Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 31, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Aug 25, 2021, 5:21 PM EDT for Beaver County, Pennsylvania. It was in force for 29 min. 1 report 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, 5:21 PM EDT (21:21 UTC)
- Expired
- Aug 25, 2021, 5:50 PM EDT
- In force
- 29 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
County Beaver County, PA
The radar
The Pittsburgh radar (KPBZ), 14 km from the middle of the area, began a volume at 21:22 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, 5:45 PM EDT | FLASH FLOOD | 1 Ssw Lovi, PA | CREEK OUT OF ITS BANKS AND FLOODING PORTIONS OF PARKHILL ROAD. PICTURE PROVIDED. |
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, 9.4 hours before the alert went out and 28 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.
359
WGUS51 KPBZ 252121
FFWPBZ
PAC007-252315-
/O.NEW.KPBZ.FF.W.0031.210825T2121Z-210825T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pittsburgh PA
521 PM EDT Wed Aug 25 2021
The National Weather Service in Pittsburgh has issued a
* Flash Flood Warning for...
East Central Beaver County in western Pennsylvania...
* Until 715 PM EDT.
* At 521 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2.5 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...
Franklin Park, Economy, Ambridge, Baden, Harmony Township and
Conway.
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 4071 8015 4061 8015 4061 8018 4060 8023
4071 8023
FLASH FLOOD...RADAR INDICATED
$$2 follow-up statements
128
WGUS71 KPBZ 252131
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
531 PM EDT Wed Aug 25 2021
PAC007-252315-
/O.CON.KPBZ.FF.W.0031.000000T0000Z-210825T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Beaver PA-
531 PM EDT Wed Aug 25 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM EDT THIS
EVENING FOR EAST CENTRAL BEAVER COUNTY...
At 531 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 2.5 inches of rain have
fallen. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Franklin Park, Economy, Ambridge, Baden, Harmony Township and
Conway.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4071 8015 4061 8015 4061 8018 4060 8023
4071 8023
FLASH FLOOD...RADAR INDICATED
$$666
WGUS71 KPBZ 252150
FFSPBZ
Flash Flood Statement
National Weather Service Pittsburgh PA
550 PM EDT Wed Aug 25 2021
PAC007-252200-
/O.CAN.KPBZ.FF.W.0031.000000T0000Z-210825T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Beaver PA-
550 PM EDT Wed Aug 25 2021
...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL BEAVER COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4071 8015 4061 8015 4061 8018 4060 8023
4071 8023
$$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, 5:25 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, 5:56 PM EDT | Flash Flood Warning | PBZ | Butler | 89 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.