Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 113, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Aug 16, 2026, 7:17 PM EDT for Clarion County, Jefferson County, Pennsylvania. It was in force for 3 hr. 3 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
- Aug 16, 2026, 7:17 PM EDT (23:17 UTC)
- Expired
- Aug 16, 2026, 10:15 PM EDT
- In force
- 3 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Clarion County, PA, Jefferson County, PA
The radar
The State College radar (KCCX), 83 km from the middle of the area, began a volume at 23:20 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 |
|---|---|---|---|
| Aug 16, 7:42 PM EDT | FLASH FLOOD | 2 Ese Brookville, PA | Reports of roadway flooding along US322 near Sulgar Rd. |
| Aug 16, 8:00 PM EDT | FLASH FLOOD | 5 Wnw Reynoldsville, PA | Report of a flooded roadway along US322 near the intersection with Fuller Rd. |
| Aug 16, 8:37 PM EDT | RAIN 2.31 | Brookville, PA | two inches came in the last two hours. 24 hour rainfall total. |
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 25 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 (KPIT), launched 12:00Z, 11.3 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
- 51 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 636 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
191
WGUS51 KPBZ 162317
FFWPBZ
PAC031-065-170215-
/O.NEW.KPBZ.FF.W.0113.260816T2317Z-260817T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
717 PM EDT Sun Aug 16 2026
The National Weather Service in Pittsburgh has issued a
* Flash Flood Warning for...
East Central Clarion County in west central Pennsylvania...
Central Jefferson PA County in west central Pennsylvania...
* Until 1015 PM EDT.
* At 717 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to 0.5 inches of rain have
fallen. The expected rainfall rate is 1 to 2 inches in 1 hour.
Additional rainfall amounts of 1 to 3 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Brookville, Reynoldsville, Sykesville, Falls Creek, Summerville,
Corsica and Knox-Dale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4105 7923 4125 7922 4124 7874 4123 7874
4123 7871 4120 7871 4120 7877 4113 7880
4100 7880 4104 7921 4105 7921
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
AK2 follow-up statements
515
WGUS71 KPBZ 170004
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
804 PM EDT Sun Aug 16 2026
PAC031-065-170215-
/O.CON.KPBZ.FF.W.0113.000000T0000Z-260817T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clarion PA-Jefferson PA-
804 PM EDT Sun Aug 16 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT THIS
EVENING FOR EAST CENTRAL CLARION AND CENTRAL JEFFERSON PA COUNTIES...
At 804 PM EDT, local law enforcement reported flooded roadways along
US322 near Brookville. Between 0.5 and 1.5 inches of rain have
fallen. The expected rainfall rate is 1 inch in 1 hour. Additional
rainfall amounts up to 1 inch are possible in the warned area. Flash
flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Brookville, Reynoldsville, Sykesville, Falls Creek, Summerville,
Corsica and Knox-Dale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4105 7923 4125 7922 4124 7874 4123 7874
4123 7871 4120 7871 4120 7877 4113 7880
4100 7880 4104 7921 4105 7921
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...1 INCH IN 1 HOUR
$$
AK633
WGUS71 KPBZ 170206
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
1006 PM EDT Sun Aug 16 2026
PAC031-065-170216-
/O.EXP.KPBZ.FF.W.0113.000000T0000Z-260817T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clarion PA-Jefferson PA-
1006 PM EDT Sun Aug 16 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 1015 PM EDT THIS EVENING FOR
EAST CENTRAL CLARION AND CENTRAL JEFFERSON PA COUNTIES...
The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
&&
LAT...LON 4105 7923 4125 7922 4124 7874 4123 7874
4123 7871 4120 7871 4120 7877 4113 7880
4100 7880 4104 7921 4105 7921
$$
AKWhat 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 Aug 16, 12:50 PM EDT, 6 hours 27 minutes earlier. Its key messages:
- 1)Severe weather and flash flooding risks continue this afternoon and evening with renewed thunderstorm development. 2) After lingering showers dissipate Monday, there is fairly high confidence in dry weather until Wednesday/Thursday, when the next front arrives.
Area forecast discussion, Aug 16, 12:50 PM EDT, 6 hours 27 minutes before
Area Forecast Discussion
National Weather Service Pittsburgh PA
1250 PM EDT Sun Aug 16 2026
.WHAT HAS CHANGED...
There is higher confidence in the potential for severe
thunderstorms this afternoon, given clearing skies to the west
allowing for increased instability. Beyond this evening, little
change was made to the forecast.
&&
.KEY MESSAGES...
1)Severe weather and flash flooding risks continue this
afternoon and evening with renewed thunderstorm development.
2) After lingering showers dissipate Monday, there is fairly
high confidence in dry weather until Wednesday/Thursday, when
the next front arrives.
&&
.DISCUSSION...
KEY MESSAGE 1...
