Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 33, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Aug 25, 2021, 5:56 PM EDT for Butler County, Pennsylvania. It was in force for 89 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
- Aug 25, 2021, 5:56 PM EDT (21:56 UTC)
- Expired
- Aug 25, 2021, 7:25 PM EDT
- In force
- 89 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
County Butler County, PA
The radar
The Pittsburgh radar (KPBZ), 63 km from the middle of the area, began a volume at 21:59 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 25, 6:02 PM EDT | FLASH FLOOD | Sherwin, PA | HALL ROAD NEAR THE RAILROAD TRACKS WAS CLOSED DUE TO HIGH WATER. |
| Aug 25, 6:14 PM EDT | FLASH FLOOD | 2 E Smithville, PA | FLOODING IN THE VICINITY OF 1056 MAHOOD ROAD |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 9.9 hours before the alert went out and 71 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
- 323 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1166 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- -18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
166
WGUS51 KPBZ 252156
FFWPBZ
PAC019-260000-
/O.NEW.KPBZ.FF.W.0033.210825T2156Z-210826T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
556 PM EDT Wed Aug 25 2021
The National Weather Service in Pittsburgh has issued a
* Flash Flood Warning for...
Northeastern Butler County in west central Pennsylvania...
* Until 800 PM EDT.
* At 556 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
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...
Chicora, Bruin, Eau Claire, Petrolia, Karns City, Fairview, West
Sunbury, Hooker and Boyers.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4095 7997 4115 7998 4113 7970 4095 7970
FLASH FLOOD...RADAR INDICATED
$$2 follow-up statements
098
WGUS71 KPBZ 252200
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
600 PM EDT Wed Aug 25 2021
PAC019-260000-
/O.CON.KPBZ.FF.W.0033.000000T0000Z-210826T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Butler PA-
600 PM EDT Wed Aug 25 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING
FOR NORTHEASTERN BUTLER COUNTY...
At 600 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 3 inches of rain have
fallen. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Chicora, Bruin, Eau Claire, Petrolia, Karns City, Fairview, West
Sunbury, Hooker and Boyers.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4095 7997 4115 7998 4113 7970 4095 7970
FLASH FLOOD...RADAR INDICATED
$$858 WGUS71 KPBZ 252325 FFSPBZ Flash Flood Statement National Weather Service Pittsburgh PA 725 PM EDT Wed Aug 25 2021 PAC019-252335- /O.CAN.KPBZ.FF.W.0033.000000T0000Z-210826T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Butler PA- 725 PM EDT Wed Aug 25 2021 ...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN BUTLER COUNTY... 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 4095 7997 4115 7998 4113 7970 4095 7970 $$
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 3:12 PM EDT | Special Weather Statement | PBZ | Mercer | 33 min |
| Aug 25, 3:34 PM EDT | Areal Flood Advisory | PBZ | Mercer | 116 min |
| Aug 25, 3:43 PM EDT | Special Weather Statement | PBZ | Allegheny | 32 min |
| Aug 25, 4:12 PM EDT | Special Weather Statement | PBZ | Butler | 18 min |
| Aug 25, 4:46 PM EDT | Special Weather Statement | PBZ | Beaver | 14 min |
| Aug 25, 4:50 PM EDT | Areal Flood Advisory | PBZ | Allegheny, Butler | 27 min |
| Aug 25, 5:17 PM EDT | Flash Flood Warning | PBZ | Allegheny, Butler | 88 min |
| Aug 25, 5:20 PM EDT | Special Weather Statement | PBZ | Butler | 10 min |
| Aug 25, 5:21 PM EDT | Flash Flood Warning | PBZ | Beaver | 29 min |
| Aug 25, 5:25 PM EDT | Areal Flood Advisory | PBZ | Butler | 27 min |
| Aug 25, 5:29 PM EDT | Areal Flood Advisory | PBZ | Allegheny, Washington | 37 min |
| Aug 25, 5:35 PM EDT | Special Weather Statement | PBZ | Butler | 25 min |
| Aug 25, 5:52 PM EDT | Flash Flood Warning | PBZ | Butler | 74 min |
| Aug 25, 6:05 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington | 46 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2021Every flash flood warning in 2021
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.