutes before
Special Weather Statement National Weather Service Pittsburgh PA 349 PM EDT SUN MAY 28 2017 PAZ007-008-282015- Venango-Mercer- 349 PM EDT SUN MAY 28 2017 ...A STRONG THUNDERSTORM CAPABLE OF PRODUCING HAIL AND GUSTY WIND WILL AFFECT EAST CENTRAL MERCER AND SOUTHWESTERN VENANGO COUNTIES... At 349 PM EDT, a strong thunderstorm was located 10 miles southwest of Sugarcreek, or 10 miles southwest of Franklin, moving northeast at 15 mph. Wind gusts up to 55 mph and hail up to the size of nickels are possible with this storm. Locations impacted include... Franklin... Sugarcreek... Seneca... Polk... Kennerdell... Utica... Cranberry Township... This storm may intensify, so monitor local radio or television stations for additional information and possible warnings from the National Weather Service. LAT...LON 4121 7994 4129 8005 4152 7994 4137 7969 TIME...MOT...LOC 1949Z 219DEG 12KT 4129 7997
Local storm report, May 28, 4:09 PM EDT, 47 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
409 PM EDT SUN MAY 28 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0404 PM HAIL KNOX 41.23N 79.54W
05/28/2017 E0.75 INCH CLARION PA TRAINED SPOTTER
&&
EVENT NUMBER PBZ1701494
24Local storm report, May 28, 4:40 PM EDT, 16 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
440 PM EDT SUN MAY 28 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0434 PM HAIL 2 W NICKLEVILLE 41.27N 79.68W
05/28/2017 M1.75 INCH VENANGO PA TRAINED SPOTTER
&&
EVENT NUMBER PBZ1701495
24The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 11:11 AM EDT | Flash Flood Watch | PBZ | Allegheny, Fayette, Greene, Washington, Westmoreland | 8 hr |
| May 28, 3:49 PM EDT | Special Weather Statement | PBZ | Venango | 26 min |
| May 28, 3:54 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer, Venango | 36 min |
| May 28, 4:01 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Venango | 44 min |
| May 28, 4:12 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 33 min |
| May 28, 4:45 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion | 30 min |
| May 28, 4:46 PM EDT | Flash Flood Warning | PBZ | Clarion | 119 min |
| May 28, 4:49 PM EDT | Tornado Warning | PBZ | Clarion | 26 min |
| May 28, 6:40 PM EDT | Areal Flood Warning | PBZ | Clarion | 3 hr |
| May 28, 7:34 PM EDT | Areal Flood Warning | PBZ | Venango | 3 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2017Every flash flood warning in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.