The region remains in a relative lull of activity between
overnight/early morning activity and developing convection to
the west, where a couple of Severe Thunderstorm Warnings are
already in effect. The new activity is associated with a vort
max/MCV over northwest Ohio. Ahead of this, a good deal of
sunshine is allowing for a buildup of instability, and the HREF
suggests that 1500-2500 J/kg of surface-based CAPE is likely by
18Z, mainly south of I-80. Other convective parameters look best
from I-80 on south, roughly matching with the SPC Slight Risk
area. In particular, a pocket of 25-30 knots of 0-6km shear is
most likely in this region, supporting multicells with mainly a
damaging gust potential where cold pools help consolidate into
short lines. Lengthening low-level hodographs and sufficient
0-1km SRH continue to suggest a low-end tornado threat for any
ESE-moving storms.
Along with this the threat of flash flooding will continue to be
monitored, especially in areas that got heavier rain overnight.
This includes areas in eastern Ohio south of I-70, as well as a
strip extending from New Philadelphia ENE towards Butler County.
Although storms should be fairly progressive overall, the
environment remains highly supportive for efficient rainfall
production. The 12Z KPIT sounding recorded a precipitable water
measurement of 2.15 inches, which is the 9th-highest recorded
at the site since 1952. 2+ inch values remain in place through
this evening, along with 11k to 13k warm-cloud depths. The Flood
Watch will be maintained through tonight.
KEY MESSAGE 2...
Most of the convection should pull off to the east by 02Z-03Z,
although a few showers/storms may linger behind the main line as
another shortwave trough crosses in the mid-level zonal flow.
One last ripple in that flow crosses on Monday, leading to
showers and storms mainly south of Pittsburgh. Convective
parameters are unfavorable for severe weather with this
activity. Also, declining precipitable water values point to a
decreasing risk for heavy rainfall. The Flood Watch expires at 8
AM Monday, and an extension may not be needed.
High pressure building in from the Great Lakes should end
precipitation by Mon evening. Dry weather is then favored until
Wednesday, when the next front could potentially arrive,
although this timing could change. At this time, severe weather
and flooding risks appear low with this system, as supported by
longer-range machine learning guidance.
&&
.AVIATION /18Z SUNDAY THROUGH FRIDAY/...
Mainly MVFR cigs continue this afternoon ahead of an approaching
prefrontal trough. A broken line of thunderstorms is expected to
track east across the region this afternoon and evening along
the prefrontal trough, with IFR restrictions. Some storms could
contain damaging wind and heavy rainfall. Included a tempo
mention in the tafs for the most likely time of arrival. Expect
a gradual deterioration back to IFR tonight with low level
moisture in place.
The surface cold front is progged to track across the region
Monday. Expect a gradual improvement in cig heights through the
day with mixing and some dry advection after FROPA. Airports
from near PIT and south could see a few afternoon showers or a
thunderstorm as this front crosses.
Outlook...
Other than early morning fog, VFR is then expected through
early Wednesday under high pressure. Restriction and
shower/thunderstorm chances return Wednesday and Wednesday night
with the approach and passage of a cold front. VFR returns
Thursday and Friday under high pressure.
&&
.PBZ WATCHES/WARNINGS/ADVISORIES...
PA...Flood Watch through Monday morning for PAZ020-021-029-031-
073>076.
OH...Flood Watch through Monday morning for OHZ039>041-048>050-
057>059-068-069.
WV...Flood Watch through Monday morning for WVZ001>004-012-021-
509>514.
&&
DISCUSSION...CL
AVIATION...WMHazardous weather outlook, Aug 16, 6:11 PM EDT, 1 hour 6 minutes before
Hazardous Weather Outlook National Weather Service Pittsburgh PA 611 PM EDT Sun Aug 16 2026 OHZ039>041-048>050-057>059-068-069-PAZ020-021-029-031-073>076- WVZ001>004-012-021-509>514-172215- Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH- Muskingum-Guernsey-Belmont-Noble-Monroe-Beaver-Allegheny-Washington- Greene-Westmoreland-Higher Elevations of Westmoreland-Fayette- Higher Elevations of Fayette-Hancock-Brooke-Ohio-Marshall-Wetzel- Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- Eastern Preston-Western Tucker-Eastern Tucker- 611 PM EDT Sun Aug 16 2026 ...FLOOD WATCH IN EFFECT THROUGH MONDAY MORNING... This Hazardous Weather Outlook is for east central Ohio, southwest Pennsylvania, western Pennsylvania, and northern West Virginia. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flood Watch. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flood Watch. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ007>009-013>016-022-077-078-172215- Mercer-Venango-Forest-Lawrence-Butler-Clarion-Jefferson PA-Armstrong- Indiana-Higher Elevations of Indiana- 611 PM EDT Sun Aug 16 2026 This Hazardous Weather Outlook is for western Pennsylvania. .DAY ONE...Tonight. There is still some potential for isolated instances of heavy rainfall through the night with additional thunderstorms, along with a few strong wind gusts. .DAYS TWO THROUGH SEVEN...Monday through Saturday. A few showers and thunderstorms could produce some heavy rainfall on Monday morning. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures.
In the hours before
Local storm report, Aug 16, 6:03 PM EDT, 1 hour 14 minutes before
Preliminary Local Storm Report
National Weather Service Pittsburgh PA
603 PM EDT Sun Aug 16 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0259 PM Tstm Wnd Dmg Cadiz 40.27N 80.99W
08/16/2026 Harrison OH Public
Branches down.
&&
KramarLocal storm report, Aug 16, 6:17 PM EDT, 1 hour before
Preliminary Local Storm Report
National Weather Service Pittsburgh PA
617 PM EDT Sun Aug 16 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0359 PM Tstm Wnd Dmg 3 SSE Lower Burrell 40.54N 79.68W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
0408 PM Tstm Wnd Dmg 2 WSW Municipality of M 40.43N 79.68W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
0410 PM Tstm Wnd Dmg 3 SSW Delmont 40.38N 79.59W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
0414 PM Tstm Wnd Dmg East Vandergrift 40.60N 79.57W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
0415 PM Tstm Wnd Dmg 1 E Jeannette 40.33N 79.59W
08/16/2026 Westmoreland PA 911 Call Center
down wires.
0416 PM Tstm Wnd Dmg 1 SSE Madison 40.23N 79.67W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
0418 PM Tstm Wnd Dmg 3 W Hunker 40.20N 79.67W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
0419 PM Tstm Wnd Dmg 2 NW Calumet-Norvelt 40.22N 79.52W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
0422 PM Tstm Wnd Dmg 2 NNW New Alexandria 40.42N 79.43W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
0423 PM Tstm Wnd Dmg 2 NNE New Alexandria 40.43N 79.41W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
0423 PM Tstm Wnd Dmg 2 NNW New Alexandria 40.42N 79.43W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
0427 PM Tstm Wnd Dmg 1 NE Youngstown 40.29N 79.36W
08/16/2026 Westmoreland PA 911 Call Center
down trees.
&&
98Local storm report, Aug 16, 6:19 PM EDT, 58 minutes before
Preliminary Local Storm Report
National Weather Service Pittsburgh PA
619 PM EDT Sun Aug 16 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0341 PM Tstm Wnd Dmg 2 WNW Reserve Township 40.49N 80.02W
08/16/2026 Allegheny PA Public
large limbs down on Perrysville ave.
&&
98Local storm report, Aug 16, 6:53 PM EDT, 24 minutes before
Preliminary Local Storm Report
National Weather Service Pittsburgh PA
653 PM EDT Sun Aug 16 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0433 PM Tstm Wnd Dmg 3 ENE Brandonville 39.68N 79.57W
08/16/2026 Preston WV 911 Call Center
down trees.
&&
98Local storm report, Aug 16, 6:55 PM EDT, 22 minutes before
Preliminary Local Storm Report
National Weather Service Pittsburgh PA
655 PM EDT Sun Aug 16 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0435 PM Tstm Wnd Dmg 8 ESE Fairchance 39.77N 79.63W
08/16/2026 Fayette PA 911 Call Center
trees down.
&&
98Local storm report, Aug 16, 6:59 PM EDT, 18 minutes before
Preliminary Local Storm Report
National Weather Service Pittsburgh PA
659 PM EDT Sun Aug 16 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0659 PM Flash Flood 4 WNW Kennerdell 41.30N 79.91W
08/16/2026 Venango PA 911 Call Center
OLD ROUTE 8 FLOODING FROM TWIN OAKS RD S
DOWN TO THE TWP BUILDINGFLOOD.
&&
98The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 2:30 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence, Washington | 45 min |
| Aug 16, 3:00 PM EDT | Tornado Warning | PBZ | Beaver | 18 min |
| Aug 16, 3:05 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Lawrence, Washington | 40 min |
| Aug 16, 3:22 PM EDT | Tornado Warning | PBZ | Beaver, Butler | 23 min |
| Aug 16, 3:25 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 50 min |
| Aug 16, 3:41 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Beaver, Butler, Lawrence, Westmoreland | 49 min |
| Aug 16, 4:05 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene | 40 min |
| Aug 16, 4:15 PM EDT | Flash Flood Warning | PBZ | Washington | 5 hr |
| Aug 16, 4:15 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Indiana, Westmoreland | 45 min |
| Aug 16, 4:34 PM EDT | Tornado Warning | PBZ | Indiana, Westmoreland | 26 min |
| Aug 16, 4:40 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 20 min |
| Aug 16, 4:44 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 16 min |
| Aug 16, 6:39 PM EDT | Flash Flood Warning | PBZ | Clarion, Venango | 5 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2026Every flash flood warning in 2026
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